org.springframework.web.method.annotation.RequestParamMethodArgumentResolver Maven / Gradle / Ivy
/*
* Copyright 2002-2015 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.web.method.annotation;
import java.beans.PropertyEditor;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.Part;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.core.GenericCollectionTypeResolver;
import org.springframework.core.MethodParameter;
import org.springframework.core.convert.ConversionService;
import org.springframework.core.convert.TypeDescriptor;
import org.springframework.core.convert.converter.Converter;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.MissingServletRequestParameterException;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RequestPart;
import org.springframework.web.bind.annotation.ValueConstants;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.method.support.UriComponentsContributor;
import org.springframework.web.multipart.MultipartException;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.multipart.MultipartResolver;
import org.springframework.web.util.UriComponentsBuilder;
import org.springframework.web.util.WebUtils;
/**
* Resolves method arguments annotated with @{@link RequestParam}, arguments of
* type {@link MultipartFile} in conjunction with Spring's {@link MultipartResolver}
* abstraction, and arguments of type {@code javax.servlet.http.Part} in conjunction
* with Servlet 3.0 multipart requests. This resolver can also be created in default
* resolution mode in which simple types (int, long, etc.) not annotated with
* @{@link RequestParam} are also treated as request parameters with the
* parameter name derived from the argument name.
*
* If the method parameter type is {@link Map}, the name specified in the
* annotation is used to resolve the request parameter String value. The value is
* then converted to a {@link Map} via type conversion assuming a suitable
* {@link Converter} or {@link PropertyEditor} has been registered.
* Or if a request parameter name is not specified the
* {@link RequestParamMapMethodArgumentResolver} is used instead to provide
* access to all request parameters in the form of a map.
*
*
A {@link WebDataBinder} is invoked to apply type conversion to resolved request
* header values that don't yet match the method parameter type.
*
* @author Arjen Poutsma
* @author Rossen Stoyanchev
* @author Brian Clozel
* @since 3.1
* @see RequestParamMapMethodArgumentResolver
*/
public class RequestParamMethodArgumentResolver extends AbstractNamedValueMethodArgumentResolver
implements UriComponentsContributor {
private static final TypeDescriptor STRING_TYPE_DESCRIPTOR = TypeDescriptor.valueOf(String.class);
private final boolean useDefaultResolution;
/**
* @param useDefaultResolution in default resolution mode a method argument
* that is a simple type, as defined in {@link BeanUtils#isSimpleProperty},
* is treated as a request parameter even if it it isn't annotated, the
* request parameter name is derived from the method parameter name.
*/
public RequestParamMethodArgumentResolver(boolean useDefaultResolution) {
this.useDefaultResolution = useDefaultResolution;
}
/**
* @param beanFactory a bean factory used for resolving ${...} placeholder
* and #{...} SpEL expressions in default values, or {@code null} if default
* values are not expected to contain expressions
* @param useDefaultResolution in default resolution mode a method argument
* that is a simple type, as defined in {@link BeanUtils#isSimpleProperty},
* is treated as a request parameter even if it it isn't annotated, the
* request parameter name is derived from the method parameter name.
*/
public RequestParamMethodArgumentResolver(ConfigurableBeanFactory beanFactory, boolean useDefaultResolution) {
super(beanFactory);
this.useDefaultResolution = useDefaultResolution;
}
/**
* Supports the following:
*
* - @RequestParam-annotated method arguments.
* This excludes {@link Map} params where the annotation doesn't
* specify a name. See {@link RequestParamMapMethodArgumentResolver}
* instead for such params.
*
- Arguments of type {@link MultipartFile}
* unless annotated with @{@link RequestPart}.
*
- Arguments of type {@code javax.servlet.http.Part}
* unless annotated with @{@link RequestPart}.
*
- In default resolution mode, simple type arguments
* even if not with @{@link RequestParam}.
*
*/
@Override
public boolean supportsParameter(MethodParameter parameter) {
Class paramType = parameter.getParameterType();
if (parameter.hasParameterAnnotation(RequestParam.class)) {
if (Map.class.isAssignableFrom(paramType)) {
String paramName = parameter.getParameterAnnotation(RequestParam.class).name();
return StringUtils.hasText(paramName);
}
else {
return true;
}
}
else {
if (parameter.hasParameterAnnotation(RequestPart.class)) {
return false;
}
else if (MultipartFile.class == paramType || "javax.servlet.http.Part".equals(paramType.getName())) {
return true;
}
else if (this.useDefaultResolution) {
return BeanUtils.isSimpleProperty(paramType);
}
else {
return false;
}
}
}
@Override
protected NamedValueInfo createNamedValueInfo(MethodParameter parameter) {
RequestParam ann = parameter.getParameterAnnotation(RequestParam.class);
return (ann != null ? new RequestParamNamedValueInfo(ann) : new RequestParamNamedValueInfo());
}
@Override
protected Object resolveName(String name, MethodParameter parameter, NativeWebRequest webRequest) throws Exception {
HttpServletRequest servletRequest = webRequest.getNativeRequest(HttpServletRequest.class);
MultipartHttpServletRequest multipartRequest =
WebUtils.getNativeRequest(servletRequest, MultipartHttpServletRequest.class);
Object arg;
if (MultipartFile.class == parameter.getParameterType()) {
assertIsMultipartRequest(servletRequest);
Assert.notNull(multipartRequest, "Expected MultipartHttpServletRequest: is a MultipartResolver configured?");
arg = multipartRequest.getFile(name);
}
else if (isMultipartFileCollection(parameter)) {
assertIsMultipartRequest(servletRequest);
Assert.notNull(multipartRequest, "Expected MultipartHttpServletRequest: is a MultipartResolver configured?");
arg = multipartRequest.getFiles(name);
}
else if (isMultipartFileArray(parameter)) {
assertIsMultipartRequest(servletRequest);
Assert.notNull(multipartRequest, "Expected MultipartHttpServletRequest: is a MultipartResolver configured?");
List multipartFiles = multipartRequest.getFiles(name);
arg = multipartFiles.toArray(new MultipartFile[multipartFiles.size()]);
}
else if ("javax.servlet.http.Part".equals(parameter.getParameterType().getName())) {
assertIsMultipartRequest(servletRequest);
arg = servletRequest.getPart(name);
}
else if (isPartCollection(parameter)) {
assertIsMultipartRequest(servletRequest);
arg = new ArrayList