log4j将日志输出到相对目录

很简单，我喜欢将Log跟着webRoot走，这样随便你项目移到哪，都可以直接运行，不要再运行这运行那。

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思路是写一个初始化log4j的servlet。

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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);          } } 

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refurl:http://sharep.blog.51cto.com/539048/143734

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