java - Eclipse Java Web 服务无法读取文件

Question

我用 Eclipse 创建了一个 Java 网络服务，昨天运行良好，但现在 Scanner 突然无法找到该文件，即使它位于同一目录中!

我已经尝试找到它的绝对路径并提供确切路径，但它仍然坚持找不到它。但是，如果我只是将它作为 Java 应用程序运行，它会找到它!我在尝试使用 Web 服务读取文件时做错了什么吗？

我的代码是这样的:

try {
    File file = new File("./data.txt");
    Scanner sc = new Scanner(file);
    String[] arr = new String[3];

    while(sc.hasNextLine()) {
        String s = sc.nextLine();
        arr = s.split(",");
    }
}catch (FileNotFoundException e) {
    e.printStackTrace();
}

作为 Web 服务运行时我不断遇到的错误是

   file foundjava.io.FileNotFoundException: ./data.txt (The system cannot fin
d the file specified)
    at java.io.FileInputStream.open(Native Method)
    at java.io.FileInputStream.<init>(Unknown Source)
    at java.util.Scanner.<init>(Unknown Source)
    at PasswordReset.passwordReset(PasswordReset.java:92)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.apache.axis.providers.java.RPCProvider.invokeMethod(RPCProvider.java:397
)
    at org.apache.axis.providers.java.RPCProvider.processMessage(RPCProvider.java:1
86)
    at org.apache.axis.providers.java.JavaProvider.invoke(JavaProvider.java:323)
    at org.apache.axis.strategies.InvocationStrategy.visit(InvocationStrategy.java:
32)
    at org.apache.axis.SimpleChain.doVisiting(SimpleChain.java:118)
    at org.apache.axis.SimpleChain.invoke(SimpleChain.java:83)
    at org.apache.axis.handlers.soap.SOAPService.invoke(SOAPService.java:454)
    at org.apache.axis.server.AxisServer.invoke(AxisServer.java:281)
    at org.apache.axis.transport.http.AxisServlet.doPost(AxisServlet.java:699)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:646)
    at org.apache.axis.transport.http.AxisServletBase.service(AxisServletBase.java:
327)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application
FilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh
ain.java:208)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application
FilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh
ain.java:208)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja
va:220)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja
va:122)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase
.java:501)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171
)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102
)
    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:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Proce
ssor.java:1040)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(Abstrac
tProtocol.java:607)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:
314)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.ja
va:61)
    at java.lang.Thread.run(Unknown Source)

有人知道问题出在哪里吗？

Answer 1

您在错误的路径中搜索文件。或者程序启动时未创建文件。请验证这两个解决方案，前一段时间有同样的问题。