下面列出了org.springframework.core.MethodParameter#getNestedParameterType ( ) 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。
@Override
public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest nativeWebRequest, WebDataBinderFactory binderFactory) throws Exception {
RequestJsonToPo parameterAnnotation = parameter.getParameterAnnotation(RequestJsonToPo.class);
Objects.requireNonNull(parameterAnnotation);
String value = parameterAnnotation.value();
Class<?> clazz = parameter.getNestedParameterType();
String jsonParameter = nativeWebRequest.getParameter(value);
if (jsonParameter == null) {
if (clazz.isAssignableFrom(List.class)) {
return Lists.newArrayList();
}
return clazz.newInstance();
}
jsonParameter = URLDecoder.decode(jsonParameter, StandardCharsets.UTF_8.name());
if (clazz.isAssignableFrom(List.class) || clazz.isAssignableFrom(ArrayList.class)) {
String typeName = ((sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl) parameter.getGenericParameterType()).getActualTypeArguments()[0].getTypeName();
Class<?> aClass = Class.forName(typeName);
return JsonUtil.toList(jsonParameter, aClass);
} else {
return JsonUtil.toObject(jsonParameter, clazz);
}
}
@Override
public void contributeMethodArgument(MethodParameter parameter, Object value, UriComponentsBuilder builder, Map<String, Object> uriVariables, ConversionService conversionService) {
Class<?> paramType = parameter.getNestedParameterType();
if (Map.class.isAssignableFrom(paramType)) {
return;
}
WxApiParam wxApiParam = parameter.getParameterAnnotation(WxApiParam.class);
String name = (wxApiParam == null || StringUtils.isEmpty(wxApiParam.name()) ? parameter.getParameterName() : wxApiParam.name());
WxAppAssert.notNull(name, "请添加编译器的-parameter或者为参数添加注解名称");
if (value == null) {
if (wxApiParam != null) {
if (!wxApiParam.required() || !wxApiParam.defaultValue().equals(ValueConstants.DEFAULT_NONE)) {
return;
}
}
builder.queryParam(name);
} else if (value instanceof Collection) {
for (Object element : (Collection<?>) value) {
element = formatUriValue(conversionService, TypeDescriptor.nested(parameter, 1), element);
builder.queryParam(name, element);
}
} else {
builder.queryParam(name, formatUriValue(conversionService, new TypeDescriptor(parameter), value));
}
}
@Override
protected Object resolveNamedValue(String name, MethodParameter parameter, ServerWebExchange exchange) {
HttpCookie cookie = exchange.getRequest().getCookies().getFirst(name);
Class<?> paramType = parameter.getNestedParameterType();
if (HttpCookie.class.isAssignableFrom(paramType)) {
return cookie;
}
return (cookie != null ? cookie.getValue() : null);
}
/**
* Evaluate the {@code Predicate} on the method parameter type if it has the
* given annotation, nesting within {@link java.util.Optional} if necessary,
* but raise an {@code IllegalStateException} if the same matches the generic
* type within a reactive type wrapper.
*/
protected <A extends Annotation> boolean checkAnnotatedParamNoReactiveWrapper(
MethodParameter parameter, Class<A> annotationType, BiPredicate<A, Class<?>> typePredicate) {
A annotation = parameter.getParameterAnnotation(annotationType);
if (annotation == null) {
return false;
}
parameter = parameter.nestedIfOptional();
Class<?> type = parameter.getNestedParameterType();
ReactiveAdapter adapter = getAdapterRegistry().getAdapter(type);
if (adapter != null) {
assertHasValues(adapter, parameter);
parameter = parameter.nested();
type = parameter.getNestedParameterType();
}
if (typePredicate.test(annotation, type)) {
if (adapter == null) {
return true;
}
throw buildReactiveWrapperException(parameter);
}
return false;
}
@Nullable
private static Class<?> getCollectionParameterType(MethodParameter methodParam) {
Class<?> paramType = methodParam.getNestedParameterType();
if (Collection.class == paramType || List.class.isAssignableFrom(paramType)){
Class<?> valueType = ResolvableType.forMethodParameter(methodParam).asCollection().resolveGeneric();
if (valueType != null) {
return valueType;
}
}
return null;
}
@Override
public void contributeMethodArgument(MethodParameter parameter, @Nullable Object value,
UriComponentsBuilder builder, Map<String, Object> uriVariables, ConversionService conversionService) {
Class<?> paramType = parameter.getNestedParameterType();
if (Map.class.isAssignableFrom(paramType) || MultipartFile.class == paramType || Part.class == paramType) {
return;
}
RequestParam requestParam = parameter.getParameterAnnotation(RequestParam.class);
String name = (requestParam != null && StringUtils.hasLength(requestParam.name()) ?
