jacoco-实战篇-增量覆盖率

获取增量覆盖率报告的改动源码的步骤：

第一步：拉取jacoco源码，源码下载地址：点我

第二步：修改org.jacoco.core项目中

　　1、增加项目依赖

　　　　修改pom.xml文件，增加依赖如下：

　　<!--java文件编译class-->
    <dependency>
      <groupId>org.eclipse.jdt</groupId>
      <artifactId>org.eclipse.jdt.core</artifactId>
      <version>3.19.0</version>
    </dependency>

    <!--git操作-->
    <dependency>
      <groupId>org.eclipse.jgit</groupId>
      <artifactId>org.eclipse.jgit</artifactId>
      <version>5.5.0.201909110433-r</version>
    </dependency>

　　2、修改项目中org.jacoco.core.analysis包下的CoverageBuilder类：

　　public static List<ClassInfo> classInfos;    // 新增的成员变量

    /**
     * 分支与master对比
     * @param gitPath local gitPath
     * @param branchName new test branch name
     */
    public CoverageBuilder(String gitPath, String branchName) {
        this.classes = new HashMap<String, IClassCoverage>();
        this.sourcefiles = new HashMap<String, ISourceFileCoverage>();
        classInfos = CodeDiff.diffBranchToBranch(gitPath, branchName,CodeDiff.MASTER);
    }

    /**
     * 分支与分支之间对比
     * @param gitPath local gitPath
     * @param newBranchName newBranchName
     * @param oldBranchName oldBranchName
     */
    public CoverageBuilder(String gitPath, String newBranchName, String oldBranchName) {
        this.classes = new HashMap<String, IClassCoverage>();
        this.sourcefiles = new HashMap<String, ISourceFileCoverage>();
        classInfos = CodeDiff.diffBranchToBranch(gitPath, newBranchName, oldBranchName);
    }

    /**
     * tag与tag之间对比
     * @param gitPath local gitPath
     * @param branchName develop branchName
     * @param newTag new Tag
     * @param oldTag old Tag
     */
    public CoverageBuilder(String gitPath, String branchName, String newTag, String oldTag) {
        this.classes = new HashMap<String, IClassCoverage>();
        this.sourcefiles = new HashMap<String, ISourceFileCoverage>();
        classInfos = CodeDiff.diffTagToTag(gitPath,branchName, newTag, oldTag);
    }

第三步：新增文件

　　在org.jacoco.core项目 org.jacoco.core.internal包下新增diff包(目录)，然后在diff包下新增如下文件：

　　1、新增ASTGenerator类

package org.jacoco.core.internal.diff;

import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.dom.*;
import sun.misc.BASE64Encoder;
import java.io.*;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
 * AST编译java源文件
 */
public class ASTGenerator {
    private String javaText;
    private CompilationUnit compilationUnit;

    public ASTGenerator(String javaText) {
        this.javaText = javaText;
        this.initCompilationUnit();
    }

    /**
     * 获取AST编译单元,首次加载很慢
     */
    private void initCompilationUnit() {
        //  AST编译
        final ASTParser astParser = ASTParser.newParser(8);
        final Map<String, String> options = JavaCore.getOptions();
        JavaCore.setComplianceOptions(JavaCore.VERSION_1_8, options);
        astParser.setCompilerOptions(options);
        astParser.setKind(ASTParser.K_COMPILATION_UNIT);
        astParser.setResolveBindings(true);
        astParser.setBindingsRecovery(true);
        astParser.setStatementsRecovery(true);
        astParser.setSource(javaText.toCharArray());
        compilationUnit = (CompilationUnit) astParser.createAST(null);
    }

    /**
     * 获取java类包名
     */
    public String getPackageName() {
        if (compilationUnit == null) {
            return "";
        }
        PackageDeclaration packageDeclaration = compilationUnit.getPackage();
        if (packageDeclaration == null){
            return "";
        }
        String packageName = packageDeclaration.getName().toString();
        return packageName;
    }

    /**
     * 获取普通类单元
     */
    public TypeDeclaration getJavaClass() {
        if (compilationUnit == null) {
            return null;
        }
        TypeDeclaration typeDeclaration = null;
        final List<?> types = compilationUnit.types();
        for (final Object type : types) {
            if (type instanceof TypeDeclaration) {
                typeDeclaration = (TypeDeclaration) type;
                break;
            }
        }
        return typeDeclaration;
    }

    /**
     * 获取java类中所有方法
     * @return 类中所有方法
     */
    public MethodDeclaration[] getMethods() {
        TypeDeclaration typeDec = getJavaClass();
        if (typeDec == null) {
            return new MethodDeclaration[]{};
        }
        MethodDeclaration[] methodDec = typeDec.getMethods();
        return methodDec;
    }

    /**
     * 获取新增类中的所有方法信息
     */
    public List<MethodInfo> getMethodInfoList() {
        MethodDeclaration[] methodDeclarations = getMethods();
        List<MethodInfo> methodInfoList = new ArrayList<MethodInfo>();
        for (MethodDeclaration method: methodDeclarations) {
            MethodInfo methodInfo = new MethodInfo();
            setMethodInfo(methodInfo, method);
            methodInfoList.add(methodInfo);
        }
        return methodInfoList;
    }

