作者：王斌 2005-04-06
通过第一个例子，我们对Spring Framework有了一点感性上的认识，现在我们通过一个具体的login例子，完整的阐述Spring Framework的实际应用!本文中的IDE为Eclipse!
1.我们使用的WEB服务器是tomcat，所以在D:\tomcat\webapps\webapps下新建一个目录spring,并在下面新建两个文件，用于Eclipse导入本工程.
.classpath
<?xml version="1.0" encoding="UTF-8"?>
<classpath>
<classpathentry kind="src" path="WEB-INF/src"/>
<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
<classpathentry kind="output" path="WEB-INF/classes"/>
</classpath>
.project
<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
<name>spring1</name>
<comment></comment>
<projects>
</projects>
<buildSpec>
<buildCommand>
<name>org.eclipse.jdt.core.javabuilder</name>
<arguments>
</arguments>
</buildCommand>
</buildSpec>
<natures>
<nature>org.eclipse.jdt.core.javanature</nature>
</natures>
</projectDescription>
2.在spring下新建一个目录WEB-INF,在下面新建文件web.xml,Config.xml以便tomcat初始化spring
web.xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<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">
<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>
</servlet>
<servlet-mapping>
<servlet-name>Dispatcher</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
</web-app>
Config.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<!--Definition of View Resolver -->
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass"> <value>org.springframework.web.servlet.view.JstlView </value> </property>
<property name="prefix"> <value>/</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="action.LoginAction">
<property name="commandClass">
<value>action.LoginInfo</value>
</property>
<property name="fail_view">
<value>loginfail</value>
</property>
<property name="success_view">
<value>main</value>
</property>
</bean>
</beans>
3.在web-inf下新建三个目录src,classes,lib,如图
4.在Eclipse中导入spring
ok,spring导入完成!!!
5.在spring目录下建立三个jsp文件
index.jsp
<%@ page contentType="text/html; charset=gb2312" %>
<%@ page language="java" %>
<!DOCTYPE HTML PUBLIC "-//w3c//dtd html 4.0 transitional//en">
<html>
<head>
<title>Lomboz JSP</title>
</head>
<body bgcolor="#FFFFFF">
<form method="POST" action="login.do">
<p align="left">登录</p>
<br>
用户名:
<input type="text" name="username" >
<br>
密 码 :
<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=gb2312" %>
<html>
<body>
<p>Login Success!!!</p>
</body>
</html>
loginfail.jsp
<%@ page contentType="text/html; charset=gb2312" %>
<html>
<body>
<p>Login failed!!!</p>
</body>
</html>
6.在WEB-INF\src下新建包action,在action包下新建二个java文件,注意,要在项目中导入e:\Spring\dist下的所有jar包,否则Eclipse提示找不到类文件!
LoginInfo.java
package action;
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;
}
}
LoginAction.java
package action;
import java.util.*;
import org.springframework.validation.*;
import org.springframework.web.servlet.*;
import org.springframework.web.servlet.mvc.*;
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);
return new ModelAndView(this.getSuccess_view(), result_map);
} else {
return new ModelAndView(this.getFail_view());
}
}
private int login(LoginInfo loginInfo) {
if ("qqq".equalsIgnoreCase(loginInfo.getUsername())
&& "1".equals(loginInfo.getPassword())) {//假设用户名是"qqq"，密码"1"
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;
}
}
7.在WEB-INF\lib下拷入e:\Spring\dist下的所有jar包,注意一点,还要从sun的网站上下载jstl.jar,要不然会出现
"java.lang.NoClassDefFoundError: javax/servlet/jsp/jstl/fmt/LocalizationContext"的提示!全图如下(包括第一个例子)：
ok!现在可以启动tomcat,IE上输入http://localhost/spring/index.jsp
验证失败！
验证成功!
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