code: public static long writeAndClose(OutputStream ops, InputStream ins) {
          try {
              return write(ops, ins);
          }
          catch (IOException e) {
              throw Lang.wrapThrow(e);
          }
          finally {
              safeClose(ops);
              safeClose(ins);
          }
      }
docs: 将输入流写入一个输出流。块大小为 8192
  <p>
  <b style=color:red>注意</b>，它会关闭输入/出流
  
  @param ops
  输出流
  @param ins
  输入流
  @return 写入的字节数