一打開頁面就出現(xiàn)異常，代碼是按照視頻一點(diǎn)一點(diǎn)敲的

SmartUploadServlet.java:17指向doGet()方法調(diào)用doPost(req, resp);

SmartUploadServlet.java:44指向su.upload();

java.lang.NegativeArraySizeException
?? ?at com.jspsmart.upload.SmartUpload.upload(SmartUpload.java:108)
?? ?at com.zw.servlet.SmartUploadServlet.doPost(SmartUploadServlet.java:44)
?? ?at com.zw.servlet.SmartUploadServlet.doGet(SmartUploadServlet.java:17)
?? ?at javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
?? ?at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
?? ?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:220)
?? ?at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
?? ?at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504)
?? ?at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
?? ?at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
?? ?at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
?? ?at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
?? ?at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421)
?? ?at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1074)
?? ?at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
?? ?at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314)
?? ?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)