json : json数据解析（一）

在项目中经常用到json格式的数据转换与解析，先前写过一些小例子，现在整理下，以备后用和帮助后来者。

言归正传：

使用到的jar包 ：json-lib-2.4-jdk15.jar，当然你也可以用自己版本的，一般都没啥问题。

一、用于测试数据的类：

1.Student

 /*
  * To change this template, choose Tools | Templates
  * and open the template in the editor.
  */
 package com.json.gson;

 import java.util.List;

 /**
  * gsonTest测试类 ： 学生
  *
  * @author zhengze.su
  */
 public class Student {

     private String name;
     private String sex;
     private int age;
     private String address;
     private List<Hobby> hobbyList;
     private List<Course> courseList;

     /**
      * @return the name
      */
     public String getName() {
         return name;
     }

     /**
      * @param name the name to set
      */
     public void setName(String name) {
         this.name = name;
     }

     /**
      * @return the sex
      */
     public String getSex() {
         return sex;
     }

     /**
      * @param sex the sex to set
      */
     public void setSex(String sex) {
         this.sex = sex;
     }

     /**
      * @return the age
      */
     public int getAge() {
         return age;
     }

     /**
      * @param age the age to set
      */
     public void setAge(int age) {
         this.age = age;
     }

     /**
      * @return the address
      */
     public String getAddress() {
         return address;
     }

     /**
      * @param address the address to set
      */
     public void setAddress(String address) {
         this.address = address;
     }

     /**
      * @return the hobbyList
      */
     public List<Hobby> getHobbyList() {
         return hobbyList;
     }

     /**
      * @param hobbyList the hobbyList to set
      */
     public void setHobbyList(List<Hobby> hobbyList) {
         this.hobbyList = hobbyList;
     }

     /**
      * @return the courseList
      */
     public List<Course> getCourseList() {
         return courseList;
     }

     /**
      * @param courseList the courseList to set
      */
     public void setCourseList(List<Course> courseList) {
         this.courseList = courseList;
     }
 }

2.Hobby

 /*
  * To change this template, choose Tools | Templates
  * and open the template in the editor.
  */
 package com.json.gson;

 /**
  * gsonTest测试类 ： 爱好
  *
  * @author zhengze.su
  */
 public class Hobby {

     private String hobbyName;

     /**
      * @return the hobbyName
      */
     public String getHobbyName() {
         return hobbyName;
     }

     /**
      * @param hobbyName the hobbyName to set
      */
     public void setHobbyName(String hobbyName) {
         this.hobbyName = hobbyName;
     }
 }

3.Course

 /*
  * To change this template, choose Tools | Templates
  * and open the template in the editor.
  */
 package com.json.gson;

 /**
  * gsonTest测试类 ： 课程
  *
  * @author zhengze.su
  */
 public class Course {

     private String teacherName;
     private String courseName;

     /**
      * @return the teacherName
      */
     public String getTeacherName() {
         return teacherName;
     }

     /**
      * @param teacherName the teacherName to set
      */
     public void setTeacherName(String teacherName) {
         this.teacherName = teacherName;
     }

     /**
      * @return the courseName
      */
     public String getCourseName() {
         return courseName;
     }

     /**
      * @param courseName the courseName to set
      */
     public void setCourseName(String courseName) {
         this.courseName = courseName;
     }
 }

4.Person

 /*
  * To change this template, choose Tools | Templates
  * and open the template in the editor.
  */
 package com.json.gson;

 /**
  *
  * @author Administrator
  */
 public class Person {

     private String name;
     private String age;
     private String hobby;

     /**
      * @return the name
      */
     public String getName() {
         return name;
     }

     /**
      * @param name the name to set
      */
     public void setName(String name) {
         this.name = name;
     }

     /**
      * @return the age
      */
     public String getAge() {
         return age;
     }

     /**
      * @param age the age to set
      */
     public void setAge(String age) {
         this.age = age;
     }

