在Web.xml中定义自己的过滤器

 1 package com.zkj.filter;
 2 
 3 import java.io.IOException;
 4 import java.io.PrintWriter;
 5 
 6 import javax.servlet.Filter;
 7 import javax.servlet.FilterChain;
 8 import javax.servlet.FilterConfig;
 9 import javax.servlet.ServletException;
10 import javax.servlet.ServletRequest;
11 import javax.servlet.ServletResponse;
12 import javax.servlet.http.HttpServlet;
13 import javax.servlet.http.HttpServletRequest;
14 import javax.servlet.http.HttpServletResponse;
15 
16 public class MyFilter extends HttpServlet implements Filter {
17 
18     public void doFilter(ServletRequest arg0, ServletResponse arg1,
19             FilterChain arg2) throws IOException, ServletException {
20         // TODO Auto-generated method stub
21         arg0.setCharacterEncoding("utf-8");
22         arg2.doFilter(arg0, arg1);
23     }
24 
25     public void init(FilterConfig arg0) throws ServletException {
26         // TODO Auto-generated method stub
27         
28     }
29 
30 }