Servlet 中文乱码解决

自己最近在学servlet，遇到了servlet输出的时候出现乱码，后来在网上找了篇文章，解决了。
 
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.UnavailableException;
public class EncodingFilter implements Filter {
   protected String encoding = null;   
   protected FilterConfig filterConfig = null;
      public void destroy() { 
            this.encoding = null;   
                this.filterConfig = null; 
                  } 
    public void doFilter(ServletRequest request, ServletResponse response,
         FilterChain chain)
         throws IOException, ServletException {
   // Select and set (if needed) the character encoding to be used
         String encoding = selectEncoding(request);  
             if (encoding != null)        {    
                    request.setCharacterEncoding(encoding);
                           }
    // Pass control on to the next filter
           chain.doFilter(request, response); 
             }  
     public void init(FilterConfig filterConfig) throws ServletException {
     this.filterConfig = filterConfig; 
           this.encoding = filterConfig.getInitParameter("encoding");
               }  
      protected String selectEncoding(ServletRequest request) {
             return (this.encoding); 
               }
             }
 
再在web.xml中加入如下内容
  <filter>
  <filter-name>Set Character Encoding</filter-name>
  <filter-class>my.EncodingFilter</filter-class>
  <init-param>
  <param-name>encoding</param-name>
  <param-value>GBK</param-value></init-param>
  </filter>
  <filter-mapping>
  <filter-name>Set Character Encoding</filter-name>
  <url-pattern>/*</url-pattern>
  </filter-mapping>
 
这样问题就解决了my.EncodingFilter是EncodingFilter这个类在我的工程中的位置