java.io.FileNotFoundException :(系統找不到指定的路徑）jar結果

您好我在Java中有這個jar問題。我設置的路徑無法識別。我在jar裏面查了一下，發現路徑是正確的，我已經刪除並在Java文件和路徑的開頭添加了「/」，但仍然不起作用。還有什麼我可以嘗試嗎？java.io.FileNotFoundException :(系統找不到指定的路徑）jar結果

CODE

package sample; 


public class LocateMyCity { 

    private String myCityLocation; 

    private String country; 

    public String getCountry() { 
     return country; 
    } 

public String getmyCityLocation(){ 
    return myCityLocation; 
} 

public LocateMyCity() { 
    // A File object pointing to your GeoIP2 or GeoLite2 database 
    File database = new File("\\GeoLite2-City_20170502\\GeoLite2-City.mmdb"); 

    try { 
     URL whatismyip = new URL("http://checkip.amazonaws.com"); 
     BufferedReader in = new BufferedReader(new InputStreamReader(
       whatismyip.openStream())); 

     String ip = in.readLine(); //you get the IP as a String 
     System.out.println(ip); 

     // This creates the DatabaseReader object, which should be reused across 
     // lookups. 
     DatabaseReader reader = new DatabaseReader.Builder(database).build(); 

     InetAddress ipAddress = InetAddress.getByName(ip); 

     // Replace "city" with the appropriate method for your database, e.g., 
     // "country". 
     CityResponse response = reader.city(ipAddress); 

     City city = response.getCity(); 
     System.out.println(city.getName()); // 'Minneapolis' 
     this.myCityLocation = city.getName(); 

     Country country = response.getCountry(); 
     System.out.println(country.getIsoCode());   // 'GB' 
     this.country = country.getIsoCode(); 

     System.out.println(country.getName());    // 'United Kindom' 

    }catch (Exception e){ 
     e.printStackTrace(); 
     System.out.println("Tracing IP E"); 
    } 
}

}從命令提示

Inside jar file

錯誤消息

java.io.FileNotFoundException: \GeoLite2-City_20170502\GeoLite2-City.mmdb (The system cannot find the path specified) 
    at java.io.RandomAccessFile.open0(Native Method) 
    at java.io.RandomAccessFile.open(Unknown Source) 
    at java.io.RandomAccessFile.<init>(Unknown Source) 
    at com.maxmind.db.BufferHolder.<init>(BufferHolder.java:19) 
    at com.maxmind.db.Reader.<init>(Reader.java:116) 
    at com.maxmind.geoip2.DatabaseReader.<init>(DatabaseReader.java:35) 
    at com.maxmind.geoip2.DatabaseReader.<init>(DatabaseReader.java:23) 
    at com.maxmind.geoip2.DatabaseReader$Builder.build(DatabaseReader.java:129) 
    at sample.LocateMyCity.<init>(LocateMyCity.java:44) 
    at sample.WeatherToday.getPersonLocationId(WeatherToday.java:102) 
    at sample.WeatherToday.<init>(WeatherToday.java:126) 
    at sample.Main.start(Main.java:37) 
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$162(LauncherImpl.java:863) 
    at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$175(PlatformImpl.java:326) 
    at com.sun.javafx.application.PlatformImpl.lambda$null$173(PlatformImpl.java:295) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294) 
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95) 
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) 
    at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191) 
    at java.lang.Thread.run(Unknown Source)

來源

2017-06-19 Ben Wells

您使用絕對路徑而不是相對路徑。使用'LocateMyCity.class.getResourceAsStream（「/ GeoLite2-City_20170502/GeoLite2-City.mmdb」）''。此外，我建議使用斜槓而不是反斜槓，因爲操作系統無關性 – Jens

您必須使用'ClassLoader.getResourceAsStream（「GeoLite2-City_201705 02/GeoLite2-City.mmd b」）'爲jar條目而不是創建一個'File' 。 –

好吧，它應該是InputStream數據庫= LocateMyCity.class.getResourceAsStream（「\\ GeoLite2-City_20170502 \\ GeoLite2-City.mmdb」）; ？ –

-1

替換

File database = new File("\\GeoLite2-City_20170502\\GeoLite2-City.mmdb");

與

File file = new File(classLoader.getResource("\\GeoLite2-City_20170502\\GeoLite2-City.mmdb").getFile());

來源

2017-06-19 13:40:22 Amit

無法解析它所說的符號classLoader。 –

您指定的路徑是相對的，也許出發點是不是你有你要找的文件。嘗試這樣的事情

ClassLoader classLoader = getClass().getClassLoader(); 
File file = new File(classLoader.getResource("GeoLite2-City_20170502/GeoLite2-City.mmdb").getFile());

並把該目錄在你的JAR的起點（如果使用Maven在src /資源/）

來源

2017-06-19 13:46:21

我把代碼放進去，這次是javanotfoundexception，我看到一個「！」在文件路徑中由於某些原因導致jar「\ MirrorMe.jar！\ GeoLite2-City_20170502 \ GeoLite2-City.mmdb（文件名，目錄名稱或卷標語法不正確）」 –

java.io.FileNotFoundException :(系統找不到指定的路徑）jar結果

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