Java Web实现简单的注册功能

weixin_45342741: java.lang.NullPointerException Utils.JDBCUtils.executeUpdate(JDBCUtils.java:56) register.dao.RegisterDao.register(RegisterDao.java:9) register.servlet.RegisterServlet.doGet(RegisterServlet.java:22) register.servlet.RegisterServlet.doPost(RegisterServlet.java:32) javax.servlet.http.HttpServlet.service(HttpServlet.java:528) javax.servlet.http.HttpServlet.service(HttpServlet.java:596) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) 每次都是这个错误 解决不了。

m0_57602172: 你好，报的这个错是为什么 java.lang.NullPointerException utils.JDBCUtils.executeUpdate(JDBCUtils.java:57) dao.RegisterDao.register(RegisterDao.java:10) servlet.RegisterServlet.doGet(RegisterServlet.java:71) servlet.RegisterServlet.doPost(RegisterServlet.java:81) javax.servlet.http.HttpServlet.service(HttpServlet.java:681) javax.servlet.http.HttpServlet.service(HttpServlet.java:764) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

kelaynny: 有demo嘛

之杰的爸: 牛

get or set: 牛