Java对Zip文件的支持不是很强大，有一些需要自己实现的代码，我在网上找了很多代码，都不能用于生产，要不就是流没有被关闭，要不就是Exception处理很随意，下面是我修改过并测试过的代码能用于生产的压缩和解压缩的代码，做一个代码备份。

使用递归算法将一个文件夹压缩成Zip文件：

static final int BUFFER = 8192;

public static void compress(String srcPath , String dstPath) throws IOException{
    File srcFile = new File(srcPath);
    File dstFile = new File(dstPath);
    if (!srcFile.exists()) {
        throw new FileNotFoundException(srcPath + "不存在！");
    }

    FileOutputStream out = null;
    ZipOutputStream zipOut = null;
    try {
        out = new FileOutputStream(dstFile);
        CheckedOutputStream cos = new CheckedOutputStream(out,new CRC32());
        zipOut = new ZipOutputStream(cos);
        String baseDir = "";
        compress(srcFile, zipOut, baseDir);
    }
    finally {
        if(null != zipOut){
            zipOut.close();
            out = null;
        }

        if(null != out){
            out.close();
        }
    }
}

private static void compress(File file, ZipOutputStream zipOut, String baseDir) throws IOException{
    if (file.isDirectory()) {
        compressDirectory(file, zipOut, baseDir);
    } else {
        compressFile(file, zipOut, baseDir);
    }
}

/** 压缩一个目录 */
private static void compressDirectory(File dir, ZipOutputStream zipOut, String baseDir) throws IOException{
    File[] files = dir.listFiles();
    for (int i = 0; i < files.length; i++) {
        compress(files[i], zipOut, baseDir + dir.getName() + "/");
    }
}

/** 压缩一个文件 */
private static void compressFile(File file, ZipOutputStream zipOut, String baseDir)  throws IOException{
    if (!file.exists()){
        return;
    }

    BufferedInputStream bis = null;
    try {
        bis = new BufferedInputStream(new FileInputStream(file));
        ZipEntry entry = new ZipEntry(baseDir + file.getName());
        zipOut.putNextEntry(entry);
        int count;
        byte data[] = new byte[BUFFER];
        while ((count = bis.read(data, 0, BUFFER)) != -1) {
            zipOut.write(data, 0, count);
        }

    }finally {
        if(null != bis){
            bis.close();
        }
    }
}

将Zip文件加压缩出来，包含所有文件和文件夹到目标目录：

public static void decompress(String zipFile , String dstPath)throws IOException{
    File pathFile = new File(dstPath);
    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 = null;
        OutputStream out = null;
        try{
            in =  zip.getInputStream(entry);
            String outPath = (dstPath+"/"+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;
            }

            out = new FileOutputStream(outPath);
            byte[] buf1 = new byte[1024];
            int len;
            while((len=in.read(buf1))>0){
                out.write(buf1,0,len);
            }
        }
        finally {
            if(null != in){
                in.close();
            }

            if(null != out){
                out.close();
            }
       }
    }
    zip.close();
}

调用示例：

public static void main(String[] args)throws Exception{
    String targetFolderPath = "/Users/fred/zipFile/zipFolder";
    String rawZipFilePath = "/Users/fred/zipFile/raw.zip";
    String newZipFilePath = "/Users/fred/zipFile/new.zip";

    //将Zip文件解压缩到目标目录
    CompressUtil.decompress(rawZipFilePath , targetFolderPath);

    //将目标目录的文件压缩成Zip文件
    CompressUtil.compress(targetFolderPath , newZipFilePath);

}