在spring-boot批处理FlatFileItemReader中读取csv文件时，有什么方法可以验证字段长度？ 我尝试了javax.validation并在pojo中设置了最小和最大长度，但不知道如何触发验证。
答案 0 :(得分：2)
我在这里用READ.me创建了一个示例。
我重写FlatItemReader，然后使用Hibernate Validator在下面的Reader级别执行Bean验证
public class SimpleReader extends FlatFileItemReader<SoccerTeam> {
private Validator factory = Validation.buildDefaultValidatorFactory().getValidator();
@Override
public SoccerTeam doRead() throws Exception {
SoccerTeam soccerTeam = super.doRead();
if (Objects.isNull(soccerTeam)) return null;
Set<ConstraintViolation<SoccerTeam>> violations = this.factory.validate(soccerTeam);
if (!violations.isEmpty()) {
System.out.println(violations);
String errorMsg = String.format("The input has validation failed. Data is '%s'", soccerTeam);
throw new FlatFileParseException(errorMsg, Objects.toString(soccerTeam));
}
else {
return soccerTeam;
}
}
}
该模型正在使用验证注释
package com.bigzidane.example.springbatch;
import javax.validation.constraints.Max;
import javax.validation.constraints.Min;
import javax.validation.constraints.Size;
public class SoccerTeam {
@Size(max = 60)
private String name;
private String national;
@Min(value = 1)
@Max(value = 100)
private int rank;
public void setName(String name) {
this.name = name;
}
public void setNational(String national) {
this.national = national;
}
public void setRank(int rank) {
this.rank = rank;
}
@Override
public String toString() {
return "SoccerTeam{" +
"name='" + name + '\'' +
", national='" + national + '\'' +
", rank='" + rank + '\'' +
'}';
}
}
有关完整代码，请查看here
示例在本地运行 输入为
name,national,rank
real madrid,spain,100
ars,english,1
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.1.9.RELEASE)
2019-10-05 14:41:27.754 INFO 10912 --- [ main] c.b.example.springbatch.HelloBatch : Starting HelloBatch on WINDOWS-ESDA5FC with PID 10912 (C:\Users\dotha\IdeaProjects\spring-boot-batch\target\classes started by dotha in C:\Users\dotha\IdeaProjects\spring-boot-batch)
2019-10-05 14:41:27.760 INFO 10912 --- [ main] c.b.example.springbatch.HelloBatch : No active profile set, falling back to default profiles: default
2019-10-05 14:41:28.985 INFO 10912 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2019-10-05 14:41:29.232 INFO 10912 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2019-10-05 14:41:29.383 INFO 10912 --- [ main] o.s.b.c.r.s.JobRepositoryFactoryBean : No database type set, using meta data indicating: H2
2019-10-05 14:41:29.684 INFO 10912 --- [ main] o.s.b.c.l.support.SimpleJobLauncher : No TaskExecutor has been set, defaulting to synchronous executor.
2019-10-05 14:41:29.934 INFO 10912 --- [ main] c.b.example.springbatch.HelloBatch : Started HelloBatch in 2.643 seconds (JVM running for 3.269)
2019-10-05 14:41:29.936 INFO 10912 --- [ main] o.s.b.a.b.JobLauncherCommandLineRunner : Running default command line with: []
2019-10-05 14:41:30.035 INFO 10912 --- [ main] o.s.b.c.l.support.SimpleJobLauncher : Job: [FlowJob: [name=processJob]] launched with the following parameters: [{run.id=1}]
2019-10-05 14:41:30.066 INFO 10912 --- [ main] o.s.batch.core.job.SimpleStepHandler : Executing step: [step1]
SoccerTeam{name='real madrid', national='spain', rank='100'}
SoccerTeam{name='ars', national='english', rank='1'}
2019-10-05 14:41:30.220 INFO 10912 --- [ main] o.s.b.c.l.support.SimpleJobLauncher : Job: [FlowJob: [name=processJob]] completed with the following parameters: [{run.id=1}] and the following status: [COMPLETED]
2019-10-05 14:41:30.225 INFO 10912 --- [ Thread-2] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown initiated...