    /**
     * 获取修改类型的类的信息以及其中的所有方法，排除接口类
     */
    public ClassInfo getClassInfo(List<MethodInfo> methodInfos, List<int[]> addLines, List<int[]> delLines) {
        TypeDeclaration typeDec = getJavaClass();
        if (typeDec == null || typeDec.isInterface()) {
            return null;
        }
        ClassInfo classInfo = new ClassInfo();
        classInfo.setClassName(getJavaClass().getName().toString());
        classInfo.setPackages(getPackageName());
        classInfo.setMethodInfos(methodInfos);
        classInfo.setAddLines(addLines);
        classInfo.setDelLines(delLines);
        classInfo.setType("REPLACE");
        return classInfo;
    }

    /**
     * 获取新增类型的类的信息以及其中的所有方法，排除接口类
     */
    public ClassInfo getClassInfo() {
        TypeDeclaration typeDec = getJavaClass();
        if (typeDec == null || typeDec.isInterface()) {
            return null;
        }
        MethodDeclaration[] methodDeclarations = getMethods();
        ClassInfo classInfo = new ClassInfo();
        classInfo.setClassName(getJavaClass().getName().toString());
        classInfo.setPackages(getPackageName());
        classInfo.setType("ADD");
        List<MethodInfo> methodInfoList = new ArrayList<MethodInfo>();
        for (MethodDeclaration method: methodDeclarations) {
            MethodInfo methodInfo = new MethodInfo();
            setMethodInfo(methodInfo, method);
            methodInfoList.add(methodInfo);
        }
        classInfo.setMethodInfos(methodInfoList);
        return classInfo;
    }

    /**
     * 获取修改中的方法
     */
    public MethodInfo getMethodInfo(MethodDeclaration methodDeclaration) {
        MethodInfo methodInfo = new MethodInfo();
        setMethodInfo(methodInfo, methodDeclaration);
        return methodInfo;
    }

    private void setMethodInfo(MethodInfo methodInfo,MethodDeclaration methodDeclaration) {
        methodInfo.setMd5(MD5Encode(methodDeclaration.toString()));
        methodInfo.setMethodName(methodDeclaration.getName().toString());
        methodInfo.setParameters(methodDeclaration.parameters().toString());
    }

    /**
     * 计算方法的MD5的值
     */
    public static String MD5Encode(String s) {
        String MD5String = "";
        try {
            MessageDigest md5 = MessageDigest.getInstance("MD5");
            BASE64Encoder base64en = new BASE64Encoder();
            MD5String = base64en.encode(md5.digest(s.getBytes("utf-8")));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return MD5String;
    }

    /**
     * 判断方法是否存在
     * @param method        新分支的方法
     * @param methodsMap    master分支的方法
     * @return
     */
    public static boolean isMethodExist(final MethodDeclaration method, final Map<String, MethodDeclaration> methodsMap) {
        // 方法名+参数一致才一致
        if (!methodsMap.containsKey(method.getName().toString() + method.parameters().toString())) {
            return false;
        }
        return true;
    }

    /**
     * 判断方法是否一致
     */
    public static boolean isMethodTheSame(final MethodDeclaration method1,final MethodDeclaration method2) {
        if (MD5Encode(method1.toString()).equals(MD5Encode(method2.toString()))) {
            return true;
        }
        return false;
    }
}

　　2、新增ClassInfo类：

package org.jacoco.core.internal.diff;

import java.util.List;

public class ClassInfo {
    /**
     * java文件
     */
    private String classFile;
    /**
     * 类名
     */
    private String className;
    /**
     * 包名
     */
    private String packages;

    /**
     * 类中的方法
     */
    private List<MethodInfo> methodInfos;

    /**
     * 新增的行数
     */
    private List<int[]> addLines;

    /**
     * 删除的行数
     */
    private List<int[]> delLines;

    /**
     * 修改类型
     */
    private String type;

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public List<int[]> getAddLines() {
        return addLines;
    }

    public void setAddLines(List<int[]> addLines) {
        this.addLines = addLines;
    }

    public List<int[]> getDelLines() {
        return delLines;
    }

    public void setDelLines(List<int[]> delLines) {
        this.delLines = delLines;
    }

    public String getClassFile() {
        return classFile;
    }

    public void setClassFile(String classFile) {
        this.classFile = classFile;
    }

    public String getClassName() {
        return className;
    }

    public void setClassName(String className) {
        this.className = className;
    }

    public String getPackages() {
        return packages;
    }

    public void setPackages(String packages) {
        this.packages = packages;
    }

    public List<MethodInfo> getMethodInfos() {
        return methodInfos;
    }

    public void setMethodInfos(List<MethodInfo> methodInfos) {
        this.methodInfos = methodInfos;
    }
}

　　3、新增CodeDiff类：

package org.jacoco.core.internal.diff;

import org.eclipse.jdt.core.dom.MethodDeclaration;
import org.eclipse.jgit.api.Git;
import org.eclipse.jgit.diff.*;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectReader;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.patch.FileHeader;
import org.eclipse.jgit.treewalk.AbstractTreeIterator;
import org.eclipse.jgit.treewalk.CanonicalTreeParser;
import org.eclipse.jgit.util.StringUtils;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.*;

/**
 * 代码版本比较
 */
public class CodeDiff {
    public final static String REF_HEADS = "refs/heads/";
    public final static  String MASTER = "master";

