- 擴展Spring MVC 用以支持Controller對Ajax的處理
- pring Mvc中沒有特別針對於Ajax請求的處理Controller.但是AbstractController和
- SimpleFormController也是可以針對Ajax的請求給與相應的.但顯得有一點點的不自然.
- Java代碼
- @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;
- }
- 說明一下我向客戶端頁面response的是一個JSon對象,選擇JSon這種數據格式的兩個原因是:
- 體積小可降低流量.
- Js端解碼十分方便,Js對JSon格式數據有原生的支持.
- 使用Spring Mvc原有的SimpleFormController,從上邊的例子上看是可以實現的,但是每次都要寫"將JSonObject寫入流,關流的代碼.很累,很麻紡."
- 所以,擴展了兩個新的Controller,以簡化對Ajax請求的處理.
- JSONObjectAbstractController 用於簡單的從request.getParamater參數的情況.
- JSONObjectAbstractController 的原代碼:
- Java代碼
- 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 用於自動將請求參數綁定到Command對象的情況.
- JSONObjectSimpleFormController 的代碼:
- Java代碼
- 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);
- }
擴展Spring MVC用以支持Controller對Ajax的處理
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