官方生成方法：

1）需要什么就給什么，要屬性就給屬性，要對(duì)象就給對(duì)象，要集合就給集合2）添加都是使用put（）方法

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要求：

1.生成如下JSON數(shù)據(jù)：
{“age”:4,”name”:”zhagnsan”}

2.生成如下JSON數(shù)據(jù)：
[{“age”:4,”name”:”zhangsan”},{“age”:5,”name”:”lis”},{“age”:6,”name”:”wangw”}]

3.生成如下JSON數(shù)據(jù)：
{“no”:1,”name”:”android”,”employees”:[{“age”:3,”name”:”zhangsan”},{“age”:5,”name”:”lisi”},{“age”:2,”name”:”wangw”}]}

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第一題代碼：

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數(shù)據(jù)：{"age":4,"name":"zhagnsan"}JSONObject object = new JSONObject();// 產(chǎn)生json數(shù)據(jù) 不需要參數(shù)try {object.put("name", "zhagnsan");object.put("age", 4);System.out.println(object);} catch (JSONException e) {// TODO Auto-generated catch blocke.printStackTrace();}} }

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第二題代碼：

Person類

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;}@Overridepublic 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數(shù)據(jù)：[{"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 blocke.printStackTrace();}}System.out.println(array);} }

第三題代碼：

Person類：

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;}@Overridepublic 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數(shù)據(jù)：{"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 blocke.printStackTrace();}} }

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