LoginAction
package k.action;

import k.form.UserForm;

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionForward;

import org.apache.struts.action.ActionMapping;

import org.apache.struts.actions.DispatchAction;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class LoginAction extends DispatchAction {

    public ActionForward userLogin(ActionMapping mapping, ActionForm form,

                                   HttpServletRequest request, HttpServletResponse response) throws Exception {

        return mapping.findForward("login");

    }

    public ActionForward doUserLogin(ActionMapping mapping, ActionForm form,

                                   HttpServletRequest request, HttpServletResponse response) throws Exception {

        UserForm userForm = (UserForm) form;

        if ("1".equals(userForm.getPassword())) {

            return mapping.findForward("ok");

        } else {

            return mapping.findForward("err");

        }

    }

    public ActionForward userLoginOut(ActionMapping mapping, ActionForm form,

                                      HttpServletRequest request, HttpServletResponse response) throws Exception {

        request.getSession().invalidate();

        System.out.println("userLoginOut");

        return mapping.findForward("login");

    }

    public ActionForward userLoginOut2(ActionMapping mapping, ActionForm form,

                                      HttpServletRequest request, HttpServletResponse response) throws Exception {

        request.getSession().invalidate();

        System.out.println("userLoginOut2");

        return mapping.findForward("login");

    }

}

struts-config.xml 

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

<!DOCTYPE struts-config PUBLIC

        "-//Apache Software Foundation//DTD Struts Configuration 1.3//EN"

        "http://struts.apache.org/dtds/struts-config_1_3.dtd">

<struts-config>

    <form-beans>

        <form-bean name="userForm" type="k.form.UserForm"></form-bean>

    </form-beans>

    <action-mappings>

        <action name="userForm" path="/login" parameter="action" type="k.action.LoginAction"

                scope="request" attribute="userForm" input="index.jsp" validate="false">

            <forward name="ok" path="/WEB-INF/jsp/ok.jsp"></forward>

            <forward name="err" path="/WEB-INF/jsp/err.jsp"></forward>

            <forward name="login" path="/WEB-INF/jsp/login.jsp"></forward>

        </action>

    </action-mappings>

</struts-config>

login.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<html>

<head>

    <title>Title</title>

</head>

<body>

<h1>登录页面</h1>

<form action="${APP_PATH}/login.do?action=doUserLogin" method="post">

    账号：<input type="text" name="userName" value="11哈哈"> <br>

    密码： <input type="password" name="password" value="1"> <br>

    <input type="submit" value="submit"> <br>

</form>

</body>

</html>
web.xml
<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"

         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"

         version="3.1">

    <servlet>

        <servlet-name>action</servlet-name>

        <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>

        <init-param>

            <param-name>config</param-name>

            <param-value>/WEB-INF/struts-config.xml</param-value>

        </init-param>

        <load-on-startup>2</load-on-startup>

    </servlet>

    <servlet-mapping>

        <servlet-name>action</servlet-name>

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

    </servlet-mapping>

    <welcome-file-list>

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

    </welcome-file-list>

    <filter>

        <filter-name>EncodingFilter</filter-name>

        <filter-class>k.filter.EncodingFilter</filter-class>

    </filter>

    <filter-mapping>

        <filter-name>EncodingFilter</filter-name>

        <url-pattern>/*</url-pattern>

    </filter-mapping>

    <listener>

        <display-name>StartSystemListener</display-name>

        <listener-class>k.filter.StartSystemListener</listener-class>

    </listener>

</web-app>
EncodingFilter
package k.filter;

import javax.servlet.*;

import javax.servlet.http.HttpServlet;

import java.io.IOException;

public class EncodingFilter extends HttpServlet implements Filter {

    @Override

    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse,

                         FilterChain filterChain) throws IOException, ServletException {

        servletRequest.setCharacterEncoding("utf-8");

        servletResponse.setCharacterEncoding("utf-8");

        // System.out.println("========== set utf-8 ok ==========");

        filterChain.doFilter(servletRequest, servletResponse);

    }

    @Override

    public void init(FilterConfig filterConfig) throws ServletException {

    }

}
StartSystemListener
package k.filter;

import javax.servlet.ServletContext;

import javax.servlet.ServletContextEvent;

import javax.servlet.ServletContextListener;

public class StartSystemListener implements ServletContextListener {

    @Override

    public void contextInitialized(ServletContextEvent sce) {

        //1.将项目上下文路径(request.getContextPath())放置到application域中.

        ServletContext application = sce.getServletContext();

        String app_path = application.getContextPath();

        application.setAttribute("APP_PATH", app_path);

        System.out.println("========== APP_PATH = " + app_path);

        WebHelper.setApp_Path(app_path);

    }

    @Override

    public void contextDestroyed(ServletContextEvent sce) {

    }

}
WebHelper
package k.filter;

public class WebHelper {

    public static String getApp_Path() {

        return APP_PATH;

    }

    public static void setApp_Path(String appPath) {

        APP_PATH = appPath;

    }

    private static String APP_PATH = "";

}
UserForm
package k.form;

import org.apache.struts.action.ActionForm;

public class UserForm extends ActionForm {

private String name;

    private String password;

    public UserForm() {

    }

    public UserForm(String name, String password) {

        this.name = name;

        this.password = password;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public String getPassword() {

        return password;

    }

    public void setPassword(String password) {

        this.password = password;

    }

}

err.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<html>

<head>

    <title>Title</title>

</head>

<body>

<h1>登录失败</h1>

<a href="${APP_PATH}/login.do?action=userLogin">返回登录</a>

</body>

</html>

ok.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<html>

<head>

    <title>Title</title>

</head>

<body>

<h1>登录失败</h1>

<a href="${APP_PATH}/login.do?action=userLogin">返回登录</a>

</body>

</html>

index,jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<html>

  <head>

    <title>$Title$</title>

  </head>

  <body>

<jsp:forward page="WEB-INF/jsp/login.jsp"></jsp:forward>

  </body>

</html>

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