Java记录器控制台流重复输出 [英] Java Logger Console Stream Duplicate Output
问题描述
一旦我添加了ConsoleHandler,每一个日志信息不会打印出来三次,两次我想要的正确的格式,然后一次与我不想要的原始格式。
我的代码如下,不知道我在做什么错。
任何帮助将不胜感激。
//删除和处理程序将被替换
Handler [] handlers = logger.getHandlers();
for(Handler handler:handlers)
{
if(handler.getClass()== ConsoleHandler.class || handler.getClass()== FileHandler.class)
logger .removeHandler(处理程序);
//文件处理程序
FileHandler fh = new FileHandler(file.toString());
fh.setFormatter(new MS2Formatter());
logger.addHandler(fh);
//控制台处理程序
ConsoleHandler ch = new ConsoleHandler();
ch.setFormatter(new MS2Formatter());
logger.addHandler(ch);
logger.setLevel(Level.INFO);
编辑:回答
$ b $
logger = Logger.getLogger(Logger.getLogger 我的记录器);
logger.setUseParentHandlers(false);
//将被替换的移除和处理程序
Handler [] handlers = logger.getHandlers();
for(Handler handler:handlers)
{
if(handler.getClass()== ConsoleHandler.class)
logger.removeHandler(handler);
//设置文件
文件file = new File(location +/+ fileName);
//文件处理程序
FileHandler fh = new FileHandler(file.toString(),true);
fh.setFormatter(new MS2Formatter());
logger.addHandler(fh);
//控制台处理程序
ConsoleHandler ch = new ConsoleHandler();
ch.setFormatter(new MS2Formatter());
logger.addHandler(ch);
//将被替换的移除和处理程序
logger.setLevel(Level.INFO);
确实需要多少个处理程序? addHandler()
将您创建的处理程序添加到与该记录程序关联的处理程序中。所以你有默认的处理程序,你已经在代码中添加了2个文件:FileHandler和ConsoleHandler。
你可以使用 getHandlers()
方法并使用 removeHandler()
来移除您不需要的处理程序。
编辑
在你的情况中,父处理器可能被使用。所以,即使你认为你正在移除处理程序,如果你实际上调试了代码,你会发现在执行过程中,你永远不会真正删除一个处理程序(或者至少不是ConsoleHandler)。 >
为了防止父处理程序被使用,使用这个语句。
logger。 setUseParentHandlers(假);
I hope this question has a simple answer. I am trying to add a logger to my Java application. I was able to format the log file perfectly, but I ran into an issue when trying to add a ConsoleHandler to the logger to format the console output.
Once I added the ConsoleHandler, every log message is not printed out three times, twice with the proper formatting I want, and then once with the original format that I do not want.
Ill post my code below, not sure at all what I am doing wrong.
Any help will be greatly appreciated.
// remove and handlers that will be replaced
Handler[] handlers = logger.getHandlers();
for(Handler handler : handlers)
{
if(handler.getClass() == ConsoleHandler.class || handler.getClass() == FileHandler.class)
logger.removeHandler(handler);
}
// file handler
FileHandler fh = new FileHandler(file.toString());
fh.setFormatter(new MS2Formatter());
logger.addHandler(fh);
// console handler
ConsoleHandler ch = new ConsoleHandler();
ch.setFormatter(new MS2Formatter());
logger.addHandler(ch);
logger.setLevel(Level.INFO);
EDIT: Answer
Just wanted to post my final code here to help anyone with a similar problem.
logger = Logger.getLogger("My Logger");
logger.setUseParentHandlers(false);
// remove and handlers that will be replaced
Handler[] handlers = logger.getHandlers();
for(Handler handler : handlers)
{
if(handler.getClass() == ConsoleHandler.class)
logger.removeHandler(handler);
}
// setup the file
File file = new File(location + "/" + fileName);
// file handler
FileHandler fh = new FileHandler(file.toString(), true);
fh.setFormatter(new MS2Formatter());
logger.addHandler(fh);
// console handler
ConsoleHandler ch = new ConsoleHandler();
ch.setFormatter(new MS2Formatter());
logger.addHandler(ch);
// remove and handlers that will be replaced
logger.setLevel(Level.INFO);
Exactly how many handlers do you need? addHandler()
adds the handler you've created to the handlers associated with that logger. So you have the default handler, and the 2 you've added in your code - FileHandler and ConsoleHandler.
You can get the current set of handlers using the getHandlers()
method and use removeHandler()
to remove the handlers you don't need.
EDIT
In your case, chances are that the parent handlers are being used. So even though you think you are removing the handlers, if you actually debug the code, you'll see that during execution the in the for loop you never really remove a handler at all (or at least not a ConsoleHandler).
To prevent parent handlers from being used, use this statement.
logger.setUseParentHandlers(false);
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