使用DispatcherSelvert的登录验证
DispatcherSelvert的解释
DispatcherServlet是spring的web框架(以下简称SpringWeb)中的核心servlet.“Spring的web框架——象其它web框架一样——是一个请求驱动的web框架,其设计围绕一个能将请求分发到控制器的servlet,它也提供其它功能帮助web应用开发。”
bean编写
public class User {
private String username;
private 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;
}
}
Valiation编写
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.AbstractController;
import com.user.User;
public class Validation extends AbstractController {
private User user; //注入User对象
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
//登录验证 当你用AbstractController类作为你控制器的父类时
//只需要改写handleRequestInternal方法,实现业务逻辑并返回ModelAndView对象
protected ModelAndView handleRequestInternal(HttpServletRequest request,
HttpServletResponse response) throws Exception {
String username=request.getParameter("username"); //从页面获取用户名的值
String password=request.getParameter("password"); //从页面获取密码的值
if(username.equals(user.getUsername())&&password.equals(user.getPassword())){
return new ModelAndView("yes"); //跳转到登录成功页面
}else{
return new ModelAndView("error");//跳转到登录失败页面
}
}
}
applicationContext.xml编写
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
<!--定义控制器转发视图类 -->
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
<!-- 为User对象属性赋值 -->
<bean id="user" class="com.user.User">
<property name="username">
<value>admin</value>
</property>
<property name="password">
<value>111</value>
</property>
</bean>
<!-- 让bean Validation自动装配User并映射do -->
<bean name="/l.do" autowire="byName" class="com.validation.Validation">
<property name="user">
<ref local="user"/>
</property>
</bean>
</beans>
前缀
后缀
web.xml和applicationContext.xml文档写在Web Root下的WEB-INF下的lib下。
web.xml编写
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>12.7</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<!-- 自动加载配置Spring的配置文件 -->
<servlet>
<servlet-name>dispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/applicationContext.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcherServlet</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
</web-app>
Spring是基于Selvert接口的,所以还要在web.xml上配置Selvert。
初始化Selvert容器。
拦截器格式。
index.jsp
<body>
<form action="<%=request.getContextPath()%>/login.do" method="post">
<br />
<table width="284" height="141" border="0" align="center"
cellpadding="0" cellspacing="1" bgcolor="#6685C5">
<tr>
<td width="402" bgcolor="#FFFFFF">
<table width="274" height="123" border="0" align="center"
cellpadding="0" cellspacing="0">
<tr>
<td height="35">
<br>
<div align="center">
<p>
用户名:
<input type="text" name="username" size=16 maxLength=20 />
</p>
<p>
密 码:
<input type="password" name="password" size=16 maxLength=20 />
</p>
</div>
</td>
</tr>
<tr>
<td height="37" align="center">
<input type="submit" value="登录" />
<input type="reset" value="取消" />
</td>
</tr>
</table>
</td>
</tr>
</table>
</form>
采用post提交方式/login.do的格式会被拦截器拦截获取到表单参数,酱紫
实现页面
用户,密码:admin,111,配置文件也有。
获取demo链接: link.