权限管理过滤器，filter，session，页面或者哪个文件下的所有页面进行登陆过滤
2007-12-27 22:39JAVA源文件：
package org.filter.system;
import java.io.IOException;
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.*;
import javax.servlet.*;
import org.bean.SessionBean;
/**
* Title: LOGIN FILTER.
*
* Description: System user login servlet filter.
*
* Copyright: Copyright (c) 2007/10/05
*
* Company: JaMing SoftRoom
*
* @author: Jamee
*
* @version 1.0
*/
public class SysLoginFilter implements Filter{
FilterConfig config;
public void init(FilterConfig config)throws ServletException
{
this.config=config;
}
public void doFilter(ServletRequest request,ServletResponse response,
FilterChain chain)throws IOException,ServletException
{
HttpServletRequest hreq=(HttpServletRequest)request;
HttpServletResponse hrep=(HttpServletResponse)response;
request.setCharacterEncoding("GBK");
HttpSession session=hreq.getSession();
String back="default.jsp";
RequestDispatcher dispatcher=hreq.getRequestDispatcher(back);
try{
SessionBean user=(SessionBean)session.getAttribute("user");
boolean login=user.getIsLogin();
if(login)
{
chain.doFilter(request,response);
}else{
dispatcher.forward(request,response);
}
}catch(Exception e){
dispatcher.forward(request,response);
}
}
public void destroy(){}
}
－－－－附SessionBean.java源文件－－－－－－－－－－－－
package org.bean;
/**
* Title: Session.
*
* Description: Session.
*
* Copyright: Copyright (c) 2007/9/27
*
* Company: JaMing SoftRoom
*
* @author: Jamee
*
* @version 1.0
*/
public class SessionBean
{
int QX=4;
String LOGIN_NAME;
boolean IS_LOGIN=false;
public void SessionBean(){}
public void setLoginName(String name)
{
this.LOGIN_NAME=name;
}
public void setIsLogin(boolean l)
{
this.IS_LOGIN=l;
}
public void setQX(int i)
{
this.QX=i;
}
public String getLoginName()
{
return this.LOGIN_NAME;
}
public boolean getIsLogin()
{
return this.IS_LOGIN;
}
public int getQX()
{
return this.QX;
}
public String getAdmin()
{
String admin=null;
int i=getQX();
if(i==0)admin="系统管理员";
if(i==1)admin="行政管理员";
if(i==2)admin="教务管理员";
if(i==3)admin="德育管理员";
if(i==4)admin="游客";
return admin;
}
}
－－－－－－－附web.xml配置－－－－－－－－－
<filter>
<filter-name>ADMIN SESSION FILTER</filter-name>
<filter-class>org.filter.system.SysLoginFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>ADMIN SESSION FILTER</filter-name>
<url-pattern>/admin/*</url-pattern>
</filter-mapping>
解释：
如果你要对哪个页面或者哪个文件下的所有页面进行登陆过滤的话，只需要在<url-pattern></url-pattern>中写入相对路径就可以了．
所有程序都已经调试没有任何错误！
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