spring Jackson2JsonEncoder 源码
spring Jackson2JsonEncoder 代码
文件路径：/spring-web/src/main/java/org/springframework/http/codec/json/Jackson2JsonEncoder.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.json;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import com.fasterxml.jackson.core.PrettyPrinter;
import com.fasterxml.jackson.core.util.DefaultIndenter;
import com.fasterxml.jackson.core.util.DefaultPrettyPrinter;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectWriter;
import com.fasterxml.jackson.databind.SerializationFeature;
import reactor.core.publisher.Flux;
import org.springframework.core.ResolvableType;
import org.springframework.http.MediaType;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
import org.springframework.lang.Nullable;
import org.springframework.util.MimeType;
/**
* Encode from an {@code Object} stream to a byte stream of JSON objects using Jackson 2.9.
* For non-streaming use cases, {@link Flux} elements are collected into a {@link List}
* before serialization for performance reason.
*
* @author Sebastien Deleuze
* @author Arjen Poutsma
* @since 5.0
* @see Jackson2JsonDecoder
*/
public class Jackson2JsonEncoder extends AbstractJackson2Encoder {
@Nullable
private final PrettyPrinter ssePrettyPrinter;
public Jackson2JsonEncoder() {
this(Jackson2ObjectMapperBuilder.json().build());
}
@SuppressWarnings("deprecation")
public Jackson2JsonEncoder(ObjectMapper mapper, MimeType... mimeTypes) {
super(mapper, mimeTypes);
setStreamingMediaTypes(Arrays.asList(MediaType.APPLICATION_NDJSON, MediaType.APPLICATION_STREAM_JSON));
this.ssePrettyPrinter = initSsePrettyPrinter();
}
private static PrettyPrinter initSsePrettyPrinter() {
DefaultPrettyPrinter printer = new DefaultPrettyPrinter();
printer.indentObjectsWith(new DefaultIndenter(" ", "\ndata:"));
return printer;
}
@Override
protected ObjectWriter customizeWriter(ObjectWriter writer, @Nullable MimeType mimeType,
ResolvableType elementType, @Nullable Map<String, Object> hints) {
return (this.ssePrettyPrinter != null &&
MediaType.TEXT_EVENT_STREAM.isCompatibleWith(mimeType) &&
writer.getConfig().isEnabled(SerializationFeature.INDENT_OUTPUT) ?
writer.with(this.ssePrettyPrinter) : writer);
}
}
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