下面列出了怎么用org.springframework.web.servlet.handler.HandlerExceptionResolverComposite的API类实例代码及写法，或者点击链接到github查看源代码。
@Test
public void customArgumentResolvers() {
ApplicationContext context = initContext(CustomArgumentResolverConfig.class);
RequestMappingHandlerAdapter adapter = context.getBean(RequestMappingHandlerAdapter.class);
HandlerExceptionResolverComposite composite = context.getBean(HandlerExceptionResolverComposite.class);
assertNotNull(adapter);
assertEquals(1, adapter.getCustomArgumentResolvers().size());
assertEquals(TestArgumentResolver.class, adapter.getCustomArgumentResolvers().get(0).getClass());
assertEquals(1, adapter.getCustomReturnValueHandlers().size());
assertEquals(TestReturnValueHandler.class, adapter.getCustomReturnValueHandlers().get(0).getClass());
assertNotNull(composite);
assertEquals(3, composite.getExceptionResolvers().size());
assertEquals(ExceptionHandlerExceptionResolver.class, composite.getExceptionResolvers().get(0).getClass());
ExceptionHandlerExceptionResolver resolver =
(ExceptionHandlerExceptionResolver) composite.getExceptionResolvers().get(0);
assertEquals(1, resolver.getCustomArgumentResolvers().size());
assertEquals(TestArgumentResolver.class, resolver.getCustomArgumentResolvers().get(0).getClass());
assertEquals(1, resolver.getCustomReturnValueHandlers().size());
assertEquals(TestReturnValueHandler.class, resolver.getCustomReturnValueHandlers().get(0).getClass());
}
@Test
public void configureExceptionResolvers() throws Exception {
List<WebMvcConfigurer> configurers = new ArrayList<>();
configurers.add(new WebMvcConfigurer() {
@Override
public void configureHandlerExceptionResolvers(List<HandlerExceptionResolver> exceptionResolvers) {
exceptionResolvers.add(new DefaultHandlerExceptionResolver());
}
});
delegatingConfig.setConfigurers(configurers);
HandlerExceptionResolverComposite composite =
(HandlerExceptionResolverComposite) delegatingConfig
.handlerExceptionResolver(delegatingConfig.mvcContentNegotiationManager());
assertEquals("Only one custom converter is expected", 1, composite.getExceptionResolvers().size());
}
/**
* 动态添加异常切面
* @param handlerExceptionResolver HandlerExceptionResolver
* @param beanFactory BeanFactory
* @param beanName 异常拦截处理器bean名
*/
public static void addDynamicExceptionAdvice(HandlerExceptionResolver handlerExceptionResolver, BeanFactory beanFactory, String beanName) {
if (handlerExceptionResolver instanceof HandlerExceptionResolverComposite) {
List<HandlerExceptionResolver> exceptionResolvers = ((HandlerExceptionResolverComposite) handlerExceptionResolver).getExceptionResolvers();
for (HandlerExceptionResolver exceptionResolver : exceptionResolvers) {
if (exceptionResolver instanceof ExceptionHandlerExceptionResolver) {
// TODO <mark> 由于使用底层API, 这个exceptionHandlerAdviceCache属性在未来版本中可能会改
Map<ControllerAdviceBean, ExceptionHandlerMethodResolver> resolverMap = ReflectUtil.invokeFieldPath(exceptionResolver, "exceptionHandlerAdviceCache");
if (resolverMap == null) {
resolverMap = new HashMap<>(2);
}
// 仿Spring MVC源码创建advice
ControllerAdviceBean adviceBean = new ControllerAdviceBean(beanName, ApplicationContextHolder.get(), null);
Class<?> beanType = adviceBean.getBeanType();
if (beanType == null) {
throw new IllegalStateException("SpringMvcPolyfill find unresolvable type for ControllerAdviceBean: " + adviceBean);
}
ExceptionHandlerMethodResolver resolver = new ExceptionHandlerMethodResolver(beanType);
if (resolver.hasExceptionMappings()) {
resolverMap.put(adviceBean, resolver);
}
break;
}
}
}
