我正在从这里学习日志概述:http://docs.oracle.com/javase/6/docs/technotes/guides/logging/overview.html#1.15 , 我有以下问题。我创建了一个简单的 WEB 应用程序,并使用以下代码:
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
Logger logger = Logger.getLogger("com.NewServlet.severe");
Logger logger2 = Logger.getLogger("com.NewServlet.Fine");
Handler fh=new FileHandler("/C:/Html/mylogs.txt");
Handler fh2=new FileHandler("/C:/Html/mylogs2.txt");
//Logger.getLogger("com.NewServlet").addHandler(fh);
//Logger.getLogger("com.NewServlet.Fine").addHandler(fh2);
// Logger.getLogger("com.NewServlet").setLevel(Level.SEVERE);
// Logger.getLogger("com.NewServlet.Fine").setLevel(Level.FINE);
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
String number=request.getParameter("value");
Integer num=Integer.valueOf(number);
int a= num.parseInt(number);
int result=0;
try {
/*
* TODO output your page here. You may use following sample code.
*/
result=20/a;
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet NewServlet</title>");
out.println("</head>");
out.println("<body>");
//logger2.fine("doing stuff");
logger2.addHandler(fh2);
logger2.setLevel(Level.FINE);
logger2.fine("doing ALL OK");
//logger2.log(Level.FINE,"doing OK");
out.println("<h1>Servlet NewServlet at " + result + "</h1>");
out.println("</body>");
out.println("</html>");
}
catch ( Exception e1){
logger.addHandler(fh);
logger.setLevel(Level.SEVERE);
logger.log(Level.SEVERE, "troubles", e1);
e1.printStackTrace();
}
finally {
out.close();
}
}
我的问题是日志消息显示两次(一个在服务器控制台中,一个在日志文件中,我该怎么做才能只看到日志文件而不是控制台中的消息?)另一个问题是对于带有 Lever SEVERE 的记录器,我只在服务器控制台中看到错误消息。创建的 .txt mylogs.txt 是空的。为什么会这样?