ajax与json

朱雀 2023-06-01 12:50 179阅读 0赞

### 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);

转载于:https://www.cnblogs.com/itzlg/p/11318799.html