过滤器--过滤编码

在servlet3.0中可以在页面配置
 1 @WebFilter(
 2         filterName= "encodingFilter" , 
 3         urlPatterns = {"/*"} , 
 4         initParams = { @WebInitParam(name ="encoding" , value= "utf-8")} ,
 5         asyncSupported = true
 6         )
 7 public class EncodingFilter implements Filter{
 8     private String encoding = null;
 9     @Override
10     public void destroy() {
11         
12         
13     }
14 
15     @Override
16     public void doFilter(ServletRequest request, ServletResponse response,
17             FilterChain chain) throws IOException, ServletException {
18         request.setCharacterEncoding(encoding);
19         response.setCharacterEncoding(encoding);
20         response.setContentType("text/html");
21         chain.doFilter(request, response);
22     }
23 
24     @Override
25     public void init(FilterConfig config) throws ServletException {
26         encoding = config.getInitParameter("encoding");
27         System.out.println("过滤字符编码");
28     }
29 
30 }