一般用于表单提交时候，用post来提交，用get就会出现这个异常

Error 500--Internal Server Error

java.lang.NegativeArraySizeException
	at com.jspsmart.upload.SmartUpload.upload(SmartUpload.java:218)
	at jsp_servlet._qqda._main._tj._daoexl.__daoexl._jspService(__daoexl.java:209)
	at weblogic.servlet.jsp.JspBase.service(JspBase.java:34)
	at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
	at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
	at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)
	at weblogic.servlet.internal.ServletStubImpl.onAddToMapException(ServletStubImpl.java:416)
	at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:326)
	at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:183)
	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3717)
	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3681)
	at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
	at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
	at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2277)
	at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2183)
	at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1454)
	at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
	at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)