web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="????? xmlns:xsi="???????? xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
??<servlet>
??<servlet-name>Dispatcher</servlet-name>
??<servlet-class> org.springframework.web.servlet.DispatcherServlet</servlet-class>
??<init-param>
???<param-name>contextConfigLocation</param-name>
???<param-value>/WEB-INF/config.xml</param-value>
??</init-param>
??<load-on-startup>1</load-on-startup>
?</servlet>
?<servlet-mapping>
??<servlet-name>Dispatcher</servlet-name>
??<url-pattern>*.do</url-pattern>
?</servlet-mapping>
?
?<jsp-config>
??????? <taglib>
??????????? <taglib-uri>/WEB-INF/c.tld</taglib-uri>
??????????? <taglib-location>/WEB-INF/c.tld</taglib-location>
??????? </taglib>
??????? <jsp-property-group>
??????????? <url-pattern>*.jsp</url-pattern>
??????????? <page-encoding>UTF-8</page-encoding>
??????? </jsp-property-group>
??? </jsp-config>

?<welcome-file-list>
??????? <welcome-file>/web/login/index.jsp</welcome-file>
??? </welcome-file-list>
</web-app>


config.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
?"<beans>
?<!--Definition of View Resolver -->
?<bean id="viewResolver"
??class="org.springframework.web.servlet.view.InternalResourceViewResolver">
??<property name="viewClass">
???<value>org.springframework.web.servlet.view.InternalResourceView</value>
??</property>
??<property name="prefix">
???<value>/web/login/</value>
??</property>
??<property name="suffix">
???<value>.jsp</value>
??</property>
?</bean>
?<!--Request Mapping -->
?<bean id="urlMapping"
??class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
??<property name="mappings">
??????????? <props>
??????????????? <prop key="/login.do">LoginAction</prop>
??????????? </props>
??????? </property>
?</bean>

?<!---Action Definition-->
?<bean id="LoginAction" class="com.jason.action.LoginAction">
??<property name="commandClass">
???<value>com.jason.form.LoginInfo</value>
??</property>
??<property name="fail_view">
???<value>loginfail</value>
??</property>
??<property name="success_view">
???<value>main</value>
??</property>
?</bean>
</beans>

index.jsp
<%@ page contentType="text/html; charset=utf-8" %>
<%@ taglib prefix="c" uri="<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "<html>
<body>
?<form method="POST" action="./login.do">????????? //這個地方.?指向當前路徑
??<p align="center">登錄</p><br>
???用戶名:<input type="text" name="username" >
??<br>
???密?? 碼:<input type="password" name="password" >
??<br>
??<p>
???<input type="submit" value="提交" name="B1">
???<input type="reset" value="重置" name="B2">
??</p>
?</form>
</body>
</html>


main.jsp
<%@ page contentType="text/html; charset=utf-8" %>
<%@ taglib prefix="c" uri="<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "<html>
<body>
?<p>Login Success!!!</p>
?<p>Current User:<c:out value="${logininfo.username}"/><br></p>
?<p>Your current messages:</p>
?<c:forEach items="${messages}"
??var="item"
??begin="0"
??end="9"
??step="1"
??varStatus="var">
??<c:if test="${var.index % 2 == 0}">*</c:if>
?${item}<br>
?</c:forEach>
</body>
</html>

LoginAction
package com.jason.action;

import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;

//導入的時候，之前選擇錯誤
import org.springframework.validation.BindException;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.SimpleFormController;???????????????????????

import com.jason.form.LoginInfo;

public class LoginAction extends SimpleFormController {
?
?private String fail_view;
?private String success_view;
?
?protected ModelAndView onSubmit(Object cmd, BindException ex)
?throws Exception {
??LoginInfo loginInfo = (LoginInfo) cmd;
??if (login(loginInfo) == 0) {
???HashMap result_map = new HashMap();
???result_map.put("logininfo", loginInfo);
???List msgList = new LinkedList();
???msgList.add("msg1");
???msgList.add("msg2");
???msgList.add("msg3");
???result_map.put("messages", msgList);
???return new ModelAndView(this.getSuccess_view(), result_map);
??} else {
???return new ModelAndView(this.getFail_view());
??}
??//return new ModelAndView(new RedirectView(“/redirected.jsp”));
?}
?private int login(LoginInfo loginInfo) {
??if ("Erica".equalsIgnoreCase(loginInfo.getUsername())
????&& "mypass".equals(loginInfo.getPassword())) {
???return 0;
??}
??return 1;
?}
?public String getFail_view() {
??return fail_view;
?}
?public String getSuccess_view() {
??return success_view;
?}
?public void setFail_view(String string) {
??fail_view = string;
?}
?public void setSuccess_view(String string) {
??success_view = string;
?}
?
}

LoginInfo
package com.jason.form;

import java.io.Serializable;

public class LoginInfo implements Serializable {
?private String username;
?private String password;
?public String getPassword() {
??return password;
?}
?public void setPassword(String password) {
??this.password = password;
?}
?public String getUsername() {
??return username;
?}
?public void setUsername(String username) {
??this.username = username;
?}
}


【注】調試的時候因為導入的類選擇錯誤引起問題，要注意！！！