马骝

package com.lhj.filetest.filetest;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.RandomAccessFile;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipException;
import java.util.zip.ZipFile;
import java.util.zip.ZipInputStream;

public class MainActivity extends Activity implements View.OnClickListener {
    //java.io.File f = new File("d:/111/222/333");

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button newFile = (Button) findViewById(R.id.create_file);
        newFile.setOnClickListener(this);
        Button delFile = (Button) findViewById(R.id.del_file);
        delFile.setOnClickListener(this);
        Button unzip_file = (Button) findViewById(R.id.unzip_file);
        unzip_file.setOnClickListener(this);
        Button w_file = (Button) findViewById(R.id.write_file);
        w_file.setOnClickListener(this);
    }

    public String getInnerSDCardPath() {
        return Environment.getExternalStorageDirectory().getPath();
    }

    String path = Environment.getExternalStorageDirectory().getPath() + "/esales/report";
    String delPath = Environment.getExternalStorageDirectory().getPath() + "/esales";
    String txtPath = path + "/temp.txt";

    @Override
    public void onClick(View v) {
        int id = v.getId();
        switch (id) {
            case R.id.create_file:
                File file = new File(path);
                if (file.exists()) {
                    Toast.makeText(this, " file is exists", Toast.LENGTH_SHORT).show();
                } else if (createDir(file)) {
                    Toast.makeText(this, "new file success", Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(this, "new file fail", Toast.LENGTH_SHORT).show();
                }
                break;
            case R.id.del_file:
                File file2 = new File(delPath);
                if (deleteDir(file2)) {
                    Toast.makeText(this, "delete file success", Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(this, "delete file fail", Toast.LENGTH_SHORT).show();
                }
                break;
            case R.id.unzip_file:
                //zipDecompressing();
                String zipPath = Environment.getExternalStorageDirectory().getPath() + "/temp.zip";
                String unzipPath=  Environment.getExternalStorageDirectory().getPath() + "/AAA/";
                try {
                    unZipFiles(zipPath, unzipPath);
                } catch (IOException e) {
                    e.printStackTrace();
                }
                break;
            case R.id.write_file:
                File file4 = new File(txtPath);
                if (writeTxtFile("12331  : 你ddd好", file4)) {
                    Toast.makeText(this, "write file success", Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(this, "write file fail", Toast.LENGTH_SHORT).show();
                }
                break;
        }
    }


    /**
     * 递归删除目录下的所有文件及子目录下所有文件
     *
     * @param dir 将要删除的文件目录
     * @return boolean Returns "true" if all deletions were successful.
     * If a deletion fails, the method stops attempting to
     * delete and returns "false".
     */
    private static boolean deleteDir(File dir) {
        if (dir.isDirectory()) {
            String[] children = dir.list();
            //递归删除目录中的子目录下
            for (int i = 0; i < children.length; i++) {
                boolean success = deleteDir(new File(dir, children[i]));
                if (!success) {
                    return false;
                }
            }
        }
        // 目录此时为空，可以删除
        return dir.delete();
    }

    private static boolean createDir(File file) {
        return file.mkdirs();
    }

    //写入文件（覆盖原來的內容）
    public static boolean writeTxtFile(String content, File fileName) {
        boolean flag = false;
        FileOutputStream o;
        try {
            o = new FileOutputStream(fileName);
            o.write(content.getBytes("UTF-8"));
            o.close();
            flag = true;
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
        }
        return flag;
    }

    /**
     * 解压到指定目录
     * @param zipPath
     * @param descDir
     * @author isea533
     */
    public static void unZipFiles(String zipPath,String descDir)throws IOException{
        unZipFiles(new File(zipPath), descDir);
    }
    /**
     * 解压文件到指定目录
     * @param zipFile
     * @param descDir
     * @author isea533
     */
    public static void unZipFiles(File zipFile,String descDir)throws IOException{
        File pathFile = new File(descDir);
        if(!pathFile.exists()){
            pathFile.mkdirs();
        }
        ZipFile zip = new ZipFile(zipFile);
        for(Enumeration entries = zip.entries();entries.hasMoreElements();){
            ZipEntry entry = (ZipEntry)entries.nextElement();
            String zipEntryName = entry.getName();
            InputStream in = zip.getInputStream(entry);
            String outPath = (descDir+zipEntryName).replaceAll("\\*", "/");;
            //判断路径是否存在,不存在则创建文件路径
            File file = new File(outPath.substring(0, outPath.lastIndexOf('/')));
            if(!file.exists()){
                file.mkdirs();
            }
            //判断文件全路径是否为文件夹,如果是上面已经上传,不需要解压
            if(new File(outPath).isDirectory()){
                continue;
            }
            //输出文件路径信息
            System.out.println(outPath);

            OutputStream out = new FileOutputStream(outPath);
            byte[] buf1 = new byte[1024];
            int len;
            while((len=in.read(buf1))>0){
                out.write(buf1,0,len);
            }
            in.close();
            out.close();
        }
        System.out.println("******************解压完毕********************");
    }
}

import java.io.File;
 
public class Main {
    public static void main(String[] argv) throws Exception {
        File dir = new File("../java");
        String[] children = dir.list();
        if (children == null) {
            System.out.println("该目录不存在");
        }
        else {
            for (int i = 0; i < children.length; i++) {
                String filename = children[i];
                System.out.println(filename);
            }
        }
   以上代码运行输出结果为：

Car.class
FileUtil.class
FileUtil.java
HelloWorld.class
HelloWorld.java
HelloWorldDebug.class
HelloWorldDebug.java