java对象和json对象之间互相转换

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());
}
}