SpringMVC自定义拦截器——实现自动装配Action字段

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springmvc.xml配置文件：

<mvc:interceptors><!-- 引用自定义拦截器path="/user/**/"  user是包名--><mvc:interceptor><mvc:mapping path="/user/**/" /><bean class="cn.et.springmvc.lesson04.utils.ModelDriverInterceptor"></bean></mvc:interceptor></mvc:interceptors>

自定义ModelDriverInterceptor工具类：

package cn.et.springmvc.lesson04.utils;import java.lang.reflect.Field;import java.util.Enumeration;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.web.method.HandlerMethod;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;/** * 自定义拦截器 * @author Administrator * */public class ModelDriverInterceptor implements HandlerInterceptor {public void afterCompletion(HttpServletRequest arg0,HttpServletResponse arg1, Object arg2, Exception arg3)throws Exception {// TODO Auto-generated method stub}public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1,Object arg2, ModelAndView arg3) throws Exception {// TODO Auto-generated method stub}/** * 拦截器表示在Action被调用之前 * true表示继续调用 * false中断调用 */public boolean preHandle(HttpServletRequest request, HttpServletResponse response,Object handler) throws Exception {HandlerMethod hm = (HandlerMethod)handler;//获取到当前action实例Object curObject=hm.getBean();//获取到Action的结构user属性Field[] fs=curObject.getClass().getDeclaredFields();for (Field field : fs) {//设置权限field.setAccessible(true);//获取Action的字段名String name=field.getName();//获取字段的实例Object obj=field.get(curObject);if(obj==null){//对字段进行实例化obj=field.getType().newInstance();//再把实例化好的字段设置到Action里去field.set(curObject, obj);}//枚举所有的参数名称//user.userName=zs&user.password=123456Enumeration<String> enu = request.getParameterNames();while(enu.hasMoreElements()){//迭代request里甩有的参数String paramName=enu.nextElement();/** * 参数名为  user.userName进行字段对象的处理 *///判断参数名是否以user开头if(paramName.indexOf(".")>=0 && paramName.startsWith(name)){//获取到参数的值String paramValue=request.getParameter(paramName);//获取 到参数名后面的字段  user.userName  userNameString pName=paramName.split("\\.")[1];//获取到user实例的字段userNameField ff=obj.getClass().getDeclaredField(pName);ff.setAccessible(true);//把属性设置到user实例中ff.set(obj, paramValue);}/** * 参数名为Action字段的时候进行字段处理 */if(paramName.equals(name)){//String paramValue=request.getParameter(paramName);//获取到.  userNameField ff=curObject.getClass().getDeclaredField(paramName);ff.setAccessible(true);ff.set(curObject, paramValue);}}}return true;}}

Action类：

package cn.et.springmvc.lesson04;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;@Controller@RequestMapping(value="/user")public class UserAction {private UserInfo user;@RequestMapping(value="/userAction")public String va(){System.out.println(123);return null;}public UserInfo getUser() {return user;}public void setUser(UserInfo user) {this.user = user;}}

UserInfo实体类：

package cn.et.springmvc.lesson04;public class UserInfo {String userName;String password;public String getUserName() {return userName;}public void setUserName(String userName) {this.userName = userName;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}}

jsp:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@taglib uri="http://www.springframework.org/tags/form" prefix="s"%><%@taglib uri="http://www.springframework.org/tags" prefix="st"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>        <title>My JSP 'form.jsp' starting page</title>    <meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">-->  </head>    <body><form action="${pageContext.request.contextPath}/user/userAction">用户名:<input type="text" name="user.userName" /></br>密 码：<input type="password" name="user.password" /></br><input type="submit" value="提交" /></form>  </body></html>

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