ActionForward的使用

1、理解全局和局部ActionForward的概念
2、redirect的使用
3、struts-config.xml文件不允许动态修改
4、理解动态ActionForward，动态的ActionForward是可以运行期修改的


LoginAction.java

package com.bjsxt.struts;

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;

/**
 * 用户登录的Action
 * @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();
//		if ("admin".equals(username) && "admin".equals(password)) {
//			//转向到登录成功页面
//			request.setAttribute("username", username);
//			return mapping.findForward("success");
//		}else {
//			//转向到登录失败页面
//			return mapping.findForward("error");
//		}
		String errorInfo = "";
		try {
			UserManager.getInstance().login(username, password);
			//request.setAttribute("username", username);
			request.getSession().setAttribute("user", username);
			return mapping.findForward("success");
		}catch(UserNotFoundException unfe) {
			unfe.printStackTrace();
			errorInfo = "用户不能找到，用户名称=[" + username + "]";
		}catch(PasswordErrorException pee) {
			pee.printStackTrace();
			errorInfo = "密码错误";
		}
		request.setAttribute("errorinfo", errorInfo);
		return mapping.findForward("error");
	}

}

LoginActionForm.java

package com.bjsxt.struts;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;

/**
 * 登录的ActionForm，ActionForam是做数据收集的，
 * 
 * ActionForm中的属性必须和表单中输入域的名称一致
 * @author Administrator
 *
 */
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;
	}
	
	@Override
	public void reset(ActionMapping mapping, HttpServletRequest request) {
		System.out.println("----------LoginActionForm.reset()-----------");
	}

	@Override
	public ActionErrors validate(ActionMapping mapping,
			HttpServletRequest request) {
		System.out.println("----------LoginActionForm.validate()-----------");
		return null;
	}
	
}

UserManager.java

package com.bjsxt.struts;

public class UserManager {

	private static UserManager instance = new UserManager();
	
	private 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();
		}
	}
	
}

MustLoginAction.java

package com.bjsxt.struts;

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;

public class MustLoginAction extends Action {

	@Override
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {
		
		if (request.getSession().getAttribute("user") == null) {
			
			ActionForward af = mapping.findForward("login");
			
			//struts-config.xml文件不能修改
			//af.setRedirect(false);
			return af;
			
			//重定向
			//response.sendRedirect(request.getContextPath() + "/login.jsp");
			//return null;
		}
		return mapping.findForward("success");
	}

}

DynaActionForwardTestAction.java

package com.bjsxt.struts;

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;

public class DynaActionForwardTestAction extends Action {

	@Override
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {
		
		String page = request.getParameter("page");
//		ActionForward af = null;
//		if ("1".equals(page)) {
//			af = mapping.findForward("page1");
//		}else if ("2".equals(page)) {
//			af = mapping.findForward("page2");
//		}
//		return af;
		ActionForward af = new ActionForward();
		af.setPath("/page" + page + ".jsp?name=Tom");
		return af;
	}

}

PasswordErrorException.java

package com.bjsxt.struts;

public class PasswordErrorException extends RuntimeException {

}

UserNotFoundException.java

package com.bjsxt.struts;

public class UserNotFoundException extends RuntimeException {

}

struts-config.xml

<?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.bjsxt.struts.LoginActionForm"/>
	</form-beans>
	
	<global-forwards>
		<forward name="login" path="/login.jsp" redirect="true"/>
	</global-forwards>
	
	<action-mappings>
		<action path="/login"
				type="com.bjsxt.struts.LoginAction"
				name="loginForm"
				scope="request"
				validate="false"
		>
			<forward name="success" path="/login_success.jsp"/>
			<forward name="error" path="/login_error.jsp"/>
		</action>
		
		<action path="/mustlogin"
				type="com.bjsxt.struts.MustLoginAction"
		>
			<!-- 
			<forward name="login" path="/login.jsp" redirect="true"/>
			 -->
			<forward name="success" path="/mustlogin.jsp"/>
		</action>
		
		<action path="/dynaactionforward"
				type="com.bjsxt.struts.DynaActionForwardTestAction"	
		>
		<!-- 
			<forward name="page1" path="/page1.jsp"/>
			<forward name="page2" path="/page2.jsp"/>
		 -->	
		</action>
	</action-mappings>
</struts-config>

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
  </head>
  
  <body>
    <a href="login.jsp">登录</a><br>
    <a href="mustlogin.do">访问受保护的页面</a><br>
    <p>
    <li>动态ActionForward测试</li><br>
    <form action="dynaactionforward.do" method="post">
    	页面：<input type="text" name="page"><br>
    	<input type="submit" value="提交">
    </form>
  </body>
</html>

login.jsp

<%@ 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>用户登录</title>
</head>
<body>
	<h1>用户登录</h1>
	<hr>
	<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>

login_error.jsp

<%@ 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>登录失败</title>
</head>
<body>
	<%=request.getAttribute("errorinfo") %>
</body>
</html>

login_success.jsp

<%@ page language="java" contentType="text/html; charset=GB18030"
    pageEncoding="GB18030"%>
<%@ page import="com.bjsxt.struts.*" %>    
<!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>登录成功</title>
</head>
<body>
	<%
		LoginActionForm laf = (LoginActionForm)request.getAttribute("loginForm");
	%>
	<%=laf.getUsername() %>,登录成功
</body>
</html>

mustlogin.jsp

<%@ 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>
这个是一个受保护的页面
</body>
</html>

page1.jsp

<%@ 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>
page1
</body>
</html>

page2.jsp

<%@ 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>
page2
</body>
</html>

page3.jsp

<%@ 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>
page3
</body>

</html>