正在装载数据…… 1.SessionFilter类,实现了Filter接口  package filters;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
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 ...{
  public void destroy() ...{
// TODO Auto-generated method stub
// System.out.println("** 过滤器销毁...") ;
 }
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException ...{
// TODO Auto-generated method stub
HttpServletRequest req = (HttpServletRequest)request ;
HttpSession session = req.getSession();
// if(session.getAttribute("loginname")!=null){ //暂时只过滤登陆名
// chain.doFilter(request,response);
// }else{
// // 通过requestDispatcher跳转到登陆页
// request.getRequestDispatcher("login.jsp").forward(request,response);
// }
try
...{
request.setCharacterEncoding("GBK");
String url= req.getRequestURI();
System.out.println(url);
if(session.getAttribute("loginname")!=null)...{ //暂时只过滤登陆名
chain.doFilter(request,response);
}else...{
if(url.indexOf("login.jsp")!=-1 || url.indexOf("login.do")!=-1)...{
chain.doFilter(request,response);
}else...{
// 通过requestDispatcher跳转到登陆页
request.getRequestDispatcher("login.jsp").forward(request,response);
}
}
}
catch (Exception ex)
...{
ex.printStackTrace();
}
}
public void init(FilterConfig config) throws ServletException ...{
// TODO Auto-generated method stub
// System.out.println("** 过滤器初始化...") ;
}
 }
2.配置web.xml,说明哪些文件需要过滤 <filter-name>SessionFilter</filter-name>
<filter-class>filters.SessionFilter</filter-class>
</filter>
<!-- ... -->
<filter-mapping>
<filter-name>SessionFilter</filter-name>
<url-pattern>/manager/*</url-pattern>
</filter-mapping> 搞定,洗个澡睡觉,明天开始写其他功能. 本文来源：http://blog.csdn.net/x03570227/archive/2007/07/11/1685879.aspx
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