Java中zip文件压缩与解压之ZipInputStream和ZipOutputStream

//zipOut：压缩文件的路径
ZipOutputStream zipOutputStream = new ZipOutputStream(new FileOutputStream(zipOut));
//zipOutputStream.putNextEntry()  ====> 向压缩包中添加一个文件
//new ZipEntry("text1.txt") ======⇒ zip压缩包中文件都是用ZipEntry对象，
//"text1.txt"===》是文件在压缩文件的路径，text1.txt表示在压缩文件的根路径

zipOutputStream.putNextEntry(new ZipEntry("text1.txt"));

    static final int  BUFFER_SIZE = 4 << 10;
    /**
     * 压缩指定目录下的所有文件
     * @param dir 指定压缩目录
     * @param destZipName 指定压缩包名字
     */
    public void zip(String dir,String zipPath,String destZipName) throws IOException {
        File file = new File(dir);
        /**1.为zip文件创建目录*****/
        String path = file.getParentFile().getAbsolutePath();
        if(isNull(destZipName))destZipName = file.getName()+".zip";
        if(isNull(zipPath)) zipPath = path;
        String zipOut = zipPath + File.separator + destZipName;
        File zipOutFile = new File(zipOut);
        if(!zipOutFile.getParentFile().exists()){
            zipOutFile.getParentFile().mkdirs();
        }
        /**为zip文件创建目录*****/
        ZipOutputStream zipOutputStream = new ZipOutputStream(new FileOutputStream(zipOut));
        if(!file.isDirectory())zipOutputStream.close();
        File[] subFiles = file.listFiles();
        for (File subFile : subFiles) {
            buildZipDir(zipOutputStream,subFile,null);
        }
        zipOutputStream.close();
    }
    void buildZipDir(ZipOutputStream zipOut,File file,String baseDir) throws IOException {
        if(file.isFile()){
            String zipEntryName = baseDir == null ? file.getName() : baseDir+File.separator+file.getName();
            zipOut.putNextEntry(new ZipEntry(zipEntryName));
            byte[] buffer = new byte[BUFFER_SIZE];
            try(InputStream inputStream = new FileInputStream(file)){
                int len = -1;
                while((len = inputStream.read(buffer)) != -1){
                    zipOut.write(buffer,0,len);
                }
                zipOut.flush();
                zipOut.closeEntry();
            }
        }
        else{//文件是dir，继续递归找文件
            File[] subFiles = file.listFiles();
            if(subFiles.length ==0){//处理空文件夹
                String zipName = baseDir == null ? file.getName() :baseDir + File.separator+ file.getName() ;
                zipOut.putNextEntry(new ZipEntry(zipName));
                zipOut.closeEntry();
            }else{
                for (File subFile : subFiles) {
                    String subBaseDir =baseDir == null ? file.getName() :baseDir + File.separator+ file.getName() ;
                    buildZipDir(zipOut,subFile,subBaseDir);
                }
            }
        }
    }
    public boolean isNull(String str){
        return str == null || str.equals("");
    }

    @Test
    public void testZip() throws IOException {
     String dir = "D:\\test-zip";
     //dir : 要压缩的目录
     //D:\\yy\\    指定压缩文件的位置
     //path-test.zip 指定压缩文件的名字
     zip(dir,"D:\\yy\\","path-test.zip");
    }

    public void unZip(String zipPath,String unzipPath) throws IOException {
        File file = new File(zipPath);
        ZipFile zipFile = new ZipFile(file);//zip文件
        ZipInputStream zipInputStream = new ZipInputStream(new FileInputStream(file));
        if(isNull(unzipPath))unzipPath = zipPath.replace(".zip","");
        ZipEntry nextEntry = null;
        while( (nextEntry = zipInputStream.getNextEntry()) != null){
            String name = nextEntry.getName();
            String fileOutPath = unzipPath + File.separator + name;
            File fileOut = new File(fileOutPath);
            if(!fileOut.getParentFile().exists()){
                fileOut.getParentFile().mkdirs();
            }
            if(!fileOut.exists()){
                fileOut.createNewFile();
            }
            OutputStream  output = new FileOutputStream(fileOutPath);
            InputStream inputStream = zipFile.getInputStream(nextEntry);//通过ZipFile获取到ZipEntry的文件流
            int read = -1;
            byte[] buffer = new byte[BUFFER_SIZE];
            while((read = inputStream.read(buffer) ) != -1){
                output.write(buffer,0, read);
            }
            output.flush();
            output.close();
            inputStream.close();
        }
        zipInputStream.close();
        zipFile.close();
    }

   public void testUnzip() throws IOException {
        String zip = "D:\\yy\\path-test.zip";
        unZip(zip,null);
    }