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Q:How can I disable the default console handler, while using the java logging API?

Q:我怎么可以禁用默认的控制台程序,用java日志API吗?

Hi I am trying to implement the java logging in my application. I want to use two handlers. A file handler and my own console handler. Both of my handlers work fine. My logging is send to a file and to the console . My logging is also sent to the default console handler, which i do not want. If you run my code you will see extra two line sent to the console. I don't want to use the default console handler. Does anyone know how to disable the default console handler. I only want to use the two handlers I have created.

Handler fh = new FileHandler("test.txt");
fh.setFormatter(formatter);
logger.addHandler(fh);

Handler ch = new ConsoleHandler();
ch.setFormatter(formatter);
logger.addHandler(ch);

import java.util.Date;
import java.util.logging.ConsoleHandler;
import java.util.logging.FileHandler;
import java.util.logging.Formatter;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.LogManager;
import java.util.logging.LogRecord;
import java.util.logging.Logger;

public class LoggingExample {
    private static Logger logger = Logger.getLogger("test");

    static {
        try {
            logger.setLevel(Level.INFO);

            Formatter formatter = new Formatter() {

                @Override
                public String format(LogRecord arg0) {
                    StringBuilder b = new StringBuilder();
                    b.append(new Date());
                    b.append(" ");
                    b.append(arg0.getSourceClassName());
                    b.append(" ");
                    b.append(arg0.getSourceMethodName());
                    b.append(" ");
                    b.append(arg0.getLevel());
                    b.append(" ");
                    b.append(arg0.getMessage());
                    b.append(System.getProperty("line.separator"));
                    return b.toString();
                }

            };

            Handler fh = new FileHandler("test.txt");
            fh.setFormatter(formatter);
            logger.addHandler(fh);

            Handler ch = new ConsoleHandler();
            ch.setFormatter(formatter);
            logger.addHandler(ch);

            LogManager lm = LogManager.getLogManager();
            lm.addLogger(logger);
        } catch (Throwable e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        logger.info("why does my test application use the standard console logger ?\n" + " I want only my console handler (Handler ch)\n " + "how can i turn the standard logger to the console off. ??");
    }
}

Hi I am trying to implement the java logging in my application. I want to use two handlers. A file handler and my own console handler. Both of my handlers work fine. My logging is send to a file and to the console . My logging is also sent to the default console handler, which i do not want. If you run my code you will see extra two line sent to the console. I don't want to use the default console handler. Does anyone know how to disable the default console handler. I only want to use the two handlers I have created.

Handler fh = new FileHandler("test.txt");
fh.setFormatter(formatter);
logger.addHandler(fh);

Handler ch = new ConsoleHandler();
ch.setFormatter(formatter);
logger.addHandler(ch);

import java.util.Date;
import java.util.logging.ConsoleHandler;
import java.util.logging.FileHandler;
import java.util.logging.Formatter;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.LogManager;
import java.util.logging.LogRecord;
import java.util.logging.Logger;

public class LoggingExample {
    private static Logger logger = Logger.getLogger("test");

    static {
        try {
            logger.setLevel(Level.INFO);

            Formatter formatter = new Formatter() {

                @Override
                public String format(LogRecord arg0) {
                    StringBuilder b = new StringBuilder();
                    b.append(new Date());
                    b.append(" ");
                    b.append(arg0.getSourceClassName());
                    b.append(" ");
                    b.append(arg0.getSourceMethodName());
                    b.append(" ");
                    b.append(arg0.getLevel());
                    b.append(" ");
                    b.append(arg0.getMessage());
                    b.append(System.getProperty("line.separator"));
                    return b.toString();
                }

            };

            Handler fh = new FileHandler("test.txt");
            fh.setFormatter(formatter);
            logger.addHandler(fh);

            Handler ch = new ConsoleHandler();
            ch.setFormatter(formatter);
            logger.addHandler(ch);

            LogManager lm = LogManager.getLogManager();
            lm.addLogger(logger);
        } catch (Throwable e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        logger.info("why does my test application use the standard console logger ?\n" + " I want only my console handler (Handler ch)\n " + "how can i turn the standard logger to the console off. ??");
    }
}
answer1: 回答1:

The default console handler is attached to the root logger, which is a parent of all other loggers including yours. So I see two ways to solve your problem:

If this is only affects this particular class of yours, the simplest solution would be to disable passing the logs up to the parent logger:

logger.setUseParentHandlers(false);

If you want to change this behaviour for your whole app, you could remove the default console handler from the root logger altogether before adding your own handlers:

Logger globalLogger = Logger.getLogger("global");
Handler[] handlers = globalLogger.getHandlers();
for(Handler handler : handlers) {
    globalLogger.removeHandler(handler);
}

Note: if you want to use the same log handlers in other classes too, the best way is to move the log configuration into a config file in the long run.

控制台的默认处理程序附加到根记录器,它是所有其他记录器包括你的父母。所以我看到两种方法来解决你的问题:

如果这仅仅是影响这类特殊的你,最简单的解决办法是禁用通过日志到父记录器:

logger.setUseParentHandlers(false);

如果你想改变这种行为对你的整个应用程序,你可以从根记录器之前完全加入自己的处理程序删除默认的控制台程序:

Logger globalLogger = Logger.getLogger("global");
Handler[] handlers = globalLogger.getHandlers();
for(Handler handler : handlers) {
    globalLogger.removeHandler(handler);
}

注意:如果您想在其他类中使用相同的日志处理程序,最好的方法是将日志配置从长期运行到配置文件中。

answer2: 回答2:

Just do

LogManager.getLogManager().reset();

刚做的

LogManager.getLogManager().reset();
answer3: 回答3:

This is strange but Logger.getLogger("global") does not work in my setup (as well as Logger.getLogger(Logger.GLOBAL_LOGGER_NAME)).

However Logger.getLogger("") does the job well.

Hope this info also helps somebody...

这很奇怪,但记录器。getlogger(全球)不在我的设置工作(以及记录。getlogger(记录器。global_logger_name))。

然而记录器。getlogger(“”)工作做的好。

希望这个信息也帮助某人…

answer4: 回答4:

Do a reset of the configuration and set the root level to OFF

LogManager.getLogManager().reset();
Logger globalLogger = Logger.getLogger(java.util.logging.Logger.GLOBAL_LOGGER_NAME);
globalLogger.setLevel(java.util.logging.Level.OFF);

对配置进行重置并将根级别设置为关闭

LogManager.getLogManager().reset();
Logger globalLogger = Logger.getLogger(java.util.logging.Logger.GLOBAL_LOGGER_NAME);
globalLogger.setLevel(java.util.logging.Level.OFF);
answer5: 回答5:

You must instruct your logger not to send it's messages on up to it's parent logger:

...
import java.util.logging.*;
...
Logger logger = Logger.getLogger(this.getClass().getName());
logger.setUseParentHandlers(false);
...

However, this should be done before adding any more handlers to logger.

你必须让你的日志不发送它到它的父记录的消息:

...
import java.util.logging.*;
...
Logger logger = Logger.getLogger(this.getClass().getName());
logger.setUseParentHandlers(false);
...

然而,这之前应该添加更多的处理器来记录了。

java  java.util.logging