[英]Spring batch FlatFileItemWriter write as csv from Object
[英]Spring batch FlatFileItemWriter - Showing exponential value in csv after writing it
我有一个 Spring 批处理应用程序,它从 mysql 数据库读取数据并将其写入 csv 文件。
问题:当我看到 csv 中的数据时遇到的问题,一些大数字显示为指数值。 例如,对于这个数字“4491611100277480” ,它显示为“4.49161E+15”
下面是我正在使用的代码片段
// Job
@Bean
public Job databaseToCsvJob() {
return jobBuilderFactory.get("databaseToCsvJob").incrementer(new RunIdIncrementer())
// .listener(listener)
.start(databaseToCsvJob_step()).build();
}
// Step
@Bean
public Step databaseToCsvJob_step() {
return stepBuilderFactory.get("databaseToCsvJob_step").<Person, Person>chunk(1000).reader(personReader())
.writer(personWriter()).build();
}
// Reader
@Bean
public JdbcCursorItemReader<Person> personReader() {
JdbcCursorItemReader<Person> reader = new JdbcCursorItemReader<>();
reader.setSql("select empCode , empName , profileName, ID from profile");
reader.setDataSource(mysqlDataSource);
reader.setRowMapper(personRowmapper());
return reader;
}
// Writer
@Bean
public FlatFileItemWriter<Person> personWriter() {
// Create writer instance
FlatFileItemWriter<Person> writer = new FlatFileItemWriter<>();
// Set output file location
writer.setResource(new FileSystemResource("src/main/resources/people-data.csv"));
// All job repetitions should "append" to same output file
writer.setAppendAllowed(true);
// Name field values sequence based on object properties
writer.setLineAggregator(new DelimitedLineAggregator<Person>() {
{
setDelimiter(",");
setFieldExtractor(new BeanWrapperFieldExtractor<Person>() {
{
setNames(new String[] { "empCode", "empName", "profileName", "id" });
}
});
}
});
return writer;
}
当您使用 double 作为数据类型时会发生这种情况。 将其更改为 long ,它应该可以正常工作。
如果由于某种原因它必须保持双倍,您可以在提取过程中转换该值:
new BeanWrapperFieldExtractor<Person>() {
{
setNames(new String[] { "empCode", "empName", "profileName", "id" });
}
public Object[] extract(Person person) {
return new Object[] { person.getEmpCode(), person.getEmpName(), person.getProfileName(), ((long) person.getId()) };
}
}
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