我正在使用spring批处理来读取CSV文件,并使用控制器触发器将其写入DB。启动应用程序时,在启动浏览器URL之前,我会在启动时看到来自阅读器的打印语句。尽管它不为我的处理器或编写器打印它,但它们在我自动接线的单独的类中。是因为读者是菜豆吗?
在应用程序启动的日志中,我从FlatFileItemReader
中看到了打印语句。但是,当我点击控制器URL时,只会在控制台中显示处理器和编写器的打印语句。
我尝试在spring.batch.job.enabled=false
文件中添加application.properties
,但是它不会停止执行阅读器bean。如何防止SpringBatchConfig类中的阅读器bean自动执行:
SpringBatchConfig类:
@Configuration
@EnableBatchProcessing
public class SpringBatchConfig {
@Autowired
private JobBuilderFactory jobBuilderFactory;
@Autowired
private StepBuilderFactory stepBuilderFactory;
@Autowired
private DataSource dataSource;
@Autowired
private DBWriter writer1;
@Autowired
private Processor processor1;
//Step 1 - CSV to DB
@Bean
public FlatFileItemReader<User> itemReader() {
FlatFileItemReader<User> flatFileItemReader = new FlatFileItemReader<>();
flatFileItemReader.setResource(new FileSystemResource("src/main/resources/users.csv"));
flatFileItemReader.setName("CSV-Reader");
flatFileItemReader.setLinesToSkip(1);
flatFileItemReader.setLineMapper(lineMapper());
System.out.println("inside file reader 1 !!!!!");
return flatFileItemReader;
}
@Bean
public LineMapper<User> lineMapper() {
DefaultLineMapper<User> defaultLineMapper = new DefaultLineMapper<>();
DelimitedLineTokenizer lineTokenizer = new DelimitedLineTokenizer();
lineTokenizer.setDelimiter(",");
lineTokenizer.setStrict(false);
lineTokenizer.setNames(new String[]{"id", "name", "dept", "salary"});
BeanWrapperFieldSetMapper<User> fieldSetMapper = new BeanWrapperFieldSetMapper<>();
fieldSetMapper.setTargetType(User.class);
defaultLineMapper.setLineTokenizer(lineTokenizer);
defaultLineMapper.setFieldSetMapper(fieldSetMapper);
return defaultLineMapper;
}
@Bean
public Step step1() throws Exception{ // Step 1 - Read CSV and Write to DB
return stepBuilderFactory.get("step1")
.<User,User>chunk(100)
.reader(itemReader())
.processor(processor1)
.writer(writer1)
.build();
}
@Bean
public Job job() throws Exception{
return this.jobBuilderFactory.get("BATCH JOB")
.incrementer(new RunIdIncrementer())
.start(step1())
.build();
}
DBWriter类:
@Component
public class DBWriter implements ItemWriter<User> {
@Autowired
private UserRepository userRepository;
@Override
public void write(List<? extends User> users) throws Exception {
System.out.println("Inside DB Writer");
System.out.println("Data Saved for Users: " + users);
userRepository.save(users);
}
}
处理器类:
@Component
public class Processor implements ItemProcessor<User, User> {
private static final Map<String, String> DEPT_NAMES =
new HashMap<>();
public Processor() {
DEPT_NAMES.put("001", "Technology");
DEPT_NAMES.put("002", "Operations");
DEPT_NAMES.put("003", "Accounts");
}
@Override
public User process(User user) throws Exception {
String deptCode = user.getDept();
String dept = DEPT_NAMES.get(deptCode);
user.setDept(dept);
user.setTime(new Date());
System.out.println(String.format("Converted from [%s] to [%s]", deptCode, dept));
return user;
}
}
控制器类:
@RestController
@RequestMapping("/load")
public class LoadController {
@Autowired
JobLauncher jobLauncher;
@Autowired
Job job;
@GetMapping("/users")
public BatchStatus load() throws JobParametersInvalidException, JobExecutionAlreadyRunningException, JobRestartException, JobInstanceAlreadyCompleteException {
Map<String, JobParameter> maps = new HashMap<>();
maps.put("time", new JobParameter(System.currentTimeMillis()));
JobParameters parameters = new JobParameters(maps);
JobExecution jobExecution = jobLauncher.run(job, parameters);
System.out.println("JobExecution: " + jobExecution.getStatus());
System.out.println("Batch is Running...");
while (jobExecution.isRunning()) {
System.out.println("...");
}
return jobExecution.getStatus();
}
}
答案 0 :(得分:1)
spring.batch.job.enabled=false
属性用于防止在应用程序启动时运行作业。
在配置时仍会调用创建阅读器的方法,因此看到打印语句是正常的。但这并不意味着读者在正在运行的工作中被召唤。