SLF4J: Class path contains multiple SLF4J bindings.

错误信息:

SLF4J Warning: Class Path Contains Multiple SLF4J Bindings

错误原因:
我个人博客系统一个爬虫组件用到webmagic，而webmagic与lomback中的slf有冲突。

解决办法(webmagic排除相关依赖即可):

<!-- webmagic-->
      <dependency>
          <groupId>us.codecraft</groupId>
          <artifactId>webmagic-core</artifactId>
          <version>${webmagic.version}</version>
          <exclusions>
              <exclusion>
                  <groupId>org.slf4j</groupId>
                  <artifactId>slf4j-log4j12</artifactId>
              </exclusion>
              <exclusion>
                  <groupId>log4j</groupId>
                  <artifactId>log4j</artifactId>
              </exclusion>
          </exclusions>
      </dependency>

参考解决问题地址:
SLF4J Warning: Class Path Contains Multiple SLF4J Bindings