JFinal 源码导读第一天(JFinalFilter init)

  1.读源码当然从入口开始读 web.xml,非常简单一个filter

<filter>
<filter-name>jfinal</filter-name>
<filter-class>com.jfinal.core.JFinalFilter</filter-class>
<init-param>
<param-name>configClass</param-name>
<param-value>com.demo.common.DemoConfig</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>jfinal</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

  2.JFinalFilter的init初始化

	public void init(FilterConfig filterConfig) throws ServletException {
		createJFinalConfig(filterConfig.getInitParameter("configClass"));
		
		if (jfinal.init(jfinalConfig, filterConfig.getServletContext()) == false)
			throw new RuntimeException("JFinal init error!");
		
		handler = jfinal.getHandler();
		constants = Config.getConstants();
		encoding = constants.getEncoding();
		jfinalConfig.afterJFinalStart();
		
		String contextPath = filterConfig.getServletContext().getContextPath();
		contextPathLength = (contextPath == null || "/".equals(contextPath) ? 0 : contextPath.length());
	}

   3.createJFinalConfig,就是实例化上面的param-value中的值

	private void createJFinalConfig(String configClass) {
		if (configClass == null)
			throw new RuntimeException("Please set configClass parameter of JFinalFilter in web.xml");
		
		try {
			Object temp = Class.forName(configClass).newInstance();
			if (temp instanceof JFinalConfig)
				jfinalConfig = (JFinalConfig)temp;
			else
				throw new RuntimeException("Can not create instance of class: " + configClass + ". Please check the config in web.xml");
		} catch (InstantiationException e) {
			throw new RuntimeException("Can not create instance of class: " + configClass, e);
		} catch (IllegalAccessException e) {
			throw new RuntimeException("Can not create instance of class: " + configClass, e);
		} catch (ClassNotFoundException e) {
			throw new RuntimeException("Class not found: " + configClass + ". Please config it in web.xml", e);
		}
	}

  4.jfinal.init才是代码初始化的关键

	boolean init(JFinalConfig jfinalConfig, ServletContext servletContext) {
		this.servletContext = servletContext;
		this.contextPath = servletContext.getContextPath();
		
		initPathUtil();
		
		Config.configJFinal(jfinalConfig);	// start plugin and init logger factory in this method
		constants = Config.getConstants();
		
		initActionMapping();
		initHandler();
		initRender();
		initActiveRecord();
		initOreillyCos();
		initI18n();
		initTokenManager();
		
		return true;
	}

 5.initPathUtil()代码很简单,自己调试进去就知道,没什么好说

	private void initPathUtil() {
		String path = servletContext.getRealPath("/");
		PathKit.setWebRootPath(path);
	}

	public static void setWebRootPath(String webRootPath) {
		if (webRootPath == null)
			return ;
		
		if (webRootPath.endsWith(File.separator))
			webRootPath = webRootPath.substring(0, webRootPath.length() - 1);
		PathKit.webRootPath = webRootPath;
	}

6.Config.configJFinal(jfinalConfig);

	jfinalConfig.configConstant(constants);				initLoggerFactory();
		jfinalConfig.configRoute(routes);
		jfinalConfig.configPlugin(plugins);					startPlugins();	// very important!!!
		jfinalConfig.configInterceptor(interceptors);
		jfinalConfig.configHandler(handlers);

7.我这里就看一个方法initLoggerFactory

	private static void initLoggerFactory() {
		Logger.init();
		log = Logger.getLogger(Config.class);
		JFinalFilter.initLogger();
	}