requestParam.name() : parameter.getParameterName());
Assert.state(name != null, "Unresolvable parameter name");
parameter = parameter.nestedIfOptional();
if (value instanceof Optional) {
value = ((Optional<?>) value).orElse(null);
}
if (value == null) {
if (requestParam != null &&
(!requestParam.required() || !requestParam.defaultValue().equals(ValueConstants.DEFAULT_NONE))) {
return;
}
builder.queryParam(name);
}
else if (value instanceof Collection) {
for (Object element : (Collection<?>) value) {
element = formatUriValue(conversionService, TypeDescriptor.nested(parameter, 1), element);
builder.queryParam(name, element);
}
}
else {
builder.queryParam(name, formatUriValue(conversionService, new TypeDescriptor(parameter), value));
}
}
@Override
protected Object resolveNamedValue(String name, MethodParameter parameter, ServerWebExchange exchange) {
HttpCookie cookie = exchange.getRequest().getCookies().getFirst(name);
Class<?> paramType = parameter.getNestedParameterType();
if (HttpCookie.class.isAssignableFrom(paramType)) {
return cookie;
}
return (cookie != null ? cookie.getValue() : null);
}
/**
* Evaluate the {@code Predicate} on the method parameter type if it has the
* given annotation, nesting within {@link java.util.Optional} if necessary,
* but raise an {@code IllegalStateException} if the same matches the generic
* type within a reactive type wrapper.
*/
protected <A extends Annotation> boolean checkAnnotatedParamNoReactiveWrapper(
MethodParameter parameter, Class<A> annotationType, BiPredicate<A, Class<?>> typePredicate) {
A annotation = parameter.getParameterAnnotation(annotationType);
if (annotation == null) {
return false;
}
parameter = parameter.nestedIfOptional();
Class<?> type = parameter.getNestedParameterType();
ReactiveAdapter adapter = getAdapterRegistry().getAdapter(type);
if (adapter != null) {
assertHasValues(adapter, parameter);
parameter = parameter.nested();
type = parameter.getNestedParameterType();
}
if (typePredicate.test(annotation, type)) {
if (adapter == null) {
return true;
}
throw buildReactiveWrapperException(parameter);
}
return false;
}
@Nullable
private static Class<?> getCollectionParameterType(MethodParameter methodParam) {
Class<?> paramType = methodParam.getNestedParameterType();
if (Collection.class == paramType || List.class.isAssignableFrom(paramType)){
Class<?> valueType = ResolvableType.forMethodParameter(methodParam).asCollection().resolveGeneric();
if (valueType != null) {
return valueType;
}
}
return null;
}
/**
* Extension point to create the model attribute if not found in the model,
* with subsequent parameter binding through bean properties (unless suppressed).
* <p>The default implementation typically uses the unique public no-arg constructor
* if available but also handles a "primary constructor" approach for data classes:
* It understands the JavaBeans {@link ConstructorProperties} annotation as well as
* runtime-retained parameter names in the bytecode, associating request parameters
* with constructor arguments by name. If no such constructor is found, the default
* constructor will be used (even if not public), assuming subsequent bean property
* bindings through setter methods.
