package com.cn.study.day3;
public class Student {
//姓名
private String name;
//年龄
private String age;
//住址
private String address;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
@Override
public String toString() {
return "Student [name=" + name + ", age=" + age + ", address="
+ address + "]";
}
}

public static void convertObject() {
Student stu=new Student();
stu.setName("JSON");
stu.setAge("23");
stu.setAddress("北京市西城区");
//1、使用JSONObject
JSONObject json = JSONObject.fromObject(stu);
//2、使用JSONArray
JSONArray array=JSONArray.fromObject(stu);
String strJson=json.toString();
String strArray=array.toString();
System.out.println("strJson:"+strJson);
System.out.println("strArray:"+strArray);
}

public static void jsonStrToJava(){
//定义两种不同格式的字符串
String objectStr="{"name":"JSON","age":"24","address":"北京市西城区"}";
String arrayStr="[{"name":"JSON","age":"24","address":"北京市西城区"}]";
//1、使用JSONObject
JSONObject jsonObject=JSONObject.fromObject(objectStr);
Student stu=(Student)JSONObject.toBean(jsonObject, Student.class);
//2、使用JSONArray
JSONArray jsonArray=JSONArray.fromObject(arrayStr);
//获得jsonArray的第一个元素
Object o=jsonArray.get(0);
JSONObject jsonObject2=JSONObject.fromObject(o);
Student stu2=(Student)JSONObject.toBean(jsonObject2, Student.class);
System.out.println("stu:"+stu);
System.out.println("stu2:"+stu2);
}

public static void listToJSON(){
Student stu=new Student();
stu.setName("JSON");
stu.setAge("23");
stu.setAddress("北京市海淀区");
List<Student> lists=new ArrayList<Student>();
lists.add(stu);
//1、使用JSONObject
//JSONObject listObject=JSONObject.fromObject(lists);
//2、使用JSONArray
JSONArray listArray=JSONArray.fromObject(lists);
//System.out.println("listObject:"+listObject.toString());
System.out.println("listArray:"+listArray.toString());
}

public static void jsonToList(){
String arrayStr="[{"name":"JSON","age":"24","address":"北京市西城区"}]";
//转化为list
List<Student> list2=(List<Student>)JSONArray.toList(JSONArray.fromObject(arrayStr), Student.class);
for (Student stu : list2) {
System.out.println(stu);
}
//转化为数组
Student[] ss =(Student[])JSONArray.toArray(JSONArray.fromObject(arrayStr),Student.class);
for (Student student : ss) {
System.out.println(student);
}
}

public static void mapToJSON(){
Student stu=new Student();
stu.setName("JSON");
stu.setAge("23");
stu.setAddress("中国上海");
Map<String,Student> map=new HashMap<String,Student>();
map.put("first", stu);
//1、JSONObject
JSONObject mapObject=JSONObject.fromObject(map);
System.out.println("mapObject"+mapObject.toString());
//2、JSONArray
JSONArray mapArray=JSONArray.fromObject(map);
System.out.println("mapArray:"+mapArray.toString());
}

public static void jsonToMap(){
String strObject="{"first":{"address":"中国上海","age":"23","name":"JSON"}}";
//JSONObject
JSONObject jsonObject=JSONObject.fromObject(strObject);
Map map=new HashMap();
map.put("first", Student.class);
//使用了toBean方法，需要三个参数 
MyBean my=(MyBean)JSONObject.toBean(jsonObject, MyBean.class, map);
System.out.println(my.getFirst());
}

package com.cn.study.day4;
import java.util.Map;
import com.cn.study.day3.Student;
public class MyBean {
private Student first;
public Student getFirst() {
return first;
}
public void setFirst(Student first) {
this.first = first;
}
}