在默认情况，如果你对 Spring Batch 不进行配置的话。

Spring Batch 将会对所有存在的作业（Job）进行执行。

考察项目：https://github.com/cwiki-us-spring/cwiki-us-spring-batch-examples 你可以 Check out 到本地后运行：

gradlew :service:bootJar

将会对项目进行编译，程序将会输出：

C:WorkDirRepositorySpringcwiki-us-spring-guidescwiki-us-spring-batch-examples>gradlew :service:bootJar

Configure project :
You are using one or more deprecated Asciidoctor Gradle plugin features. To help with migration run with --warning-mode=all.

Repository https://jcenter.bintray.com/ replaced by https://maven.ossez.com/repository/internal.

BUILD SUCCESSFUL in 10s
6 actionable tasks: 2 executed, 4 up-to-date
C:WorkDirRepositorySpringcwiki-us-spring-guidescwiki-us-spring-batch-examples>

然后你可以运行

java -jar service/build/libs/service.jar

你会发现没有作业被执行

程序输出如下：

C:WorkDirRepositorySpringcwiki-us-spring-guidescwiki-us-spring-batch-examples>java -jar service/build/libs/service.jar

. _
/\ / ' _(_) _ \
( ( )__ | ' | '_| | '_ / _` | \
\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |___, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.1.4.RELEASE)

2020-02-18 15:32:38.016 INFO 28560 --- [ main] com.ossez.batch.service.Application : Starting Application on USWTWNB47141 with PID 28560 (C:WorkDirRepositorySpringcwiki-us-spring-guidescwiki-us-spring-batch-exam
plesservicebuildlibsservice.jar started by yhu in C:WorkDirRepositorySpringcwiki-us-spring-guidescwiki-us-spring-batch-examples)
2020-02-18 15:32:38.023 INFO 28560 --- [ main] com.ossez.batch.service.Application : No active profile set, falling back to default profiles: default
2020-02-18 15:32:40.344 INFO 28560 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2020-02-18 15:32:40.353 WARN 28560 --- [ main] com.zaxxer.hikari.util.DriverDataSource : Registered driver with driverClassName=org.hsqldb.jdbcDriver was not found, trying direct instantiation.
2020-02-18 15:32:40.854 INFO 28560 --- [ main] com.zaxxer.hikari.pool.PoolBase : HikariPool-1 - Driver does not support get/set network timeout for connections. (feature not supported)
2020-02-18 15:32:40.866 INFO 28560 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2020-02-18 15:32:42.711 INFO 28560 --- [ main] o.s.b.c.r.s.JobRepositoryFactoryBean : No database type set, using meta data indicating: HSQL
2020-02-18 15:32:43.137 INFO 28560 --- [ main] o.s.b.c.l.support.SimpleJobLauncher : No TaskExecutor has been set, defaulting to synchronous executor.
2020-02-18 15:32:44.502 INFO 28560 --- [ main] com.ossez.batch.service.Application : Started Application in 7.373 seconds (JVM running for 8.576)
2020-02-18 15:32:44.529 INFO 28560 --- [ Thread-2] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown initiated...
2020-02-18 15:32:44.537 INFO 28560 --- [ Thread-2] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown completed.

C:WorkDirRepositorySpringcwiki-us-spring-guidescwiki-us-spring-batch-examples>

如果你希望有作业被默认执行的话，你需要修改你检出项目的 application.properties 文件

将参数

spring.batch.job.enabled=false

修改为 true

然后重新编译然后执行，你将会发现所有作业将会被默认执行了。

C:WorkDirRepositorySpringcwiki-us-spring-guidescwiki-us-spring-batch-examples>java -jar service/build/libs/service.jar

. _
/\ / ' _(_) _ \
( ( )__ | ' | '_| | '_ / _` | \
\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |___, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.1.4.RELEASE)

2020-02-18 15:36:29.621 INFO 47168 --- [ main] com.ossez.batch.service.Application : Starting Application on USWTWNB47141 with PID 47168 (C:WorkDirRepositorySpringcwiki-us-spring-guidescwiki-us-spring-batch-exam
plesservicebuildlibsservice.jar started by yhu in C:WorkDirRepositorySpringcwiki-us-spring-guidescwiki-us-spring-batch-examples)
2020-02-18 15:36:29.625 INFO 47168 --- [ main] com.ossez.batch.service.Application : No active profile set, falling back to default profiles: default
2020-02-18 15:36:31.611 INFO 47168 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2020-02-18 15:36:31.620 WARN 47168 --- [ main] com.zaxxer.hikari.util.DriverDataSource : Registered driver with driverClassName=org.hsqldb.jdbcDriver was not found, trying direct instantiation.
2020-02-18 15:36:31.978 INFO 47168 --- [ main] com.zaxxer.hikari.pool.PoolBase : HikariPool-1 - Driver does not support get/set network timeout for connections. (feature not supported)
2020-02-18 15:36:31.984 INFO 47168 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2020-02-18 15:36:33.087 INFO 47168 --- [ main] o.s.b.c.r.s.JobRepositoryFactoryBean : No database type set, using meta data indicating: HSQL
2020-02-18 15:36:33.493 INFO 47168 --- [ main] o.s.b.c.l.support.SimpleJobLauncher : No TaskExecutor has been set, defaulting to synchronous executor.
2020-02-18 15:36:34.706 INFO 47168 --- [ main] com.ossez.batch.service.Application : Started Application in 5.952 seconds (JVM running for 7.127)
2020-02-18 15:36:34.709 INFO 47168 --- [ main] o.s.b.a.b.JobLauncherCommandLineRunner : Running default command line with: []
2020-02-18 15:36:34.851 INFO 47168 --- [ main] o.s.b.c.l.support.SimpleJobLauncher : Job: [FlowJob: [name=cloudClean]] launched with the following parameters: [{run.id=1}]
2020-02-18 15:36:34.884 INFO 47168 --- [ main] o.s.batch.core.job.SimpleStepHandler : Executing step: [readFilesStep]
2020-02-18 15:36:34.957 INFO 47168 --- [ main] c.o.batch.service.tasklet.FileTasklet : >>++>1582058194905
2020-02-18 15:36:34.974 INFO 47168 --- [ main] o.s.batch.core.job.SimpleStepHandler : Executing step: [deleteFilesStep]
2020-02-18 15:36:34.977 INFO 47168 --- [ main] c.o.batch.service.tasklet.FileTasklet : >>++>1582058194977
2020-02-18 15:36:34.987 INFO 47168 --- [ main] .o.b.s.JobCompletionNotificationListener : !!! JOB FINISHED! Time to verify the results
2020-02-18 15:36:34.990 INFO 47168 --- [ main] o.s.b.c.l.support.SimpleJobLauncher : Job: [FlowJob: [name=cloudClean]] completed with the following parameters: [{run.id=1}] and the following status: [COMPLETED]
2020-02-18 15:36:35.023 INFO 47168 --- [ Thread-2] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown initiated...
2020-02-18 15:36:35.030 INFO 47168 --- [ Thread-2] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown completed.

C:WorkDirRepositorySpringcwiki-us-spring-guidescwiki-us-spring-batch-examples>

请注意，在这里我们配置了

spring.batch.job.names=cloudClean

所以默认将会执行 cloudClean 作业。

或者你可以执行运行命令：

java -jar service/build/libs/service.jar --spring.batch.job.enabled=true --spring.batch.job.names=cloudClean

将会执行你指定的作业。