* @param attributeName the name of the attribute (never {@code null})
* @param parameter the method parameter declaration
* @param binderFactory for creating WebDataBinder instance
* @param webRequest the current request
* @return the created model attribute (never {@code null})
* @throws BindException in case of constructor argument binding failure
* @throws Exception in case of constructor invocation failure
* @see #constructAttribute(Constructor, String, MethodParameter, WebDataBinderFactory, NativeWebRequest)
* @see BeanUtils#findPrimaryConstructor(Class)
*/
protected Object createAttribute(String attributeName, MethodParameter parameter,
WebDataBinderFactory binderFactory, NativeWebRequest webRequest) throws Exception {
MethodParameter nestedParameter = parameter.nestedIfOptional();
Class<?> clazz = nestedParameter.getNestedParameterType();
Constructor<?> ctor = BeanUtils.findPrimaryConstructor(clazz);
if (ctor == null) {
Constructor<?>[] ctors = clazz.getConstructors();
if (ctors.length == 1) {
ctor = ctors[0];
}
else {
try {
ctor = clazz.getDeclaredConstructor();
}
catch (NoSuchMethodException ex) {
throw new IllegalStateException("No primary or default constructor found for " + clazz, ex);
}
}
}
Object attribute = constructAttribute(ctor, attributeName, parameter, binderFactory, webRequest);
if (parameter != nestedParameter) {
attribute = Optional.of(attribute);
}
return attribute;
}
@Override
public void contributeMethodArgument(MethodParameter parameter, @Nullable Object value,
UriComponentsBuilder builder, Map<String, Object> uriVariables, ConversionService conversionService) {
Class<?> paramType = parameter.getNestedParameterType();
if (Map.class.isAssignableFrom(paramType) || MultipartFile.class == paramType || Part.class == paramType) {
return;
}
RequestParam requestParam = parameter.getParameterAnnotation(RequestParam.class);
String name = (requestParam == null || StringUtils.isEmpty(requestParam.name()) ?
parameter.getParameterName() : requestParam.name());
Assert.state(name != null, "Unresolvable parameter name");
if (value == null) {
if (requestParam != null &&
(!requestParam.required() || !requestParam.defaultValue().equals(ValueConstants.DEFAULT_NONE))) {
return;
}
builder.queryParam(name);
}
else if (value instanceof Collection) {
for (Object element : (Collection<?>) value) {
element = formatUriValue(conversionService, TypeDescriptor.nested(parameter, 1), element);
builder.queryParam(name, element);
}
}
else {
builder.queryParam(name, formatUriValue(conversionService, new TypeDescriptor(parameter), value));
}
}
public static boolean isMultipartArgument(MethodParameter parameter) {
Class<?> paramType = parameter.getNestedParameterType();
return (MultipartFile.class == paramType ||
isMultipartFileCollection(parameter) || isMultipartFileArray(parameter) ||
(servletPartClass != null && (servletPartClass == paramType ||
isPartCollection(parameter) || isPartArray(parameter))));
}
private static Class<?> getCollectionParameterType(MethodParameter methodParam) {
Class<?> paramType = methodParam.getNestedParameterType();
if (Collection.class == paramType || List.class.isAssignableFrom(paramType)){
Class<?> valueType = ResolvableType.forMethodParameter(methodParam).asCollection().resolveGeneric();
if (valueType != null) {
return valueType;
}
}
return null;
}
@Override
public void contributeMethodArgument(MethodParameter parameter, Object value,
UriComponentsBuilder builder, Map<String, Object> uriVariables, ConversionService conversionService) {
Class<?> paramType = parameter.getNestedParameterType();
if (Map.class.isAssignableFrom(paramType) || MultipartFile.class == paramType ||
"javax.servlet.http.Part".equals(paramType.getName())) {
return;
}
RequestParam requestParam = parameter.getParameterAnnotation(RequestParam.class);
String name = (requestParam == null || StringUtils.isEmpty(requestParam.name()) ?
