spring入门简单登陆例子

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tomcat目录的设置，和加载spring的包的问题就不多说了。

开始。。。。

/Login/index.jsp

<%@ include file="/WEB-INF/jsp/include.jsp" %>

<c:redirect url="/index.htm"></c:redirect>

/Login/WEB-INF/jsp/include.jsp

<%@ page session="false"%>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>

/Login/WEB-INF/jsp/index.jsp

<%@ page contentType="text/html; charset=GBK" %>

<html>

<head>

<title>

index

</title>

</head>

<%@ include file="login.jsp" %>

</body>

</html>

/Login/WEB-INF/jsp/login.jsp

<%@page contentType="text/html; charset=GBK"%>

<%@include file="/WEB-INF/jsp/include.jsp"%>

<html>

<head>

<title>login</title>

</head>

<br>

用户名:

<br>

密码 :

<br>

<p>

</p>

</form>

</body>

</html>

/Login/WEB-INF/jsp/loginfail.jsp

<%@ page contentType="text/html; charset=GBK" %>

<html>

<head>

<title>

loginfail

</title>

</head>

<h1>

错误页面

</h1>

</body>

</html>

/Login/WEB-INF/jsp/main.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core_rt" %>

<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">

${item}<br>

</c:forEach>

</body>

</html>

配置文件部分

/Login/WEB-INF/index-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">

<beans>

<props>

<prop key="/index.htm">indexController</prop>

</props>

</property>

</bean>

<property name="viewClass"><value>org.springframework.web.servlet.view.JstlView</value></property>

</bean>

</beans>

/Login/WEB-INF/login-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">

<beans>

<property name="viewClass"><value>org.springframework.web.servlet.view.JstlView</value></property>

</bean>

<value>login.LoginInfo</value>

</property>

<value>loginfail</value>

</property>

</property>

</bean>

<props>

<prop key="/login.do">LoginAction</prop>

</props>

</property>

</bean>

</beans>

/Login/WEB-INF/web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" version="2.4">

<display-name>login</display-name>

<servlet-name>index</servlet-name>

<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

<load-on-startup>1</load-on-startup>

</servlet>

<servlet-mapping>

<servlet-name>index</servlet-name>

<url-pattern>*.htm</url-pattern>

</servlet-mapping>

<welcome-file-list>

<welcome-file>index.jsp</welcome-file>

</welcome-file-list>

<servlet-name>login</servlet-name>

<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

<!--<init-param>

<param-name>contextConfigLocation</param-name>

<param-value>/WEB-INF/login-servlet.xml</param-value>

</init-param>-->

</servlet>

<servlet-mapping>

<servlet-name>login</servlet-name>

<url-pattern>*.do</url-pattern>

</servlet-mapping>

</web-app>

.java部分

/Login/WEB-INF/classes/index/IndexController.java

package index;

import org.springframework.web.servlet.mvc.Controller;

import org.springframework.web.servlet.ModelAndView;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

import org.apache.log4j.Logger;

import org.apache.log4j.Level;

public class IndexController implements Controller{

public IndexController() {

}

private static Logger logger = Logger.getLogger(IndexController.class);

public ModelAndView handleRequest(HttpServletRequest request,

HttpServletResponse response) throws

Exception {

return new ModelAndView("index");

}

/Login/WEB-INF/classes/login/LoginAction.java

package login;

import org.springframework.web.servlet.mvc.SimpleFormController;

import org.springframework.web.servlet.ModelAndView;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

import java.net.BindException;

import org.springframework.validation.BindException.*;

import org.springframework.context.ApplicationContext;

import org.springframework.context.ApplicationContextAware;

import java.util.Map;

import java.util.HashMap;

import org.apache.log4j.Logger;

import org.apache.log4j.Level;

import java.util.*;

public class LoginAction extends SimpleFormController {

public LoginAction() {

this.setCommandClass(LoginInfo.class);

}

private String fail_view;

private String success_view;

private int login(LoginInfo logininfo){

if("123321".equalsIgnoreCase(logininfo.getUsername()) && "123321".equals(logininfo.getPassword())){

return 0;

}

return 1;

}

public void setFail_view(String s){

this.fail_view=s;

}

public String getFail_view(){

return this.fail_view;

}

public void setSuccess_view(String s){

this.success_view =s;

}

public String getSuccess_view(){

return this.success_view;

}

protected ModelAndView onSubmit(Object cmd,org.springframework.validation.BindException errors) throws Exception {

LoginInfo logininfo = (LoginInfo)cmd;

if (login(logininfo) == 0){

HashMap resultmap = new HashMap();

resultmap.put("logininfo",logininfo);

List msglist = new LinkedList();

msglist.add("登陆成功");

msglist.add("");

resultmap.put("messages",msglist);

return new ModelAndView(this.getSuccess_view(),resultmap);

}

else{

return new ModelAndView(this.getFail_view());

}

/Login/WEB-INF/classes/login/LoginInfo.java

package login;

public class LoginInfo {

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;

}

结果图。。。。。。

例子当中没有连接数据库部分，我也是刚学，希望这个例子对大家有用，在我机器上可以运行。

有问题的话，请检查下面几个点

1。版本问题，spring2.0,servlet2.4,tomcat5.5，jdk5.0等等的问题。

2。配置文件有无写错，是很关键的，有时一点一斜杠都是重点。

3。每个Controller对应都有一个xml的配置文件

应该就这个要注意了吧。。。第一次写的话，建议手动一次，记忆印象下。。。。就这样了，有问题留言讨论。。