你需要保持jsp页面和Servlet类中的编码一致。
jsp页面：
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
</head>
<body></body>
</html>
Servlet类中：
public void doPost(HttpServletRequest request,HttpServletResponse response) throws IOException,ServletException
{
request.setCharacterEncoding("UTF-8") ;
.....
}
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