appendfilter.java

利用servlet写的用户注册登陆

package com.tarena.filter;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class AppendFilter extends HttpFilter {

	@Override
	public void doFilter(HttpServletRequest request,
			HttpServletResponse response, FilterChain chain)
			throws IOException, ServletException {
		MemoryResponseWrapper wrapper = new MemoryResponseWrapper(response);
		chain.doFilter(request, wrapper);
		String contents = wrapper.getContents();
		PrintWriter out = response.getWriter();
		out.println(contents);
		out.println("<hr>");
		out.println("this is by filter.");
		out.close();
	}

}