1 覆盖 Spring Boot 自动配置
这里有个不错的例子；项目对mvc请求的WebMvcConfigurerAdapter 请求的头信息进行重新设置
@SpringBootApplication
public class Application extends WebMvcConfigurerAdapter {

    @Override
    public void configureContentNegotiation(ContentNegotiationConfigurer configurer) {
        Map<String, MediaType> mediaTypes = new HashMap<>();
        mediaTypes.put("json", MediaType.APPLICATION_JSON_UTF8);
        mediaTypes.put("html", MediaType.TEXT_HTML);
        configurer.favorPathExtension(false);
        configurer.defaultContentType(MediaType.APPLICATION_JSON_UTF8);
        configurer.ignoreAcceptHeader(true);
        configurer.mediaTypes(mediaTypes);

    }
}


2 通过属性文件外置配置
项目中引用是适用antx.properties,和Dimond配置读取定义的外部配置;

2.1 自动配置微调
禁用模板缓存
    如果你希望每次运行时都禁用缓存，可以创建一个application.yml，包含以下内容：
    spring:
        thymeleaf:
            cache: false
 配置嵌入式服务器
    server:
        port: 8000
配置日志
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-log4j</artifactId>
</dependency>
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <include resource="org/springframework/boot/logging/logback/defaults.xml" />

    <property name="APP_NAME" value="fin-ir-web" />
    <property name="LOG_PATH" value="${user.home}/${APP_NAME}/logs" />
    <property name="LOG_FILE" value="${LOG_PATH}/${APP_NAME}.log" />
    <property name="CONSOLE_LOG_PATTERN" value="[%d{yyyy-MM-dd HH:mm:ss.SSS}][%level][%class:%line]%msg%n" />
    <property name="FILE_LOG_PATTERN" value="[%d{yyyy-MM-dd HH:mm:ss.SSS}][%level][%class:%line]%msg%n" />

    <appender name="APPLICATION" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${LOG_FILE}</file>
        <encoder>
            <pattern>${FILE_LOG_PATTERN}</pattern>
        </encoder>
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            <fileNamePattern>${LOG_FILE}.%d{yyyy-MM-dd}.%i.log</fileNamePattern>
            <maxHistory>30</maxHistory>
            <maxFileSize>50MB</maxFileSize>
            <totalSizeCap>20GB</totalSizeCap>
        </rollingPolicy>
    </appender>

    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>${CONSOLE_LOG_PATTERN}</pattern>
            <charset>utf8</charset>
        </encoder>
    </appender>

    <root level="INFO">
        <appender-ref ref="CONSOLE" />
        <appender-ref ref="APPLICATION" />
    </root>

</configuration>

配置数据源
spring:
datasource:
url: jdbc:mysql://localhost/readinglist
username: dbuser
password: dbpass
driver-class-name: com.mysql.jdbc.Driver
2.2 应用程序 Bean 的配置外置
@Value，ConfigurationProperties等获取属性配置值