Struts2 返回JSON数据方法（二）使用JSONObject

这种方式需要在action中用到Response。但是我有一个疑问，在struts2的action中用到response好吗？是不是应尽量不用？

需要导入的jar包ezmorph-1.0.6.jar

action代码：

public class LoginAction extends ActionSuppor{

    //将要被Struts2序列化为JSON字符串的对象    
    Map<String, Object> message;
    public Map<String, Object> getMessage() {
        return message;
    }

    public void setMessage(Map<String, Object> message) {
        this.message = message;
    }

    //验证登陆
    public String loginTch() {
        message = new HashMap<String, Object>();

        //省略用户名密码的判断......
        message.put("loginError", "密码错误！");
        //将封装的信息转成JSON数据传入前台
        PrintWriter writer;    
        HttpServletResponse response = ServletActionContext.getResponse();
        response.setCharacterEncoding("UTF-8");
        try {
            writer = response.getWriter();//将内容输出到response
            String json = YHJSONUtil.serialize(message);
            writer.write(json);
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return SUCCESS;
}

jsp页面代码：

<head>
<script src="js/jquery.js" type="text/javascript"></script>
<script type="text/javascript">
  function doSubmit() {
    $.ajax({
    type: "GET",
    url: "loginAction",
    dataType: "json",
    cache: false,
    success: function(data) {
      $.each(data, function(key, val) {
        if (key == "loginError" && val != ''){
          $("#mes").html(val);
            return false;
        }
      });
    }
  });
  }
</script>
</head>
<body>
  <div id="mes">
  </div>
  <!-- 省去用户名密码输入 -->
  <button type="button" onlick="doSubmit()">提交</button>
</body>

不需要在struts.xml中配置

posted @ 2012-10-26 11:05  Ars_blog  阅读(875)  评论(0)    收藏  举报