我有一个用例,我需要动态更改资源,列名,列的位置以及弹簧批处理配置bean中的其他内容。作业将从JobLauncher
启动。
我已经构造了以下内容:
@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();
}
}
春季批处理有可能这样做吗?这些属性会始终变化,因此我绝对不能具有任何硬编码的值。
如果是,那么我需要做什么才能使它们起作用?
您可以通过将这些属性作为作业参数传递(在这种情况下最好将这些属性作为非识别工作参数传递给(,并在运行时在读者中固定它们。这是一个示例:
@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();
}
使用此设置,将使用指定为作业参数的fileName
和columnNames
动态配置阅读器:
JobParameters jobParameters = new JobParametersBuilder()
.addString("fileName", "/path/to/input/file")
.addString("columnNames", "column1,column2,column5")
.toJobParameters();
希望这会有所帮助。