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problem about show chinese in ff and ie

Hi sir:
in ff ,my page is ok , but in ie,it's show error data
and after i modify code
String address = new String((request.getParameter("G")).getBytes("ISO8859-1"), "UTF-8");
ie is ok ,but ff is wrong
when i used dp.enableUTFencoding(false) , there's a exception worked

2009-9-22 15:39:10 org.apache.tomcat.util.http.Parameters processParameters
警告: Parameters: Character decoding failed. Parameter skipped.
java.io.CharConversionException: isHexDigit
    at org.apache.tomcat.util.buf.UDecoder.convert(UDecoder.java:88)
    at org.apache.tomcat.util.buf.UDecoder.convert(UDecoder.java:49)
    at org.apache.tomcat.util.http.Parameters.urlDecode(Parameters.java:412)
    at org.apache.tomcat.util.http.Parameters.processParameters(Parameters.java:394)
    at org.apache.tomcat.util.http.Parameters.processParameters(Parameters.java:346)
    at org.apache.catalina.connector.Request.parseParameters(Request.java:2491)
    at org.apache.catalina.connector.Request.getParameter(Request.java:1040)
    at org.apache.catalina.connector.RequestFacade.getParameter(RequestFacade.java:355)
    at org.apache.jsp.erp.InternalSale.dataset.gridCaseUpdate_jsp._jspService(gridCaseUpdate_jsp.java:58)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
    at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:857)
    at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:565)
    at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1509)
    at java.lang.Thread.run(Thread.java:619)
2009-9-22 15:39:10 org.apache.tomcat.util.http.Parameters processParameters

please help me。。。