JSON List,Map前后台解析

最新推荐文章于 2022-10-27 10:40:33 发布

原创最新推荐文章于 2022-10-27 10:40:33 发布 · 326 阅读

CC 4.0 BY-SA版权

本文介绍如何将Java中的List和Map类型数据转换为JSON格式，并提供了从JSON字符串中提取数据的方法。具体包括String类型的List转换及解析、JavaBean类型的List转换及解析、String类型的Map转换及解析、JavaBean类型的Map转换及解析。

1.List:

(1)String类型：

		List listString = new ArrayList();
		listString.add("A1");
		listString.add("A2");
		listString.add("A3");
		listString.add("A4");

		JSONArray json = JSONArray.fromObject(listString);
		System.out.println(json.toString());//["A1","A2","A3","A4"]

	function returnListString(){
		if(myAjaxObject.readyState == 4){
			if(myAjaxObject.status == 200){
				var returnJSONString = myAjaxObject.responseText;
				var returnJSON = JSON.parse(returnJSONString);
				var showString = "";
				for(var i=0; i < returnJSON.length; i++){
					showString = showString + returnJSON[i] + " ";
				}
			}
			alert(showString);
		}
	}

（2）JAVABEAN

		List listBean = new ArrayList();

		UserInfo UserInfo1 = new UserInfo();
		UserInfo1.setUsername("A1");
		UserInfo1.setPassword("密码1");
		UserInfo1.setAge(10);
		UserInfo1.setCreateDate(new SimpleDateFormat("yyyy-MM-dd hh-mm-ss")
				.format(new Date()));
		
		UserInfo UserInfo2 = new UserInfo();
		UserInfo2.setUsername("A2");
		UserInfo2.setPassword("密码2");
		UserInfo2.setAge(10);
		UserInfo2.setCreateDate(new SimpleDateFormat("yyyy-MM-dd hh-mm-ss")
				.format(new Date()));

		listBean.add(UserInfo1);
		listBean.add(UserInfo2);

		JSONArray json = JSONArray.fromObject(listBean);
		System.out.println(json.toString());

//[{"age":10,"createDate":"2017-09-02 08-39-06","password":"密码1","username":"A1"},{"age":10,"createDate":"2017-09-02 08-39-06","password":"密码2","username":"A2"}]

    function retrunListBean(){
                if (myAjaxObject.readyState == 4) {
                    if (myAjaxObject.status == 200) {
                        var returnJSONString = myAjaxObject.responseText;
                        var returnJSON = JSON.parse(returnJSONString);
                        var showString = "";
                        for (var i = 0; i < returnJSON.length; i++) {
                            showString = showString + returnJSON[i].username + " " + returnJSON[i].password + " " + returnJSON[i].age + " " + returnJSON[i].createDate + "-----";
                        }
                        alert(showString);
                    }
                }
            }

2.Map类型

LinkedHashMap mapString = new LinkedHashMap();

		UserInfo UserInfo1 = new UserInfo();
		UserInfo1.setUsername("A1");
		UserInfo1.setPassword("密码1");
		UserInfo1.setAge(10);
		UserInfo1.setCreateDate(new SimpleDateFormat("yyyy-MM-dd hh-mm-ss")
				.format(new Date()));

		UserInfo UserInfo2 = new UserInfo();
		UserInfo2.setUsername("A2");
		UserInfo2.setPassword("密码2");
		UserInfo2.setAge(10);
		UserInfo2.setCreateDate(new SimpleDateFormat("yyyy-MM-dd hh-mm-ss")
				.format(new Date()));

		mapString.put("1", UserInfo1);
		mapString.put("2", UserInfo2);

		JSONArray json = JSONArray.fromObject(mapString);
		System.out.println(json.toString());

[{"1":{"age":10,"createDate":"2017-09-02 08-43-48","password":"密码1","username":"A1"},"2":{"age":10,"createDate":"2017-09-02 08-43-48","password":"密码2","username":"A2"}}]

		function retrunMapBean(){
                if (myAjaxObject.readyState == 4) {
                    if (myAjaxObject.status == 200) {
                        var returnJSONString = myAjaxObject.responseText;
                        var returnJSON = JSON.parse(returnJSONString);
                        var showString = "";
                        for (var i in returnJSON[0]) {
                            showString = showString + "key=" + i + " username=" + returnJSON[0][i].username + " password=" + returnJSON[0][i].password + " age=" + returnJSON[0][i].age + " createDate=" + returnJSON[0][i].createDate + "-----";
                        }
                        alert(showString);
                    }
                }
            }

LinkedHashMap mapString = new LinkedHashMap();
		mapString.put("1", "高洪岩1");
		mapString.put("2", "高洪岩2");
		mapString.put("3", "高洪岩3");
		mapString.put("4", "高洪岩4");
		mapString.put("5", "高洪岩5");

		JSONArray json = JSONArray.fromObject(mapString);
		System.out.println(json.toString());

[{"1":"高洪岩1","2":"高洪岩2","3":"高洪岩3","4":"高洪岩4","5":"高洪岩5"}]

	function retrunMapString(){
                if (myAjaxObject.readyState == 4) {
                    if (myAjaxObject.status == 200) {
                        var returnJSONString = myAjaxObject.responseText;
                        var returnJSON = JSON.parse(returnJSONString);
                        var showString = "";
                        for (var i in returnJSON[0]) {
                            showString = showString + "key=" + i + " value=" + returnJSON[0][i] + " --- ";
                        }
                        alert(showString);
                    }
                }
            }