过滤器权限校验

向右看齐 2021-11-23 03:31 282阅读 0赞

package com.web.study;
    
    import java.io.IOException;
    import javax.servlet.FilterChain;
    import javax.servlet.FilterConfig;
    import javax.servlet.RequestDispatcher;
    import javax.servlet.ServletException;
    import javax.servlet.ServletRequest;
    import javax.servlet.ServletResponse;
    import javax.servlet.Filter;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import javax.servlet.http.HttpSession;
    
    public class PermissionFilter implements Filter {
    
    	public PermissionFilter() {
    		
    	}
    
    	private FilterConfig filterConfig;
    
    	public void init(FilterConfig filterConfig) throws ServletException {
    		
    	}
    
    	public void doFilter(ServletRequest req, ServletResponse res, FilterChain filterChain) throws IOException,ServletException {
    
    		HttpServletRequest request = (HttpServletRequest)req;
    		HttpServletResponse response = (HttpServletResponse)res;
    		
    		String servletPath = request.getServletPath();
    		HttpSession session = request.getSession();
    		String flag = (String)session.getAttribute("flag");
    		
    		if (servletPath.equals("/Jsp/logon.jsp")||servletPath.equals("/Jsp/index.jsp")||servletPath.equals("/LoginServlet")) {
    			filterChain.doFilter(req, res);
    		}
    		else {
    			if(flag!=null&&flag.equals("login_success")){
    				filterChain.doFilter(req, res);
    			}
    			else if (flag!=null && flag.equals("login_error")) {
    				request.setAttribute("return_uri", servletPath);
    				RequestDispatcher rd = request.getRequestDispatcher("/Jsp/login.jsp");
    				rd.forward(request, response);
    			}
    			else {
    				request.setAttribute("return_uri", servletPath);
    			    RequestDispatcher rd = request.getRequestDispatcher("/Jsp/login.jsp");
    			    rd.forward(request, response);
    			}
    			
    		}
    		
    		
    	}
    
    	public void destroy() {
    
    	}
    }

转载于:https://www.cnblogs.com/wzz1020/p/4687343.html