目标:登录验证,登录成功转向成功页面,可以进行用户添加操作,登录失败转向失败页面,未登录就输入添加用用户的连接则非法,强制跳转到登陆页面
1 . 首先添加struts2 jar
commons-fileupload-1.2.1.jar
commons-io-1.3.2.jar
freemarker-2.3.16.jar
javassist-3.7.ga.jar
ognl-3.0.jar
struts2-core-2.2.1.jar
xwork-core-2.2.1.jar
2 . 配置strtus的拦截器,在web.xml配置
<filter> <filter-name>struts2</filter-name> <filter-class> org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter </filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>
3. 编写登陆验证的Ation ,LoginAction.java
//实现modelDriven接口
public class LoginAction implements ModelDriven{
private User user ;
@Override
public Object getModel() {
if(user == null){
user = new User();
}
return user ;
}
//账号密码判断
public String login(){
//账号密码正确进入成功页面
if("admin".equals(user.getUsername()) && "admin".equals(user.getPassword())){
//把user放到session
ActionContext.getContext().getSession().put("Login", user);
return "success" ;
}
//否则进入失败页面
return "fail";
}
}
4 . 编写模拟用户添加的action
public class UserAction {
public String add(){
return "add";
}
}
5 . 编写判断是否登陆的拦截器
//实现Interceptor接口
public class LoginInterceptor implements Interceptor{
@Override
public void destroy() {
}
@Override
public void init() {
}
@Override
public String intercept(ActionInvocation invocation) throws Exception {
//如果从session取不到值的话,表示用户未登录,转到登陆页面
if(invocation.getInvocationContext().getSession().get("Login")==null){
return "index";
}
//继续往下执行
return invocation.invoke();
}
}
6 . 配置struts.xml文件,分三部分贴
(1) 配置登陆拦截器和默认使用的拦截器
<!-- 一系列的拦截器 -->
<interceptors>
<!-- 登陆用到的拦截器 -->
<interceptor name="logininterceptor"
class="cn.com.action.LoginInterceptor">
</interceptor>
<!-- 拦截栈 -->
<interceptor-stack name="needLoginStack">
<interceptor-ref name="exception" />
<interceptor-ref name="logininterceptor" />
<interceptor-ref name="alias" />
<interceptor-ref name="servletConfig" />
<interceptor-ref name="i18n" />
<interceptor-ref name="prepare" />
<interceptor-ref name="chain" />
<interceptor-ref name="debugging" />
<interceptor-ref name="scopedModelDriven" />
<interceptor-ref name="modelDriven">
<param name="refreshModelBeforeResult">true</param>
</interceptor-ref>
<interceptor-ref name="fileUpload" />
<interceptor-ref name="checkbox" />
<interceptor-ref name="multiselect" />
<interceptor-ref name="staticParams" />
<interceptor-ref name="actionMappingParams" />
<interceptor-ref name="params">
<param name="excludeParams">
dojo\..*,^struts\..*
</param>
</interceptor-ref>
<interceptor-ref name="conversionError" />
<interceptor-ref name="validation">
<param name="excludeMethods">
input,back,cancel,browse
</param>
</interceptor-ref>
<interceptor-ref name="workflow">
<param name="excludeMethods">
input,back,cancel,browse
</param>
</interceptor-ref>
</interceptor-stack>
<!-- The completeStack is here for backwards compatibility for
applications that still refer to the defaultStack by the
old name -->
<interceptor-stack name="completeStack">
<interceptor-ref name="defaultStack" />
</interceptor-stack>
<!-- Sample execute and wait stack.
Note: execAndWait should always be the *last* interceptor. -->
<interceptor-stack name="executeAndWaitStack">
<interceptor-ref name="execAndWait">
<param name="excludeMethods">input,back,cancel</param>
</interceptor-ref>
<interceptor-ref name="defaultStack" />
<interceptor-ref name="execAndWait">
<param name="excludeMethods">input,back,cancel</param>
</interceptor-ref>
</interceptor-stack>
<!-- 未配置登陆验证的拦截栈 -->
<interceptor-stack name="otherStack">
<interceptor-ref name="exception" />
<interceptor-ref name="alias" />
<interceptor-ref name="servletConfig" />
<interceptor-ref name="i18n" />
<interceptor-ref name="prepare" />
<interceptor-ref name="chain" />
<interceptor-ref name="debugging" />
<interceptor-ref name="scopedModelDriven" />
<interceptor-ref name="modelDriven">
<param name="refreshModelBeforeResult">true</param>
</interceptor-ref>
<interceptor-ref name="fileUpload" />
<interceptor-ref name="checkbox" />
<interceptor-ref name="multiselect" />
<interceptor-ref name="staticParams" />
<interceptor-ref name="actionMappingParams" />
<interceptor-ref name="params">
<param name="excludeParams">
dojo\..*,^struts\..*
</param>
</interceptor-ref>
<interceptor-ref name="conversionError" />
<interceptor-ref name="validation">
<param name="excludeMethods">
input,back,cancel,browse
</param>
</interceptor-ref>
<interceptor-ref name="workflow">
<param name="excludeMethods">
input,back,cancel,browse
</param>
</interceptor-ref>
</interceptor-stack>
</interceptors>
2 . 配置默认使用登陆拦截器
<default-interceptor-ref name="needLoginStack"></default-interceptor-ref> <global-results> <result name="index">/index.jsp</result> </global-results>
3 . 配置LoginAction 和UserAction
<action name="login" class="cn.com.action.LoginAction">
