通过过滤器判定用户权限.
第一步:建立UserPermissionFilter类.
import Javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import test.system.SysUserApi;
import test.vo.SysUserVO;
import test.system.dao.SysUserDao;
import test.Const;
public class UserPermissionFilter extends HttpServlet implements Filter {
protected FilterConfig filterConfig = null;
public void destroy() {
this.filterConfig = null;
}
public void doFilter(
ServletRequest request,
ServletResponse response,
FilterChain filterChain) throws IOException, ServletException {
try {
HttpServletRequest req = (HttpServletRequest) request;
SysUserVO userSession = new SysUserVO();
userSession = (SysUserVO)req.getSession().getAttribute(Const.SESSION_USER);
if (userSession == null) {
HttpServletResponse rep = (HttpServletResponse) response;
rep.sendRedirect("/admin/login.jsp");
}else{
filterChain.doFilter(request, response);
}
}
catch (Exception e) {}
}
public void init(FilterConfig filterConfig) throws ServletException {
this.filterConfig = filterConfig;
}
public FilterConfig getFilterConfig() {
return filterConfig;
}
public void setFilterConfig(FilterConfig filterConfig) {
this.filterConfig = filterConfig;
}
}
第二步:配置WEB.XML文件
设置过滤器:
<filter>
<filter-name>userpermission</filter-name>
<filter-class>sports.tools.UserPermissionFilter</filter-class>
</filter>
设置过滤器映射,因为过滤器不能过滤全部的程序,所以可以用列表的形式来增加需要过滤的文件.如下.一个过滤器可以过滤多个映射文件.
<filter-mapping>
<filter-name>userpermission</filter-name>
<url-pattern>/admin/index.jsp</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>userpermission</filter-name>
<url-pattern>/admin/edit/*</url-pattern>
</filter-mapping>
