spring ResponseExtractor 源码
spring ResponseExtractor 代码
文件路径：/spring-web/src/main/java/org/springframework/web/client/ResponseExtractor.java
/*
* Copyright 2002-2018 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.client;
import java.io.IOException;
import java.lang.reflect.Type;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.lang.Nullable;
/**
* Generic callback interface used by {@link RestTemplate}'s retrieval methods.
* Implementations of this interface perform the actual work of extracting data
* from a {@link ClientHttpResponse}, but don't need to worry about exception
* handling or closing resources.
*
* <p>Used internally by the {@link RestTemplate}, but also useful for
* application code. There is one available factory method, see
* {@link RestTemplate#responseEntityExtractor(Type)}.
*
* @author Arjen Poutsma
* @since 3.0
* @param <T> the data type
* @see RestTemplate#execute
*/
@FunctionalInterface
public interface ResponseExtractor<T> {
/**
* Extract data from the given {@code ClientHttpResponse} and return it.
* @param response the HTTP response
* @return the extracted data
* @throws IOException in case of I/O errors
*/
@Nullable
T extractData(ClientHttpResponse response) throws IOException;
}
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