一个struts1框架的小案例

Posted on 2022-05-18 22:28  quantumLQ  阅读(149)  评论(0编辑  收藏  举报

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>


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