json学习文件

json学习资料

JSON （JavaScript Object Notation）一种简单的数据格式，比xml更轻巧。 JSON 是 JavaScript 原生格式，这意味着在 JavaScript 中处理 JSON 数据不需要任何特殊的 API 或工具包。

js 代码

1. function?jsonResponse(originalRequest)?{ ??????alert(originalRequest.responseText); ??
2. ????var?myobj?=?originalRequest.responseText.evalJSON(true); ?? ????alert(myobj.name); ??
3. } ??

JSON还提供了java的jar包 http://www.json.org/java/index.html API也很简单，下面举个例子

在javascript中填加请求参数

1. function?sendRequest()?{ ??????var?carr?=?new?Car("Dodge",?"Coronet?R/T",?1968,?"yellow"); ??
2. ????var?pars?=?"car="?+?carr.toJSONString(); ?? ??
3. ????var?url?=?"/MyWebApp/JSONTest1"; ?? ????var?mailAjax?=?new?Ajax.Request( ??
4. ????????url, ??????????{ ??
5. ????????????method:?'get', ??????????????parameters:?pars, ??
6. ????????????onComplete:?jsonResponse ??????????} ??
7. ????); ??} ??

使用JSON请求字符串就可以简单的生成JSONObject并进行解析,修改servlet添加JSON的处理(要使用json.jar)

1. private?void?doService(HttpServletRequest?request,?HttpServletResponse?response)?throws?IOException?{ ??????????String?s3?=?request.getParameter("car"); ??
2. ????????try?{ ?? ????????????JSONObject?jsonObj?=?new?JSONObject(s3); ??
3. ????????????System.out.println(jsonObj.getString("model")); ?? ????????????System.out.println(jsonObj.getInt("year")); ??
4. ????????}?catch?(JSONException?e)?{ ?? ????????????e.printStackTrace(); ??
5. ????????} ??????????response.getWriter().print("{?"name":?"Violet",?"occupation":?"character"?}"); ??
6. ????} ??

同样可以使用JSONObject生成JSON字符串，修改servlet

1. private?void?doService(HttpServletRequest?request,?HttpServletResponse?response)?throws?IOException?{ ??????????String?s3?=?request.getParameter("car"); ??
2. ????????try?{ ?? ????????????JSONObject?jsonObj?=?new?JSONObject(s3); ??
3. ????????????System.out.println(jsonObj.getString("model")); ?? ????????????System.out.println(jsonObj.getInt("year")); ??
4. ????????}?catch?(JSONException?e)?{ ?? ????????????e.printStackTrace(); ??
5. ????????} ?????????? ??
6. ????????JSONObject?resultJSON?=?new?JSONObject(); ?? ????????try?{ ??
7. ????????????resultJSON.append("name",?"Violet") ?? ??????????????????????.append("occupation",?"developer") ??
8. ??????????????????????.append("age",?new?Integer(22)); ?? ????????????System.out.println(resultJSON.toString()); ??
9. ????????}?catch?(JSONException?e)?{ ?? ????????????e.printStackTrace(); ??
10. ????????} ??????????response.getWriter().print(resultJSON.toString()); ??
11. ????} ??

1. function?jsonResponse(originalRequest)?{ ??????alert(originalRequest.responseText); ??
2. ????var?myobj?=?originalRequest.responseText.evalJSON(true); ?? ????alert(myobj.name); ??
3. ????alert(myobj.age); ??}??

参考

http://www.json.org/js.html

http://www.blogjava.net/Jkallen/archive/2006/03/28/37905.html

http://www.json.org/

http://www.prototypejs.org/learn/json

http://www.json.org/java/index.html

http://www.ibm.com/developerworks/cn/web/wa-ajaxintro10/index.html