用Spring boot搭建项目时,希望在项目启动完后能自动谈出首页。
就用了java.awt.Desktop类
if (Desktop.isDesktopSupported()) { try { // 弹出浏览器 - 显示HTTP接口(https) Desktop.getDesktop().browse(new URI("https://blog.csdn.net/weixin_42156742/article/details/81383628")); } catch (Exception e) { LOGGER.info(e.getMessage()); } }
结果在测试类里可以正常访问,在启动项目后却无法弹出网页。
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,发现 getHeadlessProperty 方法中 System.getProperty("java.awt.headless") 处获取系统参数时返回了true。
导致直接抛出了HeadlessException异常。Headless模式是在缺少显示屏、键盘或者鼠标时的系统配置,这是此处的参数导致了无法弹出指定窗口。
System.setProperty("java.awt.headless", "false");
所以需要提前设置参数为false。
原创文章,作者:ItWorker,如若转载,请注明出处:https://blog.ytso.com/194560.html