samplefilter.java

是JSP、Servlet的一个示例程序

/*
 * Created on 2005-3-7
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
package test;

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;

/**
 * @author yangbing
 * 
 * TODO To change the template for this generated type comment go to Window -
 * Preferences - Java - Code Style - Code Templates
 */
public class SampleFilter implements Filter {

    public void init(FilterConfig config) throws ServletException {
        System.out.println("in SampleFilter init method!!!");
    }

    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
        System.out.println("in filter doFilter method!!!");
        request.setAttribute("testkey", "testfilter");
        request.setCharacterEncoding("ISO-8859-1");
        System.out.println("after change data!!!");
        chain.doFilter(request, response);
    }

    public void destroy() {
        System.out.println("destroy this filter");
    }

}