SpringBoot中的日志关系

  	
            org.springframework.boot
            spring-boot-starter
  	

SpringBoot使用以下依赖做日志记录：

  	
            org.springframework.boot
            spring-boot-starter-logging
  	

总结：
1.SpringBoot底层也是使用slf4j+logback的方式进行日志记录
2.SpringBoot也把其他日志都替换成slf4j
3.中间替换包

package org.apache.logging.slf4j;

import java.net.URI;
import org.apache.logging.log4j.spi.LoggerContext;
import org.apache.logging.log4j.spi.LoggerContextFactory;
import org.apache.logging.log4j.status.StatusLogger;
import org.apache.logging.log4j.util.LoaderUtil;

public class SLF4JLoggerContextFactory implements LoggerContextFactory {
    private static final StatusLogger LOGGER = StatusLogger.getLogger();
    private static LoggerContext context = new SLF4JLoggerContext();

    public SLF4JLoggerContextFactory() {
        boolean misconfigured = false;

        try {
            LoaderUtil.loadClass("org.slf4j.helpers.Log4jLoggerFactory");
            misconfigured = true;
        } catch (ClassNotFoundException var3) {
            LOGGER.debug("org.slf4j.helpers.Log4jLoggerFactory is not on classpath. Good!");
        }

        if (misconfigured) {
            throw new IllegalStateException("slf4j-impl jar is mutually exclusive with log4j-to-slf4j jar (the first routes calls from SLF4J to Log4j, the second from Log4j to SLF4J)");
        }
    }

    public LoggerContext getContext(final String fqcn, final ClassLoader loader, final Object externalContext, final boolean currentContext) {
        return context;
    }

    public LoggerContext getContext(final String fqcn, final ClassLoader loader, final Object externalContext, final boolean currentContext, final URI configLocation, final String name) {
        return context;
    }

    public void removeContext(final LoggerContext ignored) {
    }
}

4.如果引入其他框架，一定要把这个框架的默认日志依赖移除掉
Spring框架用的是commons-logging

		
            org.springframework
            spring-core
            
                
                    commons-logging
                    commons-logging
                
            
        

SpringBoot能自动适配所有的日志，而且底层使用slf4j+logback的方式记录日志，引入其他框架的时候，只需要把这个框架依赖的日志框架排除掉