fastjson使用实例 TypeReference

谁践踏了优雅 2023-02-21 11:54 18阅读 0赞

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

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"));  
            }  
              
        }