    /**
     * 分支和分支之间的比较
     * @param gitPath           git路径
     * @param newBranchName     新分支名称
     * @param oldBranchName     旧分支名称
     * @return
     */
    public static List<ClassInfo> diffBranchToBranch(String gitPath, String newBranchName, String oldBranchName) {
        List<ClassInfo> classInfos = diffMethods(gitPath, newBranchName, oldBranchName);
        return classInfos;
    }
    private static List<ClassInfo> diffMethods(String gitPath, String newBranchName, String oldBranchName) {
        try {
            //  获取本地分支
            GitAdapter gitAdapter = new GitAdapter(gitPath);
            Git git = gitAdapter.getGit();
            Ref localBranchRef = gitAdapter.getRepository().exactRef(REF_HEADS + newBranchName);
            Ref localMasterRef = gitAdapter.getRepository().exactRef(REF_HEADS + oldBranchName);
            //  更新本地分支
            gitAdapter.checkOutAndPull(localMasterRef, oldBranchName);
            gitAdapter.checkOutAndPull(localBranchRef, newBranchName);
            //  获取分支信息
            AbstractTreeIterator newTreeParser = gitAdapter.prepareTreeParser(localBranchRef);
            AbstractTreeIterator oldTreeParser = gitAdapter.prepareTreeParser(localMasterRef);
            //  对比差异
            List<DiffEntry> diffs = git.diff().setOldTree(oldTreeParser).setNewTree(newTreeParser).setShowNameAndStatusOnly(true).call();
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            DiffFormatter df = new DiffFormatter(out);
            //设置比较器为忽略空白字符对比（Ignores all whitespace）
            df.setDiffComparator(RawTextComparator.WS_IGNORE_ALL);
            df.setRepository(git.getRepository());
            List<ClassInfo> allClassInfos = batchPrepareDiffMethod(gitAdapter, newBranchName, oldBranchName, df, diffs);
            return allClassInfos;
        }catch (Exception e) {
            e.printStackTrace();
        }
        return  new ArrayList<ClassInfo>();
    }

    /**
     * 单分支Tag版本之间的比较
     * @param gitPath    本地git代码仓库路径
     * @param newTag     新Tag版本
     * @param oldTag     旧Tag版本
     * @return
     */
    public static List<ClassInfo> diffTagToTag(String gitPath, String branchName, String newTag, String oldTag) {
        if(StringUtils.isEmptyOrNull(gitPath) || StringUtils.isEmptyOrNull(branchName)  || StringUtils.isEmptyOrNull(newTag)  || StringUtils.isEmptyOrNull(oldTag) ){
            throw new IllegalArgumentException("Parameter(local gitPath,develop branchName,new Tag,old Tag) can't be empty or null !");
        }else if(newTag.equals(oldTag)){
            throw new IllegalArgumentException("Parameter new Tag and old Tag can't be the same");
        }
        File gitPathDir = new File(gitPath);
        if(!gitPathDir.exists()){
            throw new IllegalArgumentException("Parameter local gitPath is not exit !");
        }

        List<ClassInfo> classInfos = diffTagMethods(gitPath,branchName, newTag, oldTag);
        return classInfos;
    }
    private static List<ClassInfo> diffTagMethods(String gitPath,String branchName, String newTag, String oldTag) {
        try {
            //  init local repository
            GitAdapter gitAdapter = new GitAdapter(gitPath);
            Git git = gitAdapter.getGit();
            Repository repo =  gitAdapter.getRepository();
            Ref localBranchRef = repo.exactRef(REF_HEADS + branchName);

            //  update local repository
            gitAdapter.checkOutAndPull(localBranchRef, branchName);

            ObjectId head = repo.resolve(newTag+"^{tree}");
            ObjectId previousHead = repo.resolve(oldTag+"^{tree}");

            // Instanciate a reader to read the data from the Git database
            ObjectReader reader = repo.newObjectReader();
            // Create the tree iterator for each commit
            CanonicalTreeParser oldTreeIter = new CanonicalTreeParser();
            oldTreeIter.reset(reader, previousHead);
            CanonicalTreeParser newTreeIter = new CanonicalTreeParser();
            newTreeIter.reset(reader, head);

            //  对比差异
            List<DiffEntry> diffs = git.diff().setOldTree(oldTreeIter).setNewTree(newTreeIter).setShowNameAndStatusOnly(true).call();
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            DiffFormatter df = new DiffFormatter(out);
            //设置比较器为忽略空白字符对比（Ignores all whitespace）
            df.setDiffComparator(RawTextComparator.WS_IGNORE_ALL);
            df.setRepository(repo);
            List<ClassInfo> allClassInfos = batchPrepareDiffMethodForTag(gitAdapter, newTag,oldTag, df, diffs);
            return allClassInfos;
        }catch (Exception e) {
            e.printStackTrace();
        }
        return  new ArrayList<ClassInfo>();
    }
    /**
     * 多线程执行对比
     */
    private static List<ClassInfo> batchPrepareDiffMethodForTag(final GitAdapter gitAdapter, final String newTag, final String oldTag, final DiffFormatter df, List<DiffEntry> diffs) {
        int threadSize = 100;
        int dataSize = diffs.size();
        int threadNum = dataSize / threadSize + 1;
        boolean special = dataSize % threadSize == 0;
        ExecutorService executorService = Executors.newFixedThreadPool(threadNum);

