Spring Framework循序浅进(2)-原创
类别: JAVA教程 
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 rc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: pring/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: pring/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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