servlet中处理json

使用fastJson

<dependency>
  <groupId>com.alibaba</groupId>
  <artifactId>fastjson</artifactId>
  <version>1.2.28</version>
</dependency>

1.get json数据

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    //封装数据
    User u = new User();
    u.setUid(1);
    u.setUserName("lwx");

    DataObject dataObject = new DataObject();
    dataObject.setId(1);
    dataObject.setMessage("data");
    Date date = new Date();
    dataObject.setDate(date);
    dataObject.setUser(u);
    /**
     * date类型直接转json是毫秒形式
     *  1、后端处理 JSONConfig
     *  2. js处理 date = new Date(date).toLocaleString();
     */
    String json = JSON.toJSONString(dataObject);
    System.out.println(json);
    resp.setContentType("text/json;charset=utf-8");
    resp.getWriter().write(json);
}

前端ajax获取的date是毫秒数，js转化一下

$.ajax({
    url : 'test',
    type : 'get',
    success(res){
        console.log(res);
        res.date = new Date(res.date).toLocaleString();
        console.log(res.date)
    }
})

2. post json数据

@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    BufferedReader reader = req.getReader();
    String jsonStr = reader.readLine();
    JSONObject data=JSONObject.parseObject(jsonStr);
    reader.close();
    int id = data.getInteger("id");
    String message = data.getString("message");
    Date date = data.getDate("date");
    System.out.println(id + " " + message + " " + date);
}

$("#btn").click(function (){
    var date = new Date();
    console.log(date);
    var list = {
        id : 1,
        message : "str",
        date : date
    }
    $.ajax({
        url : '/test',
        type : 'post',
        contentType : "application/json",
        dataType : "json",
        data : JSON.stringify(list),
        success(res){

        }
    })
})