java创建zip文件

public String createZip(String zipFileName,List<String> fileList,String speSymbols){

    ZipOutputStream out = null;
    File zipFile = new File(zipFileName);
    try {
      if(!zipFile.exists()){
        zipFile.createNewFile();
      }else{
        zipFile.delete();
        zipFile.createNewFile();
      }
      out = new ZipOutputStream(new FileOutputStream(zipFile));

      for(String filePath: fileList){
        File file = new File(filePath);
        ZipEntry ent = new ZipEntry(file.getName());
        FileInputStream ins = new FileInputStream (file);
        out.putNextEntry(ent);
        int b = 0;
        while((b=ins.read())!=-1){
          out.write(b);
        }
        ins.close();

      }

      out.close();

    } catch (Exception e) {
      // TODO: handle exception
      e.printStackTrace();
    }



    return null;
  }