struts1实现简单的登录功能（附源码）

环境：MyEclipse 14 发布时间： 2017-04-20 21:04:55

1 struts1 框架搭建

在MyEclipse新建web project 取名为struts1_login，此时是一个空文档就不截图了然后在project上右键->选择myeclipse->add struts capabilities

单击上面Install Apache Struts(1.x)Facet

点击next

选择*.do ，改下包名改成与你项目相关的。如我的包名为com.lichang.struts1

点击next

点击完成，在我们的WEB-INF下就会多出struts-config.xml文件

以上就是让myeclipse帮我们加入框架的大概过程。项目的整体结构如下：

至此我们的struts1 框架搭建完成

2 接着我们就开始编程来实现了。

web.xml 如下：

<?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" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">

  <display-name>struts1_login</display-name>

  <welcome-file-list>

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

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

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

    <welcome-file>default.html</welcome-file>

    <welcome-file>default.htm</welcome-file>

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

  </welcome-file-list>

  <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>

    <init-param>

      <param-name>debug</param-name>

      <param-value>3</param-value>

    </init-param>

    <init-param>

      <param-name>detail</param-name>

      <param-value>3</param-value>

    </init-param>

    <load-on-startup>0</load-on-startup>

  </servlet>

  <servlet-mapping>

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

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

  </servlet-mapping>

</web-app>

然后在struts.xml配置LoginAction 代码如下：

<?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="loginForm" type="com.lichang.struts1.LoginActionForm"/>

    </form-beans>

    <action-mappings>

    <!-- path:指定访问时的路径   type：指定Action所在的类（一般是：包名.类名） name：指定和哪个表单（和jsp中Javabean

    差不多的东西）对应，该例中name就和com.lichang.struts1.LoginActionForm类对应-->

        <action path="/login"

                type="com.lichang.struts1.LoginAction"

                name="loginForm"

                scope="request"

                >

            <forward name="success" path="/login_success.jsp" />

            <forward name="error" path="/login_error.jsp"/>

        </action>

    </action-mappings>

  <message-resources parameter="com.lichang.struts1.ApplicationResources" />

</struts-config>

index.jsp代码如下：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html style="text-align:center">
<head style="text-align:center">

<title>index page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">

</head>

login_error.jsp代码如下：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <title>error page</title>

    <meta http-equiv="pragma" content="no-cache">

    <meta http-equiv="cache-control" content="no-cache">

    <meta http-equiv="expires" content="0">

    <!--

    <link rel="stylesheet" type="text/css" href="styles.css">

    -->

  </head>

  <body>

        <%--

    <%=request.getAttribute("msg") %>

    --%>

    ${msg }

  </body>

</html>

login_success.jsp代码如下：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <title>success page</title>

    <meta http-equiv="pragma" content="no-cache">

    <meta http-equiv="cache-control" content="no-cache">

    <meta http-equiv="expires" content="0">    

    <!--

    <link rel="stylesheet" type="text/css" href="styles.css">

    -->

  </head>

  <body>

     ${username },登录成功

  </body>

</html>

LoginAction.java代码如下：

package com.lichang.struts1;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionForward;

import org.apache.struts.action.ActionMapping;

//这个类充当控制器

public class LoginAction extends Action {

    public ActionForward execute(ActionMapping mapping, ActionForm form,

            HttpServletRequest request, HttpServletResponse response)

            throws Exception {

        //从actionForm中获取username和password

        LoginActionForm laf = (LoginActionForm)form;

        String username = laf.getUsername();

        String password = laf.getPassword();

        //调用业务逻辑类

        UserManager userManager = new UserManager();

        try {

            userManager.login(username, password);

            return mapping.findForward("success");

        }catch(UserNotFoundException e) {

            e.printStackTrace();

            request.setAttribute("msg", "用户不能找到，用户名称=" + username );

        }catch(PasswordErrorException e) {

            e.printStackTrace();

            request.setAttribute("msg", "密码错误");

        }

        return mapping.findForward("error");

    }

}

LoginActionForm.java代码如下：

package com.lichang.struts1;

import org.apache.struts.action.ActionForm;

/**

 *

 * ActionForm(表单用于获取用户输入的数据，相当于jsp中的Javabean)

 * 不过sturts1在底层上实现了一些特别的方法以至于当Java程序员定义了Javabean并继承ActionForm并实现setXXX()方法时

 * 用户表单中元素的值就被一一赋给我们自己定义的变量。如public void setUsername(String username)方法就可把form中username

 * 赋给username变量

 *

 */

public class LoginActionForm extends ActionForm {

    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;

    }

}

UserManager.java代码如下：

package com.lichang.struts1;

//这个类就是用来处理用户登录的业务逻辑

public class UserManager {

    public void login(String username, String password) {

        if (!"admin".equals(username)) {

            throw new UserNotFoundException();

        }

        if (!"admin".equals(password)) {

            throw new PasswordErrorException();

        }

    }

}

UserNotFoundException.java代码如下：

package com.lichang.struts1;

public class UserNotFoundException extends RuntimeException {

    public UserNotFoundException() {

        // TODO Auto-generated constructor stub

    }

    public UserNotFoundException(String message) {

        super(message);

        // TODO Auto-generated constructor stub

    }

    public UserNotFoundException(Throwable cause) {

        super(cause);

        // TODO Auto-generated constructor stub

    }

    public UserNotFoundException(String message, Throwable cause) {

        super(message, cause);

        // TODO Auto-generated constructor stub

    }

}

PasswordErrorException.java代码如下：

package com.lichang.struts1;

public class PasswordErrorException extends RuntimeException {

    public PasswordErrorException() {

        // TODO Auto-generated constructor stub

    }

    public PasswordErrorException(String message) {

        super(message);

        // TODO Auto-generated constructor stub

    }

    public PasswordErrorException(Throwable cause) {

        super(cause);

        // TODO Auto-generated constructor stub

    }

    public PasswordErrorException(String message, Throwable cause) {

        super(message, cause);

        // TODO Auto-generated constructor stub

    }

}

运行部分截图

登录界面
用户名不存在
源代码下载地址：http://files.cnblogs.com/files/li-chang/struts1_login.zip