Java awt Desktop 無法調用系統瀏覽器

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用Spring boot搭建項目時，希望在項目啟動完後能自動談出首頁。

就用了java.awt.Desktop類

        if (Desktop.isDesktopSupported()) {            try {                // 彈出瀏覽器 - 顯示HTTP介面(https)                Desktop.getDesktop().browse(new URI("81383628"));            } catch (Exception e) {                LOGGER.info(e.getMessage());            }        }

結果在測試類別裡可以正常訪問，在啟動項目後卻無法彈出網頁。

public static synchronized Desktop getDesktop(){        if (GraphicsEnvironment.isHeadless()) throw new HeadlessException();        if (!Desktop.isDesktopSupported()) {            throw new UnsupportedOperationException("Desktop API is not " +                                                    "supported on the current platform");        }        sun.awt.AppContext context = sun.awt.AppContext.getAppContext();        Desktop desktop = (Desktop)context.get(Desktop.class);        if (desktop == null) {            desktop = new Desktop();            context.put(Desktop.class, desktop);        }        return desktop;    }

private static boolean getHeadlessProperty() {        if (headless == null) {            AccessController.doPrivileged((PrivilegedAction<Void>) () -> {                String nm = System.getProperty("java.awt.headless");                if (nm == null) {                    /* No need to ask for DISPLAY when run in a browser */                    if (System.getProperty("javaplugin.version") != null) {                        headless = defaultHeadless = Boolean.FALSE;                    } else {                        String osName = System.getProperty("os.name");                        if (osName.contains("OS X") && "sun.awt.HToolkit".equals(                                System.getProperty("awt.toolkit")))                        {                            headless = defaultHeadless = Boolean.TRUE;                        } else {                            final String display = System.getenv("DISPLAY");                            headless = defaultHeadless =                                ("Linux".equals(osName) ||                                 "SunOS".equals(osName) ||                                 "FreeBSD".equals(osName) ||                                 "NetBSD".equals(osName) ||                                 "OpenBSD".equals(osName) ||                                 "AIX".equals(osName)) &&                                 (display == null || display.trim().isEmpty());                        }                    }                } else {                    headless = Boolean.valueOf(nm);                }                return null;            });        }        return headless;    }

往下排查原因，發現 getHeadlessProperty 方法中 System.getProperty("java.awt.headless") 處擷取系統參數時返回了true。

導致直接拋出了HeadlessException異常。Headless模式是在缺少顯示屏、鍵盤或者滑鼠時的系統配置，這是此處的參數導致了無法彈出指定視窗。

System.setProperty("java.awt.headless", "false");

所以需要提前設定參數為false。

Java awt Desktop 無法調用系統瀏覽器