2019-10-05 14:41:30.227 INFO 10912 --- [ Thread-2] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown completed.
现在，如果输入的验证失败 输入为
name,national,rank
real madrid,spain,101
ars,english,1
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.1.9.RELEASE)
2019-10-05 14:42:37.757 INFO 11268 --- [ main] c.b.example.springbatch.HelloBatch : Starting HelloBatch on WINDOWS-ESDA5FC with PID 11268 (C:\Users\dotha\IdeaProjects\spring-boot-batch\target\classes started by dotha in C:\Users\dotha\IdeaProjects\spring-boot-batch)
2019-10-05 14:42:37.761 INFO 11268 --- [ main] c.b.example.springbatch.HelloBatch : No active profile set, falling back to default profiles: default
2019-10-05 14:42:39.319 INFO 11268 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2019-10-05 14:42:39.648 INFO 11268 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2019-10-05 14:42:39.798 INFO 11268 --- [ main] o.s.b.c.r.s.JobRepositoryFactoryBean : No database type set, using meta data indicating: H2
2019-10-05 14:42:40.101 INFO 11268 --- [ main] o.s.b.c.l.support.SimpleJobLauncher : No TaskExecutor has been set, defaulting to synchronous executor.
2019-10-05 14:42:40.372 INFO 11268 --- [ main] c.b.example.springbatch.HelloBatch : Started HelloBatch in 3.231 seconds (JVM running for 3.89)
2019-10-05 14:42:40.374 INFO 11268 --- [ main] o.s.b.a.b.JobLauncherCommandLineRunner : Running default command line with: []
2019-10-05 14:42:40.524 INFO 11268 --- [ main] o.s.b.c.l.support.SimpleJobLauncher : Job: [FlowJob: [name=processJob]] launched with the following parameters: [{run.id=1}]
2019-10-05 14:42:40.559 INFO 11268 --- [ main] o.s.batch.core.job.SimpleStepHandler : Executing step: [step1]
[ConstraintViolationImpl{interpolatedMessage='must be less than or equal to 100', propertyPath=rank, rootBeanClass=class com.bigzidane.example.springbatch.SoccerTeam, messageTemplate='{javax.validation.constraints.Max.message}'}]
2019-10-05 14:42:40.746 ERROR 11268 --- [ main] o.s.batch.core.step.AbstractStep : Encountered an error executing step step1 in job processJob
org.springframework.batch.item.file.FlatFileParseException: The input has validation failed. Data is 'SoccerTeam{name='real madrid', national='spain', rank='101'}'
at com.bigzidane.example.springbatch.SimpleReader.doRead(SimpleReader.java:25) ~[classes/:na]
at com.bigzidane.example.springbatch.SimpleReader.doRead(SimpleReader.java:12) ~[classes/:na]
at org.springframework.batch.item.support.AbstractItemCountingItemStreamItemReader.read(AbstractItemCountingItemStreamItemReader.java:92) ~[spring-batch-infrastructure-4.1.2.RELEASE.jar:4.1.2.RELEASE]
at org.springframework.batch.core.step.item.SimpleChunkProvider.doRead(SimpleChunkProvider.java:94) ~[spring-batch-core-4.1.2.RELEASE.jar:4.1.2.RELEASE]
at org.springframework.batch.core.step.item.SimpleChunkProvider.read(SimpleChunkProvider.java:161) ~[spring-batch-core-4.1.2.RELEASE.jar:4.1.2.RELEASE]
at org.springframework.batch.core.step.item.SimpleChunkProvider$1.doInIteration(SimpleChunkProvider.java:119) ~[spring-batch-core-4.1.2.RELEASE.jar:4.1.2.RELEASE]
at org.springframework.batch.repeat.support.RepeatTemplate.getNextResult(RepeatTemplate.java:375) ~[spring-batch-infrastructure-4.1.2.RELEASE.jar:4.1.2.RELEASE]
