问截取请求并发送到外部
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Stack Overflow用户

提问于 2019-07-29 14:18:13

回答 1查看 75关注 0票数 5

我正在开发一个Spring boot项目。

我的控制器的一个例子：

@Controller
public class RestController {

    @GetMapping(value = "/student/{studentId}")
    public @ResponseBody Student getData(@PathVariable Integer studentId) {
        Student student = new Student();
        student.setName("Peter");
        student.setId(studentId);

        return student;
    }
}

我还实现了其他端点。

我需要拦截到达我的端点的每个请求，并将请求转发到另一个服务(微服务)，换句话说，我需要将每个请求转发到与当前web应用运行在同一本地计算机上的另一个web应用，基于来自该服务的响应来决定是否继续转发请求。

我的粗略想法是使用HandlerIntercept，但我不确定我是否走对了方向。有人能分享一些经验吗?实现这一目标的最好方法是什么？如果你能展示一些示例代码，那就太好了。提前谢谢。

spring-boot

spring-mvc

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回答 1

Stack Overflow用户

发布于 2019-07-29 14:57:19

您可以使用HandlerInterceptorAdapter。

如下定义拦截器。

@Component
public class RequestInterceptor extends HandlerInterceptorAdapter {

    @Override
    public boolean preHandle(HttpServletRequest request,
                             HttpServletResponse response, Object object) throws Exception {
        System.out.println("In preHandle we are Intercepting the Request");
        System.out.println("____________________________________________");
        //Call the Rest API and Validate 
        if (conditionsNotMet()) {
           response.getWriter().write("something");
           response.setStatus(someErrorCode);

           return false;
        }
    }

}

注册HandlerInterceptorAdapter

@Configuration
public class PathMatchingConfigurationAdapter extends WebMvcConfigurerAdapter {

    @Autowired
    private RequestInterceptor requestInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(requestInterceptor);
    }
}

使用WebMvcConfigurer

@Configuration
public class PathMatchingConfigurationAdapter implements WebMvcConfigurer {

    @Autowired
    private RequestInterceptor requestInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(requestInterceptor);
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry resourceHandlerRegistry) {

    }

    @Override
    public void addCorsMappings(CorsRegistry corsRegistry) {

    }

    @Override
    public void addViewControllers(ViewControllerRegistry viewControllerRegistry) {

    }

    @Override
    public void configureViewResolvers(ViewResolverRegistry viewResolverRegistry) {

    }

    @Override
    public void addArgumentResolvers(List<HandlerMethodArgumentResolver> list) {

    }

    @Override
    public void addReturnValueHandlers(List<HandlerMethodReturnValueHandler> list) {

    }

    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> list) {

    }

    @Override
    public void extendMessageConverters(List<HttpMessageConverter<?>> list) {

    }

    @Override
    public void configureHandlerExceptionResolvers(List<HandlerExceptionResolver> list) {

    }

    @Override
    public void extendHandlerExceptionResolvers(List<HandlerExceptionResolver> list) {

    }

    @Override
    public Validator getValidator() {
        return null;
    }

    @Override
    public MessageCodesResolver getMessageCodesResolver() {
        return null;
    }

    @Override
    public void configureContentNegotiation(ContentNegotiationConfigurer configurer) {
        configurer.favorPathExtension(false);
    }

    @Override
    public void configureAsyncSupport(AsyncSupportConfigurer asyncSupportConfigurer) {

    }

    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer defaultServletHandlerConfigurer) {

    }

    @Override
    public void addFormatters(FormatterRegistry formatterRegistry) {

    }

    @Override
    public void configurePathMatch(PathMatchConfigurer configurer) {
        configurer.setUseSuffixPatternMatch(false);
    }
}