JavaApi实现更新删除及读取节点

/**
     * 三个参数
     * the path of the node
     * the data to set
     * the expected matching version
     */
    Stat stat = zooKeeper.setData("/set/node1", "NODE1".getBytes(), 1);

zooKeeper.setData("/set/node1", "nnn".getBytes(), -1, new AsyncCallback.StatCallback() {
      public void processResult(int rc, String path, Object ctx, Stat stat) {
        System.out.println(rc);//0代表修改成功
        System.out.println(path);//节点路径
        System.out.println(ctx);//上下文参数
        System.out.println(stat);//属性描述对象
      }
    },"ctx");

/**
 * @param path
 *    the path of the node to be deleted.
 * @param version
 *    the expected node version. 当为-1时，表示不考虑当前节点的版本信息。
*/
zooKeeper.delete("/delete/node1",0);

//VoidCallback：异步回调接口
zooKeeper.delete("/delete/node2", -1, new AsyncCallback.VoidCallback() {
  public void processResult(int rc, String path, Object ctx) {
    System.out.println(rc);//0表示删除成功
    System.out.println(path);//节点路径
    System.out.println(ctx);//上下文信息
  }
},"ctx");