     /**
      * @return the hobby
      */
     public String getHobby() {
         return hobby;
     }

     /**
      * @param hobby the hobby to set
      */
     public void setHobby(String hobby) {
         this.hobby = hobby;
     }
 }

5.模拟获取数据

 /*
  * To change this template, choose Tools | Templates
  * and open the template in the editor.
  */
 package com.json.gson;

 import java.util.ArrayList;
 import java.util.List;

 /**
  * 获取模拟数据
  *
  * @author Administrator
  */
 public class GetDataUtil {

     /**
      * 获取hobbyList
      *
      * @return
      */
     public List<Hobby> getHobbyList() {
         List<Hobby> hobbyList = new ArrayList<Hobby>();
         Hobby hobby = null;
         for (int i = 0; i <= 2; i++) {
             hobby = new Hobby();
             hobby.setHobbyName("爱好(" + i + 1 + ")");
             hobbyList.add(hobby);
         }

         return hobbyList;
     }

     /**
      * 获取courseList
      *
      * @return
      */
     public List<Course> getCourseList() {
         List<Course> courseList = new ArrayList<Course>();
         Course course = null;
         for (int i = 0; i <= 0; i++) {
             course = new Course();
             course.setCourseName("课程" + (i + 1));
             course.setTeacherName("老师" + (i + 1));
             courseList.add(course);
         }

         return courseList;
     }

     public List<Student> getStudentList() {

         List<Student> studentList = new ArrayList<Student>();
         List<Hobby> hobbyList = this.getHobbyList();
         List<Course> courseList = this.getCourseList();
         Student student = null;
         for (int i = 0; i <= 0; i++) {
             student = new Student();
             student.setName("学生" + (i + 1));
             if (i % 2 == 0) {
                 student.setSex("男");
             } else {
                 student.setSex("女");
             }
             student.setAge(i + 10);
             student.setHobbyList(hobbyList);
             student.setCourseList(courseList);
             studentList.add(student);
         }

         return studentList;

     }
 }

二、gsonTest测试类 ： 方法类

 /*
  * To change this template, choose Tools | Templates
  * and open the template in the editor.
  */
 package com.json.gson;

 import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.List;
 import net.sf.json.JSONArray;
 import net.sf.json.JSONObject;
 import net.sf.json.JSONSerializer;
 import net.sf.json.JsonConfig;

 /**
  * gsonTest测试类 ： 方法类
  *
  * @author zhengze.su
  */
 public class GsonTest001 {

 //    //获取模拟数据
 //    public void getData() {
 //        GetDataUtil dataUtil = new GetDataUtil();
 //        List<Student> studentList = dataUtil.getStudentList();
 //        System.out.println("studentList.size():"+studentList.size());
 //    }

     //1. list对象转换成json字符串
     // 备注 ：此处只是将 student 对象转换成了 json字符串，后面将利用此处的数据，将其转换为对应的对象
     public void studentListToJson() {
         GetDataUtil dataUtil = new GetDataUtil();
         List<Student> studentList = dataUtil.getStudentList();
         JSONArray jsonArray = JSONArray.fromObject(studentList);
         System.out.println(jsonArray);
     }

     //2. json字符串转list输出，类型为 String
     public void jsonStrToList() {
         String jsonStr = "[\"aa1\",\"bb2\",\"cc3\",\"dd4\"]";
         JSONArray jsonArray = (JSONArray) JSONSerializer.toJSON(jsonStr);
         System.out.println("出来吧，皮卡丘:" + jsonArray);
         List<String> strList = (List) JSONSerializer.toJava(jsonArray);
         for (String s : strList) {
             System.out.println("打印出来看一看吆：" + s);
         }
     }

