SpringBoot log4j日志没生成

从同事那接了一个脚手架，启动后发现日志文件没生成。都知道SpringBoot默认带的logback,若是要用log4j须要把logback的依赖去掉。看了下工程的pom.xml文件，确实是有加去掉spring-boot-starter-logging的声明。html

<exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-logging</artifactId>
                </exclusion>
            </exclusions>

那怎么就死活不生成日志呢。倒腾了好几回，无心中看到控制台最上面的输出:java

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/D:/Users/xxx/.m2/repository/ch/qos/logback/logback-classic/1.1.11/logback-classic-1.1.11.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/D:/Users/xxx/.m2/repository/org/slf4j/slf4j-log4j12/1.7.25/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [ch.qos.logback.classic.util.ContextSelectorStaticBinder]

说的是SLF4J依赖冲突，而后最后用例logback的。摔，难怪log4j日志一直没生成。谷歌了一下，找到了解决办法。修改pom.xml，加入如下代码把logback的依赖去掉。spring

<dependency>
		    <groupId>org.springframework.boot</groupId>
		    <artifactId>spring-boot-starter</artifactId>
		    <exclusions>
		        <exclusion>
		            <artifactId>logback-classic</artifactId>
		            <groupId>ch.qos.logback</groupId>
		        </exclusion>
		        <exclusion>
		            <artifactId>log4j-over-slf4j</artifactId>
		            <groupId>org.slf4j</groupId>
		        </exclusion>
		    </exclusions>
		</dependency>

参考连接：spring-boot

https://stackoverflow.com/questions/33071002/spring-boot-multiple-slf4j-bindings/33962453
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