官方生成方法：
1）需要什么就给什么，要属性就给属性，要对象就给对象，要集合就给集合 2）添加都是使用put（）方法要求：
1.生成如下JSON数据： {“age”:4,”name”:”zhagnsan”}
2.生成如下JSON数据： [{“age”:4,”name”:”zhangsan”},{“age”:5,”name”:”lis”},{“age”:6,”name”:”wangw”}]
3.生成如下JSON数据： {“no”:1,”name”:”android”,”employees”:[{“age”:3,”name”:”zhangsan”},{“age”:5,”name”:”lisi”},{“age”:2,”name”:”wangw”}]}
第一题代码：
package com.qf.demo5; import org.json.JSONException; import org.json.JSONObject; public class Test { public static void main(String[] args) { //生成如下JSON数据：{"age":4,"name":"zhagnsan"} JSONObject object = new JSONObject();// 产生json数据 不需要参数 try { object.put("name", "zhagnsan"); object.put("age", 4); System.out.println(object); } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }第二题代码：
Person类
package com.qf.demo2; public class Person { private int age; private String name; public Person(int age, String name) { super(); this.age = age; this.name = name; } public Person() { super(); } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getName() { return name; } public void setName(String name) { this.name = name; } @Override public String toString() { return "Person [age=" + age + ", name=" + name + "]"; } } package com.qf.demo5; import java.util.ArrayList; import java.util.List; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import com.qf.demo2.Person; public class Test2 { public static void main(String[] args) { //生成如下JSON数据：[{"age":4,"name":"zhangsan"},{"age":5,"name":"lis"},{"age":6,"name":"wangw"}] List<Person> list = new ArrayList<>(); list.add(new Person(4, "zhangsan")); list.add(new Person(5, "lis")); list.add(new Person(6, "wangw")); JSONArray array = new JSONArray(); for (int i = 0; i < list.size(); i++) { JSONObject object = new JSONObject(); try { object.put("name", list.get(i).getName()); object.put("age", list.get(i).getAge()); array.put(object); } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } } System.out.println(array); } }第三题代码：
Person类：
package com.qf.demo2; public class Person { private int age; private String name; public Person(int age, String name) { super(); this.age = age; this.name = name; } public Person() { super(); } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getName() { return name; } public void setName(String name) { this.name = name; } @Override public String toString() { return "Person [age=" + age + ", name=" + name + "]"; } } package com.qf.demo5; import java.util.ArrayList; import java.util.List; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import com.qf.demo2.Person; public class Test3 { public static void main(String[] args) { //生成如下JSON数据：{"no":1,"name":"android","employees":[{"age":3,"name":"zhangsan"},{"age":5,"name":"lisi"},{"age":2,"name":"wangw"}]} JSONObject object = new JSONObject(); try { object.put("no", 1); object.put("name", "android"); List<Person> persons = new ArrayList<>(); persons.add(new Person(3, "zhangsan")); persons.add(new Person(5, "lisi")); persons.add(new Person(2, "wangw")); object.put("employees", persons); System.out.println(object); } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }