java.io.IOException: Unsupported encoding GBK

because my ftl show chinese is wrong ,so I imitate the following menthod,but the error appear.I want to know how to show chinese right.I use sitemesh+freemarker+webwork

<filter>
<filter-name>sitemesh</filter-name>
<filter-class>com.opensymphony.module.sitemesh.filter.PageFilter</filter-class>
</filter>
<filter>
<filter-name>ResponseCharSetFilter</filter-name>
<display-name>ResponseCharSetFilter</display-name>
<filter-class>com.opensymphony.module.sitemesh.filter.ResponseCharSetFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>text/html;charset=gb2312</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>sitemesh</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>ResponseCharSetFilter</filter-name>
<url-pattern>*.htm</url-pattern>
</filter-mapping>


the filter code is :
----------------------------------------------------------
package com.opensymphony.module.sitemesh.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;
/**
* @web.filter display-name="ResponseCharSetFilter" name="ResponseCharSetFilter"
* @web.filter-init-param name="encoding" value="text/html;charset=gb2312"
*/
public final class ResponseCharSetFilter implements Filter {
private String encoding;
protected void doFilterInternal(ServletRequest request,
ServletResponse response, FilterChain filterChain)
throws ServletException, IOException {
filterChain.doFilter(request, response);
response.setContentType(encoding);
System.out.println("..." + encoding);
}
public void init(FilterConfig config) throws ServletException {
encoding = config.getInitParameter("encoding");
}
public void doFilter(ServletRequest arg0, ServletResponse arg1,
FilterChain arg2) throws IOException, ServletException {
this.doFilterInternal(arg0, arg1, arg2);
}
public void destroy() {
}
}

the error is:
java.io.IOException: Unsupported encoding GBK
	at com.opensymphony.module.sitemesh.filter.TextEncoder.get14Buffer(TextEncoder.java:64)
	at com.opensymphony.module.sitemesh.filter.TextEncoder.encode(TextEncoder.java:37)
	at com.opensymphony.module.sitemesh.filter.Buffer.parse(Buffer.java:43)
	at com.opensymphony.module.sitemesh.filter.PageResponseWrapper.getPage(PageResponseWrapper.java:169)
	at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:123)
	at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:260)
	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
	at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2396)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
	at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
	at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:405)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:380)
	at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:508)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:533)
	at java.lang.Thread.run(Thread.java:536)

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