org.springframework.web.servlet.view.ContentNegotiatingViewResolver Java Examples

@Test
public void testContentNegotiationManager() throws Exception {
	loadBeanDefinitions("mvc-config-content-negotiation-manager.xml");

	RequestMappingHandlerMapping mapping = appContext.getBean(RequestMappingHandlerMapping.class);
	ContentNegotiationManager manager = mapping.getContentNegotiationManager();

	MockHttpServletRequest request = new MockHttpServletRequest("GET", "/foo.xml");
	NativeWebRequest webRequest = new ServletWebRequest(request);
	assertEquals(Collections.singletonList(MediaType.valueOf("application/rss+xml")),
			manager.resolveMediaTypes(webRequest));

	ViewResolverComposite compositeResolver = this.appContext.getBean(ViewResolverComposite.class);
	assertNotNull(compositeResolver);
	assertEquals("Actual: " + compositeResolver.getViewResolvers(), 1, compositeResolver.getViewResolvers().size());

	ViewResolver resolver = compositeResolver.getViewResolvers().get(0);
	assertEquals(ContentNegotiatingViewResolver.class, resolver.getClass());
	ContentNegotiatingViewResolver cnvr = (ContentNegotiatingViewResolver) resolver;
	assertSame(manager, cnvr.getContentNegotiationManager());
}
 

private BeanDefinition createContentNegotiatingViewResolver(Element resolverElement, ParserContext context) {
	RootBeanDefinition beanDef = new RootBeanDefinition(ContentNegotiatingViewResolver.class);
	beanDef.setSource(context.extractSource(resolverElement));
	beanDef.setRole(BeanDefinition.ROLE_INFRASTRUCTURE);
	MutablePropertyValues values = beanDef.getPropertyValues();

	List<Element> elements = DomUtils.getChildElementsByTagName(resolverElement, new String[] {"default-views"});
	if (!elements.isEmpty()) {
		ManagedList<Object> list = new ManagedList<Object>();
		for (Element element : DomUtils.getChildElementsByTagName(elements.get(0), "bean", "ref")) {
			list.add(context.getDelegate().parsePropertySubElement(element, null));
		}
		values.add("defaultViews", list);
	}
	if (resolverElement.hasAttribute("use-not-acceptable")) {
		values.add("useNotAcceptableStatusCode", resolverElement.getAttribute("use-not-acceptable"));
	}
	Object manager = MvcNamespaceUtils.getContentNegotiationManager(context);
	if (manager != null) {
		values.add("contentNegotiationManager", manager);
	}
	return beanDef;
}
 

private void initContentNegotiatingViewResolver(View[] defaultViews) {
	// ContentNegotiatingResolver in the registry: elevate its precedence!
	this.order = (this.order != null ? this.order : Ordered.HIGHEST_PRECEDENCE);

	if (this.contentNegotiatingResolver != null) {
		if (!ObjectUtils.isEmpty(defaultViews)) {
			if (!CollectionUtils.isEmpty(this.contentNegotiatingResolver.getDefaultViews())) {
				List<View> views = new ArrayList<View>(this.contentNegotiatingResolver.getDefaultViews());
				views.addAll(Arrays.asList(defaultViews));
				this.contentNegotiatingResolver.setDefaultViews(views);
			}
		}
	}
	else {
		this.contentNegotiatingResolver = new ContentNegotiatingViewResolver();
		this.contentNegotiatingResolver.setDefaultViews(Arrays.asList(defaultViews));
		this.contentNegotiatingResolver.setViewResolvers(this.viewResolvers);
		this.contentNegotiatingResolver.setContentNegotiationManager(this.contentNegotiationManager);
	}
}
 

@Bean
public ViewResolver contentNegotiatingViewResolver() {
    log.debug("Configuring the ContentNegotiatingViewResolver");
    ContentNegotiatingViewResolver viewResolver = new ContentNegotiatingViewResolver();
    List<ViewResolver> viewResolvers = new ArrayList<ViewResolver>();

    UrlBasedViewResolver urlBasedViewResolver = new UrlBasedViewResolver();
    urlBasedViewResolver.setViewClass(JstlView.class);
    urlBasedViewResolver.setPrefix("/WEB-INF/pages/");
    urlBasedViewResolver.setSuffix(".jsp");
    viewResolvers.add(urlBasedViewResolver);

    viewResolver.setViewResolvers(viewResolvers);

