java对象和json对象之间互相转换详解编程语言

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());         
    } 
}

@RequestMapping("moreBase") 
public ModelAndView moreBase(HttpServletRequest request){ 
     String popWinTableFieldJson = request.getParameter("popWinTableFieldJson"); 
     List<TableField> popWinTableFieldList = (List)JSONArray.toCollection(JSONArray.fromObject(popWinTableFieldJson), TableField.class); 
     return new ModelAndView().addObject("popWinTableFieldList", popWinTableFieldList); 
}