io.spring.batch.DownloadingStepExecutionListener.java Source code

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Here is the source code for io.spring.batch.DownloadingStepExecutionListener.java

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/*
 * Copyright 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
 *
 *      http://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 io.spring.batch;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

import org.springframework.batch.core.StepExecution;
import org.springframework.batch.core.listener.StepExecutionListenerSupport;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;
import org.springframework.util.StreamUtils;

/**
 * @author Michael Minella
 */
public class DownloadingStepExecutionListener extends StepExecutionListenerSupport {

    @Autowired
    private ResourceLoader resourceLoader;

    @Override
    public void beforeStep(StepExecution stepExecution) {
        String fileName = (String) stepExecution.getExecutionContext().get("fileName");

        Resource resource = this.resourceLoader.getResource(fileName);

        try {
            File file = File.createTempFile("input", ".csv");

            StreamUtils.copy(resource.getInputStream(), new FileOutputStream(file));

            stepExecution.getExecutionContext().put("localFile", file.getAbsolutePath());
            System.out.println(">> downloaded file : " + file.getAbsolutePath());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}