Spring Boot 中使用 Classpath 创建 Servlet 容器源码分析 - TomcatServletWebServerFactory

{"title":"在springboot根据classpath创建servlet容器源码","description":"在Spring Boot中，根据classpath创建Servlet容器的源码位于org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory类中。\n\n下面是简化的源码示例：\n\njava\npublic class TomcatServletWebServerFactory implements ConfigurableServletWebServerFactory {\n\n private static final String[] COMMON_PROTOCOLS = new String[] { "org.apache.coyote.http11.Http11NioProtocol" };\n\n private ClassLoader classLoader;\n\n public TomcatServletWebServerFactory() {\n this.classLoader = getClass().getClassLoader();\n }\n\n @Override\n public WebServer getWebServer(ServletContextInitializer... initializers) {\n Tomcat tomcat = new Tomcat();\n File baseDir = createTempDir("tomcat");\n tomcat.setBaseDir(baseDir.getAbsolutePath());\n Connector connector = new Connector(COMMON_PROTOCOLS[0]);\n tomcat.getService().addConnector(connector);\n tomcat.setConnector(connector);\n tomcat.setPort(8080);\n prepareContext(tomcat.getHost(), initializers);\n return getTomcatWebServer(tomcat);\n }\n\n private WebServer getTomcatWebServer(Tomcat tomcat) {\n return new TomcatWebServer(tomcat, this.classLoader);\n }\n\n private void prepareContext(Host host, ServletContextInitializer... initializers) {\n TomcatEmbeddedContext context = new TomcatEmbeddedContext();\n context.setParentClassLoader(this.classLoader);\n context.setUseRelativeRedirects(false);\n host.addChild(context);\n for (ServletContextInitializer initializer : initializers) {\n initializer.onStartup(context);\n }\n }\n\n private File createTempDir(String prefix) {\n try {\n File tempDir = File.createTempFile(prefix + ".", "." + Math.random());\n tempDir.delete();\n tempDir.mkdir();\n tempDir.deleteOnExit();\n return tempDir;\n }\n catch (IOException ex) {\n throw new WebServerException("Unable to create tempDir", ex);\n }\n }\n\n}\n\n\n在这个源码示例中，getWebServer方法创建了一个Tomcat实例，并设置了端口号、连接器、基本目录等配置。然后，通过prepareContext方法准备了Tomcat的上下文，将ServletContextInitializer添加到Tomcat的上下文中。\n\n最后，通过getTomcatWebServer方法将Tomcat实例封装成TomcatWebServer对象并返回。\n\n请注意，这只是简化的示例代码，并没有涵盖所有的细节和配置。完整的源码可以在Spring Boot的源码库中找到。"}