JSON 介绍json-lib使用

阳光穿透心脏的1/2处 2024-02-17 18:05 48阅读 0赞

一、 JSON-lib包是一个beans,collections,maps,java arrays 和XML和JSON互相转换的包，主要就是用来解析Json数据，

在其官网[http://www.json.org/上][http_www.json.org]有详细讲解。

**二、下载jar依赖包：\[链接: http://pan.baidu.com/s/1o88OIIu 密码: 4ggm\]**

**![Center][]**

**三、具体使用**

/*
    	 * (1)Bean转换成JSONObject
    	 */
    	private static void getBeanToJSONObject() {
    		// Student对象
    		Student student = new Student("肥肥", "男", 25);
    		// Bean转换成json代码
    		JSONObject object = JSONObject.fromObject(student);
    
    		System.out.println(object.toString());
    	}
    
    	/*
    	 * (2) 一般将数组数据转换成JSONArray
    	 */
    	private static void getDataToJSONArray() {
    
    		JSONArray object = JSONArray.fromObject("['A','B','C']");
    
    		System.out.println(object.toString());
    	}
    
    	/*
    	 * (3) 数组转换成JSONArray
    	 */
    	private static void getArrayToJSONArray() {
    
    		int[] arr = new int[] { 100, 200, 300, 400 };
    		JSONArray object = JSONArray.fromObject(arr);
    		System.out.println(object.toString());
    	}
    
    	/*
    	 * (4) List转换成JSONArray
    	 */
    	private static void getListToJSONArray() {
    
    		String[] arr = new String[] { "zhang", "john", "mike" };
    		List list = Arrays.asList(arr);
    		JSONArray object = JSONArray.fromObject(arr);
    		System.out.println(object.toString());
    	}
    
    	/*
    	 * (5) Map转换成JSONArray
    	 */
    	private static void getMapToJSONArray() {
    
    		Map map = new HashMap();
    		map.put("uname", "张三");
    		map.put("bool", true);
    		map.put("string", new String[] { "x", "y" });
    		JSONArray object = JSONArray.fromObject(map);
    		System.out.println(object.toString());
    	}
    
    	/*
    	 * (6) Map转换成JSONArray
    	 */
    	private static void getMapsToJSONArray() {
    
    		// map对象
    		Map<String, String> map = new HashMap<String, String>();
    		map.put("name", "john");
    		map.put("sex", "男");
    		map.put("age", "20");
    
    		Map<String, String> map1 = new HashMap<String, String>();
    		map1.put("name", "zhang");
    		map1.put("sex", "女");
    		map1.put("age", "21");
    
    		List<Map> list = new ArrayList<Map>();
    		list.add(map);
    		list.add(map1);
    
    		JSONArray object = JSONArray.fromObject(list);
    		System.out.println(object.toString());
    	}
    
    	/*
    	 * (7) List与Student转换成JSONArray
    	 */
    	private static void getListAndToJSONArray() {
    
    		// map对象
    		Map<String, String> map = new HashMap<String, String>();
    		map.put("name", "john");
    		map.put("sex", "男");
    		map.put("age", "20");
    
    		Map<String, String> map1 = new HashMap<String, String>();
    		map1.put("name", "zhang");
    		map1.put("sex", "女");
    		map1.put("age", "21");
    
    		List<Map> list = new ArrayList<Map>();
    		list.add(map);
    		list.add(map1);
    
    		// Student对象
    		Student student = new Student("肥肥", "男", 25);
    		
    		 // 将List转换为JSONArray数据
            JSONArray jaList = JSONArray.fromObject(list);
            
            // 将Bean转换为JSONArray数据
            JSONArray jaStudent = JSONArray.fromObject(student);
    
    
    	   // JSON格式数据解析对象
            JSONObject jsonObject = new JSONObject();
            //存入数据
            jsonObject.put("list", jaList);
            jsonObject.put("stu", jaStudent);
            
            //解析 通过Key==》获得值
    //        JSONArray array =jsonObject.getJSONArray("list");
            
    		
    		System.out.println(jsonObject.toString());
    	}

[http_www.json.org]: http://www.json.org/
[Center]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/7758484a1fe44e5ea630c4184a2ce828.png