java 编程思想 Directory工具类

package net.bigwrok;

import java.io.File;
import java.io.FilenameFilter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.regex.Pattern;

public class Directory_util {
    /*工具类 遍历当前目录的所有文件，可以查看所有 目录 ，以及文件
    
    */
    public static File[] local(File dir,final String reg){
        //遍历当前目录的文件
        return dir.listFiles(new FilenameFilter() {
            //文件名过滤器
            private Pattern p = Pattern.compile(reg);
            @Override
            public boolean accept(File dir, String name) {
                 System.out.println(dir+"  "+name);
                return p.matcher(name).matches();
                //ret name.endsWith("java");
            }
        });//return 
    }//local

        
    //遍历当前目录的文件
    public static File[] local(String path,final String reg){
        return local(new File(path),reg);
    }
    //内部类  files保存 所有文件的  dirs保存所有的目录
    public static class TreeInfo implements Iterable<File>{
        public List<File> files  =  new ArrayList<File>();
        public List<File> dirs  =  new ArrayList<File>();
        @Override
        public Iterator<File> iterator() {
            return files.iterator();
        }
        
        void addAll(TreeInfo other){
            files.addAll(other.files);
            dirs.addAll(other.dirs);
        }
        
        @Override
        public String toString() {
            // 格式化打印
            //return "dirs: " +dirs+"

files: "+files;
            return "dirs: " +PPrint.pformat(dirs)+"

files: "+PPrint.pformat(files);
        }
        
    }//静态内部类class TreeInfo  结束
    
    static TreeInfo recurseDirs(File startDir ,String reg){
        TreeInfo result = new TreeInfo();
        for (File item : startDir.listFiles()) {
            if (item.isDirectory()) {
                //如果是目录，目录列表dirs增加 item，目录下面所有的文件都放进result
                result.dirs.add(item);
                result.addAll(recurseDirs(item,reg));
            }else {
                if (startDir.getName().matches(reg)) {
                    // getName()获得文件名称，仅仅是文件名 不包括目录  如：xxxx.java
                    result.files.add(item);
                }
            }
        }//for
        return result;
        
    }//recurseDirs 方法结束
   
　　　　// walk 从当前目录一直遍历所有文件
    public static TreeInfo walk(String start ,String reg){
        return recurseDirs(new File(start), reg);
    } 
 
    
    public static TreeInfo walk(File start ,String reg){
        return recurseDirs( start , reg);
    } 
    
    
    public static TreeInfo walk(String start  ){
        return recurseDirs(new File(start), ".*");
    } 
    
    
    public static TreeInfo walk(File start ){
        return recurseDirs( start , ".*");
    } 
    
    
    
    public static void main(String[] args) throws IOException {
        File test = new File(".");
        System.out.println("绝对路径   "+test.getAbsolutePath());
        System.out.println("抽象路径   "+test.getCanonicalPath());
        TreeInfo str = walk( "D:\dev2\workspace\seehope\bigwork\src\com\");
        System.out.println(str);    
        /*
        files: [D:dev2workspaceseehopeigworksrccomColorChoseListener.java,
                D:dev2workspaceseehopeigworksrccomReadImg.java, 
                D:dev2workspaceseehopeigworksrccomTrueFrametest.java]
                        */

        TreeInfo str2 = walk( test);
        System.out.println(str2);    
        
       /* 
        dirs: [..settings, .in, .inc2, .incom, .in
et, .in
etigwrok, .src, .srcc2, .srccom, .src
et, .src
etigwrok]

