jsp乱码问题&代码

package com.helloworld.servletImple.filter;
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;
public class setEncodingFilter implements Filter {
public void destroy(){

}
public void doFilter(ServletRequest request,ServletResponse response,FilterChain chain)
throws IOException,ServletException{
//将request内的对象设置为字符集为utf-8
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
chain.doFilter(request,response);
}
public void init(FilterConfig arg0) throws ServletException{

}
}

<filter>
<filter-name>encoding</filter-name>
<filter-class>com.helloworld.servletImple.filter.setEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>utf-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>