spring JacksonJsonParser 源码
springboot JacksonJsonParser 代码
文件路径：/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/json/JacksonJsonParser.java
/*
* Copyright 2012-2019 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.boot.json;
import java.util.List;
import java.util.Map;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
/**
* Thin wrapper to adapt Jackson 2 {@link ObjectMapper} to {@link JsonParser}.
*
* @author Dave Syer
* @since 1.0.0
* @see JsonParserFactory
*/
public class JacksonJsonParser extends AbstractJsonParser {
private static final MapTypeReference MAP_TYPE = new MapTypeReference();
private static final ListTypeReference LIST_TYPE = new ListTypeReference();
private ObjectMapper objectMapper; // Late binding
/**
* Creates an instance with the specified {@link ObjectMapper}.
* @param objectMapper the object mapper to use
*/
public JacksonJsonParser(ObjectMapper objectMapper) {
this.objectMapper = objectMapper;
}
/**
* Creates an instance with a default {@link ObjectMapper} that is created lazily.
*/
public JacksonJsonParser() {
}
@Override
public Map<String, Object> parseMap(String json) {
return tryParse(() -> getObjectMapper().readValue(json, MAP_TYPE), Exception.class);
}
@Override
public List<Object> parseList(String json) {
return tryParse(() -> getObjectMapper().readValue(json, LIST_TYPE), Exception.class);
}
private ObjectMapper getObjectMapper() {
if (this.objectMapper == null) {
this.objectMapper = new ObjectMapper();
}
return this.objectMapper;
}
private static class MapTypeReference extends TypeReference<Map<String, Object>> {
}
private static class ListTypeReference extends TypeReference<List<Object>> {
}
}
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- 本文标签： Java Spring Spring Boot
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