spring-batch JsonLineMapper 源码
spring-batch JsonLineMapper 代码
文件路径：/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/file/mapping/JsonLineMapper.java
/*
* Copyright 2009-2014 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.batch.item.file.mapping;
import java.util.Map;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.MappingJsonFactory;
import org.springframework.batch.item.file.LineMapper;
/**
* Interpret a line as a JSON object and parse it up to a Map. The line should be a
* standard JSON object, starting with "{" and ending with "}" and composed of
* <code>name:value</code> pairs separated by commas. Whitespace is ignored, e.g.
*
* <pre>
* { "foo" : "bar", "value" : 123 }
* </pre>
*
* The values can also be JSON objects (which are converted to maps):
*
* <pre>
* { "foo": "bar", "map": { "one": 1, "two": 2}}
* </pre>
*
* @author Dave Syer
*
*/
public class JsonLineMapper implements LineMapper<Map<String, Object>> {
private MappingJsonFactory factory = new MappingJsonFactory();
/**
* Interpret the line as a Json object and create a Map from it.
*
* @see LineMapper#mapLine(String, int)
*/
@Override
public Map<String, Object> mapLine(String line, int lineNumber) throws Exception {
Map<String, Object> result;
JsonParser parser = factory.createParser(line);
@SuppressWarnings("unchecked")
Map<String, Object> token = parser.readValueAs(Map.class);
result = token;
return result;
}
}
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