        List<Callable<List<ClassInfo>>> tasks = new ArrayList<Callable<List<ClassInfo>>>();
        Callable<List<ClassInfo>> task = null;
        List<DiffEntry> cutList = null;
        //  分解每条线程的数据
        for (int i = 0; i < threadNum; i++) {
            if (i == threadNum - 1) {
                if (special) {
                    break;
                }
                cutList = diffs.subList(threadSize * i, dataSize);
            } else {
                cutList = diffs.subList(threadSize * i, threadSize * (i + 1));
            }
            final List<DiffEntry> diffEntryList = cutList;
            task = new Callable<List<ClassInfo>>() {
                public List<ClassInfo> call() throws Exception {
                    List<ClassInfo> allList = new ArrayList<ClassInfo>();
                    for (DiffEntry diffEntry : diffEntryList) {
                        ClassInfo classInfo = prepareDiffMethodForTag(gitAdapter, newTag, oldTag, df, diffEntry);
                        if (classInfo != null) {
                            allList.add(classInfo);
                        }
                    }
                    return allList;
                }
            };
            // 这里提交的任务容器列表和返回的Future列表存在顺序对应的关系
            tasks.add(task);
        }
        List<ClassInfo> allClassInfoList = new ArrayList<ClassInfo>();
        try {
            List<Future<List<ClassInfo>>> results = executorService.invokeAll(tasks);
            //结果汇总
            for (Future<List<ClassInfo>> future : results ) {
                allClassInfoList.addAll(future.get());
            }
        }catch (Exception e) {
            e.printStackTrace();
        }finally {
            // 关闭线程池
            executorService.shutdown();
        }
        return allClassInfoList;
    }

    /**
     * 单个差异文件对比
     */
    private synchronized static ClassInfo prepareDiffMethodForTag(GitAdapter gitAdapter, String newTag, String oldTag, DiffFormatter df, DiffEntry diffEntry) {
        List<MethodInfo> methodInfoList = new ArrayList<MethodInfo>();
        try {
            String newJavaPath = diffEntry.getNewPath();
            //  排除测试类
            if (newJavaPath.contains("/src/test/java/")) {
                return null;
            }
            //  非java文件 和 删除类型不记录
            if (!newJavaPath.endsWith(".java") || diffEntry.getChangeType() == DiffEntry.ChangeType.DELETE){
                return null;
            }
            String newClassContent = gitAdapter.getTagRevisionSpecificFileContent(newTag,newJavaPath);
            ASTGenerator newAstGenerator = new ASTGenerator(newClassContent);
            /*  新增类型   */
            if (diffEntry.getChangeType() == DiffEntry.ChangeType.ADD) {
                return newAstGenerator.getClassInfo();
            }
            /*  修改类型  */
            //  获取文件差异位置，从而统计差异的行数，如增加行数，减少行数
            FileHeader fileHeader = df.toFileHeader(diffEntry);
            List<int[]> addLines = new ArrayList<int[]>();
            List<int[]> delLines = new ArrayList<int[]>();
            EditList editList = fileHeader.toEditList();
            for(Edit edit : editList){
                if (edit.getLengthA() > 0) {
                    delLines.add(new int[]{edit.getBeginA(), edit.getEndA()});
                }
                if (edit.getLengthB() > 0 ) {
                    addLines.add(new int[]{edit.getBeginB(), edit.getEndB()});
                }
            }
            String oldJavaPath = diffEntry.getOldPath();
            String oldClassContent = gitAdapter.getTagRevisionSpecificFileContent(oldTag,oldJavaPath);
            ASTGenerator oldAstGenerator = new ASTGenerator(oldClassContent);
            MethodDeclaration[] newMethods = newAstGenerator.getMethods();
            MethodDeclaration[] oldMethods = oldAstGenerator.getMethods();
            Map<String, MethodDeclaration> methodsMap = new HashMap<String, MethodDeclaration>();
            for (int i = 0; i < oldMethods.length; i++) {
                methodsMap.put(oldMethods[i].getName().toString()+ oldMethods[i].parameters().toString(), oldMethods[i]);
            }
            for (final MethodDeclaration method : newMethods) {
                // 如果方法名是新增的,则直接将方法加入List
                if (!ASTGenerator.isMethodExist(method, methodsMap)) {
                    MethodInfo methodInfo = newAstGenerator.getMethodInfo(method);
                    methodInfoList.add(methodInfo);
                    continue;
                }
                // 如果两个版本都有这个方法,则根据MD5判断方法是否一致
                if (!ASTGenerator.isMethodTheSame(method, methodsMap.get(method.getName().toString()+ method.parameters().toString()))) {
                    MethodInfo methodInfo =  newAstGenerator.getMethodInfo(method);
                    methodInfoList.add(methodInfo);
                }
            }
            return newAstGenerator.getClassInfo(methodInfoList, addLines, delLines);
        }catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 多线程执行对比
     */
    private static List<ClassInfo> batchPrepareDiffMethod(final GitAdapter gitAdapter, final String branchName, final String oldBranchName, final DiffFormatter df, List<DiffEntry> diffs) {
        int threadSize = 100;
        int dataSize = diffs.size();
        int threadNum = dataSize / threadSize + 1;
        boolean special = dataSize % threadSize == 0;
        ExecutorService executorService = Executors.newFixedThreadPool(threadNum);

