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); 
}