FastJson

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FastJson的应用

一、阿里巴巴FastJson是一个Json处理工具包，包括“序列化”和“反序列化”两部分，它具备如下特征：
速度最快，测试表明，fastjson具有极快的性能，超越任其他的Java Json parser。包括自称最快的JackJson；
功能强大，完全支持Java Bean、集合、Map、日期、Enum，支持范型，支持自省；无依赖，能够直接运行在Java SE 5.0以上版本；支持Android；开源 (Apache 2.0)

将javaBean对象包装成json格式

                JSONObject jsonObject=new JSONObject();
        User user=new User("尚晓飞", "男", 25, new Date(), "bjsxt");
        jsonObject.put("user", user);
        System.out.println("Test.main()"+jsonObject.toString());

                //打印结果：Test.main(){"user":{"age":25,"birthDay":1405067572140,"name":"尚晓飞","school":"bjsxt","sex":"男"}}

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将list集合包装成json

 1 User user=new User("尚晓飞", "男", 25, new Date(), "bjsxt");
 2         User user2=new User("sxf", "女", 22, new Date(), "北京尚学堂");
 3         User user3=new User("当当", "男", 25, new Date(), "当当网");
 4         List<Object> userList=new ArrayList<Object>();
 5         
 6         userList.add(user);
 7         userList.add(user2);
 8         userList.add(user3);
 9         
10         JSONObject jsonObject=new JSONObject();
11         jsonObject.put("userlist", userList);
12         
13         
14         System.out.println("Test.main()"+jsonObject);
15         
16 //打印结果：Test.main(){"userlist":[{"age":25,"birthDay":1405069939080,"name":"尚晓飞","school":"bjsxt","sex":"男"},{"age":22,"birthDay":1405069939080,"name":"sxf","school":"北京尚学堂","sex":"女"},{"age":25,"birthDay":1405069939080,"name":"当当","school":"当当网","sex":"男"}]}

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将list集合包装成json格式的数组

 1 User user=new User("尚晓飞", "男", 25, new Date(), "bjsxt");
 2         User user2=new User("sxf", "女", 22, new Date(), "北京尚学堂");
 3         User user3=new User("当当", "男", 25, new Date(), "当当网");
 4         List<Object> userList=new ArrayList<Object>();
 5         
 6         userList.add(user);
 7         userList.add(user2);
 8         userList.add(user3);
 9         
10         JSONArray jsonArray=new JSONArray(userList);
11         
12         
13         System.out.println("Test.main()"+jsonArray);
14 
15 //打印结果:Test.main()[{"age":25,"birthDay":1405069524031,"name":"尚晓飞","school":"bjsxt","sex":"男"},{"age":22,"birthDay":1405069524031,"name":"sxf","school":"北京尚学堂","sex":"女"},{"age":25,"birthDay":1405069524031,"name":"当当","school":"当当网","sex":"男"}]

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将list集合包装成json格式的数组

1 User user=new User("尚晓飞", "男", 25, new Date(), "bjsxt");
2         User user2=new User("sxf", "女", 22, new Date(), "北京尚学堂");
3         User user3=new User("当当", "男", 25, new Date(), "当当网");
4         List<Object> userList=new ArrayList<Object>();
5         
6         userList.add(user);
7         userList.add(user2);
8         userList.add(user3);
9         JSON json=(JSON) JSON.toJSON(userList);

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在javascript中操作json对象

 1 //如果是一个json对象var abc={"key":"value"}
 2 //取出key对应的值
 3 var v=abc.key
 4 var v=abc["key"]
 5 
 6 
 7 //如果是一个json数组的对象   var abc=[{"one":"一","name":"尚晓飞"},{"one":"二","name":"尚小帅"}]
 8 
 9 for(var i=0;i<abc.length;i++){
10      var m=abc[i].name;
11      var o=abc[i].one; 
12      var m=abc[i]["name"]           
13 }

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FastJSON的API

1 public static final Object parse(String text); // 把JSON文本parse为JSONObject或者JSONArray 
2 public static final JSONObject parseObject(String text)； // 把JSON文本parse成JSONObject    
3 public static final  T parseObject(String text, Class clazz); // 把JSON文本parse为JavaBean 
4 public static final JSONArray parseArray(String text); // 把JSON文本parse成JSONArray 
5 public static final  List parseArray(String text, Class clazz); //把JSON文本parse成JavaBean集合 
6 public static final String toJSONString(Object object); // 将JavaBean序列化为JSON文本 
7 public static final String toJSONString(Object object, boolean prettyFormat); // 将JavaBean序列化为带格式的JSON文本 
8 public static final Object toJSON(Object javaObject); 将JavaBean转换为JSONObject或者JSONArray。

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测试代码

 1 Fave fave1=new Fave("打游戏", new Date());
 2         Fave fave2=new Fave("下象棋", new Date());
 3         
 4         Student st1=new Student("尚晓飞", 1,new Date(),fave1);
 5         Student st2=new Student("尚小帅",1,new Date(),fave2);
 6         
 7         List<Student> list=new ArrayList<Student>();
 8         list.add(st1);
 9         list.add(st2);
10         
11         //javaBean---》json格式字符串
12         String jsonString=JSONObject.toJSONString(st1);
13         String listString=JSONObject.toJSONString(list);
14         System.out.println("javabean--->string"+jsonString);
15         //打印结果：javabean--->string{"birthday":1411713587089,"fave":{"date":1411713587088,"name":"打游戏"},"name":"尚晓飞","sex":1}
16         System.out.println("list---->String"+listString);
17         //打印结果：list---->String[{"birthday":1411714397844,"fave":{"date":1411714397843,"name":"打游戏"},"name":"尚晓飞","sex":1},
18         //{"birthday":1411714397844,"fave":{"date":1411714397843,"name":"下象棋"},"name":"尚小帅","sex":1}]
19         
20         //javaBean---》json对象
21         JSONObject jsonObject=(JSONObject) JSONObject.toJSON(st1);
22         
23         String nameString=(String) jsonObject.get("name");//根据key值获取json对象的value值
24         Object object= jsonObject.get("fave");//特殊：转成的fave内容为{key:vlaue}所以说不能够转换成fave对象，只能进行二次转换，转换成javaBean
25         String fav=object.toString();
26         
27         //将json格式的字符串转换成---》javaBean
28         Fave fave=JSONObject.parseObject(fav, Fave.class);
29         System.out.println("Test.main()"+nameString);//尚晓飞
30         System.out.println("Test.main()"+fave.getName());//打游戏

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posted on 2014-07-11 16:46 无信不立阅读(1884) 评论(0) 收藏举报

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