Spring-Batch：如何在Spring Batch中的异常记录上返回自定义退出代码

Question

我有一个春季批处理任务，在输入文件中我有很少的记录，一些记录是有效的，而一些记录是无效的。在有效记录上，它应该写入输出文件，对于无效的记录，它应该写入错误文件，但有一些例外问题是当将某些东西写入错误文件时，它应该将退出代码设置为3.我尝试了很多方法，但无法设置退出代码，甚至在发生异常时终止该记录的实例。所以它不叫作家。

Answer 1

You probably don't want to use an exception here. As a general rule of thumb, it's best to avoid using exceptions for expected business logic. Instead, consider simply using your ItemProcessor to return a GoodObject (or the original item) if the record is valid and a BadObject if the record is invalid.

Then, leverage a ClassifierCompositeItemWriter to send the good records to one file ItemWriter and the bad ones to the error file ItemWriter .

Finally, there are a number of ways of determining whether or not any "bad" records are encountered. One simple way would be to put a class-level boolean in your ItemProcessor and then leverage the StepExecutionListener afterStep hook to check the flag and set the ExitCode .

public class ValidatingItemProcessor implements ItemProcessor<Input, AbstractItem>, StepExecutionListener {

    private boolean itemFailed = false;

    @Override
    public AbstractItem process(final Input item) throws Exception {
        if (item.isValid()) {
            return new GoodItem();
        }
        itemFailed = true;
        return new BadItem();
    }

    @Override
    public void beforeStep(final StepExecution stepExecution) {
        //no-op
    }

    @Override
    public ExitStatus afterStep(final StepExecution stepExecution) {
        if (itemFailed) {
            return new ExitStatus("3");
        }
        return null;
    }
}