jsp的servlet输出输入的时候乱码时加上下面语句
request.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=utf-8");
//告诉服务器，编码格式为utf-8
response.setCharacterEncoding("utf-8");
//告诉浏览器，编码格式也为utf-8
response.setHeader("Content-type","text/html;charset=utf-8");