spring RequestParamArgumentResolver 源码
spring RequestParamArgumentResolver 代码
文件路径：/spring-web/src/main/java/org/springframework/web/service/invoker/RequestParamArgumentResolver.java
/*
* Copyright 2002-2022 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
*
* https://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.service.invoker;
import org.springframework.core.MethodParameter;
import org.springframework.core.convert.ConversionService;
import org.springframework.web.bind.annotation.RequestParam;
/**
* {@link HttpServiceArgumentResolver} for {@link RequestParam @RequestParam}
* annotated arguments.
*
* <p>When {@code "content-type"} is set to
* {@code "application/x-www-form-urlencoded"}, request parameters are encoded
* in the request body. Otherwise, they are added as URL query parameters.
*
* <p>The argument may be:
* <ul>
* <li>{@code Map<String, ?>} or
* {@link org.springframework.util.MultiValueMap MultiValueMap<String, ?>} with
* multiple request parameter and value(s).
* <li>{@code Collection} or an array of request parameters.
* <li>An individual request parameter.
* </ul>
*
* <p>Individual request parameters may be Strings or Objects to be converted to
* String values through the configured {@link ConversionService}.
*
* <p>If the value is required but {@code null}, {@link IllegalArgumentException}
* is raised. The value is not required if:
* <ul>
* <li>{@link RequestParam#required()} is set to {@code false}
* <li>{@link RequestParam#defaultValue()} provides a fallback value
* <li>The argument is declared as {@link java.util.Optional}
* </ul>
*
* @author Rossen Stoyanchev
* @since 6.0
*/
public class RequestParamArgumentResolver extends AbstractNamedValueArgumentResolver {
public RequestParamArgumentResolver(ConversionService conversionService) {
super(conversionService);
}
@Override
protected NamedValueInfo createNamedValueInfo(MethodParameter parameter) {
RequestParam annot = parameter.getParameterAnnotation(RequestParam.class);
return (annot == null ? null :
new NamedValueInfo(annot.name(), annot.required(), annot.defaultValue(), "request parameter", true));
}
@Override
protected void addRequestValue(String name, Object value, HttpRequestValues.Builder requestValues) {
requestValues.addRequestParameter(name, (String) value);
}
}
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