扩展Spring MVC 用以支持Controller对Ajax的处理

扩展Spring MVC 用以支持Controller对Ajax的处理pring 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;   }          @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;     }  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);     }  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);}