读取资源文件夹中的文件时出现 FileNotFoundException

Question

Code:

  String filePath = "src//main//resources//QR_CODE//QR_Code.png";
            //String filePath = "C:\\Work\\QR_CODE\\QR_Code.png";
            String charset = "UTF-8"; // or "ISO-8859-1"
            Map <EncodeHintType, ErrorCorrectionLevel> hintMap = new HashMap < EncodeHintType, ErrorCorrectionLevel > ();
            hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
            BitMatrix matrix = new MultiFormatWriter().encode(
                    new String(qrCodeData.getBytes(charset), charset),
                    BarcodeFormat.QR_CODE, 200, 200, hintMap);
            MatrixToImageWriter.writeToFile(matrix, filePath.substring(filePath
                    .lastIndexOf('.') + 1), new File(filePath));

Output:

12:33:09,948 ERROR [stderr] (default task-17) java.io.FileNotFoundException: src\main\resources\QR_CODE\QR_Code.png (The system cannot find the path specified)
12:33:09,948 ERROR [stderr] (default task-17)   at java.io.RandomAccessFile.open0(Native Method)
12:33:09,950 ERROR [stderr] (default task-17)   at java.io.RandomAccessFile.open(RandomAccessFile.java:316)
12:33:09,950 ERROR [stderr] (default task-17)   at java.io.RandomAccessFile(RandomAccessFile.java:243)
12:33:

Answer 1

if you want to use dynamic addressing in linux based system:

String filePath = System.getProperty("user.dir")+"/path/to/file/QR_Code.png";

in windows based system:

String filePath = System.getProperty("user.dir")+"\\path\\to\\file\\QR_Code.png";

System.getProperty("user.dir") is your project address.

if you want to use static addressing in linux based system:

String filePath = "/home/username/eclipse-workspace/test/path/to/file/QR_Code.png";

in windows based system:

String filePath = "C:\\Work\\QR_CODE\\QR_Code.png";