Web中request,session,application的获取(1)

jsp请求
<%@ page language="java" import="java.util.*" 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 '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>
	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>
 
struts.xml的配置
<?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.i18n.encoding" value="UTF-8"></constant>
<constant name="struts.ognl.allowStaticMethodAccess" value="true"></constant>
    <package name="login" extends="struts-default" namespace="/login">
        <action name="login*" class="com.lbx.action.LoginAction{1}">
            <result>/user_login_success.jsp</result>
        </action>
    </package>
    
</struts>
 

第一种直接获取,先通过(Map)ActionContext.getContext().get("request")获得request,得到request就可以获取session,获得session就可以获得application(注意都是map型的)
package com.lbx.action;

import java.util.Map;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

@SuppressWarnings("serial")
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; 
	}
}
 


第二中获取方式,通过实现接口获取,提供set方法就可以获取到(map型的)
package com.lbx.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.ActionSupport;

@SuppressWarnings("serial")
public class LoginAction2 extends ActionSupport implements RequestAware,
SessionAware,ApplicationAware{
	
	private Map<String, Object> request;
	private Map<String, Object> session;
	private Map<String, Object> application;
	
	public String execute() {
		request.put("r1", "r1");
		session.put("s1", "s1");
		application.put("a1", "a1");
		return SUCCESS; 
	}

	public void setRequest(Map<String, Object> request) {
		// TODO Auto-generated method stub
		this.request = request;
	}

	public void setSession(Map<String, Object> session) {
		// TODO Auto-generated method stub
		this.session = session;
	}

	public void setApplication(Map<String, Object> application) {
		// TODO Auto-generated method stub
		this.application = application;
	}

}
 

第三种获取方式,和第一种差不多,但是是获取到一个真实的类型而不是一个map类型的容器
package com.lbx.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;

@SuppressWarnings("serial")
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; 
	}
	
	
}
 



第四种获取方式,和第三种差不多,也是通过实现接口,但是这种是获取一个真实的类型而不是一个map容器
package com.lbx.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 void setServletRequest(HttpServletRequest request) {
		// TODO Auto-generated method stub
		this.request = request;
		this.session = request.getSession();
		application = session.getServletContext();
	}

	public String execute() {
		request.setAttribute("r1", "r1");
		session.setAttribute("s1", "s1");
		application.setAttribute("a1", "a1");
		return SUCCESS; 
	}
	
}
 



 

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