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@EnableWebMvc,WebMvcConfigurationSupport,WebMvcConfigurer和WebMvcConfigurationAdapter区别

@EnableWebMvc是什么

直接看源码,@EnableWebMvc实际上引入一个DelegatingWebMvcConfiguration。

@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE})
@Documented
@Import({DelegatingWebMvcConfiguration.class})
public @interface EnableWebMvc {
}

DelegatingWebMvcConfiguration继承了WebMvcConfigurationSupport

@Configuration
public class DelegatingWebMvcConfiguration extends WebMvcConfigurationSupport {
...

所以@EnableWebMvc=继承DelegatingWebMvcConfiguration=继承WebMvcConfigurationSupport

@EnableWebMvc和@EnableAutoConfiguration的关系

@EnableAutoConfiguration是springboot项目的启动类注解@SpringBootApplication的子元素，主要功能为自动配置。

@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
@SpringBootConfiguration
@EnableAutoConfiguration
@ComponentScan(
    excludeFilters = {@Filter(
    type = FilterType.CUSTOM,
    classes = {TypeExcludeFilter.class}
), @Filter(
    type = FilterType.CUSTOM,
    classes = {AutoConfigurationExcludeFilter.class}
)}
)
public @interface SpringBootApplication {
...
}

@EnableAutoConfiguration实际是导入了EnableAutoConfigurationImportSelector和Registrar两个类

@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
@AutoConfigurationPackage
@Import({AutoConfigurationImportSelector.class})
public @interface EnableAutoConfiguration {
...
}

@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
@Import({Registrar.class})
public @interface AutoConfigurationPackage {
}
这两个类的具体原理有些复杂，不太清除，主要内容是通过SpringFactoriesLoader.loadFactoryNames()导入jar下面的配置文件META-INF/spring.factories

protected List<String> getCandidateConfigurations(AnnotationMetadata metadata, AnnotationAttributes attributes) {
        List<String> configurations = SpringFactoriesLoader.loadFactoryNames(this.getSpringFactoriesLoaderFactoryClass(), this.getBeanClassLoader());
        Assert.notEmpty(configurations, "No auto configuration classes found in META-INF/spring.factories. If you are using a custom packaging, make sure that file is correct.");
        return configurations;
    }

配置文件中的内容如下

# Auto Configure
org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
org.springframework.boot.autoconfigure.admin.SpringApplicationAdminJmxAutoConfiguration,\
...
org.springframework.boot.autoconfigure.web.servlet.HttpEncodingAutoConfiguration,\
org.springframework.boot.autoconfigure.web.servlet.MultipartAutoConfiguration,\
org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration,\
...

其中有WebMvcAutoConfiguration,WebMvcAutoConfiguration源码如下

@Configuration
@ConditionalOnWebApplication(
    type = Type.SERVLET
)
@ConditionalOnClass({Servlet.class, DispatcherServlet.class, WebMvcConfigurer.class})
@ConditionalOnMissingBean({WebMvcConfigurationSupport.class})
@AutoConfigureOrder(-2147483638)
@AutoConfigureAfter({DispatcherServletAutoConfiguration.class, ValidationAutoConfiguration.class})
public class WebMvcAutoConfiguration {
...
}

@ConditionalOnMissingBean({WebMvcConfigurationSupport.class})意思是如果存在它修饰的类的bean
,则不需要再创建这个bean。
由此可得出结论：
如果有配置文件继承了DelegatingWebMvcConfiguration，
或者WebMvcConfigurationSupport，或者配置文件有@EnableWebMvc，那么 @EnableAutoConfiguration 中的
WebMvcAutoConfiguration 将不会被自动配置，而是使用WebMvcConfigurationSupport的配置。

@EnableWebMvc,WebMvcConfigurationSupport,WebMvcConfigurer和WebMvcConfigurationAdapter使用

WebMvcConfigurationAdapter已经废弃，最好用implements WebMvcConfigurer代替

@Configuration
public class MyConfig implements WebMvcConfigurer {
    
}

如果使用继承,WebMvcConfigurationSupport，DelegatingWebMvcConfiguration，或者使用@EnableWebMvc，

需要注意会覆盖application.properties中关于WebMvcAutoConfiguration的设置，需要在自定义配置中实现，如

springboot2.0、spring5.0 拦截器配置WebMvcConfigurerAdapter过时使用WebMvcConfigurationSupport来代替 新坑

