Structs复习 访问web元素
Structs帮我们在action和http里建立了联系
主要有四种方式 我们主要用第二种（IOC 依赖容器注入 ）
Jar包
web.XML
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" 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"> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>
Struct.xml(每次换类名
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <constant name="struts.devMode" value="true" /> <package name="login" extends="struts-default" namespace="/login"> <action name="login*" class="com.bjsxt.struts2.user.action.LoginAction{1}"> <result>/user_login_success.jsp</result> </action> </package> </struts>
拿的时候
index.jsp
<?xml version="1.0" encoding="GB18030" ?> <%@ page language="java" contentType="text/html; charset=GB18030" pageEncoding="GB18030"%> <% String context = request.getContextPath(); %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=GB18030" /> <title>Insert title here</title> </head> <body> 取得Map类型request,session,application,真实类型 HttpServletRequest, HttpSession, ServletContext的引用: <ol> <li>前三者：依赖于容器</li> <li>前三者：IOC</li> (只用这种) <li>后三者：依赖于容器</li> <li>后三者：IOC</li> </ol> <br /> <form name="f" action="" method="post"> 用户名：<input type="text" name="name"/> 密码：<input type="text" name="password"/> <br /> <input type="button" value="submit1" onclick="javascript:document.f.action='login/login1';document.f.submit();" /> <input type="button" value="submit2" onclick="javascript:document.f.action='login/login2';document.f.submit();" /> <input type="button" value="submit3" onclick="javascript:document.f.action='login/login3';document.f.submit();" /> <input type="button" value="submit4" onclick="javascript:document.f.action='login/login4';document.f.submit();" /> </form> </body> </html>
user_login_success.jsp
<?xml version="1.0" encoding="GB18030" ?> <%@ page language="java" contentType="text/html; charset=GB18030" pageEncoding="GB18030"%> <%@taglib uri="/struts-tags" prefix="s" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=GB18030" /> <title>Insert title here</title> </head> <body> User Login Success! <br /> <s:property value="#request.r1"/> | <%=request.getAttribute("r1") %> <br /> <s:property value="#session.s1"/> | <%=session.getAttribute("s1") %> <br /> <s:property value="#application.a1"/> | <%=application.getAttribute("a1") %> <br /> <s:property value="#attr.a1"/><br /> //不常用 无法精确的知道到底存在哪里 他是吧request application session 的全部存在里面 <s:property value="#attr.s1"/><br /> <s:property value="#attr.r1"/><br /> <s:debug></s:debug> <br /> </body> </html>
先介绍第一种‘
LoginAction1
package com.bjsxt.struts2.user.action; import java.util.Map; import com.opensymphony.xwork2.ActionContext; import com.opensymphony.xwork2.ActionSupport; public class LoginAction1 extends ActionSupport { private Map request; private Map session; private Map application; public LoginAction1() { request = (Map)ActionContext.getContext().get("request"); session = ActionContext.getContext().getSession(); application = ActionContext.getContext().getApplication(); } public String execute() { request.put("r1", "r1"); session.put("s1", "s1"); application.put("a1", "a1"); return SUCCESS; } }
第二种： IOC控制反转 依赖于容器
LoginAction2
package com.bjsxt.struts2.user.action; import java.util.Map; import org.apache.struts2.interceptor.ApplicationAware; import org.apache.struts2.interceptor.RequestAware; import org.apache.struts2.interceptor.SessionAware; import com.opensymphony.xwork2.ActionContext; import com.opensymphony.xwork2.ActionSupport; public class LoginAction2 extends ActionSupport implements RequestAware,SessionAware, ApplicationAware { private Map<String, Object> request; private Map<String, Object> session; private Map<String, Object> application; //DI dependency injection //IoC inverse of control public String execute() { request.put("r1", "r1"); session.put("s1", "s1"); application.put("a1", "a1"); return SUCCESS; } @Override public void setRequest(Map<String, Object> request) { this.request = request; } @Override public void setSession(Map<String, Object> session) { this.session = session; } @Override public void setApplication(Map<String, Object> application) { this.application = application; } }
第三种
LoginAction3
package com.bjsxt.struts2.user.action; import javax.servlet.ServletContext; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpSession; import org.apache.struts2.ServletActionContext; import com.opensymphony.xwork2.ActionSupport; public class LoginAction3 extends ActionSupport { private HttpServletRequest request; private HttpSession session; private ServletContext application; public LoginAction3() { request = ServletActionContext.getRequest(); session = request.getSession(); application = session.getServletContext(); } public String execute() { request.setAttribute("r1", "r1"); session.setAttribute("s1", "s1"); application.setAttribute("a1", "a1"); return SUCCESS; } }
第四种 IOC
package com.bjsxt.struts2.user.action; import javax.servlet.ServletContext; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpSession; import org.apache.struts2.interceptor.ServletRequestAware; import com.opensymphony.xwork2.ActionSupport; public class LoginAction4 extends ActionSupport implements ServletRequestAware { private HttpServletRequest request; private HttpSession session; private ServletContext application; public String execute() { request.setAttribute("r1", "r1"); session.setAttribute("s1", "s1"); application.setAttribute("a1", "a1"); return SUCCESS; } @Override public void setServletRequest(HttpServletRequest request) { this.request = request; this.session = request.getSession(); this.application = session.getServletContext(); } }
LoginAction4
