Struts1简单登陆详解

废话不说直接上代码，重点内容已注释

 

struts-config.xml

<?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> <!-- 注册ActionForm--> <form-beans> <!-- name：名称 type：类路径--> <form-bean name="loginForm" type="com.login.LoginForm"></form-bean> </form-beans> <!-- 设置URL逻辑名称（全局），而且必须写在Action前面，任何Action都可以识别--> <global-forwards> <forward name="result" path="/result.jsp"></forward> </global-forwards> <!-- 注册Action--> <action-mappings> <!-- name：名称 type：类路径 path：客户端提交到服务器端时制定的路径（Form表单中的action="/login.do")--> <action path="/login" type="com.login.LoginAction" name="loginForm" scope="request"> <!--设置URL逻辑名称（局部），只有这个Action可以识别到，然后将结果返回到指定的页面--> <forward name="success" path="/login_success.jsp"></forward> <forward name="error" path="/login_error.jsp"></forward> </action> <action path="/beanWrite" type="com.tag.BeanWriteAction"> <forward name="success" path="/tag_beanwrite.jsp"></forward> </action> <action path="/logic" type="com.tag.LogicAction"> <forward name="success" path="/tag_logic.jsp"></forward> </action> <action path="/iterator" type="com.tag.IteratorAction"> <forward name="success" path="/tag_iterator.jsp"></forward> </action> </action-mappings> </struts-config> 

web.xml

<?xml version="1.0" encoding="UTF-8"?> <web-app 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" version="2.5"> <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> <load-on-startup>2</load-on-startup> </servlet> <servlet-mapping> <servlet-name>action</servlet-name> <url-pattern>*.do</url-pattern> </servlet-mapping> </web-app> 

index.jsp

<%-- Created by IntelliJ IDEA. User: wangchenyang Date: 2010-11-30 Time: 10:12:18 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head><title>Simple jsp page</title></head> <body> <form action="" method="post" name="myForm"> 用户名：<input type="text" name="username" /><br> 密码：<input type="password" name="password" /> <br> <input type="button" value="测试登陆" onclick="javascript:document.myForm.action='/login.do';document.myForm.submit();"> <input type="button" value="测试BeanWrite标签" onclick="javascript:document.myForm.action='/beanWrite.do';document.myForm.submit();"> <input type="button" value="测试Logic标签" onclick="javascript:document.myForm.action='/logic.do';document.myForm.submit();"> <input type="button" value="测试Iterator标签" onclick="javascript:document.myForm.action='/iterator.do';document.myForm.submit();"> </form> </body> </html> 

LoginForm.java

package com.login; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionMapping; import org.apache.struts.action.ActionErrors; import javax.servlet.http.HttpServletRequest; /** * Created by IntelliJ IDEA. * User: wangchenyang * Date: 2010-11-30 * Time: 10:18:47 * 保存表单提交的值 * 必须继承 org.apache.struts.action.ActionForm * 必须编写和表单元素同名的属性，并且要有get()何set() 比如说表单中有username何password属性 * 必须在Struts1配置文件中进行注册 */ public class LoginForm extends ActionForm { private String username; 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; } private String password; @Override public void reset(ActionMapping mapping, HttpServletRequest request) { System.out.println("----------reset()--------------"); super.reset(mapping,request); } @Override public ActionErrors validate(ActionMapping mapping, HttpServletRequest request) { System.out.println("-------validate()----------"); return super.validate(mapping, request); //To change body of overridden methods use File | Settings | File Templates. } }  

LoginAction.java

package com.login; import org.apache.struts.action.Action; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; import org.apache.struts.action.ActionForm; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * Created by IntelliJ IDEA. * User: wangchenyang * Date: 2010-11-30 * Time: 10:24:42 *负责接收ActionForm中的数据，并作出处理 * 必须继承 org.apache.struts.action.Action * 重写execute()处理业务逻辑 * 将Action注册到配置文件中 */ public class LoginAction extends Action { /** * ActionForward：封装了跳转目标的路径 * mapping：访问配置文件 * form：传过来的ActionForm对象 * @param mapping * @param form * @param request * @param response * @return * @throws Exception */ @Override public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception { LoginForm lf= (LoginForm) form; String username=lf.getUsername(); //String username=request.getParameter("username");用此方法同样可以得到表单中的值，但如果用到Struts标签的话就必须用ActionForm了 String password=lf.getPassword(); String errorInfo=""; try{ UserManager.getInstance().login(username,password); request.setAttribute("username",username); //跳转 return mapping.findForward("success"); }catch(UserNotFoundException unfe){ unfe.printStackTrace(); errorInfo="用户不存在,输入的用户名=["+username+"]"; }catch(PasswordErrorException pee){ pee.printStackTrace(); errorInfo="密码错误"; } request.setAttribute("errorInfo",errorInfo); return mapping.findForward("error"); } }  

UserManager.java

package com.login; /** * Created by IntelliJ IDEA. * User: wangchenyang * Date: 2010-11-30 * Time: 10:36:03 * To change this template use File | Settings | File Templates. */ public class UserManager { private static UserManager instance=new UserManager(); public static UserManager getInstance() { return instance; } public void login(String username,String password){ if(!"admin".equals(username)){ throw new UserNotFoundException(); } if(!"admin".equals(password)){ throw new PasswordErrorException(); } } }  

UserNotFoundException.java

package com.login; /** * Created by IntelliJ IDEA. * User: wangchenyang * Date: 2010-11-30 * Time: 10:39:25 * To change this template use File | Settings | File Templates. */ public class UserNotFoundException extends RuntimeException{ }  

PasswordErrorException.java

package com.login; /** * Created by IntelliJ IDEA. * User: wangchenyang * Date: 2010-11-30 * Time: 10:39:48 * To change this template use File | Settings | File Templates. */ public class PasswordErrorException extends RuntimeException{ }