使用java属性文件时的FileNotFoundException

时间:2013-10-10 19:32:41

标签: java file-io runtime.exec

在进行了大量的研究并在研究之后在我的代码中实现了这个问题但是我最终得到了FileNotFoundException。我在这里做的是我想要避免在我的java代码中进行硬编码所以我要创建一个属性名为Constants.properties的文件,我在我的java代码中调用它。但它说它找不到文件。我的属性文件位于项目的src文件夹中。以下是代码段。有什么建议吗?

属性文件:

executable.run = C:\\server\\lrd.exe
incoming.file = C:\\file\\test.ic
executable.params1 = -z
executable.params2 = -a[+]
log.file = C:\\TESTFile\\test.txt

Java代码:这是具有属性文件详细信息的类文件。

public class PropInfo {
    static private PropInfo _instance =  null;
    public String executable =  null;
    public String filein = null;
    public String params1 = null; 
    public String params2 = null; 
    public String log = null; 

    protected PropInfo(){
        try{
            InputStream file = new FileInputStream(new File("Constants.properties"));
            Properties props = new Properties();
            props.load(file);
            executable = props.getProperty("executable.run");
            filein = props.getProperty("incomin.file");
            params1 = props.getProperty("executable.params1");
            params2 = props.getProperty("executable.params2");
            log = props.getProperty("log.file");
        } 
        catch(Exception e){
            System.out.println("error" + e);
        }    
    }

    static public PropInfo instance(){
        if(_instance == null){
            _instance = new PropInfo();
        }
        return _instance;
    }
}

主类:

try{
    PropInfo propinfo = PropInfo.instance();
    String connString = propinfo.executable + " " + propinfo.params1 + " " + 
            propinfo.filein + " " + propinfo.params2 + " " + " " + propinfo.log ;

    Runtime rt = Runtime.getRuntime();
    // Process pr = rt.exec 
    // (PropInfo.executable+" "+PropInfo.params1+" "+PropInfo.filein+" "
    //+PropInfo.params2+" "+PropInfo.log);
    Process pr = rt.exec(connString);

    BufferedReader input = new BufferedReader(new InputStreamReader (pr.getInputStream()));

    String line=null;
    StringBuffer start= new StringBuffer();
    while((line=input.readLine()) != null) {
        start.append("Started" + line + "\n");
        System.out.println(line);
    }

    // System.out.println("browse");

}
catch (Throwable t)  
{  
    t.printStackTrace();  
}  
finally 
{  
}

给出了这个例外:

errorjava.io.FileNotFoundException: Constants.properties (The system cannot find the  
file specified)
java.io.IOException: Cannot run program "null": CreateProcess error=2, The system  
cannot find the file specified
at java.lang.ProcessBuilder.start(ProcessBuilder.java:1042)
at java.lang.Runtime.exec(Runtime.java:615)
at java.lang.Runtime.exec(Runtime.java:448)
at java.lang.Runtime.exec(Runtime.java:345)
at com.emc.clp.license.StartTest.main(StartTest.java:44)
Caused by: java.io.IOException: CreateProcess error=2, The system cannot find the 
 file     specified
at java.lang.ProcessImpl.create(Native Method)
at java.lang.ProcessImpl.<init>(ProcessImpl.java:288)
at java.lang.ProcessImpl.start(ProcessImpl.java:133)
at java.lang.ProcessBuilder.start(ProcessBuilder.java:1023)
... 4 more

4 个答案:

答案 0 :(得分:13)

是的,不要将属性文件放入src文件夹中。把它放在从你开始jvm的地方(或提供绝对路径)。另外,我真的建议摆脱路径名中的正斜杠。

更新:添加此项以找出放置文件的位置:

System.out.println(new File(".").getAbsolutePath());

答案 1 :(得分:4)

加载Constants.properties的方式应该在您的包装开始的级别下的src包包下面。

例如,

如果你hava src / java / propinfopackage / PropInfo

将其放在java文件夹中并按如下方式调用

    InputStream propertiesInputStream = null;
                Properties properties = new Properties();
                propertiesInputStream = PropInfo.class.getClassLoader().getResourceAsStream("/Constants.properties");
                properties.load(propertiesInputStream);
  String value = properties.getProperty("executable.run");
.......

答案 2 :(得分:1)

我遇到了同样的问题,它就像这样解决了:

Properties prop = new Properties();
try {
    prop.load(getClass().getResourceAsStream("/com/my/package/Constants.properties"));//here your src folder
    System.out.println(prop.getProperty("executable.run"));

} catch(IOException e) {}

答案 3 :(得分:1)

确保您的属性文件位于项目的根路径中。右键单击项目并粘贴属性文件。你的错误会消失。

另请参阅上面的@Axel答案。它将解决您的问题。