Servlet-Filter wird in einer Endlosumleitungsschleife ausgeführt, wenn der Benutzer nicht angemeldet ist
Ich habe zwei HTML-Dateien
login.html Test.htmlMeine Voraussetzung ist, dass der Benutzer nicht auf test.html zugreifen kann, es sei denn, er meldet sich erfolgreich über login.html an.
Dies ist meine login.html Datei
<html>
<head>
<title>Login Page 122</title>
</head>
<body>
<form action="LoginServlet" method="post">
Username: <input type="text" name="user">
<br>
Password: <input type="password" name="pwd">
<br>
<input type="submit" value="Login User">
</form>
</body>
</html>
Dies ist mein LoginServlet, das die Anfrage erhält, wenn auf die Schaltfläche "Senden" geklickt wird.
package com;
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private final String userID = "admin";
private final String password = "password";
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
String user = request.getParameter("user");
String pwd = request.getParameter("pwd");
if(userID.equals(user) && password.equals(pwd)){
HttpSession session = request.getSession();
session.setAttribute("user", "LoggedIN");
response.sendRedirect("LoginSuccess.jsp");
}else{
RequestDispatcher rd = getServletContext().getRequestDispatcher("/login.html");
PrintWriter out= response.getWriter();
out.println("<font color=red>Either user name or password is wrong.</font>");
rd.include(request, response);
}
}
}
Dies ist meine Filter-Klasse, die die * .html-Ressourcen schützt.
package com;
public class AuthenticationFilter implements Filter {
private ServletContext context;
public void init(FilterConfig fConfig) throws ServletException {
this.context = fConfig.getServletContext();
this.context.log("AuthenticationFilter initialized");
}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest) request;
HttpServletResponse res = (HttpServletResponse) response;
String uri = req.getRequestURI();
this.context.log("Requested Resource::"+uri);
HttpSession session = req.getSession(false);
if(session == null || !session.getAttribute("user").toString().equals("LoggedIN")){
this.context.log("Unauthorized access request");
System.out.println("Into session is null condition");
res.sendRedirect("login.html");
}else{
System.out.println("Into chain do filter");
chain.doFilter(request, response);
}
}
public void destroy() {
}
}
Und das ist meine web.xml-Datei
<?xml version="1.0" encoding="UTF-8"?>
<web-app>
<display-name>LoginFilter</display-name>
<servlet>
<description></description>
<display-name>LoginServlet</display-name>
<servlet-name>LoginServlet</servlet-name>
<servlet-class>com.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LoginServlet</servlet-name>
<url-pattern>/LoginServlet</url-pattern>
</servlet-mapping>
<servlet>
<description></description>
<display-name>LogoutServlet</display-name>
<servlet-name>LogoutServlet</servlet-name>
<servlet-class>com.LogoutServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LogoutServlet</servlet-name>
<url-pattern>/LogoutServlet</url-pattern>
</servlet-mapping>
<filter>
<display-name>AuthenticationFilter</display-name>
<filter-name>AuthenticationFilter</filter-name>
<filter-class>com.AuthenticationFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>AuthenticationFilter</filter-name>
<url-pattern>*.html</url-pattern>
</filter-mapping>
</web-app>
The Ausgabe, die ich sehe, ist, dass
Ich sehe diese Anweisung mehrmals in meiner Serverkonsole.
Into session is null condition
Into session is null condition
Into session is null condition
Into session is null condition
Into session is null condition
Into session is null condition
Into session is null condition
Into session is null condition
Into session is null condition
Into session is null condition
Into session is null condition
Into session is null condition
Into session is null condition