struts-config.xml配置文件的scope
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2022-07-01 10:55:43
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一 scope说明
指定ActionForm Bean的存在范围，可选取request和session，默认是session。
二 通过request取数据
1 LoginAction
package com.cakin.actions;
//这是一个action（表示小队长，需要继承Action）
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;
import com.cakin.forms.UserForm;
public class LoginAction extends Action {
//我们需要重新编写一个方法：execute会被自动调用，有点类似servlet的service方法。
@Override
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
//把form转成对应的UserForm对象
UserForm userForm=(UserForm)form;
//简单验证
if("123".equals(userForm.getPassword())){
//把名字存放到request对象域
//request.setAttribute("username", userForm.getUsername());
return mapping.findForward("ok");
}
else{
return mapping.findForward("err");
}
}
}
2 wel.jsp
<%@ page language="java" import="java.util.*" import="com.cakin.forms.*" pageEncoding="utf-8"%>
<%
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 'wel.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>
welcome <%=((UserForm)request.getAttribute("userForm")).getUsername() %> <br>
<a href="/strutslogin/">返回重新登录</a>
</body>
</html>
3 struts-config.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.3//EN" "http://struts.apache.org/dtds/struts-config_1_3.dtd";>
<struts-config>
<!-- 配置表单 -->
<form-beans>
<!-- name是表单名字，可以随意写，但我们建议取名规范，表单为类名小写 -->
<!-- type用于指定表单类全路径 -->
<form-bean name="userForm" type="com.cakin.forms.UserForm"></form-bean>
</form-beans>
<action-mappings>
<!-- name用于关联某个表单-->
<!-- type用于指定该action类全路径-->
<!-- request表示该action对应的表单对象的生命周期request=request.setAttribute("userForm",userForm)-->
<!-- session表示该action对应的表单对象的生命周期session=request.getSession.setAttribute("userForm",userForm)-->
<action path="/login" name="userForm" scope="request" type="com.cakin.actions.LoginAction">
<!-- 这里配置跳转关系-->
<!--name表示结果名称 path：转发到哪个页面 -->
<forward name="ok" path="/WEB-INF/wel.jsp"></forward>
<forward name="err" path="/WEB-INF/err.jsp"></forward>
</action>
</action-mappings>
</struts-config>
三 测试结果
四 通过session取数据
1 struts-config.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.3//EN" "http://struts.apache.org/dtds/struts-config_1_3.dtd";>
<struts-config>
<!-- 配置表单 -->
<form-beans>
<!-- name是表单名字，可以随意写，但我们建议取名规范，表单为类名小写 -->
<!-- type用于指定表单类全路径 -->
<form-bean name="userForm" type="com.cakin.forms.UserForm"></form-bean>
</form-beans>
<action-mappings>
<!-- name用于关联某个表单-->
<!-- type用于指定该action类全路径-->
<!-- request表示该action对应的表单对象的生命周期request=request.setAttribute("userForm",userForm)-->
<!-- session表示该action对应的表单对象的生命周期session=request.getSession.setAttribute("userForm",userForm)-->
<action path="/login" name="userForm" type="com.cakin.actions.LoginAction">
<!-- 这里配置跳转关系-->
<!--name表示结果名称 path：转发到哪个页面 -->
<forward name="ok" path="/WEB-INF/wel.jsp"></forward>
<forward name="err" path="/WEB-INF/err.jsp"></forward>
</action>
</action-mappings>
</struts-config>
2 wel.jsp
<%@ page language="java" import="java.util.*" import="com.cakin.forms.*" pageEncoding="utf-8"%>
<%
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 'wel.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>
welcome <%=((UserForm)session.getAttribute("userForm")).getUsername() %> <br>
<a href="/strutslogin/">返回重新登录</a>
</body>
</html>
五 测试结果
