该项目模板是selenium chrome java 模板的改进版本，由于 chromedriver 和 headless-chromium 压缩后体积已经非常接近 50MB，留给用户 Jar 的空间非常少，所以该版本使用压缩比更高的 brotli 算法进行压缩，压缩后的大小为 32.7MB。然后在运行时使用 initializer 进行解压，解压耗时大约为 3.7 S。
本项目是在 MacOS 下开发的，涉及到的工具是平台无关的，对于 Linux 和 Windows 桌面系统应该也同样适用。在开始本例之前请确保如下工具已经正确的安装，更新到最新版本，并进行正确的配置。
Fun 和 Fcli 工具依赖于 docker 来模拟本地环境。
对于 MacOS 用户可以使用 homebrew 进行安装：
brew cask install docker brew tap vangie/formula brew install fun brew install fcliWindows 和 Linux 用户安装请参考：
- https://github.com/aliyun/fun/blob/master/docs/usage/installation.md
- https://github.com/aliyun/fcli/releases
安装好后，记得先执行 fun config 初始化一下配置。
注意, 如果你已经安装过了 fun，确保 fun 的版本在 2.10.2 以上。
$ fun --version 2.10.1使用 fun init 命令可以快捷地将本模板项目初始化到本地。
fun init vangie/packed-selenium-java-example$ fun install ...测试代码 ChromeDemo 的内容为：
public class ChromeDemo implements StreamRequestHandler, FunctionInitializer { public void initialize(Context context) throws IOException { Instant start = Instant.now(); try (TarArchiveInputStream in = new TarArchiveInputStream( new BrotliCompressorInputStream( new BufferedInputStream( new FileInputStream("chromedriver.tar.br"))))) { TarArchiveEntry entry; while ((entry = in.getNextTarEntry()) != null) { if (entry.isDirectory()) { continue; } File file = new File("/tmp/bin", entry.getName()); File parent = file.getParentFile(); if (!parent.exists()) { parent.mkdirs(); } System.out.println("extract file to " + file.getAbsolutePath()); try (FileOutputStream out = new FileOutputStream(file)) { IOUtils.copy(in, out); } Files.setPosixFilePermissions(file.getCanonicalFile().toPath(), getPosixFilePermission(entry.getMode())); } } Instant finish = Instant.now(); long timeElapsed = Duration.between(start, finish).toMillis(); System.out.println("Extract binary elapsed: " + timeElapsed + "ms"); } public void handleRequest(InputStream inputStream, OutputStream outputStream, Context context) throws IOException { System.setProperty("webdriver.chrome.driver", "/tmp/bin/chromedriver"); ChromeOptions options = new ChromeOptions(); options.setBinary("/tmp/bin/headless-chromium"); options.addArguments("--disable-extensions"); // disabling extensions options.addArguments("--disable-gpu"); // applicable to windows os only options.addArguments("--disable-dev-shm-usage"); // overcome limited resource problems options.addArguments("--no-sandbox"); // Bypass OS security model options.addArguments("--headless"); WebDriver driver = new ChromeDriver(options); driver.get("https://ide.fc.aliyun.com"); outputStream.write(("Page title is: " + driver.getTitle() + "\n").getBytes()); driver.quit(); } private Set<PosixFilePermission> getPosixFilePermission(int permissions) { Set<PosixFilePermission> filePermissions = new HashSet<>(); // using bitwise operations check the file permissions in decimal // numeric system // e.g. 100100 AND 100, we will have for result 100 if ((permissions & 256) > 0) { filePermissions.add(PosixFilePermission.OWNER_READ); } if ((permissions & 128) > 0) { filePermissions.add(PosixFilePermission.OWNER_WRITE); } if ((permissions & 64) > 0) { filePermissions.add(PosixFilePermission.OWNER_EXECUTE); } if ((permissions & 32) > 0) { filePermissions.add(PosixFilePermission.GROUP_READ); } if ((permissions & 16) > 0) { filePermissions.add(PosixFilePermission.GROUP_WRITE); } if ((permissions & 8) > 0) { filePermissions.add(PosixFilePermission.GROUP_EXECUTE); } if ((permissions & 4) > 0) { filePermissions.add(PosixFilePermission.OTHERS_READ); } if ((permissions & 2) > 0) { filePermissions.add(PosixFilePermission.OTHERS_WRITE); } if ((permissions & 1) > 0) { filePermissions.add(PosixFilePermission.OTHERS_EXECUTE); } return filePermissions; }$ mvn package && fun local invoke selenium ... FC Invoke Start RequestId: 68c83b4c-b053-479c-9b0e-9503582ccb56 handle user request is com.aliyun.fc.selenium.ChromeDemo::handleRequest cache is null! Starting ChromeDriver 2.35.528139 (47ead77cb35ad2a9a83248b292151462a66cd881) on port 20652 Only local connections are allowed. Mar 05, 2019 11:34:27 AM org.openqa.selenium.remote.ProtocolHandshake createSession INFO: Detected dialect: OSS Page title is: 云端集成开发环境 FC Invoke End RequestId: 68c83b4c-b053-479c-9b0e-9503582ccb56 RequestId: 68c83b4c-b053-479c-9b0e-9503582ccb56 Billed Duration: 5265 ms Memory Size: 1998 MB Max Memory Used: 240 MB $ mvn package && fun deploy$ fcli function invoke -s chrome -f selenium Page title is: 云端集成开发环境