如何使用spring-boot在spring批处理中设置JobParameters

Question

@Configuration
@EnableBatchProcessing
public class MyBatchConfiguration {

    // other beans ommited

    @Bean 
    public Resource destFile(@Value("#{jobParameters[dest]}") String dest) {
        return new FileSystemResource(dest);
    }

}

mvn clean package

java my-jarfile.jar dest=/tmp/foo

我得到一个例外说：

[...]
Caused by: org.springframework.expression.spel.SpelEvaluationException: 
EL1008E:(pos 0): Field or property 'jobParameters' cannot be found on object of 
type 'org.springframework.beans.factory.config.BeanExpressionContext'

谢谢！

Answer 1

从命令行解析作业参数，然后创建和填充作业参数。

public JobParameters getJobParameters() {
    JobParametersBuilder jobParametersBuilder = new JobParametersBuilder();
    jobParametersBuilder.addString("dest", <dest_from_cmd_line);
    jobParametersBuilder.addDate("date", <date_from_cmd_line>);
    return jobParametersBuilder.toJobParameters();
}

通过JobLauncher将它们传递给你的工作-

JobLauncher jobLauncher = context.getBean(JobLauncher.class);
JobExecution jobExecution = jobLauncher.run(job, jobParameters);

现在您可以使用类似的代码访问它们-

@Bean 
@StepScope
public Resource destFile(@Value("#{jobParameters[dest]}") String dest) {
    return new FileSystemResource(dest);
}

@Bean
@StepScope
public JdbcCursorItemReader<MyPojo> reader(@Value("#{jobParameters}") Map jobParameters) {
    return new MyReaderHelper.getReader(jobParameters);
}