java对象和json对象之间互相转换例子

叁歲伎倆 2022-07-28 11:53 200阅读 0赞

import java.util.ArrayList;  
        import java.util.Collection;  
        import java.util.Iterator;  
        import java.util.List;  
    
        import net.sf.json.JSONArray;  
        import net.sf.json.JSONObject;  
    
        public class MainClass {   
    
            public static void main(String[] args) {  
                TestJsonBean();  
                TestJsonAttribute();  
                TestJsonArray();          
            }  
    
            @SuppressWarnings("rawtypes")  
            private static void TestJsonArray() {  
                Student student1 = new Student();  
                student1.setId(1);  
                student1.setName("jag");  
                student1.setSex("man");  
                student1.setAge(25);  
                student1.setHobby(new String[]{
       "篮球","游戏"});  
    
                Student student2 = new Student();  
                student2.setId(2);  
                student2.setName("tom");  
                student2.setSex("woman");  
                student2.setAge(23);  
                student2.setHobby(new String[]{
       "上网","跑步"});  
    
                List<Student> list = new ArrayList<Student>();  
                list.add(student1);  
                list.add(student2);  
    
                JSONArray jsonArray = JSONArray.fromObject(list);  
                System.out.println(jsonArray.toString());  
    
                JSONArray new_jsonArray=JSONArray.fromObject(jsonArray.toArray());  
                Collection java_collection=JSONArray.toCollection(new_jsonArray);  
                if(java_collection!=null && !java_collection.isEmpty())  
                {  
                    Iterator it=java_collection.iterator();  
                    while(it.hasNext())  
                    {  
                        JSONObject jsonObj=JSONObject.fromObject(it.next());  
                        Student stu=(Student) JSONObject.toBean(jsonObj,Student.class);  
                        System.out.println(stu.getName());  
                    }  
                }  
            }  
    
            private static void TestJsonAttribute() {  
                /** * 创建json对象并为该对象设置属性 */  
                JSONObject jsonObj = new JSONObject();  
                jsonObj.put("Int_att",25);//添加int型属性 
                jsonObj.put("String_att","str");//添加string型属性 
                jsonObj.put("Double_att",12.25);//添加double型属性 
                jsonObj.put("Boolean_att",true);//添加boolean型属性 
                //添加JSONObject型属性 
                JSONObject jsonObjSon = new JSONObject();  
                jsonObjSon.put("id", 1);  
                jsonObjSon.put("name", "tom");  
                jsonObj.put("JSONObject_att",jsonObjSon);  
                //添加JSONArray型属性 
                JSONArray jsonArray = new JSONArray();  
                jsonArray.add("array0");  
                jsonArray.add("array1");  
                jsonArray.add("array2");  
                jsonArray.add("array3");  
                jsonObj.put("JSONArray_att", jsonArray);  
                System.out.println(jsonObj.toString());  
                System.out.println("Int_att:"+jsonObj.getInt("Int_att"));  
                System.out.println("String_att:"+jsonObj.getString("String_att"));  
                System.out.println("Double_att:"+jsonObj.getDouble("Double_att"));  
                System.out.println("Boolean_att:"+jsonObj.getBoolean("Boolean_att"));  
                System.out.println("JSONObject_att:"+jsonObj.getJSONObject("JSONObject_att"));  
                System.out.println("JSONArray_att:"+jsonObj.getJSONArray("JSONArray_att"));  
            }  
    
            /** * java对象与json对象互相转换 */  
            private static void TestJsonBean() {  
                /** * 创建java对象 */  
                Student student = new Student();  
                student.setId(1);  
                student.setName("jag");  
                student.setSex("man");  
                student.setAge(25);  
                student.setHobby(new String[]{
       "篮球","上网","跑步","游戏"});  
                /** * java对象转换成json对象，并获取json对象属性 */  
                JSONObject jsonStu = JSONObject.fromObject(student);  
                System.out.println(jsonStu.toString());  
                System.out.println(jsonStu.getJSONArray("hobby"));  
                /** * json对象转换成java对象，并获取java对象属性 */  
                Student stu = (Student) JSONObject.toBean(jsonStu, Student.class);  
                System.out.println(stu.getName());  
                /** * 创建json对象 */  
                JSONObject jsonObj = new JSONObject();  
                jsonObj.put("id",1);  
                jsonObj.put("name","张勇");  
                jsonObj.put("sex","男");  
                jsonObj.put("age",24);  
                //jsonObj.put("hobby",new String[]{"上网","游戏","跑步","音乐"}); 
                //System.out.println(jsonObj.toString()); 
                /** * json对象转换成java对象 */  
                Student stud = (Student) JSONObject.toBean(jsonObj,Student.class);  
                System.out.println(stud.getName());       
            }  
        }