at org.springframework.batch.repeat.support.RepeatTemplate.executeInternal(RepeatTemplate.java:215) ~[spring-batch-infrastructure-4.1.2.RELEASE.jar:4.1.2.RELEASE]
at org.springframework.batch.repeat.support.RepeatTemplate.iterate(RepeatTemplate.java:145) ~[spring-batch-infrastructure-4.1.2.RELEASE.jar:4.1.2.RELEASE]
at org.springframework.batch.core.step.item.SimpleChunkProvider.provide(SimpleChunkProvider.java:113) ~[spring-batch-core-4.1.2.RELEASE.jar:4.1.2.RELEASE]
at org.springframework.batch.core.step.item.ChunkOrientedTasklet.execute(ChunkOrientedTasklet.java:69) ~[spring-batch-core-4.1.2.RELEASE.jar:4.1.2.RELEASE]
at org.springframework.batch.core.step.tasklet.TaskletStep$ChunkTransactionCallback.doInTransaction(TaskletStep.java:407) ~[spring-batch-core-4.1.2.RELEASE.jar:4.1.2.RELEASE]
at org.springframework.batch.core.step.tasklet.TaskletStep$ChunkTransactionCallback.doInTransaction(TaskletStep.java:331) ~[spring-batch-core-4.1.2.RELEASE.jar:4.1.2.RELEASE]
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:140) ~[spring-tx-5.1.10.RELEASE.jar:5.1.10.RELEASE]
at org.springframework.batch.core.step.tasklet.TaskletStep$2.doInChunkContext(TaskletStep.java:273) ~[spring-batch-core-4.1.2.RELEASE.jar:4.1.2.RELEASE]
at org.springframework.batch.core.scope.context.StepContextRepeatCallback.doInIteration(StepContextRepeatCallback.java:82) ~[spring-batch-core-4.1.2.RELEASE.jar:4.1.2.RELEASE]
at org.springframework.batch.repeat.support.RepeatTemplate.getNextResult(RepeatTemplate.java:375) ~[spring-batch-infrastructure-4.1.2.RELEASE.jar:4.1.2.RELEASE]
at org.springframework.batch.repeat.support.RepeatTemplate.executeInternal(RepeatTemplate.java:215) ~[spring-batch-infrastructure-4.1.2.RELEASE.jar:4.1.2.RELEASE]
at org.springframework.batch.repeat.support.RepeatTemplate.iterate(RepeatTemplate.java:145) ~[spring-batch-infrastructure-4.1.2.RELEASE.jar:4.1.2.RELEASE]
at org.springframework.batch.core.step.tasklet.TaskletStep.doExecute(TaskletStep.java:258) ~[spring-batch-core-4.1.2.RELEASE.jar:4.1.2.RELEASE]
at org.springframework.batch.core.step.AbstractStep.execute(AbstractStep.java:203) ~[spring-batch-core-4.1.2.RELEASE.jar:4.1.2.RELEASE]
at org.springframework.batch.core.job.SimpleStepHandler.handleStep(SimpleStepHandler.java:148) [spring-batch-core-4.1.2.RELEASE.jar:4.1.2.RELEASE]
at org.springframework.batch.core.job.flow.JobFlowExecutor.executeStep(JobFlowExecutor.java:68) [spring-batch-core-4.1.2.RELEASE.jar:4.1.2.RELEASE]
at org.springframework.batch.core.job.flow.support.state.StepState.handle(StepState.java:67) [spring-batch-core-4.1.2.RELEASE.jar:4.1.2.RELEASE]
at org.springframework.batch.core.job.flow.support.SimpleFlow.resume(SimpleFlow.java:169) [spring-batch-core-4.1.2.RELEASE.jar:4.1.2.RELEASE]
at org.springframework.batch.core.job.flow.support.SimpleFlow.start(SimpleFlow.java:144) [spring-batch-core-4.1.2.RELEASE.jar:4.1.2.RELEASE]
at org.springframework.batch.core.job.flow.FlowJob.doExecute(FlowJob.java:136) [spring-batch-core-4.1.2.RELEASE.jar:4.1.2.RELEASE]
at org.springframework.batch.core.job.AbstractJob.execute(AbstractJob.java:313) [spring-batch-core-4.1.2.RELEASE.jar:4.1.2.RELEASE]
at org.springframework.batch.core.launch.support.SimpleJobLauncher$1.run(SimpleJobLauncher.java:144) [spring-batch-core-4.1.2.RELEASE.jar:4.1.2.RELEASE]