        List<Callable<List<ClassInfo>>> tasks = new ArrayList<Callable<List<ClassInfo>>>();
        Callable<List<ClassInfo>> task = null;
        List<DiffEntry> cutList = null;
        //  分解每条线程的数据
        for (int i = 0; i < threadNum; i++) {
            if (i == threadNum - 1) {
                if (special) {
                    break;
                }
                cutList = diffs.subList(threadSize * i, dataSize);
            } else {
                cutList = diffs.subList(threadSize * i, threadSize * (i + 1));
            }
            final List<DiffEntry> diffEntryList = cutList;
            task = new Callable<List<ClassInfo>>() {
                public List<ClassInfo> call() throws Exception {
                    List<ClassInfo> allList = new ArrayList<ClassInfo>();
                    for (DiffEntry diffEntry : diffEntryList) {
                        ClassInfo classInfo = prepareDiffMethod(gitAdapter, branchName, oldBranchName, df, diffEntry);
                        if (classInfo != null) {
                            allList.add(classInfo);
                        }
                    }
                    return allList;
                }
            };
            // 这里提交的任务容器列表和返回的Future列表存在顺序对应的关系
            tasks.add(task);
        }
        List<ClassInfo> allClassInfoList = new ArrayList<ClassInfo>();
        try {
            List<Future<List<ClassInfo>>> results = executorService.invokeAll(tasks);
            //结果汇总
            for (Future<List<ClassInfo>> future : results ) {
                allClassInfoList.addAll(future.get());
            }
        }catch (Exception e) {
            e.printStackTrace();
        }finally {
            // 关闭线程池
            executorService.shutdown();
        }
        return allClassInfoList;
    }

    /**
     * 单个差异文件对比
     */
    private synchronized static ClassInfo prepareDiffMethod(GitAdapter gitAdapter, String branchName, String oldBranchName, DiffFormatter df, DiffEntry diffEntry) {
        List<MethodInfo> methodInfoList = new ArrayList<MethodInfo>();
        try {
            String newJavaPath = diffEntry.getNewPath();
            //  排除测试类
            if (newJavaPath.contains("/src/test/java/")) {
                return null;
            }
            //  非java文件 和 删除类型不记录
            if (!newJavaPath.endsWith(".java") || diffEntry.getChangeType() == DiffEntry.ChangeType.DELETE){
                return null;
            }
            String newClassContent = gitAdapter.getBranchSpecificFileContent(branchName,newJavaPath);
            ASTGenerator newAstGenerator = new ASTGenerator(newClassContent);
            /*  新增类型   */
            if (diffEntry.getChangeType() == DiffEntry.ChangeType.ADD) {
                return newAstGenerator.getClassInfo();
            }
            /*  修改类型  */
            //  获取文件差异位置，从而统计差异的行数，如增加行数，减少行数
            FileHeader fileHeader = df.toFileHeader(diffEntry);
            List<int[]> addLines = new ArrayList<int[]>();
            List<int[]> delLines = new ArrayList<int[]>();
            EditList editList = fileHeader.toEditList();
            for(Edit edit : editList){
                if (edit.getLengthA() > 0) {
                    delLines.add(new int[]{edit.getBeginA(), edit.getEndA()});
                }
                if (edit.getLengthB() > 0 ) {
                    addLines.add(new int[]{edit.getBeginB(), edit.getEndB()});
                }
            }
            String oldJavaPath = diffEntry.getOldPath();
            String oldClassContent = gitAdapter.getBranchSpecificFileContent(oldBranchName,oldJavaPath);
            ASTGenerator oldAstGenerator = new ASTGenerator(oldClassContent);
            MethodDeclaration[] newMethods = newAstGenerator.getMethods();
            MethodDeclaration[] oldMethods = oldAstGenerator.getMethods();
            Map<String, MethodDeclaration> methodsMap = new HashMap<String, MethodDeclaration>();
            for (int i = 0; i < oldMethods.length; i++) {
                methodsMap.put(oldMethods[i].getName().toString()+ oldMethods[i].parameters().toString(), oldMethods[i]);
            }
            for (final MethodDeclaration method : newMethods) {
                // 如果方法名是新增的,则直接将方法加入List
                if (!ASTGenerator.isMethodExist(method, methodsMap)) {
                    MethodInfo methodInfo = newAstGenerator.getMethodInfo(method);
                    methodInfoList.add(methodInfo);
                    continue;
                }
                // 如果两个版本都有这个方法,则根据MD5判断方法是否一致
                if (!ASTGenerator.isMethodTheSame(method, methodsMap.get(method.getName().toString()+ method.parameters().toString()))) {
                    MethodInfo methodInfo =  newAstGenerator.getMethodInfo(method);
                    methodInfoList.add(methodInfo);
                }
            }
            return newAstGenerator.getClassInfo(methodInfoList, addLines, delLines);
        }catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
}

　　4、新增GitAdapter类：

package org.jacoco.core.internal.diff;

import org.eclipse.jgit.api.CreateBranchCommand;
import org.eclipse.jgit.api.Git;
import org.eclipse.jgit.api.errors.GitAPIException;
import org.eclipse.jgit.lib.*;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevTree;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.transport.UsernamePasswordCredentialsProvider;
import org.eclipse.jgit.treewalk.AbstractTreeIterator;
import org.eclipse.jgit.treewalk.CanonicalTreeParser;
import org.eclipse.jgit.treewalk.TreeWalk;

import java.io.*;
import java.util.*;

/**
 * Git操作类
 */
public class GitAdapter {
    private Git git;
    private Repository repository;
    private String gitFilePath;

