spring-batch HeaderCopyCallback 源码
spring-batch HeaderCopyCallback 代码
文件路径：/spring-batch-samples/src/main/java/org/springframework/batch/sample/support/HeaderCopyCallback.java
/*
* Copyright 2006-2014 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.sample.support;
import java.io.IOException;
import java.io.Writer;
import org.springframework.batch.item.file.FlatFileHeaderCallback;
import org.springframework.batch.item.file.LineCallbackHandler;
import org.springframework.util.Assert;
/**
* Designed to be registered with both
* {@link org.springframework.batch.item.file.FlatFileItemReader} and
* {@link org.springframework.batch.item.file.FlatFileItemWriter} and copy header line
* from input file to output file.
*/
public class HeaderCopyCallback implements LineCallbackHandler, FlatFileHeaderCallback {
private String header = "";
@Override
public void handleLine(String line) {
Assert.notNull(line, "line must not be null");
this.header = line;
}
@Override
public void writeHeader(Writer writer) throws IOException {
writer.write("header from input: " + header);
}
}
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