     //////// json 字符串 转为 对象，例子比较简单，主要是区分一下不同的形式
     /////// 关于此处提到了 JsonConfig() ，后面再写个关于其配置的小例子
     //3. json字符串转对象，以 person类为例
     public void testJsonList1() { //
         String json = "[{'name':'ml','age':'24','hobby':'eat'},{'name':'aarn','age':'25','hobby':'play'},{'name':'su','age':'xx','hobby':'study'}]";
         JSONArray jsonarray = JSONArray.fromObject(json);
         System.out.println(jsonarray);
         List list = (List) JSONArray.toCollection(jsonarray, Person.class);//person类
         Iterator ite = list.iterator();
         while (ite.hasNext()) {
             Person pp = (Person) ite.next();
             System.out.println(pp.getName());
         }
     }

     //4. json字符串转对象，以 person类为例
     public void testJsonList2() {  //2
         String json = "[{'name':'ml','age':'24','hobby':'eat'},{'name':'aarn','age':'25','hobby':'play'},{'name':'su','age':'xx','hobby':'study'}]";
         JSONArray jsonarray = JSONArray.fromObject(json);
         System.out.println(jsonarray);
         List list = (List) JSONArray.toList(jsonarray, Person.class);
         Iterator iter = list.iterator();
         while (iter.hasNext()) {
             Person ppp = (Person) iter.next();
             System.out.println(ppp.getHobby());
         }
     }

     //5. json字符串转对象，以 person类为例
     public void testJsonList3() { //
         String json = "[{'name':'ml','age':'24','hobby':'eat'},{'name':'aarn','age':'25','hobby':'play'},{'name':'su','age':'xx','hobby':'study'}]";
         JSONArray jsonarray = JSONArray.fromObject(json);
         System.out.println(jsonarray);
         List list = JSONArray.toList(jsonarray, new Person(), new JsonConfig());
         Iterator itera = list.iterator();
         while (itera.hasNext()) {
             Person pe = (Person) itera.next();
             System.out.println(pe.getAge());
         }
     }

     //6. json字符串转对象，以 person类为例
     public void testJsonList4() { //
         String json = "[{'name':'su','age':'25','hobby':'play'},{'name':'wa','age':'24','hobby':'eat'},{'name':'s','age':'aa','hobby':'mm'}]";
         JSONArray jsonarray = (JSONArray) JSONSerializer.toJSON(json);
         System.out.println(jsonarray);
         List list = (List) JSONSerializer.toJava(jsonarray);
         for (Object obj : list) {
             JSONObject jbj = JSONObject.fromObject(obj);
             Person p = (Person) JSONObject.toBean(jbj, Person.class);
             System.out.println(p.getName());
         }
     }

     //7. json字符串转对象，以 person类为例
     public void testJsonList5() { //
         String json = "[{'name':'su','age':'25','hobby':'play'},{'name':'wa','age':'24','hobby':'eat'},{'name':'s','age':'aa','hobby':'mm'}]";
         JSONArray jsonarray = (JSONArray) JSONSerializer.toJSON(json);
         System.out.println(jsonarray);
         List list = (List) JSONSerializer.toJava(jsonarray);
         Iterator ite = list.iterator();
         while (ite.hasNext()) {
             JSONObject jsonObject = JSONObject.fromObject(ite.next());
             Person pp = (Person) JSONObject.toBean(jsonObject, Person.class);
             System.out.println(pp.getName());
         }
     }

     public static void main(String[] args) {
         GsonTest001 gsonTest001 = new GsonTest001();
 //        gsonTest001.getData();
 //        gsonTest001.studentListToJson();
 //        gsonTest001.jsonStrToList();
 //        gsonTest001.testJsonList1();
 //        gsonTest001.testJsonList2();
 //        gsonTest001.testJsonList3();
 //        gsonTest001.testJsonList4();
 //        gsonTest001.testJsonList5();

     }
 }

下一篇将代码注释中提到的未完成的部分，包括解析 对象存在多个属性（包含集合属性）、jsonConfig()的简单使用、某个童鞋给的一份json数据的情况(据说是挺复杂的)，在后面的文章中一一分享给大家。