    //  Git授权
    private static UsernamePasswordCredentialsProvider usernamePasswordCredentialsProvider;

    public GitAdapter(String gitFilePath) {
        this.gitFilePath = gitFilePath;
        this.initGit(gitFilePath);
    }
    private void initGit(String gitFilePath) {
        try {
            git = Git.open(new File(gitFilePath));
            repository = git.getRepository();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public String getGitFilePath() {
        return gitFilePath;
    }

    public Git getGit() {
        return git;
    }

    public Repository getRepository() {
        return repository;
    }

    /**
     * git授权。需要设置拥有所有权限的用户
     * @param username  git用户名
     * @param password  git用户密码
     */
    public static void setCredentialsProvider(String username, String password) {
        if(usernamePasswordCredentialsProvider == null || !usernamePasswordCredentialsProvider.isInteractive()){
            usernamePasswordCredentialsProvider = new UsernamePasswordCredentialsProvider(username,password);
        }
    }

    /**
     * 获取指定分支的指定文件内容
     * @param branchName        分支名称
     * @param javaPath          文件路径
     * @return  java类
     * @throws IOException
     */
    public String getBranchSpecificFileContent(String branchName, String javaPath) throws IOException {
        Ref branch = repository.exactRef("refs/heads/" + branchName);
        ObjectId objId = branch.getObjectId();
        RevWalk walk = new RevWalk(repository);
        RevTree tree = walk.parseTree(objId);
        return  getFileContent(javaPath,tree,walk);
    }

    /**
     * 获取指定分支指定Tag版本的指定文件内容
     * @param tagRevision       Tag版本
     * @param javaPath          件路径
     * @return  java类
     * @throws IOException
     */
    public String getTagRevisionSpecificFileContent(String tagRevision, String javaPath) throws IOException {
        ObjectId objId = repository.resolve(tagRevision);
        RevWalk walk = new RevWalk(repository);
        RevCommit revCommit = walk.parseCommit(objId);
        RevTree tree = revCommit.getTree();
        return  getFileContent(javaPath,tree,walk);
    }
    
    /**
     * 获取指定分支指定的指定文件内容
     * @param javaPath      件路径
     * @param tree          git RevTree
     * @param walk          git RevWalk
     * @return  java类
     * @throws IOException
     */
    private String getFileContent(String javaPath,RevTree tree,RevWalk walk) throws IOException {
        TreeWalk treeWalk = TreeWalk.forPath(repository, javaPath, tree);
        ObjectId blobId = treeWalk.getObjectId(0);
        ObjectLoader loader = repository.open(blobId);
        byte[] bytes = loader.getBytes();
        walk.dispose();
        return new String(bytes);
    }

    /**
     * 分析分支树结构信息
     * @param localRef      本地分支
     * @return
     * @throws IOException
     */
    public AbstractTreeIterator prepareTreeParser(Ref localRef) throws IOException {
        RevWalk walk = new RevWalk(repository);
        RevCommit commit = walk.parseCommit(localRef.getObjectId());
        RevTree tree = walk.parseTree(commit.getTree().getId());
        CanonicalTreeParser treeParser = new CanonicalTreeParser();
        ObjectReader reader = repository.newObjectReader();
        treeParser.reset(reader, tree.getId());
        walk.dispose();
        return treeParser;
    }
    /**
     * 切换分支
     * @param branchName    分支名称
     * @throws GitAPIException GitAPIException
     */
    public void checkOut(String branchName) throws GitAPIException {
        //  切换分支
        git.checkout().setCreateBranch(false).setName(branchName).call();
    }

    /**
     * 更新分支代码
     * @param localRef      本地分支
     * @param branchName    分支名称
     * @throws GitAPIException GitAPIException
     */
    public void checkOutAndPull(Ref localRef, String branchName) throws GitAPIException {
        boolean isCreateBranch = localRef == null;
        if (!isCreateBranch && checkBranchNewVersion(localRef)) {
            return;
        }
        //  切换分支
        git.checkout().setCreateBranch(isCreateBranch).setName(branchName).setStartPoint("origin/" + branchName).setUpstreamMode(CreateBranchCommand.SetupUpstreamMode.SET_UPSTREAM).call();
        //  拉取最新代码
        git.pull().setCredentialsProvider(usernamePasswordCredentialsProvider).call();
    }

    /**
     * 判断本地分支是否是最新版本。目前不考虑分支在远程仓库不存在，本地存在
     * @param localRef  本地分支
     * @return  boolean
     * @throws GitAPIException GitAPIException
     */
    private boolean checkBranchNewVersion(Ref localRef) throws GitAPIException {
        String localRefName = localRef.getName();
        String localRefObjectId = localRef.getObjectId().getName();
        //  获取远程所有分支
        Collection<Ref> remoteRefs = git.lsRemote().setCredentialsProvider(usernamePasswordCredentialsProvider).setHeads(true).call();
        for (Ref remoteRef : remoteRefs) {
            String remoteRefName = remoteRef.getName();
            String remoteRefObjectId = remoteRef.getObjectId().getName();
            if (remoteRefName.equals(localRefName)) {
                if (remoteRefObjectId.equals(localRefObjectId)) {
                    return true;
                }
                return false;
            }
        }
        return false;
    }
}

　　5、新增MethodInfo类：

package org.jacoco.core.internal.diff;

public class MethodInfo {
    /**
     * 方法的md5
     */
    public String md5;
    /**
     * 方法名
     */
    public String methodName;
    /**
     * 方法参数
     */
    public String parameters;

    public String getMd5() {
        return md5;
    }

    public void setMd5(String md5) {
        this.md5 = md5;
    }

    public String getMethodName() {
        return methodName;
    }

    public void setMethodName(String methodName) {
        this.methodName = methodName;
    }

    public String getParameters() {
        return parameters;
    }

    public void setParameters(String parameters) {
        this.parameters = parameters;
    }
}

