java对象与json对象之间互相转换实现方法示例

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());  }}