java - java中没有这样的文件异常

Question

我的程序遇到一些问题，它给了我 java.nio.file.NoSuchFileException 我正在尝试将文件夹和文件复制到另一个，但其他人也正常工作。我正在尝试从 Arraylist 复制文件夹和文件，arraylist 中的值来自 DEL_COPY_DIR (属性文件)。这是我的代码如下。

   ArrayList<String> list1 = readConfigFileList(ConstantVariables.DEL_COPY_DIR);
                            for (String strList1 : list1)
                            {
                                if(strList1.contains("<mnbr>")){
                                    String[] saDirectory = strList1.split("<mnbr>");
                                    String strDirectory = saDirectory[0];
                                    String strMnbrContent = saDirectory[1];
                                    File file = new File(strSource + strDirectory);
                                    String[] saMnbrFile = file.list();
                                    for(int i = 0; i < saMnbrFile.length; i++) {

                                        File fileList = new File(strSource + strDirectory + saMnbrFile[i] + strMnbrContent);
                                        String strsrcList = new String(fileList.toString());
                                        File fileList1 = new File(strDestination + strDirectory + saMnbrFile[i] + strMnbrContent);
                                        String strdestList = new String(fileList1.toString());
                                        if(fileList.isDirectory())
//                                          System.out.println(strSource + strDirectory + saMnbrFile[i] + strMnbrContent);

                                            copyFolders(strsrcList, strdestList);
                                    }
                                }
                                else {
                                    copyFolders(strSource + strList1 , strDestination + strList1);
                                }
                            }

复制文件

public void copyFiles(String source, String destination) throws IOException{

    try {
        File fileFrom = new File(source);
        File fileTo = new File(destination);
        Files.copy( fileFrom.toPath(), fileTo.toPath(), StandardCopyOption.REPLACE_EXISTING);

    } catch (IOException e) {
        e.printStackTrace();
        System.out.println("Error");

    }
}

复制文件夹

public void copyFolders(String src, String dest)
        throws IOException{
    File srcFrom = new File(src);
    File destTo = new File(dest);
    if(srcFrom.isDirectory()){
        if (!destTo.exists())
        {
            destTo.mkdir();
            txtDetails.append("Directory copied : " + dest + "\n");
        }
        final String files[] = srcFrom.list();
        for (String file : files)
        {
            File srcFile = new File(src, file);
            File destFile = new File(dest, file);

            //Recursive function call
            copyFolders(srcFile.toString(), destFile.toString());
        }

    }
    else{
        copyFiles(src, dest);
        txtDetails.append("Files Copying: " + srcFrom.getAbsolutePath() + "...Done" + "\n");

    }
}

完全错误

java.nio.file.NoSuchFileException: D:\dest\data\25\misc\AlarmCum.obj -> D:\destination\data\25\misc\AlarmCum.obj
at sun.nio.fs.WindowsException.translateToIOException(Unknown Source)
at sun.nio.fs.WindowsException.rethrowAsIOException(Unknown Source)
at sun.nio.fs.WindowsFileCopy.copy(Unknown Source)
at sun.nio.fs.WindowsFileSystemProvider.copy(Unknown Source)
at java.nio.file.Files.copy(Unknown Source)
at org.eclipse.wb.swt.FortryApplication.copyFiles(FortryApplication.java:295)
at org.eclipse.wb.swt.FortryApplication.copyFolders(FortryApplication.java:337)
at org.eclipse.wb.swt.FortryApplication.copyFolders(FortryApplication.java:332)
at org.eclipse.wb.swt.FortryApplication$3.widgetSelected(FortryApplication.java:239)
at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source)
at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source)
at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)
at org.eclipse.wb.swt.FortryApplication.open(FortryApplication.java:51)
at org.eclipse.wb.swt.FortryApplication.main(FortryApplication.java:346)

PS:我使用文本框作为源和目标

Answer 1

此异常意味着尝试访问不存在的文件。在您的情况下，它是D:\dest\data\25\misc\AlarmCum.obj。

我建议检查路径是否有拼写错误并确保它位于文件系统上。

如果您自动创建文件，请确保在访问它之前已创建该文件。使用此检查

    if(yourFile.exists()){
    //your logic here
    }
else {
//your logic here when file doesn't exist
}