fastjson 之常见的数据类型与json的相互转换

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","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","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,"name":"MARTIN"}]  
    }  
      
    /** 
     * list集合转json格式字符串 
     */  
    public void list2Json(){  
        List list = new ArrayList();  
        User user1 = new User("L001",16);  
        list.add(user1);  
        User user2 = new User("L002",21);  
        list.add(user2);  
        User user3 = new User("L003",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","id":"L002","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",16,address1);  
        list.add(user1);  
        Address address2 = new Address("江西省","南昌市","阳明路","330004");  
        User user2 = new User("L002",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",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,{"address":{"city":"南昌市","post":"330004","province":"江西省","street":"阳明路"},"age":21,{"address":{"city":"西安市","post":"710114","province":"陕西省","street":"长安南路"},"age":20,"name":"MARTIN"}]  
    }  
  
    /** 
     * map转json格式字符串 
     */  
    public void map2Json(){  
        Map map = new HashMap();  
        Address address1 = new Address("广东省","580053");  
        map.put("address1",address1);  
        Address address2 = new Address("江西省","330004");  
        map.put("address2",address2);  
        Address address3 = new Address("陕西省","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","address2":{"city":"南昌市","address3":{"city":"西安市","street":"长安南路"}}  
    }  
      
}  

（编辑：李大同）

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