第四步：修改org.jacoco.core.internal.flow包下的ClassProbesAdapter类：

　　1、修改代码第66行visitMethod方法：

　　@Override
    public final MethodVisitor visitMethod(final int access, final String name,
            final String desc, final String signature, final String[] exceptions) {
        final MethodProbesVisitor methodProbes;
        final MethodProbesVisitor mv = cv.visitMethod(access, name, desc,
                signature, exceptions);
        //    增量计算覆盖率
        if (mv !=null && isContainsMethod(name, CoverageBuilder.classInfos)) {
            methodProbes = mv;
        } else {
            // We need to visit the method in any case, otherwise probe ids
            // are not reproducible
            methodProbes = EMPTY_METHOD_PROBES_VISITOR;
        }
        return new MethodSanitizer(null, access, name, desc, signature,
                exceptions) {

            @Override
            public void visitEnd() {
                super.visitEnd();
                LabelFlowAnalyzer.markLabels(this);
                final MethodProbesAdapter probesAdapter = new MethodProbesAdapter(
                        methodProbes, ClassProbesAdapter.this);
                if (trackFrames) {
                    final AnalyzerAdapter analyzer = new AnalyzerAdapter(
                            ClassProbesAdapter.this.name, access, name, desc,
                            probesAdapter);
                    probesAdapter.setAnalyzer(analyzer);
                    methodProbes.accept(this, analyzer);
                } else {
                    methodProbes.accept(this, probesAdapter);
                }
            }
        };
    }

　　2、新增私有方法

　　private boolean isContainsMethod(String currentMethod, List<ClassInfo> classInfos) {
        if (classInfos== null || classInfos.isEmpty()) {
            return true;
        }
        String currentClassName = name.replaceAll("/",".");
        for (ClassInfo classInfo : classInfos) {
            String className = classInfo.getPackages() + "." + classInfo.getClassName();
            if (currentClassName.equals(className)) {
                for (MethodInfo methodInfo: classInfo.getMethodInfos()) {
                    String methodName = methodInfo.getMethodName();
                    if (currentMethod.equals(methodName)) {
                        return true;
                    }
                }
            }
        }
        return false;
    }

　

第五步：修改org.jacoco.report项目中org.jacoco.report.internal.html.page包下的SourceHighlighter类：

　　1、修改代码第72行的render方法：

public void render(final HTMLElement parent, final ISourceNode source,
            final Reader contents) throws IOException {
        final HTMLElement pre = parent.pre(Styles.SOURCE + " lang-" + lang
                + " linenums");
        final BufferedReader lineBuffer = new BufferedReader(contents);
        String classPath = ((SourceFileCoverageImpl) source).getPackageName() + "." + source.getName().replaceAll(".java","");
        classPath = classPath.replaceAll("/",".");
        String line;
        int nr = 0;
        while ((line = lineBuffer.readLine()) != null) {
            nr++;
            renderCodeLine(pre, line, source.getLine(nr), nr,classPath);
        }
    }

　　2、修改代码第87行renderCodeLine方法：

private void renderCodeLine(final HTMLElement pre, final String linesrc,
            final ILine line, final int lineNr, final String classPath) throws IOException {
        if (CoverageBuilder.classInfos == null || CoverageBuilder.classInfos.isEmpty()) {
            //    全量覆盖
            highlight(pre, line, lineNr).text(linesrc);
            pre.text("
");
        } else {
            //    增量覆盖
            boolean existFlag = true;
            for (ClassInfo classInfo : CoverageBuilder.classInfos) {
                String tClassPath = classInfo.getPackages() + "." + classInfo.getClassName();
                if (classPath.equals(tClassPath)) {
                    //    新增的类
                    if ("ADD".equalsIgnoreCase(classInfo.getType())) {
                        highlight(pre, line, lineNr).text("+ " + linesrc);
                        pre.text("
");
                    } else {
                        //    修改的类
                        boolean flag = false;
                        List<int[]> addLines = classInfo.getAddLines();
                        for (int[] ints: addLines) {
                            if (ints[0] <= lineNr &&  lineNr <= ints[1]){
                                flag = true;
                                break;
                            }
                        }
                        if (flag) {
                            highlight(pre, line, lineNr).text("+ " + linesrc);
                            pre.text("
");
                        } else {
                            highlight(pre, line, lineNr).text(" " + linesrc);
                            pre.text("
");
                        }
                    }
                    existFlag = false;
                    break;
                }
            }
            if (existFlag) {
                highlight(pre, line, lineNr).text(" " + linesrc);
                pre.text("
");
            }
        }
    }

使用方式：

　　在org.jacoco.examples项目中，新增一个包，然后新增如下类：

　　1、用于生成exec的ExecutionDataClient类：

import java.io.FileOutputStream;
import java.io.IOException;
import java.net.InetAddress;
import java.net.Socket;
import org.jacoco.core.data.ExecutionDataWriter;
import org.jacoco.core.runtime.RemoteControlReader;
import org.jacoco.core.runtime.RemoteControlWriter;

/**
 * 用于生成exec文件
 */
public class ExecutionDataClient {
    private static final String DESTFILE = "D:\Git\Jacoco-Test\jacoco.exec";//导出的文件路径

    private static final String ADDRESS = "127.0.0.1";//配置的Jacoco的IP

    private static final int PORT = 9001;//Jacoco监听的端口

    public static void main(final String[] args) throws IOException {
        final FileOutputStream localFile = new FileOutputStream(DESTFILE);
        final ExecutionDataWriter localWriter = new ExecutionDataWriter(
                localFile);

