spring Jaxb2XmlEncoder 源码
spring Jaxb2XmlEncoder 代码
文件路径:/spring-web/src/main/java/org/springframework/http/codec/xml/Jaxb2XmlEncoder.java
/*
* Copyright 2002-2021 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.xml;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;
import java.util.Map;
import java.util.function.Function;
import jakarta.xml.bind.JAXBException;
import jakarta.xml.bind.MarshalException;
import jakarta.xml.bind.Marshaller;
import jakarta.xml.bind.annotation.XmlRootElement;
import jakarta.xml.bind.annotation.XmlType;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import org.springframework.core.ResolvableType;
import org.springframework.core.codec.AbstractSingleValueEncoder;
import org.springframework.core.codec.CodecException;
import org.springframework.core.codec.EncodingException;
import org.springframework.core.codec.Hints;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.core.io.buffer.DataBufferUtils;
import org.springframework.core.log.LogFormatUtils;
import org.springframework.http.MediaType;
import org.springframework.lang.Nullable;
import org.springframework.util.ClassUtils;
import org.springframework.util.MimeType;
import org.springframework.util.MimeTypeUtils;
/**
* Encode from single value to a byte stream containing XML elements.
*
* <p>{@link jakarta.xml.bind.annotation.XmlElements @XmlElements} and
* {@link jakarta.xml.bind.annotation.XmlElement @XmlElement} can be used
* to specify how collections should be marshalled.
*
* @author Sebastien Deleuze
* @author Arjen Poutsma
* @since 5.0
* @see Jaxb2XmlDecoder
*/
public class Jaxb2XmlEncoder extends AbstractSingleValueEncoder<Object> {
private final JaxbContextContainer jaxbContexts = new JaxbContextContainer();
private Function<Marshaller, Marshaller> marshallerProcessor = Function.identity();
public Jaxb2XmlEncoder() {
super(MimeTypeUtils.APPLICATION_XML, MimeTypeUtils.TEXT_XML, new MediaType("application", "*+xml"));
}
/**
* Configure a processor function to customize Marshaller instances.
* @param processor the function to use
* @since 5.1.3
*/
public void setMarshallerProcessor(Function<Marshaller, Marshaller> processor) {
this.marshallerProcessor = this.marshallerProcessor.andThen(processor);
}
/**
* Return the configured processor for customizing Marshaller instances.
* @since 5.1.3
*/
public Function<Marshaller, Marshaller> getMarshallerProcessor() {
return this.marshallerProcessor;
}
@Override
public boolean canEncode(ResolvableType elementType, @Nullable MimeType mimeType) {
if (super.canEncode(elementType, mimeType)) {
Class<?> outputClass = elementType.toClass();
return (outputClass.isAnnotationPresent(XmlRootElement.class) ||
outputClass.isAnnotationPresent(XmlType.class));
}
else {
return false;
}
}
@Override
protected Flux<DataBuffer> encode(Object value, DataBufferFactory bufferFactory,
ResolvableType valueType, @Nullable MimeType mimeType, @Nullable Map<String, Object> hints) {
// we're relying on doOnDiscard in base class
return Mono.fromCallable(() -> encodeValue(value, bufferFactory, valueType, mimeType, hints)).flux();
}
@Override
public DataBuffer encodeValue(Object value, DataBufferFactory bufferFactory,
ResolvableType valueType, @Nullable MimeType mimeType, @Nullable Map<String, Object> hints) {
if (!Hints.isLoggingSuppressed(hints)) {
LogFormatUtils.traceDebug(logger, traceOn -> {
String formatted = LogFormatUtils.formatValue(value, !traceOn);
return Hints.getLogPrefix(hints) + "Encoding [" + formatted + "]";
});
}
boolean release = true;
DataBuffer buffer = bufferFactory.allocateBuffer(1024);
try {
OutputStream outputStream = buffer.asOutputStream();
Class<?> clazz = ClassUtils.getUserClass(value);
Marshaller marshaller = initMarshaller(clazz);
marshaller.marshal(value, outputStream);
release = false;
return buffer;
}
catch (MarshalException ex) {
throw new EncodingException("Could not marshal " + value.getClass() + " to XML", ex);
}
catch (JAXBException ex) {
throw new CodecException("Invalid JAXB configuration", ex);
}
finally {
if (release) {
DataBufferUtils.release(buffer);
}
}
}
private Marshaller initMarshaller(Class<?> clazz) throws CodecException, JAXBException {
Marshaller marshaller = this.jaxbContexts.createMarshaller(clazz);
marshaller.setProperty(Marshaller.JAXB_ENCODING, StandardCharsets.UTF_8.name());
marshaller = this.marshallerProcessor.apply(marshaller);
return marshaller;
}
}
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