用struts2实现简单的登录

来源：互联网发布：put call parity 知乎编辑：程序博客网时间：2024/06/06 16:45

首先先写一个简单的的登录界面，代码如下：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><%@ taglib prefix="s" uri="/struts-tags" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">    <title>登录</title>    <meta http-equiv="pragma" content="no-cache">    <meta http-equiv="cache-control" content="no-cache">    <meta http-equiv="expires" content="0">        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">    <meta http-equiv="description" content="This is my page">    <!--    <link rel="stylesheet" type="text/css" href="styles.css">    -->  </head>  <body>      <s:form action="login">          <s:textfield name="username" key="用户名"/>          <s:textfield name="password" key="密码"/>          <s:submit key="登录dd"/>      </s:form>  </body></html>

然后，写一个Action，命名为LoginAction,代码如下

package com.dhy.action;import com.opensymphony.xwork2.ActionContext;import com.opensymphony.xwork2.ActionSupport;public class LoginAction extends ActionSupport{    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;    }    @Override    public String execute() throws Exception {        System.out.println(getUsername()+getPassword());        // TODO Auto-generated method stub        ActionContext ctx=ActionContext.getContext();        //通过ActionContext访问application范围的属性值        Integer counter=(Integer)ctx.getApplication().get("counter");        if(counter==null){            counter=1;        }else{            counter=counter+1;        }        ctx.getApplication().put("counter", counter);        //通过ActionContext设置session范围的属性        ctx.getSession().put("user", username);        if(getUsername().equals("jocean")&&getPassword().equals("jocean")){            //通过ActionContext设置request范围的属性            System.out.println("in");            ctx.put("tip","服务器提示:您已经登录成功");            return  SUCCESS;        }      //通过ActionContext设置request范围的属性        ctx.put("tip", "服务器提示：登录失败！");        return  ERROR;    }}

配置struts2.xml，其配置如下

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"    "http://struts.apache.org/dtds/struts-2.3.dtd"><struts>    <!-- 指定全局国际化资源文件 -->    <!-- add -->  <!--   <constant name="struts.custom.i18n.resources" value="mess"/> -->    <!-- End -->    <!-- <constant name="struts.enable.DynamicMethodInvocation" value="false" />    <constant name="struts.devMode" value="true" /> -->    <package name="crazyit" namespace="/" extends="struts-default">          <action name="login" class="com.dhy.action.LoginAction">              <result name="error">/WEB-INF/content/error.jsp</result>              <result name="success">/WEB-INF/content/success.jsp</result>          </action>    </package> <!--    <include file="example.xml"/> -->    <!-- Add packages here --></struts>

然后，写success.jsp和error.jsp,其中success.jsp的代码如下：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">    <title>成功页面</title>    <meta http-equiv="pragma" content="no-cache">    <meta http-equiv="cache-control" content="no-cache">    <meta http-equiv="expires" content="0">        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">    <meta http-equiv="description" content="This is my page">    <!--    <link rel="stylesheet" type="text/css" href="styles.css">    -->  </head>  <body>       访问次数:${applicationScope.counter}<br/>       ${sessionScope.user},您已经登录！<br/>       ${requestScope.tip}   </body></html>

error.jsp的代码如下：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">    <title>My JSP 'error.jsp' starting page</title>    <meta http-equiv="pragma" content="no-cache">    <meta http-equiv="cache-control" content="no-cache">    <meta http-equiv="expires" content="0">        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">    <meta http-equiv="description" content="This is my page">    <!--    <link rel="stylesheet" type="text/css" href="styles.css">    -->  </head>  <body>    ${requestScope.tip}  </body></html>

web.xml的配置如下:

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5"     xmlns="http://java.sun.com/xml/ns/javaee"     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee     http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">   <!-- struts2配置 ,添加过滤器，如果是通过工具添加，会自动生成-->  <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>  <!-- End --></web-app>

目录结构如下图所示：
这里写图片描述
运行结果如下：

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