Junit mockito 测试Controller层方法有Pageable异常
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1、问题
在使用MockMVC+Mockito模拟Service层返回的时候，当我们在Controller层中参数方法调用有Pageable对象的时候，我们会发现，我们没办法生成一个Pageable的对象，会报一个Pageable是一个接口的错误。当我们把所有的参数从Pageable接口变成Pageable的实现类PageRequest的时候，所有的方法参数都换成PageRequest，又会出现一个新的错误，且不说PageRequest不能作为参数用于hibernate的分页查询，另一方面，它没有构造方法，也无法初始化。
2、代码
1）controller代码，主要是
@RequestMapping("/banners")
public DataMap showBanners(BannerQuery bannerQuery, @PageableDefault(sort = "createdAt", direction = Sort.Direction.DESC) Pageable pageable) {
Page<Banner> page = bannerService.findPage(bannerQuery, pageable);
return new DataMap().addAttribute(Constants.STATUS_CODE, StatusCode.SUCCESS.getStatusCode())
.addAttribute(Constants.DATA, page);
}
2）测试方法：
@Test public void showBannersWithWhenTest() throws Exception { Banner banner = new Banner(); banner.setBannerUrl("www.baidu.com"); banner.setActionUrl("hhtp"); List<Banner> list = new ArrayList<>(); list.add(banner); Page<Banner> page = new PageImpl<Banner>(list); when(bannerService.findPage(isA(BannerQuery.class),isA(Pageable.class))).thenReturn(page); //mock绑定了放回 //生成一个发送请求的类 RequestBuilder rb = get("/banners") //请求的url .param("page","0") //请求的参数 .param("size","5") .contentType(MediaType.APPLICATION_FORM_URLENCODED); String responseString = mockMvc.perform(rb) .andDo(print()) //添加ResultHandler结果处理器，比如调试时打印结果到控制台 /* .andExpect(jsonPath("$.data.content").isArray()) //判断返回的数据是否是一个数组*/ .andExpect(status().isOk()) //判断返回的状态是否为200 /*.andExpect(jsonPath("$.data.content",hasSize(5))) //判断返回的json对象的data.content属性的大小是否为5 //判断返回的data.content中的第一个对象的uid属性是否为所给值 .andExpect(jsonPath("$.data.content[0].uid",is("81377051ddb6424fa677931ab1bc6496"))) .andExpect(jsonPath("$.data.content[1].uid",is("8cb7b04fdea846d2ab6006fa1280a8b8")))*/ .andReturn().getResponse().getContentAsString(); System.out.println("--------showCategorysTest()返回的json = " + responseString); }
3）报错：
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.domain.Pageable]: Specified class is an interface
全部内容
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/.m2/repository/org/hamcrest/hamcrest-library/1.2.1/hamcrest-library-1.2.1.jar" com.intellij.rt.execution.junit.JUnitStarter -ideVersion5 com.seewo.site.controller.BannerControllerUseWhenTest,showBannersWithWhenTest Connected to the target VM, address: \'127.0.0.1:59469\', transport: \'socket\' org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.domain.Pageable]: Specified class is an interface at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:978) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857) at javax.servlet.http.HttpServlet.service(HttpServlet.java:668) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842) at org.springframework.test.web.servlet.TestDispatcherServlet.service(TestDispatcherServlet.java:66) at javax.servlet.http.HttpServlet.service(HttpServlet.java:770) at org.springframework.mock.web.MockFilterChain$ServletFilterProxy.doFilter(MockFilterChain.java:168) at org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:136) at org.springframework.test.web.servlet.MockMvc.perform(MockMvc.java:134) at com.seewo.site.controller.BannerControllerUseWhenTest.showBannersWithWhenTest(BannerControllerUseWhenTest.java:146) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26) at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74) at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83) at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:88) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229) at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26) at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71) at org.junit.runners.ParentRunner.run(ParentRunner.java:309) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174) at org.junit.runner.JUnitCore.run(JUnitCore.java:160) at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:117) at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:234) at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:74) Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.domain.Pageable]: Specified class is an interface at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:101) at org.springframework.web.method.annotation.ModelAttributeMethodProcessor.createAttribute(ModelAttributeMethodProcessor.java:139) at org.springframework.web.servlet.mvc.method.annotation.ServletModelAttributeMethodProcessor.createAttribute(ServletModelAttributeMethodProcessor.java:79) at org.springframework.web.method.annotation.ModelAttributeMethodProcessor.resolveArgument(ModelAttributeMethodProcessor.java:105) at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:77) at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:157) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:124) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:781) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:721) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966) ... 37 more Disconnected from the target VM, address: \'127.0.0.1:59469\', transport: \'socket\' Process finished with exit code 255
3、解决方法：
报错的原因：没有Pageable的解析器。
解决的方法：给他设置一个解析器
1）使用匿名内部类
@Before() public void setup() { MockitoAnnotations.initMocks(this); mockMvc = MockMvcBuilders.standaloneSetup(bannerController).setCustomArgumentResolvers(new PageableHandlerMethodArgumentResolver()) .setViewResolvers(new ViewResolver() { @Override public View resolveViewName(String viewName, Locale locale) throws Exception { return new MappingJackson2JsonView(); } } ) .build(); }
2）通过注解的方式注入一个PageableHandlerMethodArgumentResolver 解析器
@InjectMocks
private PageableHandlerMethodArgumentResolver pageableArgumentResolver;
@Before() public void setup() { MockitoAnnotations.initMocks(this); mockMvc = MockMvcBuilders.standaloneSetup(bannerController).setCustomArgumentResolvers(pageableArgumentResolver) .build(); }
解决方法1：http://stackoverflow.com/questions/22174665/isolated-controller-test-cant-instantiate-pageable
解决方法2：http://stackoverflow.com/questions/30057262/failed-to-instantiate-pageable-bean
致谢：感谢您的阅读！
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