Struts1登陆实例详解

这次开发项目中用的是Struts1，没办法，现在只能学习Struts1的相关知识。

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>

struts-confg.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>

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");
                
        }
}

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.
        }
}

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();
                }
        }
}

PasswordException.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{
}

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{
}