当通过 Jar 文件执行时启动画面不显示，但当从 Netbeans 执行时它工作 IDE

Question

从 Project properties -> Run Option

设置应用程序启动画面

StartApp绘制的SplashScreen Class

   public class StartApp {

public static void main(String[] args) {
    new Thread(new Runnable() {

        public void run() {
            splashInit();           // initialize splash overlay drawing parameters
            appInit();              // simulate what an application would do before starting
            if (mySplash != null) // check if we really had a spash screen
            {
                mySplash.close();   // we're done with it
            }
        }
    }).start();

    // begin with the interactive portion of the program
    Context.initialize();


}
static SplashScreen mySplash;                   // instantiated by JVM we use it to get graphics
static Graphics2D splashGraphics;               // graphics context for overlay of the splash image
static Rectangle2D.Double splashTextArea;       // area where we draw the text
static Rectangle2D.Double splashProgressArea;   // area where we draw the progress bar
static Font font;                               // used to draw our text

/**
 * just a stub to simulate a long initialization task that updates
 * the text and progress parts of the status in the Splash
 */
private static void appInit() {
    Random random = new Random();
    int progress = 0;
    splashProgress(0);
    while (progress < 100) {
        //Sleep for up to one second.
        splashText("Please wait... Application is starting " + progress + "%");
        try {
            Thread.sleep(random.nextInt(1000));
        } catch (InterruptedException ex) {
            break;
        }
        //Make random progress.
        progress += random.nextInt(20);
        splashProgress(Math.min(progress, 100));
    }
}

/**
 * Prepare the global variables for the other splash functions
 */
private static void splashInit() {
    // the splash screen object is created by the JVM, if it is displaying a splash image

    mySplash = SplashScreen.getSplashScreen();
    // if there are any problems displaying the splash image
    // the call to getSplashScreen will returned null

    if (mySplash != null) {
        // get the size of the image now being displayed
        Dimension ssDim = mySplash.getSize();
        int height = ssDim.height;
        int width = ssDim.width;

        // stake out some area for our status information
        splashTextArea = new Rectangle2D.Double(20, height * 0.91, width * .50, 25.);
        splashProgressArea = new Rectangle2D.Double(1.0, height * .87, width - 2, 3);

        // create the Graphics environment for drawing status info
        splashGraphics = mySplash.createGraphics();
        font = new Font("Dialog", Font.PLAIN, 14);
        splashGraphics.setFont(font);

        // initialize the status info
        splashText("Starting");
        splashProgress(0);
    }
}

/**
 * Display text in status area of Splash.  Note: no validation it will fit.
 * @param str - text to be displayed
 */
public static void splashText(String str) {
    if (mySplash != null && mySplash.isVisible()) {   // important to check here so no other methods need to know if there
        // really is a Splash being displayed

        // erase the last status text
        splashGraphics.setPaint(new Color(248, 249, 250));
        splashGraphics.fill(splashTextArea);

        // draw the text
        splashGraphics.setPaint(Color.BLACK);
        splashGraphics.drawString(str, (int) (splashTextArea.getX() + 10), (int) (splashTextArea.getY() + 15));

        // make sure it's displayed
        mySplash.update();
    }
}

/**
 * Display a (very) basic progress bar
 * @param pct how much of the progress bar to display 0-100
 */
public static void splashProgress(int pct) {
    if (mySplash != null && mySplash.isVisible()) {

        // Note: 3 colors are used here to demonstrate steps
        // erase the old one
        splashGraphics.setPaint(new Color(230, 230, 230));
        splashGraphics.fill(splashProgressArea);

        // draw an outline
        // Calculate the width corresponding to the correct percentage
        int x = (int) splashProgressArea.getMinX();
        int y = (int) splashProgressArea.getMinY();
        int wid = (int) splashProgressArea.getWidth();
        int hgt = (int) splashProgressArea.getHeight();

        int doneWidth = Math.round(pct * wid / 100.f);
        doneWidth = Math.max(0, Math.min(doneWidth, wid - 1));  // limit 0-width

        // fill the done part one pixel smaller than the outline
        splashGraphics.setPaint(new Color(21, 106, 151));
        splashGraphics.fillRect(x, y - 2, doneWidth, hgt + 1);

        // make sure it's displayed
        mySplash.update();
    }
 }
 }

以上代码是绘制启动画面。请说明为什么它在 jar file 中不起作用，而在 Netbeans IDE 中起作用。

Answer 1

命令行参数-splash:表示磁盘上的图像文件，不能引用嵌入资源（你的图像已经变成了）。

你永远不应该使用任何包含 src 的路径引用，一旦程序是 built/packaged/exported.

它就不会存在

我建议改用清单方法，如 How to Create a Splash Screen 中标题为 "How to Use a JAR File to Display Splash Screen"

的部分所述

Netbeans 实际上有能力为您自动执行此操作，包括将图像打包到 Jar 中并为您更新清单文件

当通过 Jar 文件执行时启动画面不显示，但当从 Netbeans 执行时它工作 IDE

Splash screen not display when execute by Jar File but it works when execute from Netbeans IDE

java

netbeans

jar