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Spring Batch 之 Hello World ​

🏷️ Spring Batch

通过 Spring Initializr 创建 Spring Batch 项目，添加如下依赖：

  • Spring Batch
  • H2 Database
  • Spring Data JDBC

生成的 pom.xml 文件如下：

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>2.7.5</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>me.liujiajia.batch</groupId>
    <artifactId>hello-world</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>hello-world</name>
    <description>Batch demo project for Spring Boot</description>
    <properties>
        <java.version>17</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-data-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.codehaus.groovy</groupId>
            <artifactId>groovy</artifactId>
        </dependency>

        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>runtime</scope>
        </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>
            <plugin>
                <groupId>org.codehaus.gmavenplus</groupId>
                <artifactId>gmavenplus-plugin</artifactId>
                <version>1.13.1</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>addSources</goal>
                            <goal>addTestSources</goal>
                            <goal>generateStubs</goal>
                            <goal>compile</goal>
                            <goal>generateTestStubs</goal>
                            <goal>compileTests</goal>
                            <goal>removeStubs</goal>
                            <goal>removeTestStubs</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>

在 HelloWorldApplication 中添加 @EnableBatchProcessing 注解，并分别创建 Step 和 Job 类型的 bean 。

java
package me.liujiajia.batch.helloworld;

import org.springframework.batch.core.Job;
import org.springframework.batch.core.Step;
import org.springframework.batch.core.StepContribution;
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.scope.context.ChunkContext;
import org.springframework.batch.core.step.tasklet.Tasklet;
import org.springframework.batch.repeat.RepeatStatus;
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 HelloWorldApplication {

    @Autowired
    private JobBuilderFactory jobBuilderFactory;

    @Autowired
    private StepBuilderFactory stepBuilderFactory;

    @Bean
    public Step step() {
        return this.stepBuilderFactory.get("step1")
                .tasklet(new Tasklet() {
                    @Override
                    public RepeatStatus execute(StepContribution stepContribution, ChunkContext chunkContext) throws Exception {
                        System.out.println("Hello, World!");
                        return RepeatStatus.FINISHED;
                    }
                }).build();
    }

    @Bean
    public Job job(Step step) {
        return this.jobBuilderFactory.get("job")
                .start(step)
                .build();
    }

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

}

运行日志如下：

java
已连接到目标 VM, 地址: ''127.0.0.1:63420'，传输: '套接字''

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                (v2.7.5)

2022-11-23 18:20:31.731  INFO 25556 --- [           main] m.l.b.helloworld.HelloWorldApplication   : Starting HelloWorldApplication using Java 19.0.1 on Senior-JiaJia with PID 25556 (D:\hello-world\target\classes started by 佳佳 in D:\hello-world)
2022-11-23 18:20:31.739  INFO 25556 --- [           main] m.l.b.helloworld.HelloWorldApplication   : No active profile set, falling back to 1 default profile: "default"
2022-11-23 18:20:33.234  INFO 25556 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JDBC repositories in DEFAULT mode.
2022-11-23 18:20:33.258  INFO 25556 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 12 ms. Found 0 JDBC repository interfaces.
2022-11-23 18:20:34.278  INFO 25556 --- [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Starting...
2022-11-23 18:20:34.730  INFO 25556 --- [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Start completed.
2022-11-23 18:20:35.098  INFO 25556 --- [           main] o.s.b.c.r.s.JobRepositoryFactoryBean     : No database type set, using meta data indicating: H2
2022-11-23 18:20:35.400  INFO 25556 --- [           main] o.s.b.c.l.support.SimpleJobLauncher      : No TaskExecutor has been set, defaulting to synchronous executor.
2022-11-23 18:20:35.992  INFO 25556 --- [           main] m.l.b.helloworld.HelloWorldApplication   : Started HelloWorldApplication in 5.204 seconds (JVM running for 7.263)
2022-11-23 18:20:35.996  INFO 25556 --- [           main] o.s.b.a.b.JobLauncherApplicationRunner   : Running default command line with: []
2022-11-23 18:20:36.170  INFO 25556 --- [           main] o.s.b.c.l.support.SimpleJobLauncher      : Job: [SimpleJob: [name=job]] launched with the following parameters: [{}]
2022-11-23 18:20:36.299  INFO 25556 --- [           main] o.s.batch.core.job.SimpleStepHandler     : Executing step: [step1]
Hello, World!
2022-11-23 18:20:36.342  INFO 25556 --- [           main] o.s.batch.core.step.AbstractStep         : Step: [step1] executed in 41ms
2022-11-23 18:20:36.355  INFO 25556 --- [           main] o.s.b.c.l.support.SimpleJobLauncher      : Job: [SimpleJob: [name=job]] completed with the following parameters: [{}] and the following status: [COMPLETED] in 100ms
2022-11-23 18:20:36.368  INFO 25556 --- [ionShutdownHook] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Shutdown initiated...
2022-11-23 18:20:36.379  INFO 25556 --- [ionShutdownHook] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Shutdown completed.
与目标 VM 断开连接, 地址为: ''127.0.0.1:63420'，传输: '套接字''

进程已结束,退出代码0

参考

[1]:《Spring Batch 权威指南》 -- [美] 迈克尔·T.米内拉（Michael，T.，Minella）著