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"}}
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"}]}
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"}]
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);
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 }
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。
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
