result : xml格式的字符串
SAXBuilder build = new SAXBuilder();
1.先将xml格式字符串转化成document对象
Document doc = build.build(new StringReader(result));
2.获取document对象所有节点
Element root = doc.getRootElement();
3.获取节点中名字为AgentDetailNew的节点对象
Element element = root.getChild("AgentDetailNew");
4.获取AgentDetailNew节点下 buserid 节点的值:
String buserid = element.getChild("buserid").getText();
5.将次节点的值设置为111
element.getChild("buserid").setText("1111");