【Struts 分派Action】DispatchAction

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 {

    }
}

View Code

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) {

    }
}

View Code

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 = "";

}

View Code

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;
    }
}

View Code

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>

View Code

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>

View Code

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>

View Code

【Struts 分派Action】DispatchAction

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