spring-batch - @BeforeStep 注释的方法没有被调用

Question

我正在写一个 Spring 批处理作业。但是在加载这个实现tasklet接口(interface)的Archive类时，注释@BeforeStep下的方法不会被调用。谁能帮我这个 ？
谢谢你

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.StandardCopyOption;
import java.util.Calendar;
import java.util.Locale;
import java.util.TimeZone;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

import org.springframework.batch.core.JobExecution;
import org.springframework.batch.core.StepContribution;
import org.springframework.batch.core.StepExecution;
import org.springframework.batch.core.annotation.BeforeStep;
import org.springframework.batch.core.scope.context.ChunkContext;
import org.springframework.batch.core.step.tasklet.Tasklet;
import org.springframework.batch.item.ExecutionContext;
import org.springframework.batch.repeat.RepeatStatus;


    public class Archive implements Tasklet{
        @Override
        public RepeatStatus execute(StepContribution arg0, ChunkContext arg1)
                throws Exception {

            System.out.println("in execute method :)");
            return RepeatStatus.FINISHED;
        }

        @BeforeStep
        public void retrieveInterstepData(StepExecution stepExecution){
            JobExecution jobExecution = stepExecution.getJobExecution();
            ExecutionContext jobContext = jobExecution.getExecutionContext();

        }
    }

Answer 1

第一种解决方案可以提取ExecutionContext来自 execute您拥有的方法ChunkContext并随心所欲地使用它。

ExecutionContext jobContext = chunkContext.getStepContext()
                                    .getStepExecution()
                                    .getJobExecution()
                                    .getExecutionContext();

第二种解决方案可以执行 StepExecutionListener并覆盖 beforeStep方法。你会有类似的东西:

public class Archive implements Tasklet, StepExecutionListener{
    @Override
    public RepeatStatus execute(StepContribution arg0, ChunkContext arg1)
                throws Exception {
        System.out.println("in execute method :)");
        return RepeatStatus.FINISHED;
    }

    @Override
    public void beforeStep(final StepExecution stepExecution) {
        JobExecution jobExecution = stepExecution.getJobExecution();
        ExecutionContext jobContext = jobExecution.getExecutionContext();
    }
}

我有一个类似的问题，我们像这样克服了它。至于为什么 @BeforeStep不在 tasklet 上调用，但在 readers 内, processors和 writers我不确定。