code: public static long writeAndClose(Writer writer, Reader reader) {
          try {
              return write(writer, reader);
          }
          catch (IOException e) {
              throw Lang.wrapThrow(e);
          }
          finally {
              safeClose(writer);
              safeClose(reader);
          }
      }
docs: 将文本输入流写入一个文本输出流。块大小为 8192
  <p>
  <b style=color:red>注意</b>，它会关闭输入/出流
  
  @param writer
  输出流
  @param reader
  输入流