spring JsonStream 源码
springboot JsonStream 代码
文件路径：/spring-boot-project/spring-boot-tools/spring-boot-buildpack-platform/src/main/java/org/springframework/boot/buildpack/platform/json/JsonStream.java
/*
* Copyright 2012-2020 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.boot.buildpack.platform.json;
import java.io.IOException;
import java.io.InputStream;
import java.util.function.Consumer;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonToken;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
/**
* Utility class that allows JSON to be parsed and processed as it's received.
*
* @author Phillip Webb
* @since 2.3.0
*/
public class JsonStream {
private final ObjectMapper objectMapper;
/**
* Create a new {@link JsonStream} backed by the given object mapper.
* @param objectMapper the object mapper to use
*/
public JsonStream(ObjectMapper objectMapper) {
this.objectMapper = objectMapper;
}
/**
* Stream {@link ObjectNode object nodes} from the content as they become available.
* @param content the source content
* @param consumer the {@link ObjectNode} consumer
* @throws IOException on IO error
*/
public void get(InputStream content, Consumer<ObjectNode> consumer) throws IOException {
get(content, ObjectNode.class, consumer);
}
/**
* Stream objects from the content as they become available.
* @param <T> the object type
* @param content the source content
* @param type the object type
* @param consumer the {@link ObjectNode} consumer
* @throws IOException on IO error
*/
public <T> void get(InputStream content, Class<T> type, Consumer<T> consumer) throws IOException {
JsonFactory jsonFactory = this.objectMapper.getFactory();
JsonParser parser = jsonFactory.createParser(content);
while (!parser.isClosed()) {
JsonToken token = parser.nextToken();
if (token != null && token != JsonToken.END_OBJECT) {
T node = read(parser, type);
if (node != null) {
consumer.accept(node);
}
}
}
}
@SuppressWarnings("unchecked")
private <T> T read(JsonParser parser, Class<T> type) throws IOException {
if (ObjectNode.class.isAssignableFrom(type)) {
ObjectNode node = this.objectMapper.readTree(parser);
if (node == null || node.isMissingNode() || node.isEmpty()) {
return null;
}
return (T) node;
}
return this.objectMapper.readValue(parser, type);
}
}
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- 本文标签： Spring Boot Java Spring
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