log4j与web.xml的配置

package com.wetop.config; import java.io.FileInputStream; import java.io.IOException; import java.util.Properties; import javax.servlet.ServletConfig; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.xml.rpc.ServiceFactory; import org.apache.log4j.PropertyConfigurator; public class Log4jInit extends HttpServlet { private static final long serialVersionUID = 8421025842405267201L; public void init(ServletConfig config) throws ServletException { super.init(config); String prefix = config.getServletContext().getRealPath("/"); String file = config.getInitParameter("log4j"); String filePath = prefix + file; String outputDir = config.getInitParameter("outputDir"); Properties props = new Properties(); try { FileInputStream istream = new FileInputStream(filePath); props.load(istream); istream.close(); String logFile = prefix + outputDir + "\\" + props.getProperty("log4j.appender.dailyFile.File"); props.setProperty("log4j.appender.dailyFile.File", logFile); PropertyConfigurator.configure(props); System.out.println("启动日志成功！"); } catch (IOException e) { System.out.println("启动日志失败！"); } } }