java对象和json对象之间互相转换

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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());

}

}