Java Servlet Filter does not work at login

Question

I wrote a filter class to add a P3P header to every page. I added this to my web.xml:

<filter>
    <filter-name>AddP3pHeaderFilter</filter-name>
    <filter-class>com.mycompany.AddP3pHeaderFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>AddP3pHeaderFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

It adds a title for each page request, but it does not work when the user first logs in. The user submits the form j_security_check, but the response does not include the header. How can I apply a filter to an entry request?

Answer 1

Doesn't work in Tomcat.

In the end, I had to use Tomcat valves.

Answer 2

. REQUEST. web.xml :

<filter>
    <filter-name>AddP3pHeaderFilter</filter-name>
    <filter-class>com.mycompany.AddP3pHeaderFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>AddP3pHeaderFilter</filter-name>
    <url-pattern>/*</url-pattern>
    <dispatcher>REQUEST</dispatcher>
    <dispatcher>FORWARD</dispatcher>
</filter-mapping>

EDIT: , , .

Answer 3

- /j_security_check - . , .

- HttpSession, , .

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) {
    HttpServletRequest httpRequest = (HttpServletRequest) request;
    UserPrincipal user = httpRequest.getUserPrincipal();
    HttpSession session = httpRequest.getSession();
    if (user != null && session.getAttribute("user") == null) {
        session.setAttribute("user", user);

        // First-time login. You can do your intercepting thing here.
    }
    chain.doFilter(request, response);
}

Answer 4

I don't know about tomcat, but it works for me at the pier, just put a filter in front of the spring filter:

<filter>
    <filter-name>AddP3pHeaderFilter</filter-name>
    <filter-class>com.mycompany.AddP3pHeaderFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>AddP3pHeaderFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

<filter>
    <filter-name>springSecurityFilterChain</filter-name>
    <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>

<filter-mapping>
  <filter-name>springSecurityFilterChain</filter-name>
  <url-pattern>/*</url-pattern>
</filter-mapping>

Answer 5

My web.xml

<filter>
        <description>
        FBIS Filter</description>
        <display-name>Fbisfilter</display-name>
        <filter-name>Fbisfilter</filter-name>
        <filter-class>fbis.filter.Fbisfilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>Fbisfilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

and myfilter

package fbis.filter;

import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.sqlconnection.SQLConnect;
import com.sun.security.auth.UserPrincipal;

import fbis.interfaces.abstractclasses.Connections;

/**
 * Servlet Filter implementation class Fbisfilter
 */
public class Fbisfilter extends Object implements Filter,Connections {
    public void destroy() {
    //  System.out.println("Filter Service finished");
    }
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest httpRequest = (HttpServletRequest) request;
        HttpServletResponse httpresponse = (HttpServletResponse) response;
        System.out.println("FILTER INSIDE");
    // place your code here
        HttpSession session = httpRequest.getSession(true);
        String usrid = httpRequest.getParameter("txtuname");
        String pwd = httpRequest.getParameter("txtpassword");
        PreparedStatement pstmt;
        try {
            pstmt = con
                    .prepareStatement("SELECT l.Userid,n.First_name from Login_details_dtls l join New_Registration_dtls n on l.Userid=n.Userid where n.Userid=? AND l.pwd=?");
        pstmt.setString(1, usrid);
        pstmt.setString(2, pwd);
        ResultSet rs = pstmt.executeQuery();
        if (rs.next()) {
            session.setAttribute("usr", rs.getString("Userid"));
            session.setAttribute("usrname", rs.getString("First_name"));
        }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        chain.doFilter(httpRequest, httpresponse);
    }

    /**
     * @see Filter#init(FilterConfig)
     */
    public void init(FilterConfig fConfig) throws ServletException {
        System.out.println("Filter Service has started");
    }

}