parameter.getParameterName() : requestParam.name());
if (value == null) {
if (requestParam != null) {
if (!requestParam.required() || !requestParam.defaultValue().equals(ValueConstants.DEFAULT_NONE)) {
return;
}
}
builder.queryParam(name);
}
else if (value instanceof Collection) {
for (Object element : (Collection<?>) value) {
element = formatUriValue(conversionService, TypeDescriptor.nested(parameter, 1), element);
builder.queryParam(name, element);
}
}
else {
builder.queryParam(name, formatUriValue(conversionService, new TypeDescriptor(parameter), value));
}
}
public static boolean isMultipartArgument(MethodParameter parameter) {
Class<?> paramType = parameter.getNestedParameterType();
return (MultipartFile.class == paramType ||
isMultipartFileCollection(parameter) || isMultipartFileArray(parameter) ||
(Part.class == paramType || isPartCollection(parameter) || isPartArray(parameter)));
}
@Nullable
public static Object resolveMultipartArgument(String name, MethodParameter parameter, HttpServletRequest request)
throws Exception {
MultipartHttpServletRequest multipartRequest =
WebUtils.getNativeRequest(request, MultipartHttpServletRequest.class);
boolean isMultipart = (multipartRequest != null || isMultipartContent(request));
if (MultipartFile.class == parameter.getNestedParameterType()) {
if (multipartRequest == null && isMultipart) {
multipartRequest = new StandardMultipartHttpServletRequest(request);
}
return (multipartRequest != null ? multipartRequest.getFile(name) : null);
}
else if (isMultipartFileCollection(parameter)) {
if (multipartRequest == null && isMultipart) {
multipartRequest = new StandardMultipartHttpServletRequest(request);
}
return (multipartRequest != null ? multipartRequest.getFiles(name) : null);
}
else if (isMultipartFileArray(parameter)) {
if (multipartRequest == null && isMultipart) {
multipartRequest = new StandardMultipartHttpServletRequest(request);
}
if (multipartRequest != null) {
List<MultipartFile> multipartFiles = multipartRequest.getFiles(name);
return multipartFiles.toArray(new MultipartFile[0]);
}
else {
return null;
}
}
else if (Part.class == parameter.getNestedParameterType()) {
return (isMultipart ? request.getPart(name): null);
}
else if (isPartCollection(parameter)) {
return (isMultipart ? resolvePartList(request, name) : null);
}
else if (isPartArray(parameter)) {
return (isMultipart ? resolvePartList(request, name).toArray(new Part[0]) : null);
}
else {
return UNRESOLVABLE;
}
}
@Override
@UsesJava8
public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer,
NativeWebRequest request, WebDataBinderFactory binderFactory) throws Exception {
HttpServletRequest servletRequest = request.getNativeRequest(HttpServletRequest.class);
assertIsMultipartRequest(servletRequest);
MultipartHttpServletRequest multipartRequest =
WebUtils.getNativeRequest(servletRequest, MultipartHttpServletRequest.class);
Class<?> paramType = parameter.getParameterType();
boolean optional = paramType.getName().equals("java.util.Optional");
if (optional) {
parameter.increaseNestingLevel();
paramType = parameter.getNestedParameterType();
}
String partName = getPartName(parameter);
Object arg;
if (MultipartFile.class == paramType) {
Assert.notNull(multipartRequest, "Expected MultipartHttpServletRequest: is a MultipartResolver configured?");
arg = multipartRequest.getFile(partName);
}
else if (isMultipartFileCollection(parameter)) {
Assert.notNull(multipartRequest, "Expected MultipartHttpServletRequest: is a MultipartResolver configured?");
arg = multipartRequest.getFiles(partName);
}
else if (isMultipartFileArray(parameter)) {
Assert.notNull(multipartRequest, "Expected MultipartHttpServletRequest: is a MultipartResolver configured?");
List<MultipartFile> files = multipartRequest.getFiles(partName);
arg = files.toArray(new MultipartFile[files.size()]);
}
else if ("javax.servlet.http.Part".equals(paramType.getName())) {
assertIsMultipartRequest(servletRequest);
arg = servletRequest.getPart(partName);
}
else if (isPartCollection(parameter)) {
assertIsMultipartRequest(servletRequest);
arg = new ArrayList<Object>(servletRequest.getParts());
}
else if (isPartArray(parameter)) {
assertIsMultipartRequest(servletRequest);
arg = RequestPartResolver.resolvePart(servletRequest);
}
else {
try {
HttpInputMessage inputMessage = new RequestPartServletServerHttpRequest(servletRequest, partName);
