用Enterprise 开发JSP,怎么写过滤器filter来过滤登入验证,比如管理员文件夹admin,怎么过滤里面的所有页面,而不是一个一个页面单独过滤,这样的过滤器怎么写,还麻烦大家能把过滤代码贴出来,详细点,还要把web.xml里的配置也告诉下,一定要详细,最好能一步一步告诉我,急啊,谢谢各位了
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http://www.family168.com/oa/springsecurity/html
package com.company.servlet;import java.io.IOException;
import java.io.PrintWriter;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.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class AdminFilter extends HttpServlet implements Filter { public void doFilter(ServletRequest arg0, ServletResponse arg1,
FilterChain arg2) throws IOException, ServletException {
// 未登陆用户禁止访问后台的任何页面
HttpServletRequest request = (HttpServletRequest) arg0;
Object user = request.getSession().getAttribute("usermodel");
if (null == user || "".equals(user)) {
// 直接到登陆截面
request.getRequestDispatcher("/admin/backlogin.jsp").forward(arg0, arg1);
} else {
arg2.doFilter(arg0, arg1);
} } public void init(FilterConfig arg0) throws ServletException {
// TODO Auto-generated method stub } /**
* Constructor of the object.
*/
public AdminFilter() {
super();
} /**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}}
web.xml配置
<!--过滤是否用户已登录 -->
<filter>
<filter-name>AdminFilter</filter-name>
<filter-class>com.company.servlet.AdminFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>AdminFilter</filter-name>
<url-pattern>/admin/pages/*</url-pattern>
</filter-mapping>
AdminFilter 类名
com.company.servlet.AdminFilter 路径