Question

Java问题exception java.lang.NumberFormatException: For input string: ""

type Exception report

message For input string: ""

description The server encountered an internal error that prevented
it from fulfilling this request.

exception java.lang.NumberFormatException: For input string: ""
java.lang.NumberFormatException.forInputString(Unknown Source)
java.lang.Integer.parseInt(Unknown Source)
java.lang.Integer.parseInt(Unknown Source)
serv.PE.ServPEUptPlayer.doPost(ServPEUptPlayer.java:54)
javax.servlet.http.HttpServlet.service(HttpServlet.java:646)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

note The full stack trace of the root cause is available in the
Apache Tomcat/7.0.53 logs.
serv.PE.ServPEUptPlayer.doPost(ServPEUptPlayer.java:54)代码：

54行 ？？player.setBirthday(new Date(Integer.parseInt(request.getParameter("byear"))-1900,Integer.parseInt(request.getParameter("bmonth"))-1,Integer.parseInt(request.getParameter("bday"))));
player.setBreakDeal(request.getParameter("breakDeal"));player.setCity(request.getParameter("city").trim());
player.setCountry(request.getParameter("country").trim());player.setEmail(request.getParameter("email").trim());

Answer 1

看错误提示 不能把空字符串 转换 成数字类型
猜测 你想把某个字符串 转成 数字 但你这个字符串没有取到应有的值 现在为 “” 他转成数字是 报错的

Answer 2

我赞同2楼的，是要转换类型的字符串为“”，没办法转为number

Answer 3

代码贴出来才知道