扩充Spring MVC 用以支持Controller对Ajax的处理 _Ajax

扩展Spring MVC 用以支持Controller对Ajax的处理

Spring Mvc中没有特别针对于Ajax请求的处理Controller.但是AbstractController和?
SimpleFormController也是可以针对Ajax的请求给与相应的.但显得有一点点的不自然.?

Java代码??

@Override??
protected?ModelAndView?onSubmit(HttpServletRequest?request,?HttpServletResponse?response,?Object?cmd,??
????????BindException?ex)?{??
????String?userId=request.getParamater("userId");??
?????????????????Map?userInfoMap=userDao.getUserBaseInfo(userId);??
?????????????????JSONObject?object?=?new?JSONObject();??
?????????????????object.put("userInfoMap",userInfoMap);??
????response.setContentType("text/Xml;charset=gbk");??
????PrintWriter?out?=?null;??
????try?{??
????????out?=?response.getWriter();??
?????????????out.println(object.toString());??
???????????????
????}??
????catch?(IOException?ex1)?{??
????????ex1.printStackTrace();??
????}finally{??
???????????????????????????out.close();??
??????????????????}??
????return?null;??
}??

说明一下我向客户端页面response的是一个JSon对象,选择JSon这种数据格式的两个原因是:?

体积小可降低流量.
Js端解码十分方便,Js对JSon格式数据有原生的支持.

使用Spring Mvc原有的SimpleFormController,从上边的例子上看是可以实现的,但是每次都要写"将JSonObject写入流,关流的代码.很累,很麻纺."?
所以,扩展了两个新的Controller,以简化对Ajax请求的处理.?
JSONObjectAbstractController 用于简单的从request.getParamater参数的情况.?
JSONObjectAbstractController 的原代码:?

Java代码??

package?com.javaest.ext.spring.mvc.controller;??
??
import?java.io.IOException;??
import?java.io.PrintWriter;??
??
import?javax.servlet.http.HttpServletRequest;??
import?javax.servlet.http.HttpServletResponse;??
??
import?net.sf.json.JSONObject;??
??
import?org.springframework.web.servlet.ModelAndView;??
import?org.springframework.web.servlet.mvc.AbstractController;??
??
public?abstract?class?JSONObjectAbstractController?extends?AbstractController?{??
??
????@Override??
????protected?ModelAndView?handleRequestInternal(HttpServletRequest?request,?HttpServletResponse?response)??
????????????throws?Exception?{??
????????JSONObject?jsonObject?=?handleAjaxRequestInternal(request,?response);??
????????response.setContentType("text/Xml;charset=gbk");??
????????PrintWriter?out?=?null;??
????????try?{??
????????????out?=?response.getWriter();??
????????????out.println(jsonObject.toString());??
????????}??
????????catch?(IOException?ex1)?{??
????????????ex1.printStackTrace();??
????????}??
????????finally?{??
????????????out.close();??
????????}??
??
????????return?null;??
????}??
??
????protected?abstract?JSONObject?handleAjaxRequestInternal(HttpServletRequest?httpServletRequest,??
????????????HttpServletResponse?httpServletResponse)?throws?Exception;??
??
}??

JSONObjectSimpleFormController 用于自动将请求参数绑定到Command对象的情况.?
JSONObjectSimpleFormController 的代码:?

Java代码??

package?com.javaest.ext.spring.mvc.controller;??
??
import?java.io.IOException;??
import?java.io.PrintWriter;??
??
import?javax.servlet.http.HttpServletRequest;??
import?javax.servlet.http.HttpServletResponse;??
??
import?net.sf.json.JSONObject;??
??
import?org.springframework.validation.BindException;??
import?org.springframework.web.servlet.ModelAndView;??
import?org.springframework.web.servlet.mvc.SimpleFormController;??
??
public?abstract?class?JSONObjectSimpleFormController?extends?SimpleFormController?{??
??
????@Override??
????protected?ModelAndView?onSubmit(HttpServletRequest?request,?HttpServletResponse?response,?Object?cmd,??
????????????BindException?ex)?{??
????????JSONObject?object?=?onAjaxSubmit(request,?response,?cmd,?ex);??
??
????????response.setContentType("text/Xml;charset=gbk");??
????????PrintWriter?out?=?null;??
????????try?{??
????????????out?=?response.getWriter();??
????????????out.println(object.toString());??
????????}??
????????catch?(IOException?ex1)?{??
????????????ex1.printStackTrace();??
????????}??
????????finally?{??
????????????out.close();??
????????}??
??
????????return?null;??
????}??
??
????public?abstract?JSONObject?onAjaxSubmit(HttpServletRequest?request,?HttpServletResponse?response,?Object?cmd,??
????????????BindException?ex);??
??
}??

以下就是我为了支持Ajax请求的处理所扩展的SpringMvc Controller.?

注：JSONObject?是json-lib-2.3-jdk15.jar中的，请自己下载导入
原帖：http://javaest.iteye.com/blog/187504