SpringBatch读取txt文件

读平面文件 也就是纯文本

定义：Txt文件

使用：FlatFileItemReader

常用方法：readLine、reader

方式一：字符串的截取

需求：读取user.txt,解析出用户信息，封装成下面的user对象

user.txt

1#dadfei#18
2#erfei#19
3#sanfei#17
4#sifei#16
5#wufei#15

@Data
public class User {
    private Long id;
    private String name;
    private int age;

}

代码实现：

package com.springBatch.demo.flatFileReaderJob;

import org.springframework.batch.core.Job;
import org.springframework.batch.core.Step;
import org.springframework.batch.core.configuration.annotation.EnableBatchProcessing;
import org.springframework.batch.core.configuration.annotation.JobBuilderFactory;
import org.springframework.batch.core.configuration.annotation.StepBuilderFactory;
import org.springframework.batch.item.*;
import org.springframework.batch.item.file.FlatFileItemReader;
import org.springframework.batch.item.file.builder.FlatFileItemReaderBuilder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.core.io.ClassPathResource;

import java.util.List;


@EnableBatchProcessing
@SpringBootApplication
public class FlatReaderJob {
    @Autowired
    private JobBuilderFactory jobBuilderFactory;
    @Autowired
    private StepBuilderFactory stepBuilderFactory;
    // first  job--step--chunk--itemreader --writer

    @Bean
    public ItemWriter<User> itemWriter() {
        return new ItemWriter<User>() {
            @Override
            public void write(List<? extends User> items) throws Exception {
                items.forEach(System.out::println);
            }
        };
    }

    @Bean
    public FlatFileItemReader<User> itemReader() {
        return new FlatFileItemReaderBuilder<User>()
                .name("user-itemReader")//起名字
                .resource(new ClassPathResource("user.txt"))//从哪里读
                .delimited().delimiter("#")//分隔符是什么
                .names("id","name","age")//分割出来的元素 归属于
                .targetType(User.class)//分割后 封装到哪里 
                .build();
    }

    @Bean
    public Step step() {
        return stepBuilderFactory.get("step1")
                .<User,User>chunk(1)
                .reader(itemReader())
                .writer(itemWriter())
                .build();
    }

    @Bean
    public Job job() {
        return jobBuilderFactory.get("flat-reader-job")
                .start(step())
                .build();
    }

    public static void main(String[] args) {
        SpringApplication.run(FlatReaderJob.class, args);
    }
}

运行结果：

User(id=1, name=dadfei, age=18)
User(id=2, name=erfei, age=19)
User(id=3, name=sanfei, age=17)
User(id=4, name=sifei, age=16)
User(id=5, name=wufei, age=15)