bleAutoConfiguration=\
org.springframework.boot.autoconfigure.admin.SpringApplicationAdminJmxAutoConfiguration,\
org.springframework.boot.autoconfigure.aop.AopAutoConfiguration,\
org.springframework.boot.autoconfigure.amqp.RabbitAutoConfiguration,\
org.springframework.boot.autoconfigure.batch.BatchAutoConfiguration,\
org.springframework.boot.autoconfigure.cache.CacheAutoConfiguration,\
......
......
org.springframework.boot.autoconfigure.web.client.RestTemplateAutoConfiguration,\
org.springframework.boot.autoconfigure.web.embedded.EmbeddedWebServerFactoryCustomizerAutoConfiguration,\
org.springframework.boot.autoconfigure.web.reactive.HttpHandlerAutoConfiguration,\
org.springframework.boot.autoconfigure.web.reactive.ReactiveWebServerFactoryAutoConfiguration,\
org.springframework.boot.autoconfigure.web.reactive.WebFluxAutoConfiguration,\
org.springframework.boot.autoconfigure.web.reactive.error.ErrorWebFluxAutoConfiguration,\
org.springframework.boot.autoconfigure.web.reactive.function.client.ClientHttpConnectorAutoConfiguration,\
org.springframework.boot.autoconfigure.web.reactive.function.client.WebClientAutoConfiguration,\
org.springframework.boot.autoconfigure.web.servlet.DispatcherServletAutoConfiguration,\
org.springframework.boot.autoconfigure.web.servlet.ServletWebServerFactoryAutoConfiguration,\
org.springframework.boot.autoconfigure.web.servlet.error.ErrorMvcAutoConfiguration,\
org.springframework.boot.autoconfigure.web.servlet.HttpEncodingAutoConfiguration,\
org.springframework.boot.autoconfigure.web.servlet.MultipartAutoConfiguration,\
org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration,\
org.springframework.boot.autoconfigure.websocket.reactive.WebSocketReactiveAutoConfiguration,\
每一个 xxxAutoConfiguration 类都是容器中的一个组件，都加入到容器中，用它们来做自动配置。
2 自动配置分析
在上一节基础上，我们知道每一个自动配置类进行自动配置功能，下面我们以 HttpEncodingAutoConfiguration 为例来分析：
2.1 配置参数
@ConfigurationProperties(
prefix = "spring.http"//①
)
public class HttpProperties {
private boolean logRequestDetails;
private final HttpProperties.Encoding encoding = new HttpProperties.Encoding();//②
......
public static class Encoding {
public static final Charset DEFAULT_CHARSET;
private Charset charset;
private Boolean force;
private Boolean forceRequest;
private Boolean forceResponse;
private Map<Locale, Charset> mapping;
public Encoding() {
this.charset = DEFAULT_CHARSET;//②
}
......
static {
DEFAULT_CHARSET = StandardCharsets.UTF_8;//②
}
......
}
代码解析：
- 在 application.properties 文件中配置的时候指定前缀是 spring.http；
- 指定默认的编码方式是 UTF-8，如果需要修改，可使用 spring.http.encoding.charset=编码。
2.2 自动配置类
@Configuration//①
@EnableConfigurationProperties({HttpProperties.class})//②
@ConditionalOnWebApplication(
type = Type.SERVLET
)//③
@ConditionalOnClass({CharacterEncodingFilter.class})//④
@ConditionalOnProperty(
prefix = "spring.http.encoding",
value = {"enabled"},
matchIfMissing = true
)//⑤
public class HttpEncodingAutoConfiguration {
private final Encoding properties;
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