使用Struts1.x实现用户登录实例

红太狼 2022-06-04 00:14 192阅读 0赞

1.首先我们要将Struts1所需要的jar包导入到工程里。所需的jar包如下图：

![这里写图片描述][SouthEast]

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2.新建Login.jsp，放在WebContent目录下。

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<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <%  
        String basePath = request.getContextPath();  
    %> 
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Insert title here</title>
    
    </head>
    <body>
    	<h1>登陆页面</h1>  
        <hr>  
        <form action="<%=basePath %>/Login.do" method="post" >  
            userName:<input id="name" name="name" type="text" /><br>  
            passWord:<input id="password" name="password" type="password" /><br>  
            <input type="submit" id="submit" name="submit" value="submit" />  
        </form> 
    </body>
    </html>

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3.新建LoginSuccess.jsp，同样放在WebContent目录下。

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>登录成功</title>
    </head>
    <body>
    	<h1>登录成功页面！</h1>
    	<h3>欢迎[<%=request.getAttribute("name") %>]</h3>
    </body>
    </html>

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4.新建LoginFailed.jsp，同样放在WebContent目录下。

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>登录失败</title>
    </head>
    <body>
    	<h1>登录失败!</h1>
    	请返回<a href="/StrutsDemo/Login.jsp">登录页面。</a>
    </body>
    </html>

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5.编写AactionForm，用来存储登录用户的名字和密码，注意这里必须要继承`org.apache.struts.action.ActionForm`。主要是对应Login.jsp的表单。  
但是有一点必须要注意，这个Form里的字段名字必要和前台Login.jsp里表单的名字保持一致！

代码如下：

package com.lanp.webapp.form;
    
    import org.apache.struts.action.ActionForm;  
    
    public class LoginActionForm extends ActionForm{
    
    	private String name;
    	private String 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;
    	}
    }

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6.编写Action，取名为LoginAction，是用户登录的Action，必须要继承Action类。这个LoginAction里我们重写一下execute()方法，这个execute()方法其实有点类似Servlet里的Service()方法，或者是DoPost()，DoGet()方法。

代码如下：

package com.lanp.webapp.action;
    
    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;  
    
    import com.lanp.webapp.form.LoginActionForm;  
    
    public class LoginAction extends Action{
    
        @Override  
        public ActionForward execute(ActionMapping mapping, ActionForm form,  
                HttpServletRequest request, HttpServletResponse response)  
                throws Exception {  
            String path = "error";  
            LoginActionForm loginActionForm = (LoginActionForm)form;  
            String userName = loginActionForm.getName();
            String passWord = loginActionForm.getPassword();
            
            if("admin".equals(userName) && "admin".equals(passWord)) {  
                path = "success";  
                request.setAttribute("name", userName);  
            } else {  
                path = "error";  
            }  
            return mapping.findForward(path);  
        } 
    }

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7.接下来就是配置web.xml和struts-config.xml这两个文件，是整个Struts的核心。

*  配置struts-config.xml。在WEB-INF目录地下新建一个conf的文件件，将struts-config.xml放在里面。struts-config.xml主要配置Action和ActionForm的对应关系。所有的配置参数都要放在`<struts-config>`这个根标签下才可以。

<?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://struts.apache.org/dtds/struts-config_1_2.dtd">  
    <struts-config>
    	<form-beans>
    		
    		
    		<form-bean name="LoginActionForm" type="com.lanp.webapp.form.LoginActionForm">
    		</form-bean>
    	</form-beans>
    	
    	<action-mappings>
    		
    		<action path="/Login" 
    		name="LoginActionForm" 
    		type="com.lanp.webapp.action.LoginAction"
    		scope="request">
    		<forward name="login" path="/Login.jsp"></forward>
    		<forward name="success" path="/LoginSuccess.jsp"></forward>
    		<forward name="error" path="/LoginFailed.jsp"></forward>
    		</action>
    	</action-mappings>
    	
    </struts-config>

*  配置web.xml，这个文件主要是配置ActionServlet。ActionServlet本质也是一个Servlet，但这里的ActionServlet是Struts1的总控制器，是Struts1自带的，不用我们手动去写。ActionServlet也是整个Struts的入口，在第一次访问Struts的时候创建，并调用ActionServlet里的init方法来初始化一些参数。其实这个过程就是读取struts-config.xml配置好的参数来进行初始化资源。

<?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>StrutsDemo</display-name>
      <welcome-file-list>
        <welcome-file>index.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/conf/struts-config.xml</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>

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8.最后贴上整个工程的截图：  
![这里写图片描述][SouthEast 1]

[SouthEast]: /images/20220604/363bff7873ea4b6690ccc96b9b252894.png
[SouthEast 1]: /images/20220604/59ffed8768a84d6187c7a2616a7786b0.png