给Java项目中的文件提供固定路径（Netbeans）

Question

I have a Java project generating jasper reports, what I do is I give path of a file (report) and run my project it runs fine, but when I have to give JAR file to my friend, it always need that file to be placed in that specific folder according to which my code get's the file path and then have to place file there, my code is below to give some idea

public void generateReport(String dateStart, String dateEnd) {
    InputStream stream = null;
    Connection connection = null;
    Class.forName("com.mysql.jdbc.Driver");
    connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/app", "root", "");
    stream = new FileInputStream(new File("").getAbsolutePath() + "/reports/logReport.jrxml");
    JasperDesign jasperDesign = JRXmlLoader.load(stream);
    jasperReport = JasperCompileManager.compileReport(jasperDesign);
    JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, null, connection);

    //frame.getContentPane().add(dateSetter, BorderLayout.PAGE_START);
    frame.getContentPane().add(new JRViewer300(jasperPrint), BorderLayout.CENTER);
    frame.setResizable(false);
    frame.setSize(900, 600);
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
    isVisible = true;
    connection.close();
    stream.close();
    }

within code it get the file from the path as given

/reports/logReport.jrxml

but when I put JAR file somewhere else and run it, it gives error that

C:\\Desktop\\reports\\logReport.jrxml cannot find path specified.

I know it's due to code part new File("").getAbsolutePath() but I need to know how to make it so that it always get the file path from within project! So that I don't always have to place that particular file there!

Answer 1

If you want to make it an absolute path to the same directory always you just specify the entire path.

stream = new FileInputStream(new File("C:/path/to/my/reports/logReport.jrxml"));

If you want it relative to the directory where your jar is running.

stream = new FileInputStream(new File("path/to/my/reports/logReport.jrxml"));

If instead you are looking to load the file from your Jar itself, you need to do it differently.

stream = this.getClass().getResourceAsStream.("/path/to/my/reports/logReport.jrxml");

Answer 2

Better you read the file form a specified location

Here is the link to read the file from a specified location.

but if the same code is running on a server you have to specify the path relative to the root directory where the server is running

 String location = "/opt/reports/";
 String filename = "logReport.jrxml";

 File file = new File(location + filename);