共四种方式：
其中前两种得到的是Map<String,Object> 后两种得到的才是真正的request对象
而Map就是把request对象中的属性取出做成了键值对而已。
【方法一】
public class LoginAction {
private Map request;
private Map session;
private Map application;
public String execute() {
request = (Map)ActionContext.getContext().get("request");
session = ActionContext.getContext().getSession();
application = ActionContext.getContext().getApplication();
request.put("username1", "jingjing1");
session.put("username2", "jingjing2");
application.put("username3", "jingjing3");
return "success";
}
}取出结果
<body>
<%
String username1 = (String)request.getAttribute("username1");
String username2 = (String)session.getAttribute("username2");
String username3 = (String)application.getAttribute("username3");
%>
<%=username1 %>
<%=username2 %>
<%=username3 %>
</body>【方法二】
public class LoginAction implements RequestAware,SessionAware,ApplicationAware {
private Map<String, Object> request;
private Map<String, Object> session;
private Map<String, Object> application;
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;
}
public String execute() {
request.put("username1", "jingjing11");
session.put("username2", "jingjing222");
application.put("username3", "jingjing33");
return "success";
}
}
【方法三】
public class LoginAction {
private HttpServletRequest request;
private HttpSession session;
private ServletContext application;
public String execute() {
request = ServletActionContext.getRequest();
session = request.getSession();
application = session.getServletContext();
//application = ServletActionContext.getRequest().getSession().getServletContext();
request.setAttribute("aaa", "aaa");
session.setAttribute("bbb", "bbb");
application.setAttribute("ccc", "ccc");
return "success";
}
}【方法四】
public class LoginAction 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();
this.application = session.getServletContext();
}
public String execute() {
request.setAttribute("111", "111");
session.setAttribute("222", "222");
application.setAttribute("333", "333");
return "success";
}
}HttpServletRequest方法总结:
HttpServletRequest接口是继承自ServletRequest接口的，增加了和HTTP相关的一些方法
getScheme() 方法返回请求的计划，比如http,https或者ftp.
getServerName() 方法返回被发送请求的服务器的主机名
getServerPort() 方法返回被发送请求的端口号。
getContextPath() 返回请求地址的根目录，以"/"开关，但不是以"/"结尾。
一个常用的获得服务器地址的连接字符串是：
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
getCookies() 取得cookie
getMethod() 取得请求方法，如get,post或put
getRequestURL() 取得请求URL(统一资源定位符)
getRequestURI() 取得请求URI(统一资源标识符)
getSession() 取得对应session
public HttpSession getSession();
public HttpSession getSession(boolean create);
返回与这个请求关联的当前的有效的session。如果调用这个方法时没带参数，那么在没有session与这个请求关联的情况下，将会新建一个session。如果调用这个方法时带入了一个布尔型的参数，只有当这个参数为真时，session才会被建立。
ServletRequestAware与RequestAware的区别
ServletRequestAware——提供对HttpServletRequest对象的访问
RequestAware ——通过Map来提供对所有request属性的访问
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原文地址：https://www.cnblogs.com/skiwnchqhh/p/10333988.html