spring ResourceHttpMessageReader 源码
spring ResourceHttpMessageReader 代码
文件路径：/spring-web/src/main/java/org/springframework/http/codec/ResourceHttpMessageReader.java
/*
* Copyright 2002-2020 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.http.codec;
import java.util.Map;
import org.springframework.core.ResolvableType;
import org.springframework.core.codec.Hints;
import org.springframework.core.codec.ResourceDecoder;
import org.springframework.core.io.Resource;
import org.springframework.http.ReactiveHttpInputMessage;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.util.StringUtils;
/**
* {@code HttpMessageReader} that wraps and delegates to a {@link ResourceDecoder}
* that extracts the filename from the {@code "Content-Disposition"} header, if
* available, and passes it as the {@link ResourceDecoder#FILENAME_HINT}.
*
* @author Rossen Stoyanchev
* @since 5.2
*/
public class ResourceHttpMessageReader extends DecoderHttpMessageReader<Resource> {
public ResourceHttpMessageReader() {
super(new ResourceDecoder());
}
public ResourceHttpMessageReader(ResourceDecoder resourceDecoder) {
super(resourceDecoder);
}
@Override
protected Map<String, Object> getReadHints(ResolvableType elementType, ReactiveHttpInputMessage message) {
String filename = message.getHeaders().getContentDisposition().getFilename();
return (StringUtils.hasText(filename) ?
Hints.from(ResourceDecoder.FILENAME_HINT, filename) : Hints.none());
}
@Override
protected Map<String, Object> getReadHints(ResolvableType actualType, ResolvableType elementType,
ServerHttpRequest request, ServerHttpResponse response) {
return getReadHints(elementType, request);
}
}
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