arg = readWithMessageConverters(inputMessage, parameter, parameter.getNestedGenericParameterType());
WebDataBinder binder = binderFactory.createBinder(request, arg, partName);
if (arg != null) {
validateIfApplicable(binder, parameter);
if (binder.getBindingResult().hasErrors() && isBindExceptionRequired(binder, parameter)) {
throw new MethodArgumentNotValidException(parameter, binder.getBindingResult());
}
}
mavContainer.addAttribute(BindingResult.MODEL_KEY_PREFIX + partName, binder.getBindingResult());
}
catch (MissingServletRequestPartException ex) {
// handled below
arg = null;
}
}
RequestPart requestPart = parameter.getParameterAnnotation(RequestPart.class);
boolean isRequired = ((requestPart == null || requestPart.required()) && !optional);
if (arg == null && isRequired) {
throw new MissingServletRequestPartException(partName);
}
if (optional) {
arg = Optional.ofNullable(arg);
}
return arg;
}
public static boolean isMultipartArgument(MethodParameter parameter) {
Class<?> paramType = parameter.getNestedParameterType();
return (MultipartFile.class == paramType ||
isMultipartFileCollection(parameter) || isMultipartFileArray(parameter) ||
(Part.class == paramType || isPartCollection(parameter) || isPartArray(parameter)));
}
@Nullable
public static Object resolveMultipartArgument(String name, MethodParameter parameter, HttpServletRequest request)
throws Exception {
MultipartHttpServletRequest multipartRequest =
WebUtils.getNativeRequest(request, MultipartHttpServletRequest.class);
boolean isMultipart = (multipartRequest != null || isMultipartContent(request));
if (MultipartFile.class == parameter.getNestedParameterType()) {
if (multipartRequest == null && isMultipart) {
multipartRequest = new StandardMultipartHttpServletRequest(request);
}
return (multipartRequest != null ? multipartRequest.getFile(name) : null);
}
else if (isMultipartFileCollection(parameter)) {
if (multipartRequest == null && isMultipart) {
multipartRequest = new StandardMultipartHttpServletRequest(request);
}
return (multipartRequest != null ? multipartRequest.getFiles(name) : null);
}
else if (isMultipartFileArray(parameter)) {
if (multipartRequest == null && isMultipart) {
multipartRequest = new StandardMultipartHttpServletRequest(request);
}
if (multipartRequest != null) {
List<MultipartFile> multipartFiles = multipartRequest.getFiles(name);
return multipartFiles.toArray(new MultipartFile[0]);
}
else {
return null;
}
}
else if (Part.class == parameter.getNestedParameterType()) {
return (isMultipart ? request.getPart(name): null);
}
else if (isPartCollection(parameter)) {
return (isMultipart ? resolvePartList(request, name) : null);
}
else if (isPartArray(parameter)) {
return (isMultipart ? resolvePartList(request, name).toArray(new Part[0]) : null);
}
else {
return UNRESOLVABLE;
}
}
public static Object resolveMultipartArgument(String name, MethodParameter parameter, HttpServletRequest request)
throws Exception {
MultipartHttpServletRequest multipartRequest =
WebUtils.getNativeRequest(request, MultipartHttpServletRequest.class);
boolean isMultipart = (multipartRequest != null || isMultipartContent(request));
if (MultipartFile.class == parameter.getNestedParameterType()) {
if (multipartRequest == null && isMultipart) {
multipartRequest = adaptToMultipartHttpServletRequest(request);
}
return (multipartRequest != null ? multipartRequest.getFile(name) : null);
}
else if (isMultipartFileCollection(parameter)) {
if (multipartRequest == null && isMultipart) {
multipartRequest = adaptToMultipartHttpServletRequest(request);
}
return (multipartRequest != null ? multipartRequest.getFiles(name) : null);
}
else if (isMultipartFileArray(parameter)) {
if (multipartRequest == null && isMultipart) {
multipartRequest = adaptToMultipartHttpServletRequest(request);
}
if (multipartRequest != null) {
List<MultipartFile> multipartFiles = multipartRequest.getFiles(name);
return multipartFiles.toArray(new MultipartFile[multipartFiles.size()]);
}
else {
return null;
}
}
else if (servletPartClass != null) {
if (servletPartClass == parameter.getNestedParameterType()) {
return (isMultipart ? RequestPartResolver.resolvePart(request, name) : null);
}
else if (isPartCollection(parameter)) {
return (isMultipart ? RequestPartResolver.resolvePartList(request, name) : null);
}
else if (isPartArray(parameter)) {
return (isMultipart ? RequestPartResolver.resolvePartArray(request, name) : null);
}
}
return UNRESOLVABLE;
}