示例如下

Configuration
@EnableWebMvc
public class MyConfig implements WebMvcConfigurer {

}

@Configuration
public class MyConfig extends WebMvcConfigurationSupport {

}

@Configuration
public class MyConfig extends DelegatingWebMvcConfiguration {

}
上面代码中需要在类中实现关于WebMvcAutoConfiguration的配置，而不是在application.properties中。


总结

implements WebMvcConfigurer ： 不会覆盖@EnableAutoConfiguration关于WebMvcAutoConfiguration的配置
@EnableWebMvc + implements WebMvcConfigurer ： 会覆盖@EnableAutoConfiguration关于WebMvcAutoConfiguration的配置
extends WebMvcConfigurationSupport ：会覆盖@EnableAutoConfiguration关于WebMvcAutoConfiguration的配置
extends DelegatingWebMvcConfiguration ：会覆盖@EnableAutoConfiguration关于WebMvcAutoConfiguration的配置

c# – Azure类库访问GetConfigurationSettingValue与web.config

<add key="SendEmails" value="true"/>

<Setting name="SendEmails" value="true"/>

if (RoleEnvironment.IsAvailable)
 return RoleEnvironment.GetConfigurationSettingValue("mySetting");
else
 return ConfigurationManager.AppSettings["mySetting"].ToString();

io.dropwizard.configuration.ConfigurationValidationException的实例源码

@Override
public T get() {
  final Configuration configuration = clazz.getAnnotation(Configuration.class);

  try {
    final File baseFile = new File(configuration.filename());
    final T baseConfig = baseFile.exists() ? objectMapper.readValue(baseFile,clazz) : clazz.newInstance();

    final JsonNode overrideNode = filename.isPresent() ? loadYamlField(filename.get(),configuration.consolidatedField()) : objectMapper.createObjectNode();

    final T config = objectMapper.readerForUpdating(baseConfig).readValue(overrideNode);

    final Set<ConstraintViolation<T>> violations = validator.validate(config);
    if (!violations.isEmpty()) {
      throw new ConfigurationValidationException(filename.or(configuration.filename()),violations);
    }

    return config;
  } catch (Exception e) {
    throw Throwables.propagate(e);
  }
}

@Override
public T get() {
  final Configuration configuration = clazz.getAnnotation(Configuration.class);

  try {
    final File baseFile = new File(configuration.filename());
    final T baseConfig = baseFile.exists() ? objectMapper.readValue(baseFile,violations);
    }

    return config;
  } catch (Exception e) {
    throw Throwables.propagate(e);
  }
}

public static DdlConfiguration parseDdlConfiguration(File file) throws IOException,ConfigurationException {
    // Similar to Dropwizard's ConfigurationFactory but ignores System property overrides.
    ObjectMapper mapper = CustomJsonObjectMapperFactory.build(new YAMLFactory());
    mapper.configure(DeserializationFeature.FAIL_ON_UNKNowN_PROPERTIES,true);
    DdlConfiguration ddlConfiguration = mapper.readValue(file,DdlConfiguration.class);

    Set<ConstraintViolation<DdlConfiguration>> errors = _validator.validate(ddlConfiguration);
    if (!errors.isEmpty()) {
        throw new ConfigurationValidationException(file.toString(),errors);
    }

    return ddlConfiguration;
}

@Test(expected = ConfigurationValidationException.class)
public void testThatInvalidConfigurationFailsToBeBuilt() throws Exception {
    buildConfigurationFromString("dropwizard/invalid-conf.yml");
}

@Test(expected = ConfigurationValidationException.class)
public void testThatConfigurationWithEmptyValueFailsToBeBuilt() throws Exception {
    buildConfigurationFromString("dropwizard/empty-conf.yml");
}

java – ContextConfiguration一起运行WebAppConfiguration注释

    @ContextConfiguration(locations = { "classpath:pathToXml.xml" })
    @RunWith(SpringJUnit4ClassRunner.class)
    @WebAppConfiguration

我们今天的关于如何configurationSVN的Web访问不同的写权限？和webdav访问nas的分享已经告一段落，感谢您的关注，如果您想了解更多关于@EnableWebMvc,WebMvcConfigurationSupport,WebMvcConfigurer和WebMvcConfigurationAdapter区别、c# – Azure类库访问GetConfigurationSettingValue与web.config、io.dropwizard.configuration.ConfigurationValidationException的实例源码、java – ContextConfiguration一起运行WebAppConfiguration注释的相关信息，请在本站查询。