main/java/TestFilter.java



import java.io.IOException;

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.HttpServletRequestWrapper;


/**
 * Servlet Filter implementation class TestFilter
 */
public class TestFilter implements Filter {
        
        class CustomRequest extends HttpServletRequestWrapper {

                HttpServletRequest request;
                
                public CustomRequest(HttpServletRequest request) {
                        super(request);
                        this.request = request;
                }

                
                @Override
                public String getRemoteAddr() {
                        String header = request.getHeader("x-forwarded-for"); 
                        if ( header != null) {
                                return header;
                        } else {
                                return request.getRemoteAddr();
                        }
                }

                @Override
                public String getRemoteHost() {
                        return getRemoteAddr();
                }

                
        }

    /**
     * Default constructor. 
     */
    public TestFilter() {
        // TODO Auto-generated constructor stub
    }

        /**
         * @see Filter#destroy()
         */
        public void destroy() {
                // TODO Auto-generated method stub
        }

        /**
         * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
         */
        public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {

                HttpServletRequest req = (HttpServletRequest) request;
                
                chain.doFilter(new CustomRequest(req), response);
        }

        /**
         * @see Filter#init(FilterConfig)
         */
        public void init(FilterConfig fConfig) throws ServletException {
                // TODO Auto-generated method stub
        }

}
1	torben	2516
2
3			import java.io.IOException;
4
5			import javax.servlet.Filter;
6			import javax.servlet.FilterChain;
7			import javax.servlet.FilterConfig;
8			import javax.servlet.ServletException;
9			import javax.servlet.ServletRequest;
10			import javax.servlet.ServletResponse;
11			import javax.servlet.http.HttpServletRequest;
12			import javax.servlet.http.HttpServletRequestWrapper;
13
14
15			/**
16			* Servlet Filter implementation class TestFilter
17			*/
18			public class TestFilter implements Filter {
19
20			class CustomRequest extends HttpServletRequestWrapper {
21
22			HttpServletRequest request;
23
24			public CustomRequest(HttpServletRequest request) {
25			super(request);
26			this.request = request;
27			}
28
29
30			@Override
31			public String getRemoteAddr() {
32			String header = request.getHeader("x-forwarded-for");
33			if ( header != null) {
34			return header;
35			} else {
36			return request.getRemoteAddr();
37			}
38			}
39
40			@Override
41			public String getRemoteHost() {
42			return getRemoteAddr();
43			}
44
45
46			}
47
48			/**
49			* Default constructor.
50			*/
51			public TestFilter() {
52			// TODO Auto-generated constructor stub
53			}
54
55			/**
56			* @see Filter#destroy()
57			*/
58			public void destroy() {
59			// TODO Auto-generated method stub
60			}
61
62			/**
63			* @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
64			*/
65			public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
66
67			HttpServletRequest req = (HttpServletRequest) request;
68
69			chain.doFilter(new CustomRequest(req), response);
70			}
71
72			/**
73			* @see Filter#init(FilterConfig)
74			*/
75			public void init(FilterConfig fConfig) throws ServletException {
76			// TODO Auto-generated method stub
77			}
78
79			}