JSON.parseObject将json转换为对象，包含三层对象转换和嵌套转换

public class JSONTest {
    public static void main(String[] args){
        String json1="{\n" +
                "    \"name\": \"skynet\",\n" +
                "    \"info\": {\n" +
                "        \"s2\": 18,\n" +
                "        \"newList\": [\n" +
                "            \"C++\",\n" +
                "            \"JAVA\",\n" +
                "            \"C#\"\n" +
                "        ],\n" +
                "        \"sub\": {\n" +
                "            \"s3\": true,\n" +
                "            \"sl\": 12.2222,\n" +
                "            \"map\": {\n" +
                "                \"student1\": {\n" +
                "                    \"name\": \"mike\",\n" +
                "                    \"info\": {\n" +
                "                        \"s2\": 14,\n" +
                "                        \"newList\": [\n" +
                "                            \"int\",\n" +
                "                            \"float\",\n" +
                "                            \"char\"\n" +
                "                        ],\n" +
                "                        \"sub\": \"\"\n" +
                "                    }\n" +
                "                }\n" +
                "            }\n" +
                "        }\n" +
                "    }\n" +
                "}";

        Students students=JSON.parseObject(json1,Students.class);

        System.out.println(students.toString());


    }
}

class Students{
    private String name;
    private Info info;                //第二层对象


    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }


    public Info getInfo() {
        return info;
    }

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

    @Override
    public String toString(){
        return "name: "+name+" "+ "info: "+info.toString();
    }
}

class Info {
    private int s2;
    private List newList;
    private Sub sub;                    //第三层对象



    public int getS2() {
        return s2;
    }

    public void setS2(int s2) {
        this.s2 = s2;
    }

    public List getNewList() {
        return newList;
    }

    public void setNewList(List newList) {
        this.newList = newList;
    }

    public Sub getSub() {
        return sub;
    }

    public void setSub(Sub sub) {
        this.sub = sub;
    }

    @Override
    public String toString(){
        return "s2: "+s2+" "+"sub: "+sub+" "+"list: "+newList;
    }
}

//继承SL对象
class Sub extends SL{       
    private boolean s3;
    private Map map;          //循环嵌套对象

    public boolean isS3() {
        return s3;
    }

    public void setS3(boolean s3) {
        this.s3 = s3;
    }

    public Map getMap() {
        return map;
    }

    public void setMap(Map map) {
        this.map = map;
    }

    @Override
    public String toString(){
        return "s3: "+s3+" "+"map: "+map+" "+"sl: "+super.toString();
    }
}

class SL{
    private double sl;

    public double getSl() {
        return sl;
    }

    public void setSl(double sl) {
        this.sl = sl;
    }

    @Override
    public String toString(){
        return "sl: "+sl;
    }
}

运行结果:
name: skynet info: s2: 18 sub: s3: true map: {student1=name: mike info: s2: 14 sub: null list: [int, float, char]} sl: sl: 12.2222 list: [C++, JAVA, C#]

使用JSON.parseObject方法将json转化为对象时，对象之间可以多层嵌套，也可以循环嵌套。对象也可以继承其他对象

注意：对象的setter和getter方法要齐全，少一个则对应的内容会提取不到。

记录于此