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JAR文件的閱讀，「文件：\」的一部分添加時執行`jar`但不能作爲項目

2016-08-16 17 views
0

下面這兩種方法，我想讀內src/com/WindThunderStudio/resources文件在我的應用程序讀取/加載用戶輸入：JAR文件的閱讀，「文件：」的一部分添加時執行`jar`但不能作爲項目

 private void saveInputToFile() { 
      String[][] input = new String[7][4]; 

      //save data to array 

      String uri = Constants.INPUT_DATA_PATH; 
      URL url = getClass().getResource(uri); 
      File f = null; 
      System.out.println("Writing data..."); 
      if (url != null) { 
       System.out.println("Input data path: " + url.getFile()); 
       f = new File(url.getFile()); 
      } else { 
       System.out.println("URL is null. Searching for parent folder. "); 
       String uriNoQuery = uri.substring(0, uri.lastIndexOf("/")); 
       System.out.println("uriNoQuery is: " + uriNoQuery); 
       url = getClass().getResource(uriNoQuery); 
       if (url != null) { 
        f = new File(url.getFile() + File.separator + uri.substring(uri.lastIndexOf("/") + 1, uri.length())); 
        System.out.println("Supposed file absolute path: " + f.getAbsolutePath()); 
        System.out.println("Supposed file path: " + f.getPath()); 
       } else { 
        System.out.println("Cannot construct the URL with " + uriNoQuery); 
       } 
      } 
      try { 
       if (!f.exists()) { 
        if (f.createNewFile()){ 
         System.out.println("Succeeded in creating file. "); 
        } else { 
         System.out.println("Creating file failed. "); 
        } 

       } 
       ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(f)); 
       out.writeObject(input); 
       out.close(); 
      } catch (Exception e) { 
       e.printStackTrace(); 
      } 
     } 

     private void recoverInputFromFile() { 
      try { 
       System.out.println("Reading data..."); 
       String uri = Constants.INPUT_DATA_PATH; 
       URL url = getClass().getResource(uri); 
       if (url != null){ //if the URL is found. If not found, is null. 
        System.out.println("Input data path: " + url.getFile()); 
        File f = new File(url.getFile()); 
        if (f.exists()){ 
         System.out.println("File exists. Path: " + f.getAbsolutePath()); 
         ObjectInputStream in = new ObjectInputStream(new FileInputStream(f)); 
         String[][] input = new String[7][4]; 
         input = (String[][])in.readObject(); 

         //recover data from `input` 

         in.close(); 
        } else { 
         System.out.println("File doesn't exist. " + url.getFile()); 
        } 
       } else { 
        System.out.println("URI is null. " + uri); 
       } 
      } catch (Exception e) { 
       e.printStackTrace(); 
      } 
     }

，其中

Constants.INPUT_DATA_PATH = "/com/WindThunderStudio/resources/inputData.txt";

當應用程序運行時，它會搜索是否有一個URL existante與給定的路徑。如果沒有，什麼都不做。退出時，它檢查是否使用給定的路徑，可以構造URL的對象，如果不是，則更改父文件夾並在該文件夾中創建文件，並將數據寫入該文件。

當作爲在Eclipse Java項目運行，它是所有罰款。第一次：

Reading data... 
URI is null. /com/WindThunderStudio/resources/inputData.txt 
Writing data... 
URL is null. Searching for parent folder. 
uriNoQuery is: /com/WindThunderStudio/resources 
Supposed file absolute path: Y:\CtrlRecau_WinSuite_DYL\desarrollo\workspace_NEW\CalSaldoFichaje\bin\com\WindThunderStudio\resources\inputData.txt 
Supposed file path: Y:\CtrlRecau_WinSuite_DYL\desarrollo\workspace_NEW\CalSaldoFichaje\bin\com\WindThunderStudio\resources\inputData.txt 
Succeeded in creating file.

