spring-mvc - 如何测试 Spring HandlerInterceptor 映射

Question

我正在实现 HandlerInterceptor需要在处理对多个路径的请求之前/之后执行业务逻辑。我想通过模拟请求句柄生命周期来测试拦截器的执行。

以下是拦截器的注册方式:

<mvc:interceptors>
    <mvc:interceptor>
        <mvc:mapping path="/test*"/>
        <bean class="x.y.z.TestInterceptor" />
    </mvc:interceptor>
</mvc:interceptors>

我不仅要测试 preHandle和 postHandle方法，但也映射到路径。

Answer 1

可以借助 JUnit 和 spring-test 编写以下测试:

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = { "classpath*:META-INF/spring.xml", ... })
public class InterceptorTest {

@Autowired
private RequestMappingHandlerAdapter handlerAdapter;

@Autowired
private RequestMappingHandlerMapping handlerMapping;

@Test
public void testInterceptor() throws Exception{


    MockHttpServletRequest request = new MockHttpServletRequest();
    request.setRequestURI("/test");
    request.setMethod("GET");


    MockHttpServletResponse response = new MockHttpServletResponse();

    HandlerExecutionChain handlerExecutionChain = handlerMapping.getHandler(request);

    HandlerInterceptor[] interceptors = handlerExecutionChain.getInterceptors();

    for(HandlerInterceptor interceptor : interceptors){
        interceptor.preHandle(request, response, handlerExecutionChain.getHandler());
    }

    ModelAndView mav = handlerAdapter. handle(request, response, handlerExecutionChain.getHandler());

    for(HandlerInterceptor interceptor : interceptors){
        interceptor.postHandle(request, response, handlerExecutionChain.getHandler(), mav);
    }

    assertEquals(200, response.getStatus());
    //assert the success of your interceptor

}

HandlerExecutionChain填充了特定请求的所有映射拦截器。如果映射失败，拦截器将不会出现在列表中，因此不会被执行，最后的断言将失败。