運行時報錯：

java.lang.NumberFormatException: For input string: "BB318C07B1B138D5500ECA16365941764"

at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)

at java.lang.Integer.parseInt(Integer.java:447)

at java.lang.Integer.parseInt(Integer.java:497)

at dao.ItemsDAO.getViewList(ItemsDAO.java:151)

at org.apache.jsp.details_jsp._jspService(details_jsp.java:221)

at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)

at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:472)

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:728)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)

at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:444)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)

at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:1025)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445)

at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1137)

at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)

at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:319)

at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)

at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

at java.lang.Thread.run(Thread.java:619)

通過輸出cookie中的內容發現第一次點擊商品時，存入cookie中的值是形如"BB318C07B1B138D5500ECA16365941764"的字符串，所以在執行Integer.parseInt(arr[i])時會拋出異常。

但是多點擊幾個商品，查看cookie中保存的內容又是正確的："BB318C07B1B138D5500ECA16365941764#1#4#2#2#2#1".

導致點擊商品次數超過5次才不會報錯（因為不會將第一個神奇的字符串轉換成數字了）

太奇怪了！為什么第一次點擊商品時存入cookie中的值會是個字符串呢？？？