spring JsonViewResponseBodyAdvice 源码
spring JsonViewResponseBodyAdvice 代码
文件路径：/spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/JsonViewResponseBodyAdvice.java
/*
* Copyright 2002-2017 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.servlet.mvc.method.annotation;
import com.fasterxml.jackson.annotation.JsonView;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJacksonValue;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.util.Assert;
/**
* A {@link ResponseBodyAdvice} implementation that adds support for Jackson's
* {@code @JsonView} annotation declared on a Spring MVC {@code @RequestMapping}
* or {@code @ExceptionHandler} method.
*
* <p>The serialization view specified in the annotation will be passed in to the
* {@link org.springframework.http.converter.json.MappingJackson2HttpMessageConverter}
* which will then use it to serialize the response body.
*
* <p>Note that despite {@code @JsonView} allowing for more than one class to
* be specified, the use for a response body advice is only supported with
* exactly one class argument. Consider the use of a composite interface.
*
* @author Rossen Stoyanchev
* @since 4.1
* @see com.fasterxml.jackson.annotation.JsonView
* @see com.fasterxml.jackson.databind.ObjectMapper#writerWithView(Class)
*/
public class JsonViewResponseBodyAdvice extends AbstractMappingJacksonResponseBodyAdvice {
@Override
public boolean supports(MethodParameter returnType, Class<? extends HttpMessageConverter<?>> converterType) {
return super.supports(returnType, converterType) && returnType.hasMethodAnnotation(JsonView.class);
}
@Override
protected void beforeBodyWriteInternal(MappingJacksonValue bodyContainer, MediaType contentType,
MethodParameter returnType, ServerHttpRequest request, ServerHttpResponse response) {
JsonView ann = returnType.getMethodAnnotation(JsonView.class);
Assert.state(ann != null, "No JsonView annotation");
Class<?>[] classes = ann.value();
if (classes.length != 1) {
throw new IllegalArgumentException(
"@JsonView only supported for response body advice with exactly 1 class argument: " + returnType);
}
bodyContainer.setSerializationView(classes[0]);
}
}
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