如何解决我在 Java 中遇到的异常日志记录问题？

Question

我使用了记录器对象并添加了文件处理程序来在 Java 项目的日志文件中记录异常。它工作正常，当我运行它来自 NetBeans IDE，但是当我运行它作为来自控制台的独立应用程序时，异常记录在控制台中并且甚至没有创建文件在我指定的位置。

private static final Logger LOGGER = Logger.getLogger(BuyerRegistration.class.getName());

    public static void main(String args[]) {
        
        Formatter simpleFormatter = null;
        Handler fileHandler = null;
        try {
            LOGGER.setUseParentHandlers(false);
            fileHandler = new FileHandler("dist/lib/CurryHouse.log", true);
            simpleFormatter = new SimpleFormatter();
            LOGGER.addHandler(fileHandler);
            fileHandler.setFormatter(simpleFormatter);
            fileHandler.setLevel(Level.ALL);
            LOGGER.setLevel(Level.ALL);
        } catch (IOException exception) {
            LOGGER.log(Level.SEVERE, "Error occur in FileHandler.", exception);
        }

以上代码将进入 BuyerRegistration class。此外，我在所有 catch 块中附加了以下代码以在文件中记录异常。

LOGGER.log(Level.SEVERE, "{0}\n", "Bills:352\t" + e.toString());

我想让代码在我指定的位置记录所有异常，而不是在控制台中记录

Answer 1

I run it as a standalone application from console, the exceptions are logged in console and the file is not even created in the location I have specified.

您正在使用 relative path which is altered when the current directory is changed. Use a absolute path, a FileHandler pattern，或者在启动器中设置当前目录。

I want to the code to log all the exceptions in the location I specify rather than logging in the console

将您的处理程序添加到根记录器而不是您命名的记录器。您可以通过提供 logging.properties or a config class.

来做到这一点

private static final Logger ROOT = Logger.getLogger("");
static {
    Formatter simpleFormatter = null;
    Handler fileHandler = null;
    try {
        //TODO: Fix file path
        fileHandler = new FileHandler("%h/CurryHouse.log", true);
        simpleFormatter = new SimpleFormatter();
        LOGGER.addHandler(fileHandler);
        fileHandler.setFormatter(simpleFormatter);
        fileHandler.setLevel(Level.ALL);
        ROOT.addHandler(fileHandler);
    } catch (IOException exception) {
        LOGGER.log(Level.SEVERE, "Error occur in FileHandler.", exception);
    }
}

public static void main(String args[]) {
   //Your app.
}

Also, I have attached the following code in all catch blocks to log the exception in the file.

您可能需要考虑记录完整的堆栈跟踪：

LOGGER.log(Level.SEVERE, "Bills:352", e);

如何解决我在 Java 中遇到的异常日志记录问题？

How to solve the exception logging problem which I have in Java?

java

netbeans

java.util.logging