将作业参数传递给自定义编写器 Spring 批处理 [英] pass job parameters to custom writer Spring batch
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问题描述
我有一个带有 FlatFileItemWriter 的自定义编写器,我想传递在主类中定义的作业参数(输出文件)我该如何处理?非常感谢
I have a custom writer with a FlatFileItemWriter and i want to pass a job parameter( a output file) defined in the main class How can i deal with this ? Thank you very much
自定义编写器
public class PersonItemWriter implements ItemWriter<Person> {
private FlatFileItemWriter<String> flatFileItemWriter = new FlatFileItemWriter<String>();
private Resource resource;
@Override
public void write(List<? extends Person> personList) throws Exception {
flatFileItemWriter.setResource(new FileSystemResource(resource.getFile()));
PassThroughLineAggregator<String> aggregator = new PassThroughLineAggregator<String();
flatFileItemWriter.setLineAggregator(aggregator);
flatFileItemWriter.open(new ExecutionContext());
flatFileItemWriter.write(Arrays.asList(aggregator.aggregate("test")));
flatFileItemWriter.close();
}
public void setResource(Resource resource) {
this.resource = resource;
}
}
启动器
JobLauncher jobLauncher = (JobLauncher) applicationContext.getBean("jobLauncher");
Job job = (Job) applicationContext.getBean("personJob");
/* Parameters sent to job */
JobParametersBuilder jobParametersBuilder = new JobParametersBuilder();
jobParametersBuilder.addString("outputFileName", "file:" + personFile); // pass this to the itemWriter
配置作业xml
<bean id="personWriter" class="com.dev.writer.PersonItemWriter" scope="step>
<property name="resource" value="#{jobParameters[outputFileName]}" />
</bean>
推荐答案
您必须使用 step scope 或 job scope 声明 bean,以便您可以进行后期绑定基于作业参数的属性:
You have to declare the bean with either step scope or job scope so you can have late binding of a property based on the job parameter:
<bean id="personWriter" class="com.dev.writer.PersonItemWriter" scope="step">
<property name="resource" value="#{jobParameters[outputFileName]}" />
</bean>
默认情况下这些范围不可用,您需要通过使用 batch
命名空间或定义以下 bean 来包含它们:
These scopes are not available by default, you need to include them either by either using the batch
namespace or defining the following bean:
<bean class="org.springframework.batch.core.scope.StepScope" />
更新:
这是完整的作者:
public class PersonItemWriter implements ItemWriter<Person> {
FlatFileItemWriter<String> flatFileItemWriter = new FlatFileItemWriter<String>();
private Resource resource;
@Override
public void write(List<? extends Person> personList) throws Exception {
flatFileItemWriter.setResource(resource);// how the pass the job parameter file here
PassThroughLineAggregator<String> aggregator = new PassThroughLineAggregator<String();
flatFileItemWriter.setLineAggregator(aggregator);
aggregator.aggregate("test"); // do not save in output file
}
public FlatFileItemWriter<String> getFlatFileItemWriter() {
return flatFileItemWriter;
}
public void setFlatFileItemWriter(FlatFileItemWriter<String> flatFileItemWriter) {
this.flatFileItemWriter = flatFileItemWriter;
}
public void setResource(Resource resource) {
this.resource = resource;
}
}
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