        files: [..classpath, ..project, ..settingsorg.eclipse.jdt.core.prefs, .inc2Draw2.class, .inc2Drawing$1.class, .inc2Drawing.class, .inc2f.jpg, .inc2MymenuAdapter.class, .inc2MyMenuItemAction.class, .inc2MyStrokeAction.class, .inc2ShapeAndColor.class, .inc2TrueFrametest$1.class, .inc2TrueFrametest$2.class, .inc2TrueFrametest$3.class, .inc2TrueFrametest.class, .incomColorChoseListener.class, .incomDraw2.class, .incomMymenuAdapter.class, .incomMyMenuItemAction.class, .incomMyStrokeAction.class, .incomReadImg.class, .incomShapeAndColor.class, .incomTrueFrametest$1.class, .incomTrueFrametest$2.class, .incomTrueFrametest$3.class, .incomTrueFrametest$4.class, .incomTrueFrametest.class, .in
etigwrokDirectory_util$1.class, .in
etigwrokDirectory_util$TreeInfo.class, .in
etigwrokDirectory_util.class, .in
etigwrokInetAddrTest.class, .in
etigwrokInetAddrTest2.class, .in
etigwrokIO1.class, .in
etigwrokTest2_net.class, .in
etigwrokTest_net2.class, .srcc2Drawing.java, .srcc2f.jpg, .srcc2TrueFrametest.java, .srccomColorChoseListener.java, .srccomReadImg.java, .srccomTrueFrametest.java, .src
etigwrokDirectory_util.java, .src
etigwrokInetAddrTest.java, .src
etigwrokInetAddrTest2.java, .src
etigwrokIO1.java, .src
etigwrokTest2_net.java, .src
etigwrokTest_net2.java]

        */
        /*
        for (File file : Directory_util.walk(".", ".*[Zz].*\.java")) {
            System.out.println(file);
        }
        walk(start,reg);
        ".*[Zz].*\.java"      文件以.java结尾
        "T.*"                  T开头的任何文件
        "T.*\.java"           T开头的.java文件
        */
    }
    
    
        
}

打印工具类PPrint

package net.bigwrok;

import java.util.Arrays;
import java.util.Collection;

public class PPrint {
    
    
    
    public static String pformat(Collection<?> c){ 
        if (c.size() == 0) {
            return "[]";
        }
        
        StringBuilder res = new StringBuilder("[");
        for (Object elem : c) {
            if (c.size() != 1) {
                res.append("
");
            }
            res.append(elem);
        }//for

        if (c.size() != 1) {
            res.append("
");
        }
        res.append("]");
        return res.toString();
    }//pformat
    
    
    public static void pprint(Collection<?> c){
        System.out.println(pformat(c));
    }

    
    public static void pprint(Object[] c){
        System.out.println(Arrays.asList(c));
    }
    
    
    
    

}

运行结果

files: [
..classpath
..project
..settingsorg.eclipse.jdt.core.prefs
.inc2Draw2.class
.inc2Drawing$1.class
.inc2Drawing.class
.inc2f.jpg
.inc2MymenuAdapter.class
.inc2MyMenuItemAction.class
.inc2MyStrokeAction.class
.inc2ShapeAndColor.class
.inc2TrueFrametest$1.class
.inc2TrueFrametest$2.class
.inc2TrueFrametest$3.class
.inc2TrueFrametest.class
.incomColorChoseListener.class
.incomDraw2.class
.incomMymenuAdapter.class
.incomMyMenuItemAction.class
.incomMyStrokeAction.class
.incomReadImg.class
.incomShapeAndColor.class
.incomTrueFrametest$1.class
.incomTrueFrametest$2.class
.incomTrueFrametest$3.class
.incomTrueFrametest$4.class
.incomTrueFrametest.class
.in
etigwrokDirectory_util$1.class
.in
etigwrokDirectory_util$TreeInfo.class
.in
etigwrokDirectory_util.class
.in
etigwrokInetAddrTest.class
.in
etigwrokInetAddrTest2.class
.in
etigwrokIO1.class
.in
etigwrokIO2.class
.in
etigwrokPPrint.class
.in
etigwrokTest2_net.class
.in
etigwrokTest_net2.class
.srcc2Drawing.java
.srcc2f.jpg
.srcc2TrueFrametest.java
.srccomColorChoseListener.java
.srccomReadImg.java
.srccomTrueFrametest.java
.src
etigwrokDirectory_util.java
.src
etigwrokInetAddrTest.java
.src
etigwrokInetAddrTest2.java
.src
etigwrokIO1.java
.src
etigwrokIO2.java
.src
etigwrokPPrint.java
.src
etigwrokTest2_net.java
.src
etigwrokTest_net2.java
]