public class LoginCheckFilter implements Filter {
private FilterConfig config=null;
private String webroot=null;
public void destroy() {
// TODO Auto-generated method stub
}
@Override
public void doFilter(ServletRequest req, ServletResponse resp,
FilterChain chain) throws IOException, ServletException {
// TODO Auto-generated method stub
HttpServletRequest request=(HttpServletRequest)req;
HttpServletResponse response=(HttpServletResponse)resp;
HttpSession session=request.getSession(false); //取得當(dāng)前會(huì)話的session,沒(méi)有session也不創(chuàng)建session,同request.getSession()一樣
String url=request.getRequestURI(); //獲取當(dāng)前輸入的 /項(xiàng)目/當(dāng)前訪問(wèn)的路徑 與我們定義的路徑是否相同
if(url!=nullurl.equals(webroot+"/login.jsp")url.equals(webroot+"/LoginServlet")){
chain.doFilter(req,resp);
}else{
if(session==null){
response.sendRedirect(webroot+"/login.jsp");
}else{
String user2=(String)session.getAttribute("user1");
if(user2==null){
response.sendRedirect(webroot+"/login.jsp");
}else{
chain.doFilter(request, response);
}
}
}
}
@Override
public void init(FilterConfig config) throws ServletException {
// TODO Auto-generated method stub
this.config=config;
ServletContext ctx=config.getServletContext(); //獲取url /項(xiàng)目名
webroot=ctx.getContextPath(); //項(xiàng)目名
}
}
以上這篇jsp中過(guò)濾器選擇過(guò)濾器的寫(xiě)法詳解就是小編分享給大家的全部?jī)?nèi)容了，希望能給大家一個(gè)參考，也希望大家多多支持腳本之家。
