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org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter Maven / Gradle / Ivy
/*
* 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
*
* http://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.converter.json;
import java.io.IOException;
import java.lang.reflect.Type;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;
import java.util.Collections;
import java.util.concurrent.atomic.AtomicReference;
import com.fasterxml.jackson.core.JsonEncoding;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonProcessingException;
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.JavaType;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectWriter;
import com.fasterxml.jackson.databind.SerializationConfig;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.databind.exc.InvalidDefinitionException;
import com.fasterxml.jackson.databind.ser.FilterProvider;
import com.fasterxml.jackson.databind.type.TypeFactory;
import org.springframework.core.GenericTypeResolver;
import org.springframework.http.HttpInputMessage;
import org.springframework.http.HttpOutputMessage;
import org.springframework.http.MediaType;
import org.springframework.http.converter.AbstractGenericHttpMessageConverter;
import org.springframework.http.converter.HttpMessageConversionException;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.HttpMessageNotReadableException;
import org.springframework.http.converter.HttpMessageNotWritableException;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.TypeUtils;
/**
* Abstract base class for Jackson based and content type independent
* {@link HttpMessageConverter} implementations.
*
* Compatible with Jackson 2.9 and higher, as of Spring 5.0.
*
* @author Arjen Poutsma
* @author Keith Donald
* @author Rossen Stoyanchev
* @author Juergen Hoeller
* @author Sebastien Deleuze
* @since 4.1
* @see MappingJackson2HttpMessageConverter
*/
public abstract class AbstractJackson2HttpMessageConverter extends AbstractGenericHttpMessageConverter {
/**
* The default charset used by the converter.
*/
public static final Charset DEFAULT_CHARSET = StandardCharsets.UTF_8;
protected ObjectMapper objectMapper;
@Nullable
private Boolean prettyPrint;
@Nullable
private PrettyPrinter ssePrettyPrinter;
protected AbstractJackson2HttpMessageConverter(ObjectMapper objectMapper) {
this.objectMapper = objectMapper;
setDefaultCharset(DEFAULT_CHARSET);
DefaultPrettyPrinter prettyPrinter = new DefaultPrettyPrinter();
prettyPrinter.indentObjectsWith(new DefaultIndenter(" ", "\ndata:"));
this.ssePrettyPrinter = prettyPrinter;
}
protected AbstractJackson2HttpMessageConverter(ObjectMapper objectMapper, MediaType supportedMediaType) {
this(objectMapper);
setSupportedMediaTypes(Collections.singletonList(supportedMediaType));
}
protected AbstractJackson2HttpMessageConverter(ObjectMapper objectMapper, MediaType... supportedMediaTypes) {
this(objectMapper);
setSupportedMediaTypes(Arrays.asList(supportedMediaTypes));
}
/**
* Set the {@code ObjectMapper} for this view.
* If not set, a default {@link ObjectMapper#ObjectMapper() ObjectMapper} is used.
* Setting a custom-configured {@code ObjectMapper} is one way to take further
* control of the JSON serialization process. For example, an extended
* {@link com.fasterxml.jackson.databind.ser.SerializerFactory}
* can be configured that provides custom serializers for specific types.
* The other option for refining the serialization process is to use Jackson's
* provided annotations on the types to be serialized, in which case a
* custom-configured ObjectMapper is unnecessary.
*/
public void setObjectMapper(ObjectMapper objectMapper) {
Assert.notNull(objectMapper, "ObjectMapper must not be null");
this.objectMapper = objectMapper;
configurePrettyPrint();
}
/**
* Return the underlying {@code ObjectMapper} for this view.
*/
public ObjectMapper getObjectMapper() {
return this.objectMapper;
}
/**
* Whether to use the {@link DefaultPrettyPrinter} when writing JSON.
* This is a shortcut for setting up an {@code ObjectMapper} as follows:
*
* ObjectMapper mapper = new ObjectMapper();
* mapper.configure(SerializationFeature.INDENT_OUTPUT, true);
* converter.setObjectMapper(mapper);
*
*/
public void setPrettyPrint(boolean prettyPrint) {
this.prettyPrint = prettyPrint;
configurePrettyPrint();
}
private void configurePrettyPrint() {
if (this.prettyPrint != null) {
this.objectMapper.configure(SerializationFeature.INDENT_OUTPUT, this.prettyPrint);
}
}
@Override
public boolean canRead(Class clazz, @Nullable MediaType mediaType) {
return canRead(clazz, null, mediaType);
}
@Override
public boolean canRead(Type type, @Nullable Class contextClass, @Nullable MediaType mediaType) {
if (!canRead(mediaType)) {
return false;
}
JavaType javaType = getJavaType(type, contextClass);
AtomicReference causeRef = new AtomicReference<>();
if (this.objectMapper.canDeserialize(javaType, causeRef)) {
return true;
}
logWarningIfNecessary(javaType, causeRef.get());
return false;
}
@Override
public boolean canWrite(Class clazz, @Nullable MediaType mediaType) {
if (!canWrite(mediaType)) {
return false;
}
AtomicReference causeRef = new AtomicReference<>();
if (this.objectMapper.canSerialize(clazz, causeRef)) {
return true;
}
logWarningIfNecessary(clazz, causeRef.get());
return false;
}
/**
* Determine whether to log the given exception coming from a
* {@link ObjectMapper#canDeserialize} / {@link ObjectMapper#canSerialize} check.
