我的项目有这个要求,用户上传一个必须推送到mysql数据库的CSV文件。我知道我们可以使用Spring批处理大量记录。但是我无法找到我的这个要求的任何教程/示例代码。我遇到的所有教程都只是硬编码了CSV文件名,如下所示:
https://spring.io/guides/gs/batch-processing/
我需要使用用户上传的文件并进行相应的处理。这里的任何帮助将不胜感激..
如果没有使用Spring批处理,是否有其他方法可以将上传的CSV数据插入mysql?
答案 0 :(得分:3)
请将此作为主要参考:http://walkingtechie.blogspot.co.uk/2017/03/spring-batch-csv-file-to-mysql.html 这解释了如何使用Batch将CSV文件导入MySQL数据库。
但是,正如您所说,所有示例都假定硬编码文件不是您想要的。
在下面的代码中,重要位(与我提供的链接中的示例不同)是控制器,它采用多部分文件并将其保存在临时文件夹中。 然后将文件名作为参数传递给Job:
JobExecution jobExecution = jobLauncher.run(importUserJob, new JobParametersBuilder()
.addString("fullPathFileName", fileToImport.getAbsolutePath())
.toJobParameters());
最后,importReader使用param fullPathFileName加载用户上传的文件:
@Bean
public FlatFileItemReader<Person> importReader(@Value("#{jobParameters[fullPathFileName]}") String pathToFile) {
FlatFileItemReader<Person> reader = new FlatFileItemReader<>();
reader.setResource(new FileSystemResource(pathToFile));
这里给出了一个完整的代码(未经测试,但它有大部分组件):
@Configuration
@EnableBatchProcessing
public class BatchConfig{
@Bean
public ResourcelessTransactionManager batchTransactionManager(){
ResourcelessTransactionManager transactionManager = new ResourcelessTransactionManager();
return transactionManager;
}
@Bean
protected JobRepository jobRepository(ResourcelessTransactionManager batchTransactionManager) throws Exception{
MapJobRepositoryFactoryBean jobRepository = new MapJobRepositoryFactoryBean();
jobRepository.setTransactionManager(batchTransactionManager);
return (JobRepository)jobRepository.getObject();
}
@Bean
public JobLauncher jobLauncher(JobRepository jobRepository) throws Exception {
SimpleJobLauncher jobLauncher = new SimpleJobLauncher();
jobLauncher.setJobRepository(jobRepository);
return jobLauncher;
}
}
@Configuration
public class ImportJobConfig {
@Bean
public FlatFileItemReader<Person> importReader(@Value("#{jobParameters[fullPathFileName]}") String pathToFile) {
FlatFileItemReader<Person> reader = new FlatFileItemReader<>();
reader.setResource(new FileSystemResource(pathToFile));
reader.setLineMapper(new DefaultLineMapper<Person>() {{
setLineTokenizer(new DelimitedLineTokenizer() {{
setNames(new String[]{"firstName", "lastName"});
}});
setFieldSetMapper(new BeanWrapperFieldSetMapper<Person>() {{
setTargetType(Person.class);
}});
}});
return reader;
}
@Bean
public PersonItemProcessor processor() {
return new PersonItemProcessor();
}
@Bean
public JdbcBatchItemWriter<Person> writer() {
JdbcBatchItemWriter<Person> writer = new JdbcBatchItemWriter<>();
writer.setItemSqlParameterSourceProvider(
new BeanPropertyItemSqlParameterSourceProvider<Person>());
writer.setSql("INSERT INTO people (first_name, last_name) VALUES (:firstName, :lastName)");
writer.setDataSource(dataSource);
return writer;
}
// end::readerwriterprocessor[]
// tag::jobstep[]
@Bean
public Job importUserJob(JobCompletionNotificationListener listener) {
return jobBuilderFactory.get("importUserJob").incrementer(new RunIdIncrementer())
.listener(listener).flow(step1()).end().build();
}
@Bean
public Step step1(@Qualifier("importReader") ItemReader<Person> importReader) {
return stepBuilderFactory.get("step1").<Person, Person>chunk(10).reader(importReader)
.processor(processor()).writer(writer()).build();
}
}
@RestController
public class MyImportController {
@Autowired private JobLauncher jobLauncher;
@Autowired private Job importUserJob;
@RequestMapping(value="/import/file", method=RequestMethod.POST)
public String create(@RequestParam("file") MultipartFile multipartFile) throws IOException{
//Save multipartFile file in a temporary physical folder
String path = new ClassPathResource("tmpuploads/").getURL().getPath();//it's assumed you have a folder called tmpuploads in the resources folder
File fileToImport = new File(path + multipartFile.getOriginalFilename());
OutputStream outputStream = new FileOutputStream(fileToImport);
IOUtils.copy(multipartFile.getInputStream(), outputStream);
outputStream.flush();
outputStream.close();
//Launch the Batch Job
JobExecution jobExecution = jobLauncher.run(importUserJob, new JobParametersBuilder()
.addString("fullPathFileName", fileToImport.getAbsolutePath())
.toJobParameters());
return "OK";
}
}
答案 1 :(得分:0)
我是通过混合使用Spring MVC(RestController)和Spring Batch来实现的。 Spring MVC帮助将csv文件作为多部分请求上传。然后我通过将上传的CSV传递给Spring Job来异步调用Spring批处理。一旦Spring作业收到csv文件,它就会通过读取,处理和写入DB作业来进行弹簧批处理。