如何在这个简单的 Java Logging 实现中附加到日志文件?

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时间:2020-08-14 00:46:36  来源:igfitidea点击:

How can I append to log files in this simple Java Logging implementation?

javaloggingjava.util.logging

提问by diegoaguilar

I got the following class to create and manage a Logger. Whenever across the code and program execution, calls to static getLogger()catch blocksare used to log.

我有以下课程来创建和管理Logger. 每当跨越代码和程序执行时,都会使用对静态getLogger()catch 块的调用来记录日志。

public class Log {
    private static final Logger logger = Logger.getLogger("MyLog");  

    public static void iniciarLog() throws IOException {
        FileHandler fh;  

        try { 
//          fh = new FileHandler(System.getProperty("user.home")+System.getProperty("file.separator")+"TorrentDownloader.log");  
            fh = new FileHandler("%h/TorrentDownloader.log");  
            logger.addHandler(fh);
            SimpleFormatter formatter = new SimpleFormatter();  
            fh.setFormatter(formatter);  

            logger.info("Se inició el log"); 
        } catch (SecurityException | IOException e) {  
            logger.severe("Error al crear el log");
        } 
    }

    public static Logger getLogger() {
        return logger;
    }
}

However, how can I append to such logging file? All examples I've seen change a lot this implementation which I like as it's clear, brief and simple.

但是,如何附加到这样的日志文件?我见过的所有示例都对这个实现进行了很大的改变,我喜欢它,因为它清晰、简短和简单。

采纳答案by calimbak

From the FileHandlerconstructor, you can specify a booleanto specify an append mode.

FileHandler构造函数中,您可以指定 aboolean来指定附加模式。

Do as following:

执行以下操作:

fh = new FileHandler("%h/TorrentDownloader.log", true);  

回答by Evgeniy Dorofeev

Use a different constructor

使用不同的构造函数

fh = new FileHandler("%h/TorrentDownloader.log", true);  

回答by Owen Cao

You can use this constructor:

您可以使用此构造函数:

FileHandler handler = new FileHandler(String pattern, boolean append);

and in your case, it's:

在你的情况下,它是:

fh = new FileHandler("%h/TorrentDownloader.log", true);

This constructor creates a FileHandler with a file name pattern, and a boolean telling whether the FileHandler should append to any existing files or not.

这个构造函数创建一个带有文件名模式的 FileHandler 和一个布尔值,告诉 FileHandler 是否应该附加到任何现有文件。

And this articlehas a full explanation.

这篇文章有一个完整的解释。