生成JSON数据--官方方法

╰+攻爆jí腚メ 2022-06-16 04:23 251阅读 0赞

**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.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();
            }
        }
    }