JSON的一些操作

喜欢ヅ旅行 2022-09-24 11:21 199阅读 0赞

JSON net.sf.json

1.JAR包简介  
要使程序可以运行必须引入JSON-lib包，JSON-lib包同时依赖于以下的JAR包：

commons-lang.jar  
commons-beanutils.jar  
commons-collections.jar  
commons-logging.jar   
ezmorph.jar  
json-lib-2.2.2-jdk15.jar

2.JSONObject对象使用  
JSON-lib包是一个beans,collections,maps,java arrays 和XML和JSON互相转换的包。在本例中，我们将使用JSONObject类创建JSONObject对象，然后我们打印这些对象的值。为了使用 JSONObject对象，我们要引入"net.sf.json"包。为了给对象添加元素，我们要使用put()方法。  
  
  
2.1.实例1

package jsontest;
    
    import net.sf.json.JSONArray;
    import net.sf.json.JSONObject;
    
    public class JSONObjectSample {
    
        // 创建JSONObject对象
        private static JSONObject createJSONObject() {
            JSONObject jsonObject = new JSONObject();
            jsonObject.put("username", "huangwuyi");
            jsonObject.put("sex", "男");
            jsonObject.put("QQ", "413425430");
            jsonObject.put("Min.score", new Integer(99));
            jsonObject.put("nickname", "梦中心境");
            return jsonObject;
        }
    
        public static void main(String[] args) {
            JSONObject jsonObject = JSONObjectSample.createJSONObject();//静待方法，直接通过类名+方法调用
            // 输出jsonobject对象
            System.out.println("jsonObject：" + jsonObject);
    
            // 判读输出对象的类型
            boolean isArray = jsonObject.isArray();
            boolean isEmpty = jsonObject.isEmpty();
            boolean isNullObject = jsonObject.isNullObject();
            System.out.println("是否为数组:" + isArray + "， 是否为空:" + isEmpty
                    + "， isNullObject:" + isNullObject);
    
            // 添加属性，在jsonObject后面追加元素。
            jsonObject.element("address", "福建省厦门市");
            System.out.println("添加属性后的对象：" + jsonObject);
    
            // 返回一个JSONArray对象
            JSONArray jsonArray = new JSONArray();
            jsonArray.add(0, "this is a jsonArray value");
            jsonArray.add(1, "another jsonArray value");
            jsonObject.element("jsonArray", jsonArray);
            //在jsonObject后面住家一个jsonArray
            JSONArray array = jsonObject.getJSONArray("jsonArray");
            System.out.println(jsonObject);
            
            
            System.out.println("返回一个JSONArray对象：" + array);
            // 添加JSONArray后的值
            // {"username":"huangwuyi","sex":"男","QQ":"413425430","Min.score":99,"nickname":"梦中心境","address":"福建省厦门市","jsonArray":["this is a jsonArray value","another jsonArray value"]}
            System.out.println("结果=" + jsonObject);
    
            // 根据key返回一个字符串
            String username = jsonObject.getString("username");
            System.out.println("username==>" + username);
    
            // 把字符转换为 JSONObject
            String temp = jsonObject.toString();
            JSONObject object = JSONObject.fromObject(temp);
            // 转换后根据Key返回值
            System.out.println("qq=" + object.get("QQ"));
    
        }
    
    }

输出结果

jsonObject：{"username":"huangwuyi","sex":"男","QQ":"413425430","Min.score":99,"nickname":"梦中心境"}
    是否为数组:false， 是否为空:false， isNullObject:false
    添加属性后的对象：{"username":"huangwuyi","sex":"男","QQ":"413425430","Min.score":99,"nickname":"梦中心境","address":"福建省厦门市"}
    {"username":"huangwuyi","sex":"男","QQ":"413425430","Min.score":99,"nickname":"梦中心境","address":"福建省厦门市","jsonArray":["this is a jsonArray value","another jsonArray value"]}
    返回一个JSONArray对象：["this is a jsonArray value","another jsonArray value"]
    结果={"username":"huangwuyi","sex":"男","QQ":"413425430","Min.score":99,"nickname":"梦中心境","address":"福建省厦门市","jsonArray":["this is a jsonArray value","another jsonArray value"]}
    username==>huangwuyi
    qq=413425430

2.2.实例2.

package jsontest;
    
    import net.sf.json.JSONArray;
    import net.sf.json.JSONObject;
    
    public class JSONTest {
        public static void main(String args[])
        {
            JSONObject jsonObj0  = new JSONObject();
            JSONObject jsonObj  = new JSONObject();
            JSONObject jsonObj2  = new JSONObject();
            JSONObject jsonObj3  = new JSONObject();
            JSONArray jsonArray = new JSONArray();
            
