过滤器的配置

web.xml:

<filter>
	<filter-name>CharacterEncodingFilter</filter-name>
	<filter-class>net.vschool.web.CharacterEncodingFilter</filter-class>
	<init-param>
		<param-name>encoding</param-name>
		<param-value>GBK</param-value>
	</init-param>
</filter>
<filter-mapping>
	<filter-name>CharacterEncodingFilter</filter-name>
	<url-pattern>/*</url-pattern>
</filter-mapping> 

CharacterEncodingFilter.java:

public class CharacterEncodingFilter implements Filter 
{ 

	protected String encoding = null; 

	public void init(FilterConfig filterConfig) throws ServletException 
	{
		this.encoding = filterConfig.getInitParameter("encoding");
	} 

	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException 
	{
		request.setCharacterEncoding(encoding);
		response.setContentType("text/html;charset="+encoding);
		chain.doFilter(request, response);
	} 
}