Spring Boot wwwxjf555888com 2.0 整合Spring15012038888 Batch Java配置示例

學習使用Java配置創建Spring批處理作業（具有多個步驟）。它使用Spring Boot 2，Spring batch 4和H2數據庫來執行批處理作業。

項目結構
在這個項目中，我們將創建一個包含兩步任務的簡單作業，並執行作業以觀察日誌。工作執行流程將是 -

開始工作
執行任務一
執行任務二
完成工作
Spring Batch Java配置示例
Maven依賴
我們需要包含spring-boot-starter-batch依賴性。Spring批處理依賴於作爲持久數據存儲的作業存儲庫。所以我們也需要一個DB。我正在使用H2（內存數據庫），它與彈簧批量很好地集成。
pom.xml

複製

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

<groupId>com.howtodoinjava</groupId>
<artifactId>App</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>App</name>
<url>http://maven.apache.org</url>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.3.RELEASE</version>
</parent>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-batch</artifactId>
    </dependency>
    <dependency>
        <groupId>com.h2database</groupId>
        <artifactId>h2</artifactId>
        <scope>runtime</scope>
    </dependency>
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>

<repositories>
    <repository>
        <id>repository.spring.release</id>
        <name>Spring GA Repository</name>
        <url>http://repo.spring.io/release</url>
    </repository>
</repositories>

添加Tasklet
第一步是創建一些任務，這些任務將按某種順序運行以形成作業。在Spring批處理中，它們被實現爲Tasklet。
MyTaskOne.java

複製
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 MyTaskOne implements Tasklet {

public RepeatStatus execute(StepContribution contribution, ChunkContext chunkContext) throws Exception
{
    System.out.println("MyTaskOne start..");

    // ... your code
     
    System.out.println("MyTaskOne done..");
    return RepeatStatus.FINISHED;
}   

}
MyTaskTwo.java

複製
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 MyTaskTwo implements Tasklet {

public RepeatStatus execute(StepContribution contribution, ChunkContext chunkContext) throws Exception
{
    System.out.println("MyTaskTwo start..");

    // ... your code
     
    System.out.println("MyTaskTwo done..");
    return RepeatStatus.FINISHED;
}   

}
Spring批量配置
這是定義所有與作業相關的配置及其執行邏輯的主要步驟。
BatchConfig.java

複製

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.launch.support.RunIdIncrementer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import com.howtodoinjava.demo.tasks.MyTaskOne;
import com.howtodoinjava.demo.tasks.MyTaskTwo;

@Configuration
@EnableBatchProcessing
public class BatchConfig {

 
@Autowired
private JobBuilderFactory jobs;

@Autowired
private StepBuilderFactory steps;
 
@Bean
public Step stepOne(){
    return steps.get("stepOne")
            .tasklet(new MyTaskOne())
            .build();
}
 
@Bean
public Step stepTwo(){
    return steps.get("stepTwo")
            .tasklet(new MyTaskTwo())
            .build();
}  
 
@Bean
public Job demoJob(){
    return jobs.get("demoJob")
            .incrementer(new RunIdIncrementer())
            .start(stepOne())
            .next(stepTwo())
            .build();
}

}
演示
現在我們的簡單工作'demoJob'已配置好並準備好執行。當應用程序完全啓動時CommandLineRunner，我正在使用接口自動執行作業JobLauncher。

複製
import org.springframework.batch.core.Job;
import org.springframework.batch.core.JobParameters;
import org.springframework.batch.core.JobParametersBuilder;
import org.springframework.batch.core.launch.JobLauncher;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class App implements CommandLineRunner
{

@Autowired
JobLauncher jobLauncher;
 
@Autowired
Job job;
 
public static void main(String[] args)
{
    SpringApplication.run(App.class, args);
}

@Override
public void run(String... args) throws Exception
{
    JobParameters params = new JobParametersBuilder()
                .addString("JobID", String.valueOf(System.currentTimeMillis()))
                .toJobParameters();
    jobLauncher.run(job, params);
}

}
注意控制檯日誌。
複製
o.s.b.c.l.support.SimpleJobLauncher : Job: [SimpleJob: [name=demoJob]] launched with
the following parameters: [{JobID=1530697766768}]

o.s.batch.core.job.SimpleStepHandler : Executing step: [stepOne]
MyTaskOne start..
MyTaskOne done..

o.s.batch.core.job.SimpleStepHandler : Executing step: [stepTwo]
MyTaskTwo start..
MyTaskTwo done..

o.s.b.c.l.support.SimpleJobLauncher : Job: [SimpleJob: [name=demoJob]] completed with
the following parameters: [{JobID=1530697766768}] and the following status: [COMPLETED]
Spring還自動運行配置的批處理作業。要禁用作業的自動運行，您需要spring.batch.job.enabled在application.properties文件中使用屬性。