spring batch 学习 简单demo

以下是关于spring batch 简单学习环境，基于starter 生成代码

maven 项目

• pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>2.5.3</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

    <groupId>com.dalong</groupId>

    <artifactId>batchapp</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <name>batchapp</name>

    <description>mybatch app</description>

    <properties>

        <java.version>1.8</java.version>

    </properties>

    <dependencies>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-batch</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

 

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-configuration-processor</artifactId>

            <optional>true</optional>

        </dependency>

        <dependency>

            <groupId>com.h2database</groupId>

            <artifactId>h2</artifactId>

            <version>1.3.156</version>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

        <dependency>

            <groupId>org.springframework.batch</groupId>

            <artifactId>spring-batch-test</artifactId>

            <scope>test</scope>

        </dependency>

    </dependencies>

 

    <build>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

            </plugin>

        </plugins>

    </build>

 

</project>

 

• tasklet 定义

package com.dalong.batchapp;

 

import org.springframework.batch.core.StepContribution;

import org.springframework.batch.core.scope.context.ChunkContext;

import org.springframework.batch.core.step.tasklet.Tasklet;

import org.springframework.batch.repeat.RepeatStatus;

 

public class DemoTaskLet implements Tasklet {

    @Override

    public RepeatStatus execute(StepContribution stepContribution, ChunkContext chunkContext) throws Exception {

        System.out.println("demo");

        return RepeatStatus.FINISHED;

    }

}

 

• Job 以及step bean

package com.dalong.batchapp;

 

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.core.job.SimpleJob;

import org.springframework.batch.core.step.tasklet.TaskletStep;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.context.annotation.Bean;

 

 

@EnableBatchProcessing

@SpringBootApplication

public class BatchappApplication {

 

    @Autowired

    JobBuilderFactory jobBuilderFactory;

 

    @Autowired

    StepBuilderFactory stepBuilderFactory;

 

    public static void main(String[] args) {

        SpringApplication.run(BatchappApplication.class, args);

    }

 

    @Bean

    public DemoTaskLet demoTaskLet(){

        return new DemoTaskLet();

    }

    @Bean

 

    public Job myjob(){

        Step step = this.stepBuilderFactory.get("login").tasklet(demoTaskLet()).build();

        return this.jobBuilderFactory.get("mydemo").start(step).build();

    }

 

}

 

运行效果

rest api 调用

• rest 定义

package com.dalong.batchapp;

 

 

import org.springframework.batch.core.*;

import org.springframework.batch.core.launch.JobLauncher;

import org.springframework.batch.core.repository.JobExecutionAlreadyRunningException;

import org.springframework.batch.core.repository.JobInstanceAlreadyCompleteException;

import org.springframework.batch.core.repository.JobRestartException;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.RestController;

 

import java.util.HashMap;

import java.util.Map;

import java.util.UUID;

 

@RestController

public class ApiController {

    @Autowired

    JobLauncher jobLauncher;

    @Autowired

    Job myjob;

    @GetMapping(value = {"/demo"})

    public void runJob() throws JobInstanceAlreadyCompleteException, JobExecutionAlreadyRunningException, JobParametersInvalidException, JobRestartException {

        Map<String, JobParameter> context = new HashMap<>();

        //  确保每次都创建新的jobinstance

        context.put("id", new JobParameter(UUID.randomUUID().toString()));

        JobExecution jobExecution= jobLauncher.run(myjob,new JobParameters(context));

        System.out.println(jobExecution.getJobId());

    }

}

• 启动时禁止job 运行
  application 配置

 

spring.batch.job.enabled=false

问题

• If you want an embedded database (H2, HSQL or Derby), please put it on the classpath.
  解决方法:
  添加依赖

 

<dependency>

            <groupId>com.h2database</groupId>

            <artifactId>h2</artifactId>

            <version>1.3.156</version>

</dependency>

参考资料

https://mvnrepository.com/artifact/com.h2database/h2