java 转码后插入数据库的时候报错

//从页面获取数据
public void addFee(HttpServletRequest req,HttpServletResponse res)throws ServletException, IOException{
req.setCharacterEncoding("utf-8");
String gdbh=req.getParameter("gdbh");
String cqsj=req.getParameter("cqsj");
String jssj=req.getParameter("jssj");............
//sql插入数据（用Interactive SQL）
String sql="insert into sunrise.xm_pxmd (sjh,gw,xm,zw,skxs,jssp......
ps.setString(1,CharUtil.dataSet(t.getSjh()));
ps.setString(2,CharUtil.dataSet(t.getGw()));
ps.setString(3,CharUtil.dataSet(t.getXm()))..............//转码的类：
public class CharUtil {
public static String charSet(String str){
if(str==null){
return "";
}
try {
return new String (str.getBytes("cp1252"),"gbk");
} catch (UnsupportedEncodingException e) {

//e.printStackTrace();
throw new RuntimeException("转码异常");
}

}

public static String dataSet(String str){
if(str==null){
return "";
}
try {
return new String (str.getBytes("gbk"),"cp1252");
} catch (UnsupportedEncodingException e) {

//e.printStackTrace();
throw new RuntimeException("转码异常");
}

}只要数页面存的数据是中文，就无法插入数据 （控制台输出中文就是？？？？？，请问大神怎么解决）Training [sjh=1234567890, xm=哈哈, gw=1, zw=1, skxs=1.2, jssp=0, jsrz=2, jsnx=1, yjnr=1, rjnr=2, cpaqx=3, cpyyx=4, yyxsm=哈哈学校, cpgn=0, gnsm=好好学习]
1111111
45454
1234567890
1
com.sybase.jdbc.SybSQLException: ASA Error -193: primary key for table 'xm_pxmd' is not unique
????
1
1.2
0
2
1
1
2
3
0
???????
0
??????
121112
at com.sybase.tds.Tds.processEed(Tds.java)
at com.sybase.tds.Tds.nextResult(Tds.java)
at com.sybase.jdbc.ResultGetter.nextResult(ResultGetter.java)
at com.sybase.jdbc.SybStatement.nextResult(SybStatement.java)
at com.sybase.jdbc.SybStatement.updateLoop(SybStatement.java)
at com.sybase.jdbc.SybStatement.executeUpdate(SybStatement.java)
at com.sybase.jdbc.SybPreparedStatement.executeUpdate(SybPreparedStatement.java)
at cn.sunrise.dao.TrainingDao.addPxmd(TrainingDao.java:53)
at cn.sunrise.web.RegisTerServlet.addpxmd(RegisTerServlet.java:305)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at cn.sunrise.web.MainServlet.doPost(MainServlet.java:36)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:506)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:962)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1115)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2549)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2538)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:744)
1