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Log4jInit.java：源码内容

							package com.chinacannel.common;
import javax.servlet.http.HttpServlet;
import org.apache.log4j.*;
import javax.servlet.*;
import java.util.Properties;
import java.io.FileInputStream;
import java.io.IOException;
public class Log4jInit extends HttpServlet {
    static Logger logger = Logger.getLogger(Log4jInit.class);
    public Log4jInit() {}
    public void init(ServletConfig config) throws ServletException {
        String prefix = config.getServletContext().getRealPath("/");
        String file = config.getInitParameter("log4j");
        String filePath = prefix + file;
        Properties props = new Properties();
        try {
            FileInputStream istream = new FileInputStream(filePath);
            props.load(istream);
            istream.close();
            //toPrint(props.getProperty("log4j.appender.file.File"));
            String logFile = prefix +
                             props.getProperty("log4j.appender.file.File"); //设置路径
            props.setProperty("log4j.appender.file.File", logFile);
            PropertyConfigurator.configure(props); //装入log4j配置信息
        } catch (IOException e) {
            toPrint("Could not read configuration file [" + filePath + "].");
            toPrint("Ignoring configuration file [" + filePath + "].");
            return;
        }
    }
    public static void toPrint(String content) {
        System.out.println(content);
    }
}

						