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

/*
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 * 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

/*
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 * 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() { // 1
        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() { //3
        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() { // 4
        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() { // 5
        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。