並保存數據。第二次運行，數據被恢復到表中，我得到了在控制檯這些行：

Reading data... 
Input data path: /Y:/CtrlRecau_WinSuite_DYL/desarrollo/workspace_NEW/CalSaldoFichaje/bin/com/WindThunderStudio/resources/inputData.txt 
File exists. Path: Y:\CtrlRecau_WinSuite_DYL\desarrollo\workspace_NEW\CalSaldoFichaje\bin\com\WindThunderStudio\resources\inputData.txt 
Writing data... 
Input data path: /Y:/CtrlRecau_WinSuite_DYL/desarrollo/workspace_NEW/CalSaldoFichaje/bin/com/WindThunderStudio/resources/inputData.txt

但是，如果我打包爲一個可運行的jar（包裝時，我選擇了Extract library from jar），我得到了這些錯誤：

第一次運行：

d:\desarrollo>java -jar Cal6.jar 
Reading data... 
URI is null. /com/WindThunderStudio/resources/inputData.txt 
Writing data... 
URL is null. Searching for parent folder. 
uriNoQuery is: /com/WindThunderStudio/resources 
Supposed file absolute path: d:\desarrollo\file:\D:\desarrollo\Cal6.jar!\com\WindThunderStudio\resources\inputData.txt 
Supposed file path: file:\D:\desarrollo\Cal6.jar!\com\WindThunderStudio\resources\inputData.txt 
java.io.IOException: El nombre de archivo, el nombre de directorio o la sintaxis de la etiqueta del volumen no son correctos 
     at java.io.WinNTFileSystem.createFileExclusively(Native Method) 
     at java.io.File.createNewFile(File.java:1006) 
     at com.WindThunderStudio.UI.MainFrame$4.saveInputToFile(MainFrame.java:777) 
     at com.WindThunderStudio.UI.MainFrame$4.windowClosed(MainFrame.java:711) 
     at java.awt.Window.processWindowEvent(Window.java:2054) 
     at javax.swing.JFrame.processWindowEvent(JFrame.java:296) 
     at java.awt.Window.processEvent(Window.java:2009) 
     at java.awt.Component.dispatchEventImpl(Component.java:4872) 
     at java.awt.Container.dispatchEventImpl(Container.java:2287) 
     at java.awt.Window.dispatchEventImpl(Window.java:2719) 
     at java.awt.Component.dispatchEvent(Component.java:4698) 
     at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:747) 
     at java.awt.EventQueue.access$300(EventQueue.java:103) 
     at java.awt.EventQueue$3.run(EventQueue.java:706) 
     at java.awt.EventQueue$3.run(EventQueue.java:704) 
     at java.security.AccessController.doPrivileged(Native Method) 
     at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76) 
     at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87) 
     at java.awt.EventQueue$4.run(EventQueue.java:720) 
     at java.awt.EventQueue$4.run(EventQueue.java:718) 
     at java.security.AccessController.doPrivileged(Native Method) 
     at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76) 
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:717) 
     at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242) 
     at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161) 
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150) 
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146) 
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138) 
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)

異常西班牙的原因是指文件名，文件夾名或路徑的語法是錯誤的。

第二次運行是一樣的，因爲以前的運行沒有寫數據。所以沒有任何東西存儲都沒有恢

我注意到file:\部分，當我執行jar文件，我相信這是問題所在。我試圖擺脫恆定路徑中領先的/，但它不好。

如果有人能幫助我，這將是如此漂亮的你。

該項目在GitHub上可以在這裏找到：

https://github.com/WesleyBlancoYuan/SWING.git

，或者

[email protected]：WesleyBlancoYuan/SWING.git

來源

2016-08-16 FaithReaper

回答

0

最後，這些行幫我：

//1. read the path of the .class file/JAR. Working in both cases. 
String path = URLDecoder.decode(getClass().getProtectionDomain().getCodeSource().getLocation().getPath(), "UTF-8"); 

//2. get the parent folder path where the .class file/JAR is located. 
//Note: "path" only contains "/", not File.separator, because it's an URL. 
String appPath = path.substring(0, lastIndexOf("/")); 

//3. Construct a File with the parent folder + separator + file name. 
File f = new File(appPath + File.seperator + "someFileName.txt");

然後，檢查它是否存在等。

來源

2016-08-31 12:38:17 FaithReaper

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