/**
    * Copyright By Grandsoft Company Limited.  
    * 2012-9-24 下午05:24:19
    */
   package gboat2.base.plugin.servlet.listener;
   
   import java.io.FileInputStream;
   import java.io.IOException;
   import java.util.logging.LogManager;
  
  import javax.servlet.ServletContext;
  import javax.servlet.ServletContextEvent;
  
  import org.apache.commons.io.IOUtils;
  import org.apache.commons.lang3.SystemUtils;
  import org.springframework.util.Assert;
  import org.springframework.web.util.Log4jConfigListener;
  
  /**
   * 读取jdk日志配置文件，初始化jdk日志配置，控制使用jdk自带日志的第三方包的日志输出。<br>
   * 使用方式：<pre>
   * 1. 在 web.xml 中配置该监听器：
   *    <code>&lt;listener&gt;
   *        &lt;listener-class&gt;gboat2.base.plugin.servlet.listener.JDKLoggerConfigListener&lt;/listener-class&gt;
   *    &lt;/listener&gt;</code>
   * 2. JUL（Java Util Logging）的日志策略配置文件默认是使用 /WEB-INF/config/logging.properties，可通过在 web.xml 添加如下配置进行修改：
   *    <code>&lt;context-param&gt;
   *        &lt;description&gt;java util logging 日志策略配置文件&lt;/description&gt;
   *        &lt;param-name&gt;jdkLogConfigPathKey&lt;/param-name&gt;
   *        &lt;param-value&gt;/WEB-INF/config/logging.properties&lt;/param-value&gt;
   *    &lt;/context-param&gt;
   * </code></pre>
   * @date 2013-1-4
   * @author zhangxj-a
   * @author <a href="mailto:[email protected]">何明旺</a>
   * @since 1.0
   */
  public class JDKLoggerConfigListener extends Log4jConfigListener {
  	
  	public static final String JDK_LOG_CONFIG_KEY_PARM = "jdkLogConfigPathKey";
  	
  	public void contextInitialized(ServletContextEvent event) {
  		super.contextInitialized(event);
  		setJdkLogConfigPathSystemProperty(event.getServletContext());
  	}
  	
  	private  void setJdkLogConfigPathSystemProperty(ServletContext servletContext) throws IllegalStateException {
  		Assert.notNull(servletContext, "ServletContext must not be null");
  		String root = servletContext.getRealPath("/");
          String param = servletContext.getInitParameter(JDK_LOG_CONFIG_KEY_PARM);
          param = (param == null) ? "/WEB-INF/config/logging.properties" : param;
  		
  		String key = "java.util.logging.config.file";
  		String value = root + param;
  		System.setProperty(key, value);
  		servletContext.log("Set jdk log config path system property: '" + key + "' = [" + value + "]");
  		
  //		Reinitialize the logging properties and reread the logging configuration
  		FileInputStream logStream = null;
  		try {
  			logStream = new FileInputStream(value);
  			LogManager.getLogManager().readConfiguration(logStream);
  		} catch (IOException e) {
  			servletContext.log("Use default jdk property file logging.properties in the direcory of: " + SystemUtils.getJavaHome() + "/lib");
  		} finally {
  		    IOUtils.closeQuietly(logStream);
  		}
  	}
  }