Servlet之间通信的方式有两大类，每个类有三种不同的方法
1.request
2.session
3.application
不实现ServletContextAware,SessionAware,ServletRequestAware这三个接口的通信
HttpServletRequest request = ServletActionContext.getRequest();
request.setAttribute("request_username", "username");
HttpServletResponse response = ServletActionContext.getResponse(); //这个是Servlet的session
// HttpSession session = request.getSession();
// session.setAttribute("session_username", "username");
ServletContext servletContext = ServletActionContext.getServletContext();
servletContext.setAttribute("application_username", "username");
实现ServletContextAware,SessionAware,ServletRequestAware这三个接口的通信
public class Servlet2Action extends ActionSupport implements
ServletContextAware,SessionAware,ServletRequestAware { private HttpServletRequest request;
private ServletContext servletContext;
private Map<String,Object> sessionMap; /**
* {}struts2包装以后的session,本质上是一个map
org.apache.catalina.core.ApplicationContextFacade@72898540 servlet中的application
org.apache.struts2.dispatcher.StrutsRequestWrapper@228b677f struts2包装后的request
*/
public void setSession(Map<String, Object> arg0) {
this.sessionMap=arg0;
sessionMap.
}
public void setServletContext(ServletContext arg0) {
this.servletContext=arg0;
} public void setServletRequest(HttpServletRequest arg0) {
this.request=arg0;
}
public String testServelet()
{
System.out.println(sessionMap.toString());
System.out.println(servletContext.toString());
System.out.println(request.toString());
return "servelet";
} }
在目标页面取出
request:${requestScope.request_username }<br>
session:${sessionScope.session_username }<br>
application:${applicationScope.application_username }<br>