java.io.FileNotFoundException-找不到文件

Question

I am trying to write a function that would copy code from a source file to destination file.

copyCode("D:/rraina_IN-L0124_173"+fileName.substring(1), oldTempFile);

This is my function call.

String oldTempFile = "D:/rraina_IN-L0124_173/temp/Old_" + fileName;

this is oldTempFile that is the destination.

This is the function.

private static void copyCode(String src, String destination) throws IOException {
        FileChannel src1 = new FileInputStream(new File(src)).getChannel();
        FileChannel dest1 = new FileOutputStream(new File(destination)).getChannel();
        dest1.transferFrom(src1, 0, src1.size());
        src1.close();
        dest1.close();
    }

However when I run it I get the error :

Failed for file:/gatherer/gather/main/scripts/HartfordRetirement.javajava.io.FileNotFoundException: D:\\rraina_IN-L0124_173\\temp\\Old_HartfordRetirement.java (The system cannot find the path specified)

Answer 1

Check for present of the file as,

File file = new File(destination);
boolean isFileExists = file.exists();
System.out.println(isFileExists);  // this should return true if the file is present

check for the file with name Old_HartfordRetirement.java is present in directory D:\\rraina_IN-L0124_173\\temp\\ check for spell of file name

Answer 2

You should check existance of folders that you want to work with them and source file. use this code:

private static void copyCode(String src, String destination) throws IOException {
    File srcFile = new File(src);

    if (srcFile.exist()) {
        File destFile = new File(destination);
        File destFileParent = destFile.getParentFile();
        if (!destFileParent.exist()) destFileParent.mkdirs();

        FileChannel src1 = new FileInputStream(srcFile).getChannel();
        FileChannel dest1 = new FileOutputStream(destFile)).getChannel();
        dest1.transferFrom(src1, 0, src1.size());
        src1.close();
        dest1.close();
    }
}

Answer 3

In your method invocation, the source argument is missing one file seperator.

copyCode("D:/rraina_IN-L0124_173/"+fileName.substring(1), oldTempFile);

Also I would suggest to check that the value of fileName.substring(1) is returning the correct file name.