报错环境:
JSP向Severlet页面传值,当Serverlet页执行以下语句时,后台日志报错
int softType = Integer.parseInt(request.getParameter("softType"));
2014-3-27 14:36:57 org.apache.catalina.core.StandardWrapperValve invoke 严重: Servlet.service() for servlet [softClServlet] in context with path [/dms] threw exception java.lang.NumberFormatException: null at java.lang.Integer.parseInt(Integer.java:417) at java.lang.Integer.parseInt(Integer.java:499) at com.trs.dms.controller.softClServlet.doPost(softClServlet.java:83) at javax.servlet.http.HttpServlet.service(HttpServlet.java:647) at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) at java.lang.Thread.run(Thread.java:662)
问题分析:
该语句把一个NULL的值转化为INT类型了,即request.getParameter("softType")值为空,在转化前判断是否为NULL 若为NULL 跳过转化给个message
javaweb报错:java.lang.NumberFormatException: null,布布扣,bubuko.com