at org.springframework.core.task.SyncTaskExecutor.execute(SyncTaskExecutor.java:50) [spring-core-5.1.10.RELEASE.jar:5.1.10.RELEASE]
at org.springframework.batch.core.launch.support.SimpleJobLauncher.run(SimpleJobLauncher.java:137) [spring-batch-core-4.1.2.RELEASE.jar:4.1.2.RELEASE]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_161]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_161]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_161]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_161]
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:343) [spring-aop-5.1.10.RELEASE.jar:5.1.10.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:198) [spring-aop-5.1.10.RELEASE.jar:5.1.10.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) [spring-aop-5.1.10.RELEASE.jar:5.1.10.RELEASE]
at org.springframework.batch.core.configuration.annotation.SimpleBatchConfiguration$PassthruAdvice.invoke(SimpleBatchConfiguration.java:127) [spring-batch-core-4.1.2.RELEASE.jar:4.1.2.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) [spring-aop-5.1.10.RELEASE.jar:5.1.10.RELEASE]
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212) [spring-aop-5.1.10.RELEASE.jar:5.1.10.RELEASE]
at com.sun.proxy.$Proxy44.run(Unknown Source) [na:na]
at org.springframework.boot.autoconfigure.batch.JobLauncherCommandLineRunner.execute(JobLauncherCommandLineRunner.java:207) [spring-boot-autoconfigure-2.1.9.RELEASE.jar:2.1.9.RELEASE]
at org.springframework.boot.autoconfigure.batch.JobLauncherCommandLineRunner.executeLocalJobs(JobLauncherCommandLineRunner.java:181) [spring-boot-autoconfigure-2.1.9.RELEASE.jar:2.1.9.RELEASE]
at org.springframework.boot.autoconfigure.batch.JobLauncherCommandLineRunner.launchJobFromProperties(JobLauncherCommandLineRunner.java:168) [spring-boot-autoconfigure-2.1.9.RELEASE.jar:2.1.9.RELEASE]
at org.springframework.boot.autoconfigure.batch.JobLauncherCommandLineRunner.run(JobLauncherCommandLineRunner.java:163) [spring-boot-autoconfigure-2.1.9.RELEASE.jar:2.1.9.RELEASE]
at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:781) [spring-boot-2.1.9.RELEASE.jar:2.1.9.RELEASE]
at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:765) [spring-boot-2.1.9.RELEASE.jar:2.1.9.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:319) [spring-boot-2.1.9.RELEASE.jar:2.1.9.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) [spring-boot-2.1.9.RELEASE.jar:2.1.9.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1204) [spring-boot-2.1.9.RELEASE.jar:2.1.9.RELEASE]
at com.bigzidane.example.springbatch.HelloBatch.main(HelloBatch.java:9) [classes/:na]
2019-10-05 14:42:40.759 INFO 11268 --- [ main] o.s.b.c.l.support.SimpleJobLauncher : Job: [FlowJob: [name=processJob]] completed with the following parameters: [{run.id=1}] and the following status: [FAILED]
2019-10-05 14:42:40.764 INFO 11268 --- [ Thread-2] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown initiated...
2019-10-05 14:42:40.768 INFO 11268 --- [ Thread-2] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown completed.
Process finished with exit code 0
答案 1 :(得分：0)
如果要在阅读器级别执行验证，可以使用ItemReadListener或通过覆盖FlatFileItemReader并在doRead中调用验证逻辑，如@Nghia Do所示。
项目validation是项目处理器的典型用例。如果您使用Spring Batch 4.1+，则可以在面向块的步骤中使用BeanValidatingItemProcessor。您可以在此处找到示例：https://docs.spring.io/spring-batch/4.1.x/reference/html/whatsnew.html#whatsNewBeanValidationApi