    List<View> defaultViews = new ArrayList<View>();
    defaultViews.add(new MappingJackson2JsonView());
    viewResolver.setDefaultViews(defaultViews);

    return viewResolver;
}
 

private void initContentNegotiatingViewResolver(View[] defaultViews) {

		// ContentNegotiatingResolver in the registry: elevate its precedence!
		this.order = (this.order == null ? Ordered.HIGHEST_PRECEDENCE : this.order);

		if (this.contentNegotiatingResolver != null) {
			if (!ObjectUtils.isEmpty(defaultViews)) {
				if (!CollectionUtils.isEmpty(this.contentNegotiatingResolver.getDefaultViews())) {
					List<View> views = new ArrayList<View>(this.contentNegotiatingResolver.getDefaultViews());
					views.addAll(Arrays.asList(defaultViews));
					this.contentNegotiatingResolver.setDefaultViews(views);
				}
			}
		}
		else {
			this.contentNegotiatingResolver = new ContentNegotiatingViewResolver();
			this.contentNegotiatingResolver.setDefaultViews(Arrays.asList(defaultViews));
			this.contentNegotiatingResolver.setViewResolvers(this.viewResolvers);
			this.contentNegotiatingResolver.setContentNegotiationManager(this.contentNegotiationManager);
		}
	}
 

private BeanDefinition createContentNegotiatingViewResolver(Element resolverElement, ParserContext context) {
	RootBeanDefinition beanDef = new RootBeanDefinition(ContentNegotiatingViewResolver.class);
	beanDef.setSource(context.extractSource(resolverElement));
	beanDef.setRole(BeanDefinition.ROLE_INFRASTRUCTURE);
	MutablePropertyValues values = beanDef.getPropertyValues();

	List<Element> elements = DomUtils.getChildElementsByTagName(resolverElement, new String[] {"default-views"});
	if (!elements.isEmpty()) {
		ManagedList<Object> list = new ManagedList<Object>();
		for (Element element : DomUtils.getChildElementsByTagName(elements.get(0), "bean", "ref")) {
			list.add(context.getDelegate().parsePropertySubElement(element, null));
		}
		values.add("defaultViews", list);
	}
	if (resolverElement.hasAttribute("use-not-acceptable")) {
		values.add("useNotAcceptableStatusCode", resolverElement.getAttribute("use-not-acceptable"));
	}
	Object manager = getContentNegotiationManager(context);
	if (manager != null) {
		values.add("contentNegotiationManager", manager);
	}
	return beanDef;
}
 

@Test
public void testContentNegotiationManager() throws Exception {
	loadBeanDefinitions("mvc-config-content-negotiation-manager.xml", 15);

	RequestMappingHandlerMapping mapping = appContext.getBean(RequestMappingHandlerMapping.class);
	ContentNegotiationManager manager = mapping.getContentNegotiationManager();

	MockHttpServletRequest request = new MockHttpServletRequest("GET", "/foo.xml");
	NativeWebRequest webRequest = new ServletWebRequest(request);
	assertEquals(Arrays.asList(MediaType.valueOf("application/rss+xml")), manager.resolveMediaTypes(webRequest));

	ViewResolverComposite compositeResolver = this.appContext.getBean(ViewResolverComposite.class);
	assertNotNull(compositeResolver);
	assertEquals("Actual: " + compositeResolver.getViewResolvers(), 1, compositeResolver.getViewResolvers().size());

	ViewResolver resolver = compositeResolver.getViewResolvers().get(0);
	assertEquals(ContentNegotiatingViewResolver.class, resolver.getClass());
	ContentNegotiatingViewResolver cnvr = (ContentNegotiatingViewResolver) resolver;
	assertSame(manager, cnvr.getContentNegotiationManager());
}
 

@Test
public void testViewResolutionWithContentNegotiation() throws Exception {
	loadBeanDefinitions("mvc-config-view-resolution-content-negotiation.xml", 7);

	ViewResolverComposite compositeResolver = this.appContext.getBean(ViewResolverComposite.class);
	assertNotNull(compositeResolver);
	assertEquals(1, compositeResolver.getViewResolvers().size());
	assertEquals(Ordered.HIGHEST_PRECEDENCE, compositeResolver.getOrder());

	List<ViewResolver> resolvers = compositeResolver.getViewResolvers();
	assertEquals(ContentNegotiatingViewResolver.class, resolvers.get(0).getClass());
	ContentNegotiatingViewResolver cnvr = (ContentNegotiatingViewResolver) resolvers.get(0);
	assertEquals(7, cnvr.getViewResolvers().size());
	assertEquals(1, cnvr.getDefaultViews().size());
	assertTrue(cnvr.isUseNotAcceptableStatusCode());

	String beanName = "contentNegotiationManager";
	DirectFieldAccessor accessor = new DirectFieldAccessor(cnvr);
	ContentNegotiationManager manager = (ContentNegotiationManager) accessor.getPropertyValue(beanName);
	assertNotNull(manager);
	assertSame(manager, this.appContext.getBean(ContentNegotiationManager.class));
}
 

@Bean
public ContentNegotiatingViewResolver contentNegotiatingViewResolver() {
    List<View> defaultViews = new ArrayList<>(2);
    defaultViews.add(jsonCatnapSpringView());
    defaultViews.add(jsonpCatnapSpringView());

    List<CatnapWrappingView> catnapViews = new ArrayList<>(2);
    catnapViews.add(jsonCatnapSpringView());
    catnapViews.add(jsonpCatnapSpringView());

    CatnapViewResolver catnapViewResolver = new CatnapViewResolver();
    catnapViewResolver.setViews(catnapViews);

    List<ViewResolver> viewResolvers = new ArrayList<>(1);
    viewResolvers.add(catnapViewResolver);

    ContentNegotiatingViewResolver cnvr = new ContentNegotiatingViewResolver();
    cnvr.setContentNegotiationManager(mvcContentNegotiationManager());
    cnvr.setOrder(1);
    cnvr.setDefaultViews(defaultViews);
    cnvr.setViewResolvers(viewResolvers);

    return cnvr;
}
 

@Test
public void testViewResolutionWithContentNegotiation() throws Exception {
	loadBeanDefinitions("mvc-config-view-resolution-content-negotiation.xml");

	ViewResolverComposite compositeResolver = this.appContext.getBean(ViewResolverComposite.class);
	assertNotNull(compositeResolver);
	assertEquals(1, compositeResolver.getViewResolvers().size());
	assertEquals(Ordered.HIGHEST_PRECEDENCE, compositeResolver.getOrder());

	List<ViewResolver> resolvers = compositeResolver.getViewResolvers();
	assertEquals(ContentNegotiatingViewResolver.class, resolvers.get(0).getClass());
	ContentNegotiatingViewResolver cnvr = (ContentNegotiatingViewResolver) resolvers.get(0);
	assertEquals(6, cnvr.getViewResolvers().size());
	assertEquals(1, cnvr.getDefaultViews().size());
	assertTrue(cnvr.isUseNotAcceptableStatusCode());

	String beanName = "contentNegotiationManager";
	DirectFieldAccessor accessor = new DirectFieldAccessor(cnvr);
	ContentNegotiationManager manager = (ContentNegotiationManager) accessor.getPropertyValue(beanName);
	assertNotNull(manager);
	assertSame(manager, this.appContext.getBean(ContentNegotiationManager.class));
	assertSame(manager, this.appContext.getBean("mvcContentNegotiationManager"));
}
 

private BeanDefinition createContentNegotiatingViewResolver(Element resolverElement, ParserContext context) {
	RootBeanDefinition beanDef = new RootBeanDefinition(ContentNegotiatingViewResolver.class);
	beanDef.setSource(context.extractSource(resolverElement));
	beanDef.setRole(BeanDefinition.ROLE_INFRASTRUCTURE);
	MutablePropertyValues values = beanDef.getPropertyValues();

	List<Element> elements = DomUtils.getChildElementsByTagName(resolverElement, "default-views");
	if (!elements.isEmpty()) {
		ManagedList<Object> list = new ManagedList<>();
		for (Element element : DomUtils.getChildElementsByTagName(elements.get(0), "bean", "ref")) {
			list.add(context.getDelegate().parsePropertySubElement(element, null));
		}
		values.add("defaultViews", list);
	}
	if (resolverElement.hasAttribute("use-not-acceptable")) {
		values.add("useNotAcceptableStatusCode", resolverElement.getAttribute("use-not-acceptable"));
	}
	Object manager = MvcNamespaceUtils.getContentNegotiationManager(context);
	if (manager != null) {
		values.add("contentNegotiationManager", manager);
	}
	return beanDef;
}
 

private ContentNegotiatingViewResolver initContentNegotiatingViewResolver(View[] defaultViews) {
	// ContentNegotiatingResolver in the registry: elevate its precedence!
	this.order = (this.order != null ? this.order : Ordered.HIGHEST_PRECEDENCE);

	if (this.contentNegotiatingResolver != null) {
		if (!ObjectUtils.isEmpty(defaultViews) &&
				!CollectionUtils.isEmpty(this.contentNegotiatingResolver.getDefaultViews())) {
			List<View> views = new ArrayList<>(this.contentNegotiatingResolver.getDefaultViews());
			views.addAll(Arrays.asList(defaultViews));
			this.contentNegotiatingResolver.setDefaultViews(views);
		}
	}
	else {
		this.contentNegotiatingResolver = new ContentNegotiatingViewResolver();
		this.contentNegotiatingResolver.setDefaultViews(Arrays.asList(defaultViews));
		this.contentNegotiatingResolver.setViewResolvers(this.viewResolvers);
		if (this.contentNegotiationManager != null) {
			this.contentNegotiatingResolver.setContentNegotiationManager(this.contentNegotiationManager);
		}
	}
	return this.contentNegotiatingResolver;
}
 

@Bean
public ContentNegotiatingViewResolver contentNegotiatingViewResolver() {
    List<View> defaultViews = new ArrayList<>(2);
    defaultViews.add(jsonCatnapSpringView());
    defaultViews.add(jsonpCatnapSpringView());

    List<CatnapWrappingView> catnapViews = new ArrayList<>(2);
    catnapViews.add(jsonCatnapSpringView());
    catnapViews.add(jsonpCatnapSpringView());

    CatnapViewResolver catnapViewResolver = new CatnapViewResolver();
    catnapViewResolver.setViews(catnapViews);

    List<ViewResolver> viewResolvers = new ArrayList<>(1);
    viewResolvers.add(catnapViewResolver);

    ContentNegotiatingViewResolver cnvr = new ContentNegotiatingViewResolver();
    cnvr.setContentNegotiationManager(mvcContentNegotiationManager());
    cnvr.setOrder(1);
    cnvr.setDefaultViews(defaultViews);
    cnvr.setViewResolvers(viewResolvers);

    return cnvr;
}
 

@Test
public void testViewResolutionWithContentNegotiation() throws Exception {
	loadBeanDefinitions("mvc-config-view-resolution-content-negotiation.xml");

	ViewResolverComposite compositeResolver = this.appContext.getBean(ViewResolverComposite.class);
	assertNotNull(compositeResolver);
	assertEquals(1, compositeResolver.getViewResolvers().size());
	assertEquals(Ordered.HIGHEST_PRECEDENCE, compositeResolver.getOrder());

	List<ViewResolver> resolvers = compositeResolver.getViewResolvers();
	assertEquals(ContentNegotiatingViewResolver.class, resolvers.get(0).getClass());
	ContentNegotiatingViewResolver cnvr = (ContentNegotiatingViewResolver) resolvers.get(0);
	assertEquals(6, cnvr.getViewResolvers().size());
	assertEquals(1, cnvr.getDefaultViews().size());
	assertTrue(cnvr.isUseNotAcceptableStatusCode());

	String beanName = "contentNegotiationManager";
	DirectFieldAccessor accessor = new DirectFieldAccessor(cnvr);
	ContentNegotiationManager manager = (ContentNegotiationManager) accessor.getPropertyValue(beanName);
	assertNotNull(manager);
	assertSame(manager, this.appContext.getBean(ContentNegotiationManager.class));
	assertSame(manager, this.appContext.getBean("mvcContentNegotiationManager"));
}
 

@Test
public void testContentNegotiationManager() throws Exception {
	loadBeanDefinitions("mvc-config-content-negotiation-manager.xml");

	RequestMappingHandlerMapping mapping = appContext.getBean(RequestMappingHandlerMapping.class);
	ContentNegotiationManager manager = mapping.getContentNegotiationManager();

	MockHttpServletRequest request = new MockHttpServletRequest("GET", "/foo.xml");
	NativeWebRequest webRequest = new ServletWebRequest(request);
	assertEquals(Collections.singletonList(MediaType.valueOf("application/rss+xml")),
			manager.resolveMediaTypes(webRequest));

	ViewResolverComposite compositeResolver = this.appContext.getBean(ViewResolverComposite.class);
	assertNotNull(compositeResolver);
	assertEquals("Actual: " + compositeResolver.getViewResolvers(), 1, compositeResolver.getViewResolvers().size());

	ViewResolver resolver = compositeResolver.getViewResolvers().get(0);
	assertEquals(ContentNegotiatingViewResolver.class, resolver.getClass());
	ContentNegotiatingViewResolver cnvr = (ContentNegotiatingViewResolver) resolver;
	assertSame(manager, cnvr.getContentNegotiationManager());
}
 

private BeanDefinition createContentNegotiatingViewResolver(Element resolverElement, ParserContext context) {
	RootBeanDefinition beanDef = new RootBeanDefinition(ContentNegotiatingViewResolver.class);
	beanDef.setSource(context.extractSource(resolverElement));
	beanDef.setRole(BeanDefinition.ROLE_INFRASTRUCTURE);
	MutablePropertyValues values = beanDef.getPropertyValues();

	List<Element> elements = DomUtils.getChildElementsByTagName(resolverElement, "default-views");
	if (!elements.isEmpty()) {
		ManagedList<Object> list = new ManagedList<>();
		for (Element element : DomUtils.getChildElementsByTagName(elements.get(0), "bean", "ref")) {
			list.add(context.getDelegate().parsePropertySubElement(element, null));
		}
		values.add("defaultViews", list);
	}
	if (resolverElement.hasAttribute("use-not-acceptable")) {
		values.add("useNotAcceptableStatusCode", resolverElement.getAttribute("use-not-acceptable"));
	}
	Object manager = MvcNamespaceUtils.getContentNegotiationManager(context);
	if (manager != null) {
		values.add("contentNegotiationManager", manager);
	}
	return beanDef;
}
 

private ContentNegotiatingViewResolver initContentNegotiatingViewResolver(View[] defaultViews) {
	// ContentNegotiatingResolver in the registry: elevate its precedence!
	this.order = (this.order != null ? this.order : Ordered.HIGHEST_PRECEDENCE);

	if (this.contentNegotiatingResolver != null) {
		if (!ObjectUtils.isEmpty(defaultViews) &&
				!CollectionUtils.isEmpty(this.contentNegotiatingResolver.getDefaultViews())) {
			List<View> views = new ArrayList<>(this.contentNegotiatingResolver.getDefaultViews());
			views.addAll(Arrays.asList(defaultViews));
			this.contentNegotiatingResolver.setDefaultViews(views);
		}
	}
	else {
		this.contentNegotiatingResolver = new ContentNegotiatingViewResolver();
		this.contentNegotiatingResolver.setDefaultViews(Arrays.asList(defaultViews));
		this.contentNegotiatingResolver.setViewResolvers(this.viewResolvers);
		if (this.contentNegotiationManager != null) {
			this.contentNegotiatingResolver.setContentNegotiationManager(this.contentNegotiationManager);
		}
	}
	return this.contentNegotiatingResolver;
}
 

@Bean
public ContentNegotiatingViewResolver viewResolver(ContentNegotiationManager cnManager) {
    ContentNegotiatingViewResolver cnvResolver = new ContentNegotiatingViewResolver();
    cnvResolver.setContentNegotiationManager(cnManager);
    List<ViewResolver> resolvers = new ArrayList<>();

    InternalResourceViewResolver bean = new InternalResourceViewResolver("/WEB-INF/views/",".jsp");
    ArticleRssFeedViewResolver articleRssFeedViewResolver = new ArticleRssFeedViewResolver();

    resolvers.add(bean);
    resolvers.add(articleRssFeedViewResolver);

    cnvResolver.setViewResolvers(resolvers);
    return cnvResolver;
}
 

@Bean
public ContentNegotiatingViewResolver contentNegotiatingViewResolver() {
    ContentNegotiatingViewResolver result = new ContentNegotiatingViewResolver();
    Map<String, String> mediaTypes = new HashMap<String, String>();
    mediaTypes.put("json", MediaType.APPLICATION_JSON_VALUE);
    result.setMediaTypes(mediaTypes);
    MappingJacksonJsonView jacksonView = new MappingJacksonJsonView();
    jacksonView.setExtractValueFromSingleKeyModel(true);
    Set<String> modelKeys = new HashSet<String>();
    modelKeys.add("events");
    modelKeys.add("event");
    jacksonView.setModelKeys(modelKeys);
    result.setDefaultViews(Collections.singletonList((View) jacksonView));
    return result;
}
 

@Test
public void testContentNegotiation() throws Exception {

	Jaxb2Marshaller marshaller = new Jaxb2Marshaller();
	marshaller.setClassesToBeBound(Person.class);

	List<View> viewList = new ArrayList<View>();
	viewList.add(new MappingJackson2JsonView());
	viewList.add(new MarshallingView(marshaller));

	ContentNegotiationManager manager = new ContentNegotiationManager(
			new HeaderContentNegotiationStrategy(), new FixedContentNegotiationStrategy(MediaType.TEXT_HTML));

	ContentNegotiatingViewResolver cnViewResolver = new ContentNegotiatingViewResolver();
	cnViewResolver.setDefaultViews(viewList);
	cnViewResolver.setContentNegotiationManager(manager);
	cnViewResolver.afterPropertiesSet();

	MockMvc mockMvc =
		standaloneSetup(new PersonController())
			.setViewResolvers(cnViewResolver, new InternalResourceViewResolver())
			.build();

	mockMvc.perform(get("/person/Corea"))
		.andExpect(status().isOk())
		.andExpect(model().size(1))
		.andExpect(model().attributeExists("person"))
		.andExpect(forwardedUrl("person/show"));

	mockMvc.perform(get("/person/Corea").accept(MediaType.APPLICATION_JSON))
		.andExpect(status().isOk())
		.andExpect(content().contentType(MediaType.APPLICATION_JSON))
		.andExpect(jsonPath("$.person.name").value("Corea"));

	mockMvc.perform(get("/person/Corea").accept(MediaType.APPLICATION_XML))
		.andExpect(status().isOk())
		.andExpect(content().contentType(MediaType.APPLICATION_XML))
		.andExpect(xpath("/person/name/text()").string(equalTo("Corea")));
}
 

@Test
public void contentNegotiationAddsDefaultViewRegistrations() {
	MappingJackson2JsonView view1 = new MappingJackson2JsonView();
	this.registry.enableContentNegotiation(view1);

	ContentNegotiatingViewResolver resolver1 = checkAndGetResolver(ContentNegotiatingViewResolver.class);
	assertEquals(Arrays.asList(view1), resolver1.getDefaultViews());

	MarshallingView view2 = new MarshallingView();
	this.registry.enableContentNegotiation(view2);

	ContentNegotiatingViewResolver resolver2 = checkAndGetResolver(ContentNegotiatingViewResolver.class);
	assertEquals(Arrays.asList(view1, view2), resolver2.getDefaultViews());
	assertSame(resolver1, resolver2);
}
 

@Test
public void contentNegotiation() {
	MappingJackson2JsonView view = new MappingJackson2JsonView();
	this.registry.enableContentNegotiation(view);
	ContentNegotiatingViewResolver resolver = checkAndGetResolver(ContentNegotiatingViewResolver.class);
	assertEquals(Arrays.asList(view), resolver.getDefaultViews());
	assertEquals(Ordered.HIGHEST_PRECEDENCE, this.registry.getOrder());
}
 

@Bean
public ContentNegotiatingViewResolver contentNegotiatingViewResolver() {
    ContentNegotiatingViewResolver result = new ContentNegotiatingViewResolver();
    Map<String, String> mediaTypes = new HashMap<String, String>();
    mediaTypes.put("json", MediaType.APPLICATION_JSON_VALUE);
    result.setMediaTypes(mediaTypes);
    MappingJacksonJsonView jacksonView = new MappingJacksonJsonView();
    jacksonView.setExtractValueFromSingleKeyModel(true);
    Set<String> modelKeys = new HashSet<String>();
    modelKeys.add("events");
    modelKeys.add("event");
    jacksonView.setModelKeys(modelKeys);
    result.setDefaultViews(Collections.singletonList((View) jacksonView));
    return result;
}
 

@Bean
public ContentNegotiatingViewResolver contentNegotiatingViewResolver() {
    ContentNegotiatingViewResolver result = new ContentNegotiatingViewResolver();
    Map<String, String> mediaTypes = new HashMap<String, String>();
    mediaTypes.put("json", MediaType.APPLICATION_JSON_VALUE);
    result.setMediaTypes(mediaTypes);
    MappingJacksonJsonView jacksonView = new MappingJacksonJsonView();
    jacksonView.setExtractValueFromSingleKeyModel(true);
    Set<String> modelKeys = new HashSet<String>();
    modelKeys.add("events");
    modelKeys.add("event");
    jacksonView.setModelKeys(modelKeys);
    result.setDefaultViews(Collections.singletonList((View) jacksonView));
    return result;
}
 

@Bean
public ContentNegotiatingViewResolver contentNegotiatingViewResolver() {
    ContentNegotiatingViewResolver result = new ContentNegotiatingViewResolver();
    Map<String, String> mediaTypes = new HashMap<String, String>();
    mediaTypes.put("json", MediaType.APPLICATION_JSON_VALUE);
    result.setMediaTypes(mediaTypes);
    MappingJacksonJsonView jacksonView = new MappingJacksonJsonView();
    jacksonView.setExtractValueFromSingleKeyModel(true);
    Set<String> modelKeys = new HashSet<String>();
    modelKeys.add("events");
    modelKeys.add("event");
    jacksonView.setModelKeys(modelKeys);
    result.setDefaultViews(Collections.singletonList((View) jacksonView));
    return result;
}
 

@Test
public void contentNegotiationAddsDefaultViewRegistrations() {
	MappingJackson2JsonView view1 = new MappingJackson2JsonView();
	this.registry.enableContentNegotiation(view1);

	ContentNegotiatingViewResolver resolver1 = checkAndGetResolver(ContentNegotiatingViewResolver.class);
	assertEquals(Arrays.asList(view1), resolver1.getDefaultViews());

	MarshallingView view2 = new MarshallingView();
	this.registry.enableContentNegotiation(view2);

	ContentNegotiatingViewResolver resolver2 = checkAndGetResolver(ContentNegotiatingViewResolver.class);
	assertEquals(Arrays.asList(view1, view2), resolver2.getDefaultViews());
	assertSame(resolver1, resolver2);
}
 

@Test
public void contentNegotiation() {
	MappingJackson2JsonView view = new MappingJackson2JsonView();
	this.registry.enableContentNegotiation(view);
	ContentNegotiatingViewResolver resolver = checkAndGetResolver(ContentNegotiatingViewResolver.class);
	assertEquals(Arrays.asList(view), resolver.getDefaultViews());
	assertEquals(Ordered.HIGHEST_PRECEDENCE, this.registry.getOrder());
}
 

@Bean
public ViewResolver cnViewResolver(ContentNegotiationManager cnm) {
	/*
	 * 内容协商视图解析器
	 * 1．确定请求的媒体类型；
	 * 		首先查看URL的文件扩展名，如果扩展名是“.json”，那么所需的内容类型必须是application/json
	 * 		没找到扩展名，则从请求中的Accept头部信息中找
	 * 		都没有，ContentNegotiatingViewResolver将会使用“/”作为默认的内容类型，
	 * 			这就意味着客户端必须要接收服务器发送的任何形式的表述
	 * 2．找到适合请求媒体类型的最佳视图
	 */
	ContentNegotiatingViewResolver cnvr = new ContentNegotiatingViewResolver();
	cnvr.setContentNegotiationManager(cnm);
	return cnvr;
}
 

@Test
public void contentNegotiationAddsDefaultViewRegistrations() {
	MappingJackson2JsonView view1 = new MappingJackson2JsonView();
	this.registry.enableContentNegotiation(view1);

	ContentNegotiatingViewResolver resolver1 = checkAndGetResolver(ContentNegotiatingViewResolver.class);
	assertEquals(Arrays.asList(view1), resolver1.getDefaultViews());

	MarshallingView view2 = new MarshallingView();
	this.registry.enableContentNegotiation(view2);

	ContentNegotiatingViewResolver resolver2 = checkAndGetResolver(ContentNegotiatingViewResolver.class);
	assertEquals(Arrays.asList(view1, view2), resolver2.getDefaultViews());
	assertSame(resolver1, resolver2);
}
 

@Test
public void contentNegotiation() {
	MappingJackson2JsonView view = new MappingJackson2JsonView();
	this.registry.enableContentNegotiation(view);
	ContentNegotiatingViewResolver resolver = checkAndGetResolver(ContentNegotiatingViewResolver.class);
	assertEquals(Arrays.asList(view), resolver.getDefaultViews());
	assertEquals(Ordered.HIGHEST_PRECEDENCE, this.registry.getOrder());
}