spring boot 加载自定义log4j 文件路径

spring boot 使用log4j 打印时，需首先去除自带 Logger ，然后加入log4j 依赖

     <dependencies>
         <!-- https://mvnrepository.com/artifact/junit/junit -->
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
             <scope>test</scope>
         </dependency>

         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>

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

         <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-log4j -->
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-log4j</artifactId>
             <version>1.3.8.RELEASE</version>
         </dependency>

然后加载自定义 log4j 配置文件，比如我们把 log4j 文件放到 resources/config/log4j/log4j.xml 下，

在启动 spring 之前，加载 log4j 文件

     /**
      * 初始化 log4j
      */
     public static void loadLog4j() {
         DOMConfigurator configurator = new DOMConfigurator();

         ClassLoader classLoader = Application.class.getClassLoader();

         URL url = classLoader.getResource(GlobalConstant.FilePath.log4j_file);

         configurator.doConfigure(url, LogManager.getLoggerRepository());

     }

     public static void main(String[] args) throws Exception {
         //加载 log4j文件
         loadLog4j();

         SpringApplication.run(Application.class, args);
     }