}
@Test
public void customArgumentResolvers() {
ApplicationContext context = initContext(CustomArgumentResolverConfig.class);
RequestMappingHandlerAdapter adapter = context.getBean(RequestMappingHandlerAdapter.class);
HandlerExceptionResolverComposite composite = context.getBean(HandlerExceptionResolverComposite.class);
assertNotNull(adapter);
assertEquals(1, adapter.getCustomArgumentResolvers().size());
assertEquals(TestArgumentResolver.class, adapter.getCustomArgumentResolvers().get(0).getClass());
assertEquals(1, adapter.getCustomReturnValueHandlers().size());
assertEquals(TestReturnValueHandler.class, adapter.getCustomReturnValueHandlers().get(0).getClass());
assertNotNull(composite);
assertEquals(3, composite.getExceptionResolvers().size());
assertEquals(ExceptionHandlerExceptionResolver.class, composite.getExceptionResolvers().get(0).getClass());
ExceptionHandlerExceptionResolver resolver =
(ExceptionHandlerExceptionResolver) composite.getExceptionResolvers().get(0);
assertEquals(1, resolver.getCustomArgumentResolvers().size());
assertEquals(TestArgumentResolver.class, resolver.getCustomArgumentResolvers().get(0).getClass());
assertEquals(1, resolver.getCustomReturnValueHandlers().size());
assertEquals(TestReturnValueHandler.class, resolver.getCustomReturnValueHandlers().get(0).getClass());
}
/**
* Returns a {@link HandlerExceptionResolverComposite} containing a list of exception
* resolvers obtained either through {@link #configureHandlerExceptionResolvers} or
* through {@link #addDefaultHandlerExceptionResolvers}.
* <p><strong>Note:</strong> This method cannot be made final due to CGLIB constraints.
* Rather than overriding it, consider overriding {@link #configureHandlerExceptionResolvers}
* which allows for providing a list of resolvers.
*/
@Bean
public HandlerExceptionResolver handlerExceptionResolver(
ContentNegotiationManager mvcContentNegotiationManager) {
List<HandlerExceptionResolver> exceptionResolvers = new ArrayList<>();
configureHandlerExceptionResolvers(exceptionResolvers);
if (exceptionResolvers.isEmpty()) {
addDefaultHandlerExceptionResolvers(exceptionResolvers, mvcContentNegotiationManager);
}
extendHandlerExceptionResolvers(exceptionResolvers);
HandlerExceptionResolverComposite composite = new HandlerExceptionResolverComposite();
composite.setOrder(0);
composite.setExceptionResolvers(exceptionResolvers);
return composite;
}
@Test
public void exceptionResolvers() throws Exception {
List<HandlerExceptionResolver> resolvers = ((HandlerExceptionResolverComposite)
this.config.handlerExceptionResolver(null)).getExceptionResolvers();
assertEquals(2, resolvers.size());
assertEquals(ResponseStatusExceptionResolver.class, resolvers.get(0).getClass());
assertEquals(SimpleMappingExceptionResolver.class, resolvers.get(1).getClass());
}
@Test
@SuppressWarnings("unchecked")
public void handlerExceptionResolver() throws Exception {
ApplicationContext context = initContext(WebConfig.class);
HandlerExceptionResolverComposite compositeResolver =
context.getBean("handlerExceptionResolver", HandlerExceptionResolverComposite.class);
assertEquals(0, compositeResolver.getOrder());
List<HandlerExceptionResolver> expectedResolvers = compositeResolver.getExceptionResolvers();
assertEquals(ExceptionHandlerExceptionResolver.class, expectedResolvers.get(0).getClass());
assertEquals(ResponseStatusExceptionResolver.class, expectedResolvers.get(1).getClass());
assertEquals(DefaultHandlerExceptionResolver.class, expectedResolvers.get(2).getClass());
