Question

我必须在我的日志记录系统中添加自定义方法方法。让我们说我在几个地方的代码行如下： private static Logger LOGGER = LoggerFactory.getLogger(MyJavaClass.class);

记录由slf4j处理。如何通过添加public void error(SomeTypeObject obj) { /implementation/ }

之类的新（！）方法来扩展我的记录器

目标是不更改现有代码。如何强制LoggerFactory返回我自己的Logger实现，并使用上述方法进行扩展？

我按照这个问题的答案：stackoverflow.com/questions/2653855/implement-custom-logger-with-slf4j

所以，我已经制作了我的LoggerFactory，StaticLoggerBinder和MyLoggerAdapter。

StaticLoggerBinder

public class StaticLoggerBinder implements LoggerFactoryBinder {

    private static final StaticLoggerBinder SINGLETON = new StaticLoggerBinder();

    public static final StaticLoggerBinder getSingleton() {
        return SINGLETON;
    }

    public static String REQUESTED_API_VERSION = "1.6.99";

    private static final String loggerFactoryClassStr = MyLoggerFactory.class.getName();

    private final ILoggerFactory loggerFactory;

    private StaticLoggerBinder() {
        loggerFactory = new MyLoggerFactory();
    }

    public ILoggerFactory getLoggerFactory() {
        return loggerFactory;
    }

    public String getLoggerFactoryClassStr() {
        return loggerFactoryClassStr;
    }
}

记录器工厂

public class MyLoggerFactory implements ILoggerFactory {

    ConcurrentMap<String, Logger> loggerMap;

    public MyLoggerFactory() {
        loggerMap = new ConcurrentHashMap<String, Logger>();
    }

    public Logger getLogger(String name) {
        Logger simpleLogger = loggerMap.get(name);
        if (simpleLogger != null) {
            return simpleLogger;
        } else {
            Logger newInstance = new MyLoggerAdapter(name);
            Logger oldInstance = loggerMap.putIfAbsent(name, newInstance);
            return oldInstance == null ? newInstance : oldInstance;
        }
    }

    void reset() {
        loggerMap.clear();
    }
}

MyLogger

public class MyLoggerAdapter implements Logger {
//methods from Logger interface
//and my additional method

    public void error(Exception ex) {
        //do smthng;
    }
}

现在，在MyJavaClass中我有一个字段 private static Logger LOGGER = LoggerFactory.getLogger(MyJavaClass.class);

问题是，当我尝试LOGGER.error(myExceptionObject)时，该方法不可见。我错过了什么。我非常感谢你的帮助。

Answer 1

在您的MyJavaClass中，您应该使用MyLoggerFactory：

private static MyLoggerAdapter LOGGER = MyLoggerFactory.getLogger();

代替

private static Logger LOGGER = LoggerFactory.getLogger(MyJavaClass.class);

Answer 2

在此示例中，记录器可以做到：

private static MyLoggerAdapter log = (MyLoggerAdapter) StaticLoggerBinder.getSingleton().getLoggerFactory.getLogger(MyController.class.getName());

slf4j添加自定义方法

2 个答案: