一个逆向工程的尝试

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.LinkedList;
import java.util.List;
import java.util.regex.Pattern;
    
public class InsertLogIntoFile {
        
    private static List<String> list = new LinkedList<>();
    private static final String resourceLocation = "/H:/git_studyspace/spring/src/main/java/org";      
    private static final String loggerPath = "lsh.spring.util.Log.info();";
    private static final String methodMarks = "byte,short,int,long,float,double,boolean,char,void";
        
    public static void main(String[] args) {
        readJavaFile(new File(resourceLocation));
    }
     
    public static String getCurrentPath(Class<?> clazz) {
        return clazz.getResource(".").getPath();
    }
        
    private static void readJavaFile(File file) {
        if(file.isDirectory()) {
            File[] files = file.listFiles();
            for (File unit : files) {
                if(unit.isFile()) {//如果是文件，则进行进一步的编辑
                    if(unit.getName().endsWith("InsertLogIntoFile.java")
                            || unit.getName().contains("AddLogToFile.java")
                            || unit.getName().contains("Log.java")) {
                        continue;
                    }
                    judgeLineByLine(unit.getAbsolutePath());
                }else {
                    readJavaFile(unit);
                }
            }
        }else {
            if(file.getName().endsWith("InsertLogIntoFile.java")
                    || file.getName().contains("AddLogToFile.java")
                    || file.getName().contains("Log.java")) {
                return;
            }
            judgeLineByLine(file.getAbsolutePath());
        }
    }
        
    private static void judgeLineByLine(String file) {
        BufferedReader br = null;
        try {
            //先将文件都按行读取到缓存中
            br = new BufferedReader(new FileReader(file));
            String line = null;
            while((line = br.readLine()) != null) {
                list.add(line);
            }
            br.close();

            //从缓存中读取文件内容时按需要修改内容，重新写入到文件当中
            BufferedWriter bw = null;
            bw = new BufferedWriter(new FileWriter(file));
            for (String string : list) {
                if(file.endsWith(".java")) {
                    String newLine = judgeMethodLocation(string);
                    bw.write(newLine);
                    bw.write("
");
                }else {
                    bw.write(string);
                    bw.write("
");
                }                
            }
            list.clear();
            bw.write("
");
            bw.flush();
            bw.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    //判断方法签名所在行，如果是方法签名，则在下一行插入日志并返回字符串
    private static String judgeMethodLocation(String str) {
        if(!(str.trim().contains("(")&&str.contains(")")&&str.contains("{")&&!str.contains("}"))||str.trim().startsWith("//")) {
            return str;
        }
        String[] arr = str.split("[(]");
        int mark = str.indexOf("(");
        //如果按照“(”进行字符串拆分得到的长度不小于2，且原字符串中字符“(”的前一个字符不为空
        if(arr.length == 2 && (str.toCharArray()[mark-1] !=' ')) {
            String[] arr2 = arr[arr.length-2].split(" ");
                int length2 = arr2.length;
                if(startWithLowerCase(arr2[length2 - 1]) &&length2 >= 2 && (startWithUpperCase(arr2[length2-2]) || matchBasicType(arr2[length2-2]))) {
                    return insertLoggerCommand(str);
                }
            }
        return str;
    }
     
    private static boolean startWithUpperCase(String str) {
        if(str.trim().length() == 0) {
            return false;
        }
        String regex = "[A-Z]";
        Pattern p = Pattern.compile(regex);
        return p.matcher(str.substring(0, 1)).matches();
    }
     
    private static boolean startWithLowerCase(String str) {
        if(str.trim().length() == 0) {
            return false;
        }
        String regex = "[a-z]";
        Pattern p = Pattern.compile(regex);
        return p.matcher(str.substring(0, 1)).matches();
    }
     
    public static boolean matchBasicType(String str) {
        String[] arr = methodMarks.split(",");
        for (String string : arr) {
            if(string.equals(str) || (string+"[]").equals(string)) {
                return true;
            }
        }
        return false;
    }
        
    //插入日志
    private static String insertLoggerCommand(String lineStr) {
        StringBuilder sb = new StringBuilder(lineStr);
        sb.append("
        ")
          .append(loggerPath);
        return sb.toString();
    }
    
}

import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintStream;

public class Log {
    
    private static int count = 0;
    
    private static PrintStream ps = null;
    
    static {
        try {
            ps = new PrintStream(new File("beanDefinitionLoad.md"));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }
    
    public static void main(String[] args) {
        
    }

    public static void info() {
        StackTraceElement[] ste = new Exception().getStackTrace();
        String className = ste[1].getClassName();
        String methodName = ste[1].getMethodName();
        int lineNumber = ste[1].getLineNumber();
        StringBuilder sb = new StringBuilder();
        for (int i=0; i <= count; i++) {
            sb.append(" ");
        }
        count++;
        ps.println(sb+"["+className+"."+methodName+": "+lineNumber+"]");
        if(count == 30) {
            count = 0;
        }
    }
    
    public static void info(String str) {
        StackTraceElement[] ste = new Exception().getStackTrace();
        String className = ste[1].getClassName();
        String methodName = ste[1].getMethodName();
        int lineNumber = ste[1].getLineNumber();
        StringBuilder sb = new StringBuilder();
        for (int i=0; i <= count; i++) {
            sb.append(" ");
        }
        count++;
        System.out.println(sb+"["+className+"."+methodName+": "+lineNumber+"] "+str);
        if(count == 30) {
            count = 0;
        }
    }
}