JSON

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跨语言交换数据：

              1：xml

              2: json

JSON(JavaScript Object Notation):

              轻量级的数据交换格式，用于在不同的环境中，不同的语言中，像对方传输数据呀！

              Client:Html,JS Java:Servlet

                                           把后台的数据传递给前台

              前台得到JSON               <------------- 把数据转成JSON

JSON一般有两种组成形式：

              json对象：必须以{}描述！

                            var citys = {uname:‘谢海浪‘,sex:‘random‘,age:18};

                            alert(citys.uname);

              json数组：必须一[]描述！

                            var citys = [1,2,3,4,5,6];

                            alert(citys[3]); 

                            var school = [{uname:‘谢海浪‘,sex:‘random‘,age:18},{uname:‘董冲‘,sex:‘random‘,age:28},{uname:‘董卓‘,sex:‘男‘,age:18}];

                            var school = [{uname:‘谢海浪‘,sex:‘random‘,age:18},{uname:‘董冲‘,sex:‘random‘,age:28},{uname:‘董卓‘,sex:‘男‘,age:18}];

                            for(var i=0;i<school.length;i++){

                                          alert(school[i].sex);

                            }

                            var school = [{uname:‘谢海浪‘,sex:‘random‘,age:18,girlfriends:[‘凤姐‘,‘黄河穿‘,‘如花‘]},{uname:‘董冲‘,sex:‘random‘,age:28},{uname:‘董卓‘,sex:‘男‘,age:18}];

                            //alert(school[0].girlfriends[0]);

                            for(var i=0;i<school[0].girlfriends.length;i++){

                                          alert(school[0].girlfriends[i]);

                            }

              字符串转JSON:

                            var school = "[{uname:‘谢海浪‘,sex:‘random‘,age:18,girlfriends:[‘凤姐‘,‘黄河穿‘,‘如花‘]},{uname:‘董冲‘,sex:‘random‘,age:28},{uname:‘董卓‘,sex:‘男‘,age:18}]";              

                            var json = eval("("+school+")");

                            alert(json);

Java对象如何转换成JSON:

              1:倒包

              2：打json!

                            打数组，集合

                            JSONArray               

                            打对象

                            JSONObjcet 

              UserinfoMapper userinfoMapper = MyBatisUtil.getSession().getMapper(UserinfoMapper.class);

                            List userinfos =userinfoMapper.selectByExample(null);

                            //JSONArray json = JSONArray.fromObject(userinfos);

                            //System.out.println(json);

                            Userinfo info = userinfoMapper.selectByPrimaryKey(8);

                            JSONObject json = JSONObject.fromObject(info);

                            System.out.println(json);

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JSON

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原文地址：http://www.cnblogs.com/YOJOYGROUP/p/5672900.html