使用fastjson进行转换

Posted 2020-09-16 bronk

package junit.test;  
  
import java.util.ArrayList;  
import java.util.HashMap;  
import java.util.List;  
import java.util.Map;  
  
import com.alibaba.fastjson.JSON;  
import com.alibaba.fastjson.TypeReference;  
/* 
 * 这里将json的转化和解析都放在一起了，大家可以根据实际需要来转化json字符串和解析json字符串 
 */  
public class TestFastJson {  
      
    static class Person{          
        private String id ;  
        private String name;  
        private int age ;  
          
        public Person(){  
              
        }  
        public Person(String id,String name,int age){  
            this.id=id;  
            this.name=name;  
            this.age=age;  
        }  
        public String getId() {  
            return id;  
        }  
        public void setId(String id) {  
            this.id = id;  
        }  
        public String getName() {  
            return name;  
        }  
        public void setName(String name) {  
            this.name = name;  
        }  
        public int getAge() {  
            return age;  
        }  
        public void setAge(int age) {  
            this.age = age;  
        }  
        @Override  
        public String toString() {  
            return "Person [age=" + age + ", id=" + id + ", name=" + name + "]";  
        }  
          
          
    }  
    public static void main(String[] args) {  
        method1();  
        method2();  
        method3();  
        method4();  
    }  
      
    static void method1(){  
        System.out.println("javabean转化示例开始----------");  
        Person person = new Person("1","fastjson",1);  
          
        //这里将javabean转化成json字符串  
        String jsonString = JSON.toJSONString(person);  
        System.out.println(jsonString);  
        //这里将json字符串转化成javabean对象,  
        person =JSON.parseObject(jsonString,Person.class);  
        System.out.println(person.toString());  
          
        System.out.println("javabean转化示例结束----------");  
    }  
      
    static void method2(){  
        System.out.println("List<javabean>转化示例开始----------");  
          
        Person person1 = new Person("1","fastjson1",1);  
        Person person2 = new Person("2","fastjson2",2);  
        List<Person> persons = new ArrayList<Person>();  
        persons.add(person1);  
        persons.add(person2);  
        String jsonString = JSON.toJSONString(persons);  
        System.out.println("json字符串:"+jsonString);  
          
        //解析json字符串  
        List<Person> persons2 = JSON.parseArray(jsonString,Person.class);  
        //输出解析后的person对象，也可以通过调试模式查看persons2的结构  
        System.out.println("person1对象："+persons2.get(0).toString());  
        System.out.println("person2对象："+persons2.get(1).toString());  
          
        System.out.println("List<javabean>转化示例结束----------");  
    }  
      
    static void method3(){  
        System.out.println("List<String>转化示例开始----------");  
        List<String> list = new ArrayList<String>();  
        list.add("fastjson1");  
        list.add("fastjson2");  
        list.add("fastjson3");  
        String jsonString = JSON.toJSONString(list);  
        System.out.println("json字符串:"+jsonString);  
          
        //解析json字符串  
        List<String> list2 = JSON.parseObject(jsonString,new TypeReference<List<String>>(){});   
        System.out.println(list2.get(0)+"::"+list2.get(1)+"::"+list2.get(2));  
        System.out.println("List<String>转化示例结束----------");  
  
    }  
      
    static void method4(){  
        System.out.println(" List<Map<String,Object>>转化示例开始 ----------");  
        Map<String,Object> map = new HashMap<String,Object>();  
        map.put("key1", "value1");  
        map.put("key2", "value2");  
        Map<String,Object> map2 = new HashMap<String,Object>();  
        map2.put("key1", 1);  
        map2.put("key2", 2);  
        List<Map<String,Object>> list = new ArrayList<Map<String,Object>>();  
        list.add(map);  
        list.add(map2);  
        String jsonString = JSON.toJSONString(list);  
        System.out.println("json字符串:"+jsonString);  
        //解析json字符串  
        List<Map<String,Object>> list2 = JSON.parseObject(jsonString,new TypeReference<List<Map<String,Object>>>(){});  
          
        System.out.println("map的key1值"+list2.get(0).get("key1"));  
        System.out.println("map的key2值"+list2.get(0).get("key2"));  
        System.out.println("ma2p的key1值"+list2.get(1).get("key1"));  
        System.out.println("map2的key2值"+list2.get(1).get("key2"));  
    }  
      
}