当文件存在所有权限时FileNotFoundException [英] FileNotFoundException when file exists with all permissions

问题描述

我正在尝试读取一个文件，并且我得到的错误是

I am trying to read a file and the error i get is

java.io.FileNotFoundException: /homes/at1106/fourthYearComputing/Individual-Project/svn-workspace/trunk/Individual_Project/src/game/player/gametheoryagent/configurations/gameTheoryAgentConfiguration.properties  (No such file or directory)
        at java.io.FileInputStream.open(Native Method)
        at java.io.FileInputStream.<init>(FileInputStream.java:106)
        at game.player.gametheoryagent.GameTheoryAgent.<init>(GameTheoryAgent.java:67)
        at simulation.Simulator.createPlayer(Simulator.java:141)
        at simulation.Simulator.main(Simulator.java:64)

但是文件确实存在，只是为了加倍检查我给出了777的权限，如下所示：

however the file does exist and just to double check i gave it 777 permissions, as shown below:

tui% cd /homes/at1106/fourthYearComputing/Individual-Project/svn-workspace/trunk/Individual_Project/src/game/player/gametheoryagent/configurations
tui% ls -al
total 4
drwxrwxrwx 3 at1106 cs4 1024 2010-02-22 17:45 .
drwxrwxrwx 4 at1106 cs4 1024 2010-02-22 17:27 ..
-rwxrwxrwx 1 at1106 cs4  260 2010-02-22 17:31 gameTheoryAgentConfiguration.properties
drwxrwxrwx 6 at1106 cs4 1024 2010-02-22 17:41 .svn

任何想法，为什么我得到FNF异常？

Any ideas as to why I'm getting the FNF exception?

感谢

拨打电话的java代码：

java code that makes the call:

File file = new File(pathToConfiguration)
   Properties configuration = new Properties();
    try{
        configuration.load(new FileInputStream(file));
        int RAISE_RATIO = Integer.parseInt(configuration.getProperty("raise_ratio"));
    }
    catch(IOException event){
        System.err.println("Error in reading configuration file " + pathToConfiguration);
        event.printStackTrace();    
  }

属性文件为：

raise_ratio=4

（使用diff pathToConfiguration（传递给构造函数））并且正常工作。

This was tested in windows (with a diff pathToConfiguration (which is passed into the constructor)) and works fine.

在Catch块中的以下检查中添加

Added in the following checks in the Catch block

        if(file.exists()){
            System.out.println("file exists");
        }
        else{
            System.out.println("file doesn't exist");
        }

        System.out.println(file.getAbsolutePath());
        if(file.canRead()){
            System.out.println("can read");
        }
        if(file.canWrite()){
            System.out.println("can write");
        }

输出如下：

file doesn't exist
/homes/at1106/fourthYearComputing/Individual-Project/svn-workspace/trunk/Individual_Project/src/game/player/gametheoryagent/configurations/gameTheoryAgentConfiguration.properties

推荐答案

根据初始堆栈跟踪似乎是文件名和原因之间的两个空格：

According to the initial stacktrace there appear to be two spaces between the file name and reason:

FileNotFoundException: ...Configuration.properties  (No such file or directory)
--------------------------------------------------^^

这将告诉我文件名可能有一个尾随空格。您可以通过以下方式仔细检查您的pathToConfiguration变量：

This would indicate to me that the filename possibly has a trailing space. Can you double check your pathToConfiguration variable by:

System.out.println("[" + pathToConfiguration + "]");

重复检查路径是否符合您的想法？

To double check that the path is what you think it is?

这篇关于当文件存在所有权限时FileNotFoundException的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！