        //连接Jacoco服务
        final Socket socket = new Socket(InetAddress.getByName(ADDRESS), PORT);
        final RemoteControlWriter writer = new RemoteControlWriter(socket.getOutputStream());
        final RemoteControlReader reader = new RemoteControlReader(socket.getInputStream());
        reader.setSessionInfoVisitor(localWriter);
        reader.setExecutionDataVisitor(localWriter);

        // 发送Dump命令，获取Exec数据
        writer.visitDumpCommand(true, false);
        if (!reader.read()) {
            throw new IOException("Socket closed unexpectedly.");
        }

        socket.close();
        localFile.close();
    }

    private ExecutionDataClient() {
    }
}

　　2、用于根据exec文件生成覆盖率报告的ReportGenerator类：

import java.io.File;
import java.io.IOException;

import org.jacoco.core.analysis.Analyzer;
import org.jacoco.core.analysis.CoverageBuilder;
import org.jacoco.core.analysis.IBundleCoverage;
import org.jacoco.core.internal.diff.GitAdapter;
import org.jacoco.core.tools.ExecFileLoader;
import org.jacoco.report.DirectorySourceFileLocator;
import org.jacoco.report.FileMultiReportOutput;
import org.jacoco.report.IReportVisitor;
import org.jacoco.report.MultiSourceFileLocator;
import org.jacoco.report.html.HTMLFormatter;

/**
 * 用于根据exec文件生成增量覆盖率报告
 */
public class ReportGenerator {

    private final String title;
    private final File executionDataFile;
    private final File classesDirectory;
    private final File sourceDirectory;
    private final File reportDirectory;
    private ExecFileLoader execFileLoader;

    public ReportGenerator(final File projectDirectory) {
        this.title = projectDirectory.getName();
        this.executionDataFile = new File(projectDirectory, "jacoco.exec");　　 //第一步生成的exec的文件
        this.classesDirectory = new File(projectDirectory, "bin");　　　　　　　　//目录下必须包含源码编译过的class文件,用来统计覆盖率。所以这里用server打出的jar包地址即可,运行的jar或者Class目录
        this.sourceDirectory = new File(projectDirectory, "src/main/java");　　 //源码目录
        this.reportDirectory = new File(projectDirectory, "coveragereport");　　//要保存报告的地址
    }

    public void create() throws IOException {
        loadExecutionData();
        final IBundleCoverage bundleCoverage = analyzeStructure();
        createReport(bundleCoverage);
    }

    private void createReport(final IBundleCoverage bundleCoverage)
            throws IOException {

        final HTMLFormatter htmlFormatter = new HTMLFormatter();
        final IReportVisitor visitor = htmlFormatter.createVisitor(new FileMultiReportOutput(reportDirectory));

        visitor.visitInfo(execFileLoader.getSessionInfoStore().getInfos(),execFileLoader.getExecutionDataStore().getContents());

        visitor.visitBundle(bundleCoverage, new DirectorySourceFileLocator(sourceDirectory, "utf-8", 4));
        
//        //多源码路径
//        MultiSourceFileLocator sourceLocator = new MultiSourceFileLocator(4);
//        sourceLocator.add( new DirectorySourceFileLocator(sourceDir1, "utf-8", 4));
//        sourceLocator.add( new DirectorySourceFileLocator(sourceDir2, "utf-8", 4));
//        sourceLocator.add( new DirectorySourceFileLocator(sourceDir3, "utf-8", 4));
//        visitor.visitBundle(bundleCoverage,sourceLocator);

        visitor.visitEnd();
    }

    private void loadExecutionData() throws IOException {
        execFileLoader = new ExecFileLoader();
        execFileLoader.load(executionDataFile);
    }

    private IBundleCoverage analyzeStructure() throws IOException {
        // git登录授权
        GitAdapter.setCredentialsProvider("QQ512433465", "mima512433465");
        // 全量覆盖
　　　　 // final CoverageBuilder coverageBuilder = new CoverageBuilder();
        
        // 基于分支比较覆盖，参数1：本地仓库，参数2：开发分支（预发分支），参数3：基线分支(不传时默认为master)
        // 本地Git路径，新分支 第三个参数不传时默认比较maser，传参数为待比较的基线分支
        final CoverageBuilder coverageBuilder = new CoverageBuilder("E:\Git-pro\JacocoTest","daily");
        
        // 基于Tag比较的覆盖 参数1：本地仓库，参数2：代码分支，参数3：新Tag(预发版本)，参数4：基线Tag（变更前的版本）
        //final CoverageBuilder coverageBuilder = new CoverageBuilder("E:\Git-pro\JacocoTest","daily","v004","v003");
        
        final Analyzer analyzer = new Analyzer(execFileLoader.getExecutionDataStore(), coverageBuilder);

        analyzer.analyzeAll(classesDirectory);

        return coverageBuilder.getBundle(title);
    }

    public static void main(final String[] args) throws IOException {
        final ReportGenerator generator = new ReportGenerator(new File("D:\Git\Jacoco-Test"));
        generator.create();
    }
}

参考代码：

　　https://github.com/512433465/JacocoPlus

　　https://github.com/fang-yan-peng/diff-jacoco