為什么我的頁面仍顯示“商品展示”這四個大字，其他就沒有顯示了
java.sql.SQLException: 關閉的連接
at oracle.jdbc.driver.PhysicalConnection.prepareStatement(PhysicalConnection.java:3492)
at oracle.jdbc.driver.PhysicalConnection.prepareStatement(PhysicalConnection.java:3393)
at dao.ItemsDAO.getAllItems(ItemsDAO.java:26)
at org.apache.jsp.index_jsp._jspService(index_jsp.java:126)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:439)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:958)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:452)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1087)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2517)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2506)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
這是顯示出錯的原因，我把數據庫重啟了幾遍也不行，又以為是jar包問題，重新換了一個也不行，求指教！
2017-11-05
想想你的數據庫有么有密碼，回到DBHelper.java，
private static final String password="123456";//數據庫的密碼，
我安裝mysql有設置密碼，這是我解決辦法
2017-07-26
應該是你連接的數據庫地址、名稱或者密碼錯誤了。
2017-03-06
我解決了 ，你看看數據庫是不是連接錯了，我是連錯了數據庫
2017-03-06
我也是這個錯誤，求解決辦法
2017-01-23
看起來是數據庫有問題，建議先別加獲取商品的代碼，單獨把數據庫調通了再逐步增加功能