随便写的

    /**
     * 解压zip文件
     * 
     * TODO 压缩包内文件有中文会出错
     * 
     * @param zipFileStream zip文件流
     * @param targetPath 解压路径
     * @throws IOException 
     */
    public static void unZip(InputStream zipFileStream, String targetPath) throws IOException{
        ZipInputStream zipInputStream = null;
        try {
            // 构造zipInputStream
            zipInputStream= new ZipInputStream(zipFileStream);
            ZipEntry zipEntry = zipInputStream.getNextEntry();
            while(zipEntry != null){
                // 如果目录
                if (zipEntry.getName().endsWith("/") || zipEntry.getName().endsWith("\\")){
                    File dir = new File(targetPath +
                    zipEntry.getName().substring(0,zipEntry.getName().length()-1));
                    if (!dir.exists()){
                        dir.mkdirs();
                    }
                }else {
                    // 是文件
                    File tmp = new File(targetPath+zipEntry.getName());
                    if (!tmp.exists()){
                        // 先判断父路径是否存在
                        tmp.getParentFile().mkdirs();
                        // 输出流生成新文件
                        OutputStream outputStream = new FileOutputStream(tmp);
                        byte[] buf = new byte[102400];
                        int n=0;
                        while((n=zipInputStream.read(buf))!= -1){
                            outputStream.write(buf, 0, n);
                            outputStream.flush();
                        }
                        outputStream.close();
                    }
                }
                zipInputStream.closeEntry();
                zipEntry = zipInputStream.getNextEntry();
            }

        } finally {
            // 关闭流
            if (zipInputStream != null) {
                try {
                    zipInputStream.close();
                } catch (IOException e) {
                    
                }
            }
        }
    }