使用Filter访问Session信息
2007-12-23 12:35:41 来源:WEB开发网核心提示:import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletContext;import javax.servlet.ServletE
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.Httpsession;
public class SessionFilter implements Filter {
PRivate FilterConfig config;
/** Creates new SessionFilter */
public SessionFilter() {
}
public void init(FilterConfig filterConfig) throws ServletException {
System.out.println("Instance created of " + getClass().getName());
this.config = filterConfig;
}
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws java.io.IOException, ServletException {
HttpSession session = ((HttpServletRequest) request).getSession();
ServletContext context = config.getServletContext();
/*
* use the ServletContext.log method to log filter messages
*/
context.log("doFilter called in: " + config.getFilterName() + " on "
+ (new java.util.Date()));
// log the session ID
context.log("session ID: " + session.getId());
// Find out whether the logged-in session attribute is set
String logged = (String) session.getAttribute("logged-in");
if (logged == null)
session.setAttribute("logged-in", "no");
//log a message about the log-in status
context.log("log-in status: "
+ (String) session.getAttribute("logged-in"));
context.log("");
chain.doFilter(request, response);
}
public void destroy() {
/*
* called before the Filter instance is removed from service by the web
* container
*/
}
}
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.Httpsession;
public class SessionFilter implements Filter {
PRivate FilterConfig config;
/** Creates new SessionFilter */
public SessionFilter() {
}
public void init(FilterConfig filterConfig) throws ServletException {
System.out.println("Instance created of " + getClass().getName());
this.config = filterConfig;
}
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws java.io.IOException, ServletException {
HttpSession session = ((HttpServletRequest) request).getSession();
ServletContext context = config.getServletContext();
/*
* use the ServletContext.log method to log filter messages
*/
context.log("doFilter called in: " + config.getFilterName() + " on "
+ (new java.util.Date()));
// log the session ID
context.log("session ID: " + session.getId());
// Find out whether the logged-in session attribute is set
String logged = (String) session.getAttribute("logged-in");
if (logged == null)
session.setAttribute("logged-in", "no");
//log a message about the log-in status
context.log("log-in status: "
+ (String) session.getAttribute("logged-in"));
context.log("");
chain.doFilter(request, response);
}
public void destroy() {
/*
* called before the Filter instance is removed from service by the web
* container
*/
}
}
(出处:http://www.cncms.com)
[]
- ››使用脚本恢复WinXP系统的用户登录密码
- ››使用phpMyadmin创建数据库及独立数据库帐号
- ››使用Zend Framework框架中的Zend_Mail模块发送邮件...
- ››使用cout标准输出如何控制小数点后位数
- ››使用nofollow标签做SEO的技巧
- ››使用 WebSphere Message Broker 的 WebSphere Tra...
- ››使用SQL Server事件探查器做应用程序的性能分析
- ››使用SQL Server事件探查器分析死锁原因
- ››使用纯文本文件打造WCF服务
- ››使用 Dojo 开发定制 Business Space 小部件,第 4...
- ››使用 ADDRESS 与 INDIRECT函数查询信息
- ››使用 COLUMN函数编制单元信息
更多精彩
赞助商链接