一般用下面的这几句就可以
request.setCharacterEncoding("utf-8"); response.setCharacterEncoding("utf-8"); response.setContentType("text/html;charset=utf-8");
如果还不行，就用这个
String mbNote = new String(request.getParameter("mbNote").getBytes("latin1"), "utf-8");
推荐博客： http://blog.csdn.net/xiazdong/article/details/7217022/
原文：http://www.cnblogs.com/jwlfpzj/p/6844763.html