Log类

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import org.slf4j.LoggerFactory;public class Logger {    public static void warn(Object obj, String message, Exception e) {        org.slf4j.Logger log = LoggerFactory.getLogger(obj.getClass().getName());        if (log.isWarnEnabled()) {            if (e == null) {                log.warn(message);            } else {                log.warn(message, e);            }        }    }    public static void warn(Object obj, String message) {        warn(obj, message, null);    }    public static void error(Object obj, String message) {        error(obj.getClass(), message, null);    }    public static void error(Class clz, String message) {        error(clz, message, null);    }    public static void error(Object obj, String message, Throwable e) {        org.slf4j.Logger log = LoggerFactory.getLogger(obj.getClass().getName());        if (log.isErrorEnabled()) {            if(e == null){                log.error(message);            }            else{                log.error(message, e);            }        }    }    public static void info(Object obj, String message) {        info(obj.getClass(), message);    }    public static void info(Class clz, String message) {        org.slf4j.Logger log = LoggerFactory.getLogger(clz.getName());        if (log.isInfoEnabled()) {            log.info(message);        }    }    public static void infoAndTrace(Object obj, String message) {        infoAndTrace(obj.getClass(), message);    }    public static void infoAndTrace(Class clz, String message) {        info(clz, message);        trace(clz, message);    }    private static void trace(Class clz, String message) {        org.slf4j.Logger log = LoggerFactory.getLogger(clz.getName());        if (log.isTraceEnabled()) {            log.trace(message);        }    }    public static void debug(Object obj, String message) {        debug(obj.getClass(), message);    }    public static void debug(Class clz, String message) {        org.slf4j.Logger log = LoggerFactory.getLogger(clz.getName());        if (log.isDebugEnabled()) {            log.debug(message);        }    }}
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