【发布时间】：2012-05-26 14:34:45
【问题描述】：
考虑以下代码：
m_Writer = new PrintWriter(new FileWriter("LoginHistory.dat"));
m_Writer.println(Integer.toString(s_NumOfLogins));
m_Writer.println(m_LoginHistoryStr);
m_Writer.close();
知道为什么我找不到任何名为 LoginHistory.dat 的文件吗？
谢谢
更新：我刚刚发现行后出现异常：
m_Writer = new PrintWriter(new FileWriter("LoginHistory.dat"));
其详细信息是：
任何想法真正的问题是什么？
Listening for transport dt_shmem at address: tomcat_shared_memory_id
27/05/2012 15:52:17 org.apache.catalina.startup.HostConfig checkResources
INFO: Undeploying context [/SignInAndGetIp]
27/05/2012 15:52:17 org.apache.catalina.startup.HostConfig deployDescriptor
INFO: Deploying configuration descriptor SignInAndGetIp.xml from C:\Users\user\.netbeans\7.1.2\apache-tomcat-7.0.22.0_base\conf\Catalina\localhost
27/05/2012 15:52:17 org.apache.catalina.util.LifecycleBase start
INFO: The start() method was called on component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/SignInAndGetIp]] after start() had already been called. The second call will be ignored.
java.io.FileNotFoundException: LoginHistory.dat (Access denied)
at java.io.FileOutputStream.open(Native Method)
at java.io.FileOutputStream.<init>(FileOutputStream.java:179)
at java.io.FileOutputStream.<init>(FileOutputStream.java:70)
at java.io.FileWriter.<init>(FileWriter.java:46)
at signIn.SignInAndShowIPTableServlet.init(SignInAndShowIPTableServlet.java:60)
at javax.servlet.GenericServlet.init(GenericServlet.java:160)
at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1228)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1147)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:836)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:135)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:964)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:304)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
【问题讨论】：
-
您在哪里寻找您的数据文件？
-
这是一个在 NetBeans 上生成的 java web 应用，所以我检查了所有的项目目录和子目录
-
我适合没有通过一些异常，它已经生成了文件。你可能看错地方了。尝试给出绝对路径。
-
在关闭 m_Writer 之前尝试调用
m_Writer.flush()。 -
除非您指定路径，否则将在 IDE 的工作空间路径下创建文件。检查那个文件夹。
标签： java tomcat tomcat7 filewriter printwriter