ExceptionHandlerExceptionResolver eher = (ExceptionHandlerExceptionResolver) expectedResolvers.get(0);
assertNotNull(eher.getApplicationContext());
DirectFieldAccessor fieldAccessor = new DirectFieldAccessor(eher);
List<Object> interceptors = (List<Object>) fieldAccessor.getPropertyValue("responseBodyAdvice");
assertEquals(1, interceptors.size());
assertEquals(JsonViewResponseBodyAdvice.class, interceptors.get(0).getClass());
LocaleContextHolder.setLocale(Locale.ENGLISH);
try {
ResponseStatusExceptionResolver rser = (ResponseStatusExceptionResolver) expectedResolvers.get(1);
MockHttpServletRequest request = new MockHttpServletRequest("GET", "/");
MockHttpServletResponse response = new MockHttpServletResponse();
rser.resolveException(request, response, context.getBean(TestController.class), new UserAlreadyExistsException());
assertEquals("User already exists!", response.getErrorMessage());
}
finally {
LocaleContextHolder.resetLocaleContext();
}
}
/**
* 动态添加消息体响应切面
* @param returnValueHandlers 响应处理器列表（需要注入 {@link org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter#getReturnValueHandlers()}）
* @param handlerExceptionResolver 异常处理解析器（需要注入 {@link org.springframework.web.servlet.HandlerExceptionResolver}）
* @param responseBodyAdvice ResponseBodyAdvice
*/
public static void addDynamicResponseBodyAdvice(List<HandlerMethodReturnValueHandler> returnValueHandlers, HandlerExceptionResolver handlerExceptionResolver, ResponseBodyAdvice<?> responseBodyAdvice) {
if (CollectionUtils.isEmpty(returnValueHandlers)) {
return;
}
// 下面这行添加不起作用，由于内部构建已经完成
// adapter.setResponseBodyAdvice(Collections.singletonList(responseBodyAdvice));
for (HandlerMethodReturnValueHandler returnValueHandler : returnValueHandlers) {
// 只有AbstractMessageConverterMethodArgumentResolver继承类型（主要是HttpEntityMethodProcessor、RequestResponseBodyMethodProcessor）有Advice Chain
if (returnValueHandler instanceof AbstractMessageConverterMethodArgumentResolver) {
// TODO <mark> 由于使用底层API, 这个advice.responseBodyAdvice属性在未来版本中可能会改
List<Object> advices = ReflectUtil.invokeFieldPath(returnValueHandler, "advice.responseBodyAdvice");
if (CollectionUtils.isEmpty(advices)) {
continue;
}
advices.add(responseBodyAdvice);
}
}
// 动态添加到异常处理（因为源码流程中的异常处理是新加载的HandlerExceptionResolver，与正常响应处理不是同个处理集）
if (handlerExceptionResolver instanceof HandlerExceptionResolverComposite) {
// SpringMVC默认为注册HandlerExceptionResolverComposite的Bean
List<HandlerExceptionResolver> exceptionResolvers = ((HandlerExceptionResolverComposite) handlerExceptionResolver).getExceptionResolvers();
if (CollectionUtils.isEmpty(exceptionResolvers)) {
return;
}
for (HandlerExceptionResolver exceptionResolver : exceptionResolvers) {
if (exceptionResolver instanceof ExceptionHandlerExceptionResolver) {
HandlerMethodReturnValueHandlerComposite returnValueHandlerComposite = ((ExceptionHandlerExceptionResolver) exceptionResolver).getReturnValueHandlers();
if (returnValueHandlerComposite == null) {
return;
}
SpringMvcPolyfill.addDynamicResponseBodyAdvice(returnValueHandlerComposite.getHandlers(), null, responseBodyAdvice);
}
}
}
}
/**
* Returns a {@link HandlerExceptionResolverComposite} containing a list of exception
* resolvers obtained either through {@link #configureHandlerExceptionResolvers} or
* through {@link #addDefaultHandlerExceptionResolvers}.
* <p><strong>Note:</strong> This method cannot be made final due to CGLIB constraints.
* Rather than overriding it, consider overriding {@link #configureHandlerExceptionResolvers}
* which allows for providing a list of resolvers.
