注解类型 Cleanup

确保您注解的变量声明将在任何情况下通过调用其 close 方法进行清理。 通过将局部变量声明之后到作用域结束的所有语句包装到一个 try 代码块中来实现，该代码块作为 finally 操作关闭资源。

完整文档请见 @Cleanup 的 project lombok 功能页面。

示例

 public void copyFile(String in, String out) throws IOException {
     @Cleanup FileInputStream inStream = new FileInputStream(in);
     @Cleanup FileOutputStream outStream = new FileOutputStream(out);
     byte[] b = new byte[65536];
     while (true) {
         int r = inStream.read(b);
         if (r == -1) break;
         outStream.write(b, 0, r);
     }
 }
 

将生成

 public void copyFile(String in, String out) throws IOException {
     @Cleanup FileInputStream inStream = new FileInputStream(in);
     try {
         @Cleanup FileOutputStream outStream = new FileOutputStream(out);
         try {
             byte[] b = new byte[65536];
             while (true) {
                 int r = inStream.read(b);
                 if (r == -1) break;
                 outStream.write(b, 0, r);
             }
         } finally {
             if (outStream != null) outStream.close();
         }
     } finally {
         if (inStream != null) inStream.close();
     }
 }