spring security HttpMessageConverters 源码
spring security HttpMessageConverters 代码
文件路径：/oauth2/oauth2-core/src/main/java/org/springframework/security/oauth2/core/http/converter/HttpMessageConverters.java
/*
* 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
*
* 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.security.oauth2.core.http.converter;
import org.springframework.http.converter.GenericHttpMessageConverter;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.GsonHttpMessageConverter;
import org.springframework.http.converter.json.JsonbHttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.util.ClassUtils;
/**
* Utility methods for {@link HttpMessageConverter}'s.
*
* @author Joe Grandja
* @since 5.1
*/
final class HttpMessageConverters {
private static final boolean jackson2Present;
private static final boolean gsonPresent;
private static final boolean jsonbPresent;
static {
ClassLoader classLoader = HttpMessageConverters.class.getClassLoader();
jackson2Present = ClassUtils.isPresent("com.fasterxml.jackson.databind.ObjectMapper", classLoader)
&& ClassUtils.isPresent("com.fasterxml.jackson.core.JsonGenerator", classLoader);
gsonPresent = ClassUtils.isPresent("com.google.gson.Gson", classLoader);
jsonbPresent = ClassUtils.isPresent("javax.json.bind.Jsonb", classLoader);
}
private HttpMessageConverters() {
}
static GenericHttpMessageConverter<Object> getJsonMessageConverter() {
if (jackson2Present) {
return new MappingJackson2HttpMessageConverter();
}
if (gsonPresent) {
return new GsonHttpMessageConverter();
}
if (jsonbPresent) {
return new JsonbHttpMessageConverter();
}
return null;
}
}
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