ajax与json总结

1.jquery中调用ajax方法

$.ajax({

  async:true,

  type:"post",

  url:"xxxServlet",

  data:{"account":"jack","pwd":"123"},

  success:function(data){

      //dowork

  },

  //error:function(){alert("error!");},

  dataType:"json"

});

注:指定dataType为json时,不要用var obj = eval("("+data+")");去再次解析,会报错

2.json格式

1.json对象

  {key:value,key:value}

  {"name":"jack","sex":"男","age":"25"}

2.json数组或集合格式

  [{key:value,key:value},{key:value,key:value}]

  [{"name":"jack","sex":"男","age":"25"},     {"name":"tom","sex":"男","age":"26"}]

3.json对象,数组嵌套

  {

        "param":[{key:value,key:value},{key:value,key:value}]

  }

  {

	"param1":[{key:value,key:value},{key:value,key:value}],

	"param2":[{key:value,key:value},{key:value,key:value}],

	"param3":[{key:value,key:value},{key:value,key:value}]

  }

  {

	 "param1":"value1",

	 "param2":{},

	 "param3":[{key:value,key:value},{key:value,key:value}]

  }

3.谷歌的gson包

  Gson gson = new Gson();

  String json = gson.toJson(car);

  resp.getWriter().write(json);

4.阿里的fastjson包

JSON-jsonString(toJOSNString)

JSONObject-map集合(put)

JSONArray-list集合(add)

4.1.响应jsonString

String jsonString = JSON.toJSONString(car);

resp.getWriter().write(jsonString);

4.2.响应json对象

JSONObject data=JSONObject.parseObject(JSON.toJSONString(car));

resp.getWriter().print(data);

4.3.JSONObject对象

JSONObject jo = new JSONObject();

jo.put("message", "用户名可注册!");

resp.getWriter().print(jo);

4.4.JSONArray数组

JSONObject jo1 = new JSONObject();

JSONObject jo2 = new JSONObject();

JSONArray ja = new JSONArray();

ja.add(jo1);

ja.add(jo2);

resp.getWriter().println(ja);

巴特西

ajax与json总结

1.jquery中调用ajax方法

2.json格式

3.谷歌的gson包

4.阿里的fastjson包

4.1.响应jsonString

4.2.响应json对象

4.3.JSONObject对象

4.4.JSONArray数组

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