[springBoot] spring batch FlatFileItemWriter

목차

아래 포스팅에서 이어진 내용입니다.

[springBoot] spring batch step startLimit

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객체의 데이터를 읽어서 delimited, formatted 방식을 적용해서 파일에 쓰는 예제

JobTestConfig

package com.dev.lsy.springbatchremind.batch;

import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.batch.core.ExitStatus;
import org.springframework.batch.core.Job;
import org.springframework.batch.core.Step;
import org.springframework.batch.core.configuration.annotation.JobBuilderFactory;
import org.springframework.batch.core.configuration.annotation.JobScope;
import org.springframework.batch.core.configuration.annotation.StepBuilderFactory;
import org.springframework.batch.core.configuration.annotation.StepScope;
import org.springframework.batch.core.launch.support.RunIdIncrementer;
import org.springframework.batch.core.step.tasklet.Tasklet;
import org.springframework.batch.item.ItemReader;
import org.springframework.batch.item.ItemWriter;
import org.springframework.batch.item.file.builder.FlatFileItemWriterBuilder;
import org.springframework.batch.item.json.JacksonJsonObjectMarshaller;
import org.springframework.batch.item.json.builder.JsonFileItemWriterBuilder;
import org.springframework.batch.item.support.ListItemReader;
import org.springframework.batch.repeat.RepeatStatus;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.FileSystemResource;

import java.util.Arrays;
import java.util.List;

@Slf4j
@RequiredArgsConstructor
@Configuration
public class JobTestConfig {

    private final JobBuilderFactory jobBuilderFactory;
    private final StepBuilderFactory stepBuilderFactory;

    @Bean
    //job
    public Job job1() {
        return jobBuilderFactory.get("job1")
                //jobParameter 자동 증감
                .incrementer(new RunIdIncrementer())
                .start(step1())
                .build();
    }

    @Bean
    //step
    public Step step1() {
        return stepBuilderFactory.get("step1")
                //chunk 기반 작업
                .<Person, Person>chunk(10)
                .reader(customReader())
                //여기만 다르다.
                .writer(customWriter())
                .build();
    }

    //reader
    @Bean
    public ListItemReader customReader() {

        //테스트 리스트(여기는 동일)
        List<Person> list = Arrays.asList(
                new Person(1L, "아이언맨", 51),
                new Person(2L, "토르", 10000),
                new Person(3L, "헐크", 52)
            );
        ListItemReader<Person> reader = new ListItemReader<>(list);

        return reader;
    }

    @Bean
    public ItemWriter<? super Person>  customWriter() {
        return new FlatFileItemWriterBuilder<Person>()
                .name("flatFileWriter")
                .resource(new FileSystemResource("output/output.txt"))
                .formatted()
                //id 2자는 숫자(d), name은 6자 문자(s), age도 숫자(d)
                .format("%-2d%-6s%-2d")
                //.delimited()		//구분자 방식은 이 옵션이 추가된다.
                //.delimiter("#")	
                .names(new String[]{"id", "name", "age"})
                .build();
    }
}

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개인 스터디 기록을 메모하는 공간이라 틀린점이 있을 수 있습니다.

틀린 점 있을 경우 댓글 부탁드립니다.

reference: https://www.inflearn.com/course/%EC%8A%A4%ED%94%84%EB%A7%81-%EB%B0%B0%EC%B9%98

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다음 내용

[springBoot] spring batch jsonFileItemWriter