Java Swing 嵌入微软 WebView2 的运行环境设置

目标

当使用 DJNativeSwing 和 Eclipse swt 开发 Windows 桌面 Java 应用时，因为使用 Javascript 动态载入 html 片段, 导致 CORS 异常.

Access to XMLHttpRequest at ‘file:///…’ from origin ‘null’ has been blocked by CORS policy: Cross origin requests are only supported for protocol schemes: http, data, isolated-app, chrome-extension, chrome-untrusted, https, edge.

这里提供一种对用户透明的解决方案。

主机

系统:

1. Windows 11 专业版 22H2
   
2. Microsoft WebView2 已经安装

开发环境: IntelliJ IDEA 2022.3 (Ultimate Edition)

参考资料

1. DJNativeSwing

2. Eclipse swt

原理

参考文件 DJ-Native-Swing\swt-4.26RC2-win32-win32-x86_64\src\org\eclipse\swt\browser\Edge.java

// System.getProperty() keys
static final String BROWSER_DIR_PROP = "org.eclipse.swt.browser.EdgeDir";
static final String BROWSER_ARGS_PROP = "org.eclipse.swt.browser.EdgeArgs";
static final String DATA_DIR_PROP = "org.eclipse.swt.browser.EdgeDataDir";
static final String LANGUAGE_PROP = "org.eclipse.swt.browser.EdgeLanguage";
static final String VERSIONT_PROP = "org.eclipse.swt.browser.EdgeVersion";

BROWSER_ARGS_PROP 即为 ICoreWebView2EnvironmentOptions 可选参数 ‘value’，更详细的可以参考 Chromium 的启动参数，目前 MS Edge 与其保持一致。

微软的官方说明，注意参数格式

public HRESULT put_AdditionalBrowserArguments(LPCWSTR value)

Please note that calling this API twice will replace the previous value rather than appending to it. If there are multiple switches, there should be a space in between them. The one exception is if multiple features are being enabled/disabled for a single switch, in which case the features should be comma-seperated. Ex. "--disable-features=feature1,feature2 --some-other-switch --do-something"

2022-12-14 疫情正当前，值得纪念