*/
@Bean
public HandlerExceptionResolver handlerExceptionResolver() {
List<HandlerExceptionResolver> exceptionResolvers = new ArrayList<>();
configureHandlerExceptionResolvers(exceptionResolvers);
if (exceptionResolvers.isEmpty()) {
addDefaultHandlerExceptionResolvers(exceptionResolvers);
}
extendHandlerExceptionResolvers(exceptionResolvers);
HandlerExceptionResolverComposite composite = new HandlerExceptionResolverComposite();
composite.setOrder(0);
composite.setExceptionResolvers(exceptionResolvers);
return composite;
}
@Test
public void exceptionResolvers() throws Exception {
List<HandlerExceptionResolver> resolvers = ((HandlerExceptionResolverComposite)
this.config.handlerExceptionResolver()).getExceptionResolvers();
assertEquals(2, resolvers.size());
assertEquals(ResponseStatusExceptionResolver.class, resolvers.get(0).getClass());
assertEquals(SimpleMappingExceptionResolver.class, resolvers.get(1).getClass());
}
@Test
@SuppressWarnings("unchecked")
public void handlerExceptionResolver() throws Exception {
ApplicationContext context = initContext(WebConfig.class);
HandlerExceptionResolverComposite compositeResolver =
context.getBean("handlerExceptionResolver", HandlerExceptionResolverComposite.class);
assertEquals(0, compositeResolver.getOrder());
List<HandlerExceptionResolver> expectedResolvers = compositeResolver.getExceptionResolvers();
assertEquals(ExceptionHandlerExceptionResolver.class, expectedResolvers.get(0).getClass());
assertEquals(ResponseStatusExceptionResolver.class, expectedResolvers.get(1).getClass());
assertEquals(DefaultHandlerExceptionResolver.class, expectedResolvers.get(2).getClass());
ExceptionHandlerExceptionResolver eher = (ExceptionHandlerExceptionResolver) expectedResolvers.get(0);
assertNotNull(eher.getApplicationContext());
DirectFieldAccessor fieldAccessor = new DirectFieldAccessor(eher);
List<Object> interceptors = (List<Object>) fieldAccessor.getPropertyValue("responseBodyAdvice");
assertEquals(1, interceptors.size());
assertEquals(JsonViewResponseBodyAdvice.class, interceptors.get(0).getClass());
LocaleContextHolder.setLocale(Locale.ENGLISH);
try {
ResponseStatusExceptionResolver rser = (ResponseStatusExceptionResolver) expectedResolvers.get(1);
MockHttpServletRequest request = new MockHttpServletRequest("GET", "/");
MockHttpServletResponse response = new MockHttpServletResponse();
rser.resolveException(request, response, context.getBean(TestController.class), new UserAlreadyExistsException());
assertEquals("User already exists!", response.getErrorMessage());
}
finally {
LocaleContextHolder.resetLocaleContext();
}
}
@Test
public void configureExceptionResolvers() throws Exception {
List<WebMvcConfigurer> configurers = new ArrayList<>();
configurers.add(new WebMvcConfigurer() {
@Override
public void configureHandlerExceptionResolvers(List<HandlerExceptionResolver> exceptionResolvers) {
exceptionResolvers.add(new DefaultHandlerExceptionResolver());
}
});
delegatingConfig.setConfigurers(configurers);
HandlerExceptionResolverComposite composite =
(HandlerExceptionResolverComposite) delegatingConfig.handlerExceptionResolver();
assertEquals("Only one custom converter is expected", 1, composite.getExceptionResolvers().size());
}
/**
* Returns a {@link HandlerExceptionResolverComposite} containing a list
* of exception resolvers obtained either through
* {@link #configureHandlerExceptionResolvers(List)} or through
* {@link #addDefaultHandlerExceptionResolvers(List)}.
* <p><strong>Note:</strong> This method cannot be made final due to CGLib
* constraints. Rather than overriding it, consider overriding
* {@link #configureHandlerExceptionResolvers(List)}, which allows
* providing a list of resolvers.
