json解析

public class MyJson {
    /**
     * 解析简单的json字符串
     */
    public static final String JSON_SIMPLE = "{'name':'tom','age':16}";
    public static void parseJson(){
        JSONObject obj = JSONObject.fromObject(JSON_SIMPLE);
        System.out.println("name is : " + obj.get("name"));
        System.out.println("age is : " + obj.get("age"));
    }

    /**
     * 解析嵌套的json字符串
     */
    public static final String JSON_SIMPLE1="{'name':'tom','score':{'Math':98," +
            "'English':90}}";
    public static void parseJson1(){
        JSONObject obj=JSONObject.fromObject(JSON_SIMPLE1);
        System.out.println("name is: "+obj.get("name"));
        System.out.println("score is:"+obj.get("score"));
        JSONObject scoreObj=(JSONObject)obj.get("score");
        System.out.println("Math score is :"+scoreObj.get("Math"));
        System.out.println("English score is :"+scoreObj.get("English"));
    }

    /**
     *把Bean对象转化成JSONObject对象
     */
    public static void parseJson2(){
        Score score=new Score();
        score.setEnglish("A");
        score.setMath("B");

        Info info=new Info();
        info.setAge(20);
        info.setScore(score);

        Person person=new Person();
        person.setInfo(info);
        person.setName("Tim");
        JSONObject obj=JSONObject.fromObject(person);
        System.out.println(obj.toString());
    }

    /**
     *把json数组转化成jsonObject数组
     */
    public static final String JSON_ARRAY="[{'name':'tom'}," +
            "{'name':'john','age':20},{}]";
    public static  void parseJson3(){
        JSONArray arr=JSONArray.fromObject(JSON_ARRAY);
        System.out.println(arr);
        for(int i=0;i<arr.size();i++){
            JSONObject obj=arr.getJSONObject(i);
            System.out.println(obj.toString());
        }
    }

    /**
     * 构造一个json字符串
     */
    public static void parseJson4(){
        JSONObject obj=new JSONObject();
        obj.put("name","tom");
        obj.put("age",19);
        //子对象
        JSONObject jsonObject=new JSONObject();
        jsonObject.put("tel","123456");
        jsonObject.put("email","[e-mail]");
        obj.put("contact",jsonObject);
        //子数组对象
        JSONArray scoreArr=new JSONArray();
        JSONObject objEnglish=new JSONObject();
        objEnglish.put("course","english");
        objEnglish.put("result",100);
        objEnglish.put("level","A");

        JSONObject objMath=new JSONObject();
        objMath.put("course","math");
        objMath.put("result",50);
        objMath.put("level","D");
        scoreArr.add(objEnglish);
        scoreArr.add(objMath);
        obj.put("score",scoreArr);
        System.out.println(obj.toString());
    }
    public static void main(String[] args){
        System.out.println("parseJson():");
        parseJson();
        System.out.println();
        System.out.println("parseJson()1:");
        parseJson1();
        System.out.println();
        System.out.println("parseJson()2:");
        parseJson2();
        System.out.println();
        System.out.println("parseJson()3:");
        parseJson3();
        System.out.println();
        System.out.println("parseJson()4:");
        parseJson4();
    }
}
相关类：
public class Score {
    private String math;
    private String english;

    public String getEnglish() {
        return english;
    }

    public void setEnglish(String english) {
        this.english = english;
    }

    public String getMath() {

        return math;
    }

    public void setMath(String math) {
        this.math = math;
    }
}public class Info {
    private int age;
    private Score score;

    public Score getScore() {
        return score;
    }

    public void setScore(Score score) {
        this.score = score;
    }

    public int getAge() {

        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}public class Person {
    private String name;
    private Info info;

    public Info getInfo() {
        return info;
    }

    public void setInfo(Info info) {
        this.info = info;
    }

    public String getName() {

        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}parseJson():
name is : tom
age is : 16

parseJson()1:
name is: tom
score is:{"English":90,"Math":98}
Math score is :98
English score is :90

parseJson()2:
{"name":"Tim","info":{"score":{"english":"A","math":"B"},"age":20}}

parseJson()3:
[{"name":"tom"},{"name":"john","age":20},{}]
{"name":"tom"}
{"name":"john","age":20}
{}

parseJson()4:
{"score":[{"result":100,"level":"A","course":"english"},{"result":50,"level":"D","course":"math"}],"contact":{"tel":"123456","email":"[e-mail]"},"name":"tom","age":19}