SpringBoot配置logback的步骤

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
  <!-- 文件输出格式 -->
  <property name="PATTERN" value="%-12(%d{yyyy-MM-dd HH:mm:ss.SSS}) |-%-5level [%thread] %c [%L] -| %msg%n" />
  <!-- test文件路径 -->
  <property name="TEST_FILE_PATH" value="d:/test.log" />
  <!-- pro文件路径 -->
  <property name="PRO_FILE_PATH" value="/opt/test/log" />

  <!-- 开发环境 -->
  <springProfile name="dev">
    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
      <encoder>
        <pattern>${PATTERN}</pattern>
      </encoder>
    </appender>
    <logger name="com.light.springboot" level="debug" />
    <root level="info">
      <appender-ref ref="CONSOLE" />
    </root>
  </springProfile>

  <!-- 测试环境 -->
  <springProfile name="test">
    <!-- 每天产生一个文件 -->
    <appender name="TEST-FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
      <!-- 文件路径 -->
      <file>${TEST_FILE_PATH}</file>
      <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
        <!-- 文件名称 -->
        <fileNamePattern>${TEST_FILE_PATH}/info.%d{yyyy-MM-dd}.log</fileNamePattern>
        <!-- 文件最大保存历史数量 -->
        <MaxHistory>100</MaxHistory>
      </rollingPolicy>
      <layout class="ch.qos.logback.classic.PatternLayout">
        <pattern>${PATTERN}</pattern>
      </layout>
    </appender>
    <logger name="com.light.springboot" level="debug" />
    <root level="info">
      <appender-ref ref="TEST-FILE" />
    </root>
  </springProfile>

  <!-- 生产环境 -->
  <springProfile name="prod">
    <appender name="PROD_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
      <file>${PRO_FILE_PATH}</file>
      <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
        <fileNamePattern>${PRO_FILE_PATH}/warn.%d{yyyy-MM-dd}.log</fileNamePattern>
        <MaxHistory>100</MaxHistory>
      </rollingPolicy>
      <layout class="ch.qos.logback.classic.PatternLayout">
        <pattern>${PATTERN}</pattern>
      </layout>
    </appender>
    <root level="warn">
      <appender-ref ref="PROD_FILE" />
    </root>
  </springProfile>
</configuration>

@Configuration         # 作用于类上，相当于一个 xml 配置文件
@Bean             # 作用于方法上，相当于 xml 配置中的 <bean>
@SpringBootApplication     # Spring Boot的核心注解，是一个组合注解，用于启动类上
@EnableAutoConfiguration    # 启用自动配置，允许加载第三方 Jar 包的配置
@ComponentScan         # 默认扫描 @SpringBootApplication 所在类的同级目录以及它的子目录
@PropertySource        # 加载 properties 文件
@Value             # 将配置文件的属性注入到 Bean 中特定的成员变量
@EnableConfigurationProperties # 开启一个特性，让配置文件的属性可以注入到 Bean 中，与 @ConfigurationProperties 结合使用
@ConfigurationProperties    # 关联配置文件中的属性到 Bean 中
@Import            # 加载指定 Class 文件，其生命周期被 Spring 管理
@ImportResource        # 加载 xml 文件

ds.userName=root
ds.password=tiger
ds.url=jdbc:mysql://localhost:3306/test
ds.driverClassName=com.mysql.jdbc.Driver

以上是自定义的配置。
创建一个配置类，如下：
@Configuration
public class WebConfig {

  @Value("${ds.userName}")
  private String userName;

  @Autowired
  private Environment environment;

  public void show() {
    System.out.println("ds.userName:" + this.userName);
    System.out.println("ds.password:" + this.environment.getProperty("ds.password"));
  }
}

通过 @Value 获取 config.userName 配置；通过 environment 获取 config.password 配置。

测试：
@SpringBootApplication
public class SpringbootApplication {

  public static void main(String[] args) {
    ConfigurableApplicationContext context = SpringApplication.run(SpringbootApplication.class, args);
    context.getBean(WebConfig.class).show();
  }
}

打印结果：
userName:root
password:tiger

@Component
@ConfigurationProperties(prefix="ds")
public class DataSourceProperties {

  private String url;

  private String driverClassName;

  private String userName;

  private String password;


  public void show() {
    System.out.println("ds.url=" + this.url);
    System.out.println("ds.driverClassName=" + this.driverClassName);
    System.out.println("ds.userName=" + this.userName);
    System.out.println("ds.password=" +this.password);
  }

}
测试：
@SpringBootApplication
public class SpringbootApplication {

  public static void main(String[] args) {
    ConfigurableApplicationContext context = SpringApplication.run(SpringbootApplication.class, args);
    context.getBean(DataSourceProperties.class).show();
  }
}

打印结果
ds.url=jdbc:mysql://localhost:3306/test
ds.driverClassName=com.mysql.jdbc.Driver
ds.userName=root
ds.password=tiger

@SpringBootApplication
public class SpringbootApplication extends SpringBootServletInitializer {

  @Override
  protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
    return application.sources(SpringbootApplication.class);
  }

  public static void main(String[] args) {
    SpringApplication.run(SpringbootApplication.class, args);
  }
}

<packaging>war</packaging>
移除内置 tomcat：
<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-web</artifactId>
	<exclusions>
		<exclusion>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-tomcat</artifactId>
		</exclusion>
	</exclusions>
</dependency>
<!-- Servlet API -->
<dependency>
	<groupId>javax.servlet</groupId>
	<artifactId>javax.servlet-api</artifactId>
	<version>3.1.0</version>
	<scope>provided</scope>
</dependency>