fastjson和数组，list，map之间转换 博客分类： java json

package fastJson.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.JSONArray; 
 
public class FastJsonTest1 
{ 
 
    /**
     * 数组转json格式字符串
     */ 
    public void array2Json(){ 
        String[] arr = {"bill","green","maks","jim"}; 
        String jsonText = JSON.toJSONString(arr, true); 
        System.out.println("array2Json()方法：jsonText=="+jsonText); 
        // 输出结果：jsonText==["bill","green","maks","jim"] 
    } 
 
    /**
     * json格式字符串转数组
     */ 
    public void json2Array(){ 
        String jsonText = "[\"bill\",\"green\",\"maks\",\"jim\"]"; 
        JSONArray jsonArr = JSON.parseArray(jsonText); 
        System.out.println("json2Array()方法：jsonArr=="+jsonArr); 
        // 输出结果：jsonArr==["bill","green","maks","jim"] 
    } 
     
    /**
     * 数组转json格式字符串
     */ 
    public void array2Json2(){ 
        User user1 = new User("P001","TOM",16); 
        User user2 = new User("P002","JACKSON",21); 
        User user3 = new User("P003","MARTIN",20); 
        User[] userArr = {user1,user2,user3}; 
        String jsonText = JSON.toJSONString(userArr, true); 
        System.out.println("array2Json2()方法：jsonText=="+jsonText); 
        //输出结果：jsonText==[{"age":16,"id":"P001","name":"TOM"},{"age":21,"id":"P002","name":"JACKSON"},{"age":20,"id":"P003","name":"MARTIN"}] 
    } 
     
    /**
     * json格式字符串转数组
     */ 
    public void json2Array2(){ 
        String jsonText = "[{\"age\":16,\"id\":\"P001\",\"name\":\"TOM\"},{\"age\":21,\"id\":\"P002\",\"name\":\"JACKSON\"},{\"age\":20,\"id\":\"P003\",\"name\":\"MARTIN\"}]"; 
        JSONArray jsonArr = JSON.parseArray(jsonText); 
        System.out.println("json2Array2()方法：jsonArr=="+jsonArr); 
        // 输出结果：jsonArr==[{"age":16,"id":"P001","name":"TOM"},{"age":21,"id":"P002","name":"JACKSON"},{"age":20,"id":"P003","name":"MARTIN"}] 
    } 
     
    /**
     * list集合转json格式字符串
     */ 
    public void list2Json(){ 
        List list = new ArrayList(); 
        User user1 = new User("L001","TOM",16); 
        list.add(user1); 
        User user2 = new User("L002","JACKSON",21); 
        list.add(user2); 
        User user3 = new User("L003","MARTIN",20); 
        list.add(user3); 
        String jsonText = JSON.toJSONString(list, true); 
        System.out.println("list2Json()方法：jsonText=="+jsonText); 
        //输出结果：jsonText==[{"age":16,"id":"L001","name":"TOM"},{"age":21,"id":"L002","name":"JACKSON"},{"age":20,"id":"L003","name":"MARTIN"}] 
    } 
     
    /**
     * list集合转json格式字符串
     */ 
    public void list2Json2(){ 
        List list = new ArrayList(); 
        Address address1 = new Address("广东省","深圳市","科苑南路","580053"); 
        User user1 = new User("L001","TOM",16,address1); 
        list.add(user1); 
        Address address2 = new Address("江西省","南昌市","阳明路","330004"); 
        User user2 = new User("L002","JACKSON",21,address2); 
        list.add(user2); 
        Address address3 = new Address("陕西省","西安市","长安南路","710114"); 
        User user3 = new User("L003","MARTIN",20,address3); 
        list.add(user3); 
        String jsonText = JSON.toJSONString(list, true); 
        System.out.println("list2Json2()方法：jsonText=="+jsonText); 
        //输出结果：jsonText==[{"address":{"city":"深圳市","post":"580053","province":"广东省","street":"科苑南路"},"age":16,"id":"L001","name":"TOM"},{"address":{"city":"南昌市","post":"330004","province":"江西省","street":"阳明路"},"age":21,"id":"L002","name":"JACKSON"},{"address":{"city":"西安市","post":"710114","province":"陕西省","street":"长安南路"},"age":20,"id":"L003","name":"MARTIN"}] 
    } 
 
    /**
     * map转json格式字符串
     */ 
    public void map2Json(){ 
        Map map = new HashMap(); 
        Address address1 = new Address("广东省","深圳市","科苑南路","580053"); 
        map.put("address1", address1); 
        Address address2 = new Address("江西省","南昌市","阳明路","330004"); 
        map.put("address2", address2); 
        Address address3 = new Address("陕西省","西安市","长安南路","710114"); 
        map.put("address3", address3); 
        String jsonText = JSON.toJSONString(map, true); 
        System.out.println("map2Json()方法：jsonText=="+jsonText); 
        //输出结果：jsonText=={"address1":{"city":"深圳市","post":"580053","province":"广东省","street":"科苑南路"},"address2":{"city":"南昌市","post":"330004","province":"江西省","street":"阳明路"},"address3":{"city":"西安市","post":"710114","province":"陕西省","street":"长安南路"}} 
    } 
     
     
     
    public static void main(String[] args) 
    { 
        FastJsonTest1 test = new FastJsonTest1(); 
        //数组转json格式字符串 
        test.array2Json(); 
         
        //json格式字符串转数组 
        test.json2Array(); 
         
        //数组转json格式字符串 
        test.array2Json2(); 
         
        //json格式字符串转数组 
        test.json2Array2(); 
         
        //list集合转json格式字符串 
        test.list2Json(); 
         
        //list集合转json格式字符串 
        test.list2Json2(); 
         
        //map转json格式字符串 
        test.map2Json(); 
    }