JAVA 读取Properties文件内容乱码 解决方法

HttpSession session = request.getSession();
String mobile=request.getParameter("mobile");
DBSMSend DBSMSend=new DBSMSend();
String mobilecode= DBSMSend.getSix(); //---生成六位的短信验证码
// String msgContxt="你的验证码是"+ mobilecode+"。 如非本人操作，请忽略本短信。";

Properties prop=new Properties ();
InputStreamReader instream=new InputStreamReader(this.getClass().getClassLoader().getResourceAsStream("configinfo.properties"),"GBK");
prop.load(instream);
String msgContxt= prop.getProperty("messageContent")+ mobilecode + prop.getProperty("endMessageContent");
String msg=DBSMSend.sendinsert(msgContxt,mobile );