fastjson使用实例

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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;}@Overridepublic 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"));}}
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