* @param type the class that Jackson tested for (de-)serializability
* @param cause the Jackson-thrown exception to evaluate
* (typically a {@link JsonMappingException})
* @since 4.3
*/
protected void logWarningIfNecessary(Type type, @Nullable Throwable cause) {
if (cause == null) {
return;
}
// Do not log warning for serializer not found (note: different message wording on Jackson 2.9)
boolean debugLevel = (cause instanceof JsonMappingException && cause.getMessage().startsWith("Cannot find"));
if (debugLevel ? logger.isDebugEnabled() : logger.isWarnEnabled()) {
String msg = "Failed to evaluate Jackson " + (type instanceof JavaType ? "de" : "") +
"serialization for type [" + type + "]";
if (debugLevel) {
logger.debug(msg, cause);
}
else if (logger.isDebugEnabled()) {
logger.warn(msg, cause);
}
else {
logger.warn(msg + ": " + cause);
}
}
}
@Override
protected Object readInternal(Class clazz, HttpInputMessage inputMessage)
throws IOException, HttpMessageNotReadableException {
JavaType javaType = getJavaType(clazz, null);
return readJavaType(javaType, inputMessage);
}
@Override
public Object read(Type type, @Nullable Class contextClass, HttpInputMessage inputMessage)
throws IOException, HttpMessageNotReadableException {
JavaType javaType = getJavaType(type, contextClass);
return readJavaType(javaType, inputMessage);
}
private Object readJavaType(JavaType javaType, HttpInputMessage inputMessage) throws IOException {
try {
if (inputMessage instanceof MappingJacksonInputMessage) {
Class deserializationView = ((MappingJacksonInputMessage) inputMessage).getDeserializationView();
if (deserializationView != null) {
return this.objectMapper.readerWithView(deserializationView).forType(javaType).
readValue(inputMessage.getBody());
}
}
return this.objectMapper.readValue(inputMessage.getBody(), javaType);
}
catch (InvalidDefinitionException ex) {
throw new HttpMessageConversionException("Type definition error: " + ex.getType(), ex);
}
catch (JsonProcessingException ex) {
throw new HttpMessageNotReadableException("JSON parse error: " + ex.getOriginalMessage(), ex, inputMessage);
}
}
@Override
protected void writeInternal(Object object, @Nullable Type type, HttpOutputMessage outputMessage)
throws IOException, HttpMessageNotWritableException {
MediaType contentType = outputMessage.getHeaders().getContentType();
JsonEncoding encoding = getJsonEncoding(contentType);
JsonGenerator generator = this.objectMapper.getFactory().createGenerator(outputMessage.getBody(), encoding);
try {
writePrefix(generator, object);
Object value = object;
Class serializationView = null;
FilterProvider filters = null;
JavaType javaType = null;
if (object instanceof MappingJacksonValue) {
MappingJacksonValue container = (MappingJacksonValue) object;
value = container.getValue();
serializationView = container.getSerializationView();
filters = container.getFilters();
}
if (type != null && TypeUtils.isAssignable(type, value.getClass())) {
javaType = getJavaType(type, null);
}
ObjectWriter objectWriter = (serializationView != null ?
this.objectMapper.writerWithView(serializationView) : this.objectMapper.writer());
if (filters != null) {
objectWriter = objectWriter.with(filters);
}
if (javaType != null && javaType.isContainerType()) {
objectWriter = objectWriter.forType(javaType);
}
SerializationConfig config = objectWriter.getConfig();
if (contentType != null && contentType.isCompatibleWith(MediaType.TEXT_EVENT_STREAM) &&
config.isEnabled(SerializationFeature.INDENT_OUTPUT)) {
objectWriter = objectWriter.with(this.ssePrettyPrinter);
}
objectWriter.writeValue(generator, value);
writeSuffix(generator, object);
generator.flush();
}
catch (InvalidDefinitionException ex) {
throw new HttpMessageConversionException("Type definition error: " + ex.getType(), ex);
}
catch (JsonProcessingException ex) {
throw new HttpMessageNotWritableException("Could not write JSON: " + ex.getOriginalMessage(), ex);
}
}
/**
* Write a prefix before the main content.
* @param generator the generator to use for writing content.
* @param object the object to write to the output message.
*/
protected void writePrefix(JsonGenerator generator, Object object) throws IOException {
}
/**
* Write a suffix after the main content.
* @param generator the generator to use for writing content.
* @param object the object to write to the output message.
*/
protected void writeSuffix(JsonGenerator generator, Object object) throws IOException {
}
/**
* Return the Jackson {@link JavaType} for the specified type and context class.
* @param type the generic type to return the Jackson JavaType for
* @param contextClass a context class for the target type, for example a class
* in which the target type appears in a method signature (can be {@code null})
* @return the Jackson JavaType
*/
protected JavaType getJavaType(Type type, @Nullable Class contextClass) {
TypeFactory typeFactory = this.objectMapper.getTypeFactory();
return typeFactory.constructType(GenericTypeResolver.resolveType(type, contextClass));
}
/**
* Determine the JSON encoding to use for the given content type.
* @param contentType the media type as requested by the caller
* @return the JSON encoding to use (never {@code null})
*/
protected JsonEncoding getJsonEncoding(@Nullable MediaType contentType) {
if (contentType != null && contentType.getCharset() != null) {
Charset charset = contentType.getCharset();
for (JsonEncoding encoding : JsonEncoding.values()) {
if (charset.name().equals(encoding.getJavaName())) {
return encoding;
}
}
}
return JsonEncoding.UTF8;
}
@Override
@Nullable
protected MediaType getDefaultContentType(Object object) throws IOException {
if (object instanceof MappingJacksonValue) {
object = ((MappingJacksonValue) object).getValue();
}
return super.getDefaultContentType(object);
}
@Override
protected Long getContentLength(Object object, @Nullable MediaType contentType) throws IOException {
if (object instanceof MappingJacksonValue) {
object = ((MappingJacksonValue) object).getValue();
}
return super.getContentLength(object, contentType);
}
}
