Java 如何为Spring批处理配置分配动态属性?
我有一个用例,需要动态地更改SpringBatch配置bean中的资源、列名、列的位置和其他内容。作业将从JobLauncher启动 我构建了以下内容:Java 如何为Spring批处理配置分配动态属性?,java,spring,spring-batch,Java,Spring,Spring Batch,我有一个用例,需要动态地更改SpringBatch配置bean中的资源、列名、列的位置和其他内容。作业将从JobLauncher启动 我构建了以下内容: @Configuration @EnableBatchProcessing public class BatchConfiguration { public JobBuilderFactory jobBuilderFactory; public StepBuilderFactory stepBuilderFactory;
@Configuration
@EnableBatchProcessing
public class BatchConfiguration {
public JobBuilderFactory jobBuilderFactory;
public StepBuilderFactory stepBuilderFactory;
//these are the properties i need to dynamically change
private String[] names;
private Resource inputResource;
private String[] positions;
private String tableName;
private String columnNames;
private String values;
@Autowired
public void setJobBuilderFactory(JobBuilderFactory jobBuilderFactory) {
this.jobBuilderFactory = jobBuilderFactory;
}
@Autowired
public void setStepBuilderFactory(StepBuilderFactory stepBuilderFactory) {
this.stepBuilderFactory = stepBuilderFactory;
}
@Bean
BatchConfigurer configurer(@Qualifier("prestagingJpaDataSource") DataSource dataSource){
return new DefaultBatchConfigurer(dataSource);
}
@Bean
public FlatFileItemReader<String[]> reader() {
return new FlatFileItemReaderBuilder<String[]>()
.name("hacReader")
//put file here
.resource(inputResource)
.lineMapper(new DefaultLineMapper<String[]>() {{
setLineTokenizer(new DelimitedLineTokenizer() {{
//put column names here
setNames(names);
}});
//put column positions here
setFieldSetMapper(fieldSet -> positions);
}})
.build();
}
//this is obviously wrong, as i would need to use an ItemPreparedStatementSetter
@Bean
public JdbcBatchItemWriter<String[]> writer(DataSource dataSource) {
return new JdbcBatchItemWriterBuilder<String[]>()
.itemSqlParameterSourceProvider(new BeanPropertyItemSqlParameterSourceProvider<>())
.sql("INSERT INTO " + tableName + " (" + columnsNames + ") VALUES (" + values)
.dataSource(dataSource)
.build();
}
@Bean
public Job importUserJob(JobCompletionNotificationListener listener, Step step1) {
return jobBuilderFactory.get("importUserJob")
.incrementer(new RunIdIncrementer())
.listener(listener)
.flow(step1)
.end()
.build();
}
@Bean
public Step step1(JdbcBatchItemWriter<String[]> writer) {
return stepBuilderFactory.get("step1")
.<String[], String[]> chunk(10)
.reader(reader())
//.processor(processor())
.writer(writer)
.build();
}
}
Spring Batch是否可以实现类似的功能?这些属性总是不同的,所以我绝对不能有任何硬编码的值
如果是,那么我需要做什么才能使它们工作?您可以通过将这些属性作为作业参数传递来实现这一点,在本例中,这些属性最好作为非标识作业参数传递,并在运行时将其传递到读卡器中。以下是一个例子:
@Bean
@StepScope
public ItemReader<String[]> itemReader(
@Value("#{jobParameters['fileName']}") String fileName,
@Value("#{jobParameters['columnNames']}") String columnNames
) {
return new FlatFileItemReaderBuilder<String[]>()
.name("hacReader")
//put file here
.resource(new FileSystemResource(fileName))
.lineMapper(new DefaultLineMapper<String[]>() {{
setLineTokenizer(new DelimitedLineTokenizer() {{
//put column names here
setNames(columnNames.split(","));
}});
}})
.build();
}
希望这有帮助
JobParameters jobParameters = new JobParametersBuilder()
.addString("fileName", "/path/to/input/file")
.addString("columnNames", "column1,column2,column5")
.toJobParameters();