是否有移动和覆盖文件的操作？

Question

我正在寻找一个移动和覆盖文件的操作.我知道Java7中有一个新方法,但我希望能够绕过Java7.我也知道FileUtils和Guava中的方法,但FileUtils不会覆盖,而Guava也不会记录它.

我也知道,我可以编写自己的方法,我开始了,但是在这里和那里看到了一些问题,所以我希望已经完成了一些事情.

你有什么建议吗？

Answer 1

我使用以下方法:

public static void rename(String oldFileName, String newFileName) {
    new File(newFileName).delete();
    File oldFile = new File(oldFileName);
    oldFile.renameTo(new File(newFileName));
}

Answer 2

我已经完成了编写自己的方法,对于每个对可能的解决方案感兴趣的人,我使用了ApacheCommons FileUtils,这也许并不完美,但对我来说效果还不错:

/**
 * Will move the source File to the destination File.
 * The Method will backup the dest File, copy source to
 * dest, and then will delete the source and the backup.
 * 
 * @param source
 *            File to be moved
 * @param dest
 *            File to be overwritten (does not matter if
 *            non existent)
 * @throws IOException
 */
public static void moveAndOverwrite(File source, File dest) throws IOException {
    // Backup the src
    File backup = CSVUtils.getNonExistingTempFile(dest);
    FileUtils.copyFile(dest, backup);
    FileUtils.copyFile(source, dest);
    if (!source.delete()) {
        throw new IOException("Failed to delete " + source.getName());
    }
    if (!backup.delete()) {
        throw new IOException("Failed to delete " + backup.getName());
    }
}

/**
 * Recursive Method to generate a FileName in the same
 * Folder as the {@code inputFile}, that is not existing
 * and ends with {@code _temp}.
 * 
 * @param inputFile
 *            The FileBase to generate a Tempfile
 * @return A non existing File
 */
public static File getNonExistingTempFile(File inputFile) {
    File tempFile = new File(inputFile.getParentFile(), inputFile.getName() + "_temp");
    if (tempFile.exists()) {
        return CSVUtils.getNonExistingTempFile(tempFile);
    } else {
        return tempFile;
    }
}

Answer 3

可以使用预删除目标来实现具有重写方法的纯 Java nio 解决方案，如图所示

public void move(File sourceFile, String targetFileName) {
    Path sourcePath = sourceFile.toPath();
    Path targetPath = Paths.get(targetFileName);
    File file = targetFile.toFile();
    if(file.isFile()){
        Files.delete(targetPath);
    }
    Files.move(sourcePath, targetPath);
}

Answer 4

Apache FileUtils JavaDoc for FileUtils.copyFileToDirectory说,"如果目标文件存在,那么这个方法将覆盖它." 复制后,您可以在删除之前进行验证.

public boolean moveFile(File origfile, File destfile)
{
    boolean fileMoved = false;
    try{
    FileUtils.copyFileToDirectory(origfile,new File(destfile.getParent()),true);
    File newfile = new File(destfile.getParent() + File.separator + origfile.getName());
    if(newfile.exists() && FileUtils.contentEqualsIgnoreCaseEOL(origfile,newfile,"UTF-8"))
    {
        origfile.delete();
        fileMoved = true;
    }
    else
    {
        System.out.println("File fail to move successfully!");
    }
    }catch(Exception e){System.out.println(e);}
    return fileMoved;
}