*/
@Bean
public HandlerExceptionResolver handlerExceptionResolver() {
List<HandlerExceptionResolver> exceptionResolvers = new ArrayList<HandlerExceptionResolver>();
configureHandlerExceptionResolvers(exceptionResolvers);
if (exceptionResolvers.isEmpty()) {
addDefaultHandlerExceptionResolvers(exceptionResolvers);
}
extendHandlerExceptionResolvers(exceptionResolvers);
HandlerExceptionResolverComposite composite = new HandlerExceptionResolverComposite();
composite.setOrder(0);
composite.setExceptionResolvers(exceptionResolvers);
return composite;
}
/**
* Returns a {@link HandlerExceptionResolverComposite} containing a list
* of exception resolvers obtained either through
* {@link #configureHandlerExceptionResolvers(List)} or through
* {@link #addDefaultHandlerExceptionResolvers(List)}.
* <p><strong>Note:</strong> This method cannot be made final due to CGLib
* constraints. Rather than overriding it, consider overriding
* {@link #configureHandlerExceptionResolvers(List)}, which allows
* providing a list of resolvers.
*/
@Bean
public HandlerExceptionResolver handlerExceptionResolver() {
List<HandlerExceptionResolver> exceptionResolvers = new ArrayList<HandlerExceptionResolver>();
configureHandlerExceptionResolvers(exceptionResolvers);
if (exceptionResolvers.isEmpty()) {
addDefaultHandlerExceptionResolvers(exceptionResolvers);
}
HandlerExceptionResolverComposite composite = new HandlerExceptionResolverComposite();
composite.setOrder(0);
composite.setExceptionResolvers(exceptionResolvers);
return composite;
}
@Test
@SuppressWarnings("unchecked")
public void handlerExceptionResolver() throws Exception {
ApplicationContext context = initContext(WebConfig.class);
HandlerExceptionResolverComposite compositeResolver =
context.getBean("handlerExceptionResolver", HandlerExceptionResolverComposite.class);
assertEquals(0, compositeResolver.getOrder());
List<HandlerExceptionResolver> expectedResolvers = compositeResolver.getExceptionResolvers();
assertEquals(ExceptionHandlerExceptionResolver.class, expectedResolvers.get(0).getClass());
assertEquals(ResponseStatusExceptionResolver.class, expectedResolvers.get(1).getClass());
assertEquals(DefaultHandlerExceptionResolver.class, expectedResolvers.get(2).getClass());
ExceptionHandlerExceptionResolver eher = (ExceptionHandlerExceptionResolver) expectedResolvers.get(0);
assertNotNull(eher.getApplicationContext());
DirectFieldAccessor fieldAccessor = new DirectFieldAccessor(eher);
List<Object> interceptors = (List<Object>) fieldAccessor.getPropertyValue("responseBodyAdvice");
assertEquals(1, interceptors.size());
assertEquals(JsonViewResponseBodyAdvice.class, interceptors.get(0).getClass());
LocaleContextHolder.setLocale(Locale.ENGLISH);
try {
ResponseStatusExceptionResolver rser = (ResponseStatusExceptionResolver) expectedResolvers.get(1);
MockHttpServletRequest request = new MockHttpServletRequest("GET", "/");
MockHttpServletResponse response = new MockHttpServletResponse();
rser.resolveException(request, response, context.getBean(TestController.class), new UserAlreadyExistsException());
assertEquals("User already exists!", response.getErrorMessage());
}
finally {
LocaleContextHolder.resetLocaleContext();
}
}
@Test
public void configureExceptionResolvers() throws Exception {
List<WebMvcConfigurer> configurers = new ArrayList<WebMvcConfigurer>();
configurers.add(new WebMvcConfigurerAdapter() {
@Override
public void configureHandlerExceptionResolvers(List<HandlerExceptionResolver> exceptionResolvers) {
exceptionResolvers.add(new DefaultHandlerExceptionResolver());
}
});
delegatingConfig.setConfigurers(configurers);
HandlerExceptionResolverComposite composite =
(HandlerExceptionResolverComposite) delegatingConfig.handlerExceptionResolver();
assertEquals("Only one custom converter is expected", 1, composite.getExceptionResolvers().size());
}
@Test
public void exceptionResolvers() throws Exception {
HandlerExceptionResolver exceptionResolver = this.config.handlerExceptionResolver();
assertEquals(1, ((HandlerExceptionResolverComposite) exceptionResolver).getExceptionResolvers().size());
}