将Log4j配置从文件转换为代码内配置

import org.apache.log4j.ConsoleAppender;
import org.apache.log4j.Level;
import org.apache.log4j.PatternLayout;
import org.apache.log4j.Logger;

public class Log4jExample {
    private static final Logger logger = Logger.getLogger(Log4jExample.class);

    public static void main(String[] args) {
        // 创建ConsoleAppender对象
        ConsoleAppender consoleAppender = new ConsoleAppender();
        
        // 设置日志输出格式
        PatternLayout layout = new PatternLayout();
        layout.setConversionPattern("%d [%t] %-5p %c - %m%n");
        consoleAppender.setLayout(layout);
        
        // 设置日志级别
        consoleAppender.setThreshold(Level.DEBUG);
        
        // 将ConsoleAppender添加到Logger对象中
        logger.addAppender(consoleAppender);
        
        // 记录日志
        logger.debug("Debug message");
        logger.info("Info message");
        logger.warn("Warn message");
        logger.error("Error message");
    }
}