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>