            //创建jsonObj0
            jsonObj0.put("name0", "zhangsan");
            jsonObj0.put("sex1", "female");
            System.out.println("jsonObj0:"+jsonObj0);
            
            //创建jsonObj1
            jsonObj.put("name", "xuwei");
            jsonObj.put("sex", "male");
            System.out.println("jsonObj:"+jsonObj);
        
            //创建jsonObj2，包含两个条目，条目内容分别为jsonObj0，jsonObj1
            jsonObj2.put("item0", jsonObj0);
            jsonObj2.put("item1", jsonObj);
            System.out.println("jsonObj2:"+jsonObj2);
            
            //创建jsonObj3，只有一个条目，内容为jsonObj2
            jsonObj3.element("j3", jsonObj2);
            System.out.println("jsonObj3:"+jsonObj3);
        
            //往JSONArray中添加JSONObject对象。发现JSONArray跟JSONObject的区别就是JSONArray比JSONObject多中括号[]
            jsonArray.add(jsonObj);
            System.out.println("jsonArray:"+jsonArray);
            
            JSONObject jsonObj4  = new JSONObject();
            jsonObj4.element("weather", jsonArray);
            System.out.println("jsonObj4:"+jsonObj4);
        }
    }

输出结果：

jsonObj0:{"name0":"zhangsan","sex1":"female"}
    jsonObj:{"name":"xuwei","sex":"male"}
    jsonObj2:{"item0":{"name0":"zhangsan","sex1":"female"},"item1":{"name":"xuwei","sex":"male"}}
    jsonObj3:{"j3":{"item0":{"name0":"zhangsan","sex1":"female"},"item1":{"name":"xuwei","sex":"male"}}}
    jsonArray:[{"name":"xuwei","sex":"male"}]
    jsonObj4:{"weather":[{"name":"xuwei","sex":"male"}]}

关于json对象处理

关于java bean的处理
    
    //创建java对象：
    
    public class Address {
     private String road;
     private String streate;
     private String provience;
     private String no;
     public String getRoad() {
      return road;
     }
     public void setRoad(String road) {
      this.road = road;
     }
     public String getStreate() {
      return streate;
     }
     public void setStreate(String streate) {
      this.streate = streate;
     }
     public String getProvience() {
      return provience;
     }
     public void setProvience(String provience) {
      this.provience = provience;
     }
     public String getNo() {
      return no;
     }
     public void setNo(String no) {
      this.no = no;
     }
    }
    
    //1.将json对象转化为java对象
    
     JSONObject jsonObject = JSONObject.fromObject("{\"no\":\"104\",\"provience\":\"陕西\",\"road\":\"高新路\",\"streate\":\"\"}");
      Address Address  = (Address) JSONObject.toBean(jsonObject,Address.class);
      log.info(Address.getNo());
      log.info(Address.getStreate());
      log.info(Address.getProvience());
      log.info(Address.getRoad());
    
     
    
    //2.将java对象转化为json对象
    
       //将java对象转化为json对象：
    
        Address address = new Address();
        address.setNo("104");
        address.setProvience("陕西");
        address.setRoad("高新路");
        address.setStreate("");
        JSONArray json = JSONArray.fromObject(address);
        log.info(json.toString());
    
     
    
      //将java对象list转化为json对象：
    
      Address address = new Address();
      address.setNo("104");
      address.setProvience("陕西");
      address.setRoad("高新路");
      address.setStreate("");
      Address address2 = new Address();
      address2.setNo("105");
      address2.setProvience("陕西");
      address2.setRoad("未央路");
      address2.setStreate("张办");
      List list = new ArrayList();
      list.add(address);
      list.add(address2);
      JSONArray json = JSONArray.fromObject(list);
      log.info(json.toString());
    
    //3.JSONArray转化为list
    
    JSONObject jsonObject = JSONObject.fromObject("{\"no\":\"104\",\"provience\":\"陕西\",\"road\":\"高新路\",\"streate\":\"\"}");
      JSONArray jsonArray = new JSONArray();
      jsonArray.add("{\"no\":\"104\",\"provience\":\"陕西\",\"road\":\"高新路\",\"streate\":\"\"}");
      jsonArray.add("{\"no\":\"104\",\"provience\":\"陕西\",\"road\":\"高新路\",\"streate\":\"123\"}");
      Object object = JSONArray.toList(jsonArray,Address.class);