为什么我在RESIN能够运行的JSP页面在TOMCAT下面却出错呢，代码如下

[maohuibo]

<%@page language = "java" contentType = "text/html;charset=GB2312;"%>
<jsp:useBean id = "message" class = "message.message" scope = "page"/>
<%
String sender = request.getParameter("sender").trim();
String receive = request.getParameter("receive").trim();
String type = request.getParameter("type").trim();
String title = request.getParameter("title").trim();
String param = request.getParameter("param").trim();
String msg_id = request.getParameter("msg_id").trim();
String sendInfo = message.sendMessage(sender,receive,type,title,param,msg_id);
out.println(sendInfo);
%>

[maohuibo]

出错提示如下 ：（tomcat）



A Servlet Exception Has Occurred
org.apache.jasper.JasperException: Unsupported encoding: GB2312;
at org.apache.jasper.compiler.ParserController.getReader(Unknown Source)
at org.apache.jasper.compiler.ParserController.parse(Unknown Source)
at org.apache.jasper.compiler.Compiler.compile(Unknown Source)
at org.apache.jasper.servlet.JspServlet.loadJSP(Unknown Source)
at org.apache.jasper.servlet.JspServlet$JspServletWrapper.loadIfNecessary(Unknown Source)
at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(Unknown Source)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(Unknown Source)
at org.apache.jasper.servlet.JspServlet.service(Unknown Source)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Unknown Source)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(Unknown Source)
at org.apache.catalina.core.StandardWrapperValve.invoke(Unknown Source)
at org.apache.catalina.core.StandardPipeline.invokeNext(Unknown Source)
at org.apache.catalina.core.StandardPipeline.invoke(Unknown Source)
at org.apache.catalina.core.ContainerBase.invoke(Unknown Source)
at org.apache.catalina.core.StandardContextValve.invoke(Unknown Source)
at org.apache.catalina.core.StandardPipeline.invokeNext(Unknown Source)
at org.apache.catalina.valves.CertificatesValve.invoke(Unknown Source)
at org.apache.catalina.core.StandardPipeline.invokeNext(Unknown Source)
at org.apache.catalina.core.StandardPipeline.invoke(Unknown Source)
at org.apache.catalina.core.ContainerBase.invoke(Unknown Source)
at org.apache.catalina.core.StandardContext.invoke(Unknown Source)
at org.apache.catalina.core.StandardHostValve.invoke(Unknown Source)
at org.apache.catalina.core.StandardPipeline.invokeNext(Unknown Source)
at org.apache.catalina.valves.AccessLogValve.invoke(Unknown Source)
at org.apache.catalina.core.StandardPipeline.invokeNext(Unknown Source)
at org.apache.catalina.core.StandardPipeline.invoke(Unknown Source)
at org.apache.catalina.core.ContainerBase.invoke(Unknown Source)
at org.apache.catalina.core.StandardEngineValve.invoke(Unknown Source)
at org.apache.catalina.core.StandardPipeline.invokeNext(Unknown Source)
at org.apache.catalina.core.StandardPipeline.invoke(Unknown Source)
at org.apache.catalina.core.ContainerBase.invoke(Unknown Source)
at org.apache.catalina.connector.http.HttpProcessor.process(Unknown Source)
at org.apache.catalina.connector.http.HttpProcessor.run(Unknown Source)
at java.lang.Thread.run(Thread.java:536)