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struts1登录示例代码_动力节点Java学院整理

2019-11-26 11:32:11
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Struts1框架实例―登录实例:

1、实例开始工作―导入jar包,在官网上下载struts1框架包,解压之后导入工程的:

      2、之后配置web.xml(这里的具体配置方法可以参见struts1框架包中的实例文件夹webapps中的实例代码中web.xml文件的配置方法):  

    

     具体如下:     

<span style="font-size:18px;"><?xml version="1.0" encoding="UTF-8"?> <web-app version="2.4"  xmlns="http://java.sun.com/xml/ns/j2ee"  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee  http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">  <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/struts-config.xml</param-value>  </init-param>  <init-param>   <param-name>debug</param-name>   <param-value>2</param-value>  </init-param>  <init-param>   <param-name>detail</param-name>   <param-value>2</param-value>  </init-param>  <load-on-startup>2</load-on-startup>  </servlet>  <!-- Standard Action Servlet Mapping -->  <servlet-mapping>  <servlet-name>action</servlet-name>  <url-pattern>*.do</url-pattern>  </servlet-mapping> </web-app></span> 

        首先这个配置文件中最主要的就是做了两件的事情,一个是配置ActionServlet,一个是初始化struts-config.xml配置文件参数。 

       3、配置完了web.xml文件,之后我们就要开始进入项目代码阶段了。

       登录页面:      

<%@ page language="java" contentType="text/html; charset=GB18030"  pageEncoding="GB18030"%> <!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=GB18030"> <title>Insert title here</title> </head> <body>  <form action="login.do" method="post">   用户:<input type="text" name="username"><br>   密码:<input type="password" name="password"></br>   <input type="submit" value="登录">  </form> </body> </html>

       切记那个action后面的路径一定要是.do开头的,因为我们在web.xml中配置的是*.do。这里依旧不介绍为什么随后博客会深入分析。

      4、建立两个异常类,一个是用户名未找到、一个是密码错误:

      ①用户名未找到

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  } }

      ②密码错误 

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  } }

        5、业务处理类代码:

public class UserManager {  public void login(String username, String password) {   if (!"admin".equals(username)) {    throw new UserNotFoundException();   }    if (!"admin".equals(password)) {    throw new PasswordErrorException();   }    } }

       6、建立LoginActionForm类,这个类继承ActionForm类,简单说一下这个类,这个类主要是负责收集表单数据的,在这里一定要注意表单的属性必须和actionForm中的get和set方法的属性一致。这里依旧不深入解释,随后博客都会涉及到。       

import org.apache.struts.action.ActionForm; /**  * 登录ActionForm,负责表单收集数据  * 表单的属性必须和ActionForm中的get和set的属性一致  * @author Administrator  *  */ @SuppressWarnings("serial") 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;  }  }

       7、LoginAction类的建立,这个是负责取得表单数据、调用业务逻辑以及返回转向信息。        

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; /**  * 登录Action  * 负责取得表单数据、调用业务逻辑、返回转向信息  *  * @author Administrator  *  */ public class LoginAction extends Action {  @Override  public ActionForward execute(ActionMapping mapping, ActionForm form,    HttpServletRequest request, HttpServletResponse response)    throws Exception {   LoginActionForm laf=(LoginActionForm)form;   String username=laf.getUsername();   String password=laf.getPassword();   UserManager userManager=new UserManager();   try{    userManager.login(username, password);    return mapping.findForward("success");   }catch(UserNotFoundException e){    e.printStackTrace();    request.setAttribute("msg", "用户名不能找到,用户名称=["+username+"]");   }catch(PasswordErrorException e){    e.printStackTrace();    request.setAttribute("msg", "密码错误");   }   return mapping.findForward("error");   } }

      8、既然有转向,那么我们还要建立两个页面,一个是登录成功页面,一个登录失败页面。

           ①登录成功页面           

<%@ page language="java" contentType="text/html; charset=GB18030"  pageEncoding="GB18030"%> <!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=GB18030"> <title>Insert title here</title> </head> <body>  ${loginForm.username },登录成功 </body> </html>

           ②登录失败页面            

<%@ page language="java" contentType="text/html; charset=GB18030"  pageEncoding="GB18030"%> <!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=GB18030"> <title>Insert title here</title> </head> <body>  <%--  <%=request.getAttribute("msg") %>  --%>  ${msg } </body> </html>

       9、最后要进行struts-config.xml的配置。
        
<?xml version="1.0" encoding="ISO-8859-1" ?>  
<!DOCTYPE struts-config PUBLIC  
          "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN"  
          "http://jakarta.apache.org/struts/dtds/struts-config_1_2.dtd">  
<struts-config>  
    <form-beans>  
        <form-bean name="loginForm" type="com.bjpowernode.struts.LoginActionForm"/>  
    </form-beans>  
    <action-mappings>  
        <action path="/login"   
                type="com.bjpowernode.struts.LoginAction"  
                name="loginForm"          
                scope="request"       
                >  
            <forward name="success" path="/login_success.jsp" />  
            <forward name="error" path="/login_error.jsp"/>         
        </action>  
    </action-mappings>  
</struts-config>

       经过配置之后实例就已经做完了,感兴趣童鞋可以自己手动运行一下。

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