fastjson使用TypeReference示例

    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"));
        }  

    }  

本文转自：https://blog.csdn.net/qq_16504067/article/details/78081746