在spring boot项目中，如果要进行restful接口的版本控制一般有以下几个方向：

• 基于path的版本控制
• 基于header的版本控制

在spring MVC下，url映射到哪个method是由RequestMappingHandlerMapping来控制的，那么我们也是通过 RequestMappingHandlerMapping来做版本控制的

1.path控制

首先写一个annocation

@Target({ElementType.METHOD,ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface ApiVersion {
    String value();
}

ApiVersionCondition 用来控制当前request 指向哪个method

public class ApiVersionCondition implements RequestCondition<ApiVersionCondition> {
    private static final Pattern VERSION_PREFIX_PATTERN = Pattern.compile("/(v\\d+)/");

    private final String version;

    public ApiVersionCondition(String version) {
        this.version = version;
    }

    @Override
    public ApiVersionCondition combine(ApiVersionCondition apiVersionCondition) {
        return null;
    }

    @Override
    public ApiVersionCondition getMatchingCondition(HttpServletRequest httpServletRequest) {
        Matcher m = VERSION_PREFIX_PATTERN.matcher(httpServletRequest.getRequestURI());
        if (m.find()) {
            String pathVersion = m.group(1);
            if (Objects.equals(pathVersion, version)) {
                return this;
            }
        }
        return null;
    }

    @Override
    public int compareTo(ApiVersionCondition apiVersionCondition, HttpServletRequest httpServletRequest) {
        return 0;
    }
}

PathVersionHandlerMapping

public class PathVersionHandlerMapping extends RequestMappingHandlerMapping {

    @Override
    protected boolean isHandler(Class<?> beanType) {
        return AnnotatedElementUtils.hasAnnotation(beanType, Controller.class);
    }

    @Override
    protected RequestCondition<?> getCustomTypeCondition(Class<?> handlerType) {
        ApiVersion apiVersion = AnnotationUtils.findAnnotation(handlerType,ApiVersion.class);
        return createCondition(apiVersion);
    }

    @Override
    protected RequestCondition<?> getCustomMethodCondition(Method method) {
        ApiVersion apiVersion = AnnotationUtils.findAnnotation(method,ApiVersion.class);
        return createCondition(apiVersion);
    }

    private RequestCondition<ApiVersionCondition>createCondition(ApiVersion apiVersion) {
        return apiVersion == null ? null : new ApiVersionCondition(apiVersion.value());
    }
}

WebMvcConfiguration

@Configuration
public class WebMvcConfiguration implements WebMvcRegistrations {

    @Override
    public RequestMappingHandlerMapping getRequestMappingHandlerMapping() {
        return new PathVersionHandlerMapping();
    }
}

Controller

@RestController
@RequestMapping(value = "/{version}/article")
public class ArticleController {

    @GetMapping(value = "one")
    public String query(){
        return "article api default";
    }

    @GetMapping(value = "one")
    @ApiVersion("v1")
    public String query2(){
        return "article api v1";
    }
}

根据代码逻辑如果version是v1 那么就会匹配到v1的方法，否则则会匹配到默认方法。

达到预期。

2.header控制

annocation

@Target({ElementType.METHOD,ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface ApiVersion {
    String value();
}

ApiVersionCondition

public class ApiVersionCondition implements RequestCondition<ApiVersionCondition> {
    private static final String X_VERSION = "X-VERSION";

    private final String version ;

    public ApiVersionCondition(String version) {
        this.version = version;
    }

    @Override
    public ApiVersionCondition combine(ApiVersionCondition apiVersionCondition) {
        return null;
    }

    @Override
    public ApiVersionCondition getMatchingCondition(HttpServletRequest httpServletRequest) {
        String headerVersion = httpServletRequest.getHeader(X_VERSION);
        if(Objects.equals(version,headerVersion)){
            return this;
        }
        return null;
    }

    @Override
    public int compareTo(ApiVersionCondition apiVersionCondition, HttpServletRequest httpServletRequest) {
        return 0;
    }
}

HeaderVersionRequestMappingHandlerMapping

public class HeaderVersionRequestMappingHandlerMapping extends RequestMappingHandlerMapping {
    @Override
    protected RequestCondition<?> getCustomTypeCondition(Class<?> handlerType) {
        ApiVersion apiVersion = AnnotationUtils.findAnnotation(handlerType,ApiVersion.class);
        return createCondition(apiVersion);
    }

    @Override
    protected RequestCondition<?> getCustomMethodCondition(Method method) {
        ApiVersion apiVersion = AnnotationUtils.findAnnotation(method,ApiVersion.class);
        return createCondition(apiVersion);
    }

    private RequestCondition<ApiVersionCondition>createCondition(ApiVersion apiVersion) {
        return apiVersion == null ? null : new ApiVersionCondition(apiVersion.value());
    }
}

WebMvcConfiguration

@Configuration
public class WebMvcConfiguration implements WebMvcRegistrations {

    @Override
    public RequestMappingHandlerMapping getRequestMappingHandlerMapping() {
        return new HeaderVersionRequestMappingHandlerMapping();
    }
}

Controller

@RestController
@RequestMapping(value = "question")
public class QuestionController {

    @GetMapping(value = "one")
    public String query(){
        return "default";
    }

    @GetMapping(value = "one")
    @ApiVersion("v1")
    public String query2(){
        return "v1";
    }
}

效果截图

达到预期。

至于用哪种模式，根据自己情况选择就可以。