1 package sanglp.servlet; 2 3 import javax.servlet.*; 4 import javax.servlet.annotation.WebFilter; 5 import javax.servlet.annotation.WebInitParam; 6 import javax.servlet.http.HttpServletRequest; 7 import javax.servlet.http.HttpSession; 8 import java.io.IOException; 9 10 11 12 /** 13 * Created by Administrator on 2016/10/5. 14 */ 15 @WebFilter(filterName = "authority",urlPatterns = {"/*"},initParams = { 16 @WebInitParam(name = "encoding",value = "UTF-8"), 17 @WebInitParam(name = "loginPage",value = "/chap2/login.jsp"), 18 @WebInitParam(name = "proLogin", value="/chap2/proLogin.jsp") 19 }) 20 public class AuthorityFilter implements Filter { 21 //用于访问Filter的配置信息 22 private FilterConfig config; 23 24 @Override 25 public void init(FilterConfig filterConfig) throws ServletException { 26 this.config=filterConfig; 27 } 28 29 @Override 30 public void destroy() { 31 this.config=null; 32 } 33 34 @Override 35 public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { 36 //获取该Filter的配置参数 37 String encoding=config.getInitParameter("encoding"); 38 String loginPage=config.getInitParameter("loginPage"); 39 String proLogin=config.getInitParameter("proLogin"); 40 //设置request编码用的字符集 41 servletRequest.setCharacterEncoding(encoding); 42 HttpServletRequest hreq=(HttpServletRequest) servletRequest; 43 HttpSession session=hreq.getSession(true); 44 //获取客户请求的页面 45 String requestPath=hreq.getServletPath(); 46 //如果session范围的user为null即表明没有邓丽。且用户请求的既不是登录页面,也不是处理登录的页面 47 if(session.getAttribute("user")==null&&!requestPath.endsWith(loginPage)&&!requestPath.endsWith(proLogin)){ 48 servletRequest.setAttribute("tip","您还没有登录"); 49 servletRequest.getRequestDispatcher(loginPage).forward(servletRequest,servletResponse); 50 51 }else{ 52 //履行请求 53 filterChain.doFilter(servletRequest,servletResponse); 54 } 55 } 56 }