<result name="success">/success.jsp</result>
<result name="fail">/fail.jsp</result>
<!-- 很明显,登陆判断的Action并不需要判断是否登陆 -->
<interceptor-ref name="otherStack"></interceptor-ref>
</action>
<action name="user" class="cn.com.action.UserAction">
<result name="add">/addSuccess.jsp</result>
<!-- 除了登陆判断的Action,其他所有的Action都需要判断是否已经登陆,登陆方能操作 -->
<interceptor-ref name="needLoginStack"></interceptor-ref>
</action>
4 . struts.xml总体配置:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<package name="system" namespace="/system" extends="struts-default">
<!-- 一系列的拦截器 -->
<interceptors>
<!-- 登陆用到的拦截器 -->
<interceptor name="logininterceptor"
class="cn.com.action.LoginInterceptor">
</interceptor>
<!-- 拦截栈 -->
<interceptor-stack name="needLoginStack">
<interceptor-ref name="exception" />
<interceptor-ref name="logininterceptor" />
<interceptor-ref name="alias" />
<interceptor-ref name="servletConfig" />
<interceptor-ref name="i18n" />
<interceptor-ref name="prepare" />
<interceptor-ref name="chain" />
<interceptor-ref name="debugging" />
<interceptor-ref name="scopedModelDriven" />
<interceptor-ref name="modelDriven">
<param name="refreshModelBeforeResult">true</param>
</interceptor-ref>
<interceptor-ref name="fileUpload" />
<interceptor-ref name="checkbox" />
<interceptor-ref name="multiselect" />
<interceptor-ref name="staticParams" />
<interceptor-ref name="actionMappingParams" />
<interceptor-ref name="params">
<param name="excludeParams">
dojo\..*,^struts\..*
</param>
</interceptor-ref>
<interceptor-ref name="conversionError" />
<interceptor-ref name="validation">
<param name="excludeMethods">
input,back,cancel,browse
</param>
</interceptor-ref>
<interceptor-ref name="workflow">
<param name="excludeMethods">
input,back,cancel,browse
</param>
</interceptor-ref>
</interceptor-stack>
<!-- The completeStack is here for backwards compatibility for
applications that still refer to the defaultStack by the
old name -->
<interceptor-stack name="completeStack">
<interceptor-ref name="defaultStack" />
</interceptor-stack>
<!-- Sample execute and wait stack.
Note: execAndWait should always be the *last* interceptor. -->
<interceptor-stack name="executeAndWaitStack">
<interceptor-ref name="execAndWait">
<param name="excludeMethods">input,back,cancel</param>
</interceptor-ref>
<interceptor-ref name="defaultStack" />
<interceptor-ref name="execAndWait">
<param name="excludeMethods">input,back,cancel</param>
</interceptor-ref>
</interceptor-stack>
<!-- 未配置登陆验证的拦截栈 -->
<interceptor-stack name="otherStack">
<interceptor-ref name="exception" />
<interceptor-ref name="alias" />
<interceptor-ref name="servletConfig" />
<interceptor-ref name="i18n" />
<interceptor-ref name="prepare" />
<interceptor-ref name="chain" />
<interceptor-ref name="debugging" />
<interceptor-ref name="scopedModelDriven" />
<interceptor-ref name="modelDriven">
<param name="refreshModelBeforeResult">true</param>
</interceptor-ref>
<interceptor-ref name="fileUpload" />
<interceptor-ref name="checkbox" />
<interceptor-ref name="multiselect" />
<interceptor-ref name="staticParams" />
<interceptor-ref name="actionMappingParams" />
<interceptor-ref name="params">
<param name="excludeParams">
dojo\..*,^struts\..*
</param>
</interceptor-ref>
<interceptor-ref name="conversionError" />
<interceptor-ref name="validation">
<param name="excludeMethods">
input,back,cancel,browse
</param>
</interceptor-ref>
<interceptor-ref name="workflow">
<param name="excludeMethods">
input,back,cancel,browse
</param>
</interceptor-ref>
</interceptor-stack>
</interceptors>
<default-interceptor-ref name="needLoginStack"></default-interceptor-ref>
<global-results>
<result name="index">/index.jsp</result>
</global-results>
<action name="login" class="cn.com.action.LoginAction">
<result name="success">/success.jsp</result>
<result name="fail">/fail.jsp</result>
<!-- 很明显,登陆判断的Action并不需要判断是否登陆 -->
<interceptor-ref name="otherStack"></interceptor-ref>
</action>
<action name="user" class="cn.com.action.UserAction">
<result name="add">/addSuccess.jsp</result>
<!-- 除了登陆判断的Action,其他所有的Action都需要判断是否已经登陆,登陆方能操作 -->
<interceptor-ref name="needLoginStack"></interceptor-ref>
</action>
</package>
</struts>
6 .编写四个页面
(1)登陆页面index.jsp
<form action="system/login!login.action" method="post">
用户名:<input type="text" name="username"><br>
密码: <input type="password" name="password"><br>
<input type="submit" value="登陆">
</form>
(2) 登陆失败和成功页面
success.jsp
<h1> 登陆成功</h1><br>
<h1><a href="system/user!add.action"> 添加用户</a></h1><br>
fail.jsp
<center>
<h1>登陆失败</h1><br>
</center>
(3) 添加用户成功页面 addSuccess.jsp
<center>
<h1>添加一个用户成功</h1>
</center>
最后,启动服务器测试
输入用户名和密码admin可以登陆,可以添加用户
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