安装日志
日志使用：
下载slf4j.jar
// Install Java Utils Logging Bridge
SLF4JBridgeHandler.install();

// Removes Java Utils Loggers
LogManager logManager = LogManager.getLogManager();
java.util.logging.Logger root = logManager.getLogger("");
Handler[] handlers = root.getHandlers();
for (int i = 0; i < handlers.length; i++) {
Handler handler = handlers[i];
if (handler instanceof ConsoleHandler) {
root.removeHandler(handler);
}
}


// Java Utils的日志会经过此级别和SLF4J日志级别的双重过滤
root.setLevel(java.util.logging.Level.INFO);
LoggerContext context = (LoggerContext) LoggerFactory.getILoggerFactory();

// 限制com.test信息为INFO级别
Logger logger = context.getLogger("com.test");
logger.setLevel(Level.WARN);