API中的url增加版本号

1、定义注解：@ApiVersion

@Target({ElementType.METHOD,ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Mapping
public @interface ApiVersion {
	/**
     * 标识版本号
     * @return
     */
    int value();
    //描述
    String describe();
}

2、重写RequestMappingHandlerMapping一些方法

public class CustomRequestMappingHandlerMapping 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 createCondition(ApiVersion apiVersion) {
        return apiVersion == null ? null : new ApiVersionCondition(apiVersion.value());
    }

}

3、匹配规则版本号

public class ApiVersionCondition implements RequestCondition {
	
	// 路径中版本的前缀， 这里用 /v[1-9]/的形式
    private final static Pattern VERSION_PREFIX_PATTERN = Pattern.compile("v(\\d+)/");
 
    /**
     * api的版本
     */
    private int apiVersion;
 
    public ApiVersionCondition(int apiVersion) {
        this.apiVersion = apiVersion;
    }
 
 
    @Override
    public ApiVersionCondition combine(ApiVersionCondition apiVersionCondition) {
        // 采用最后定义优先原则，则方法上的定义覆盖类上面的定义
        return new ApiVersionCondition(apiVersionCondition.getApiVersion());
    }
 
 
    /**
     * 根据request查找匹配到的筛选条件
     */
    @Override
    public ApiVersionCondition getMatchingCondition(HttpServletRequest httpServletRequest) {
        Matcher m = VERSION_PREFIX_PATTERN.matcher(httpServletRequest.getRequestURI());
        if(m.find()){
            Integer version = Integer.valueOf(m.group(1));
            if(version >= this.apiVersion)
            {
                return this;
            }
        }
        return null;
    }
 
    /**
     * 不同筛选条件比较,用于排序
     * @param apiVersionCondition
     * @param httpServletRequest
     * @return
     */
    @Override
    public int compareTo(ApiVersionCondition apiVersionCondition, HttpServletRequest httpServletRequest) {
        // 优先匹配最新的版本号
        return apiVersionCondition.getApiVersion() - this.apiVersion;
    }
 
    public int getApiVersion() {
        return apiVersion;
    }

}

4、增加相应注解

@ApiVersion(value=1,describe="当前版本控制为v1")
@RequestMapping("{version}")
public class BaseApi {
}

5、请求路径：http://localhost:8080/v1/xxxx