Spring Batch - 基于字段值的多个编写器 [英] Spring Batch - more than one writer based on field value

问题描述

我正在使用Spring批处理，对于当前使用FlatFileItemWriter的编写器。

I am working on spring batch, for writer currently using FlatFileItemWriter.

我想根据某些字段将输入文件内容写入多个平面文件值。 Spring批处理默认是支持任何类型的功能。[类似于CompositeItemWriter]

I would like to write my input file content to more than one flat file based on some field value. Is Spring batch support any kind of functionality by default.[something similar to CompositeItemWriter]

例如，我的输入文件内容是这样的。

For example, my input file content is something like this.

john,35,retail,10000
joe,34,homeloan,20000
Amy,23,retail,2000

现在我想基于第三列写两个不同的文件，这意味着第1行和第3行应该去file1和row2应该转到file2。

Now i would like to write two different files based on third column, it means row 1 and row 3 should go to file1 and row 2 should go to file2.

我的编写器配置是：

<bean id="fileWriter" class="org.springframework.batch.item.file.FlatFileItemWriter">

        <property name="resource" value="file:C:/output.dat"/>

        <property name="lineAggregator">
            <bean class="org.springframework.batch.item.file.transform.DelimitedLineAggregator">
                <property name="delimiter" value="|" />
                <property name="fieldExtractor">
                    <bean class="org.springframework.batch.item.file.transform.BeanWrapperFieldExtractor">
                        <property name="names" value="field1,field2...." />
                    </bean>
                </property>
            </bean>
        </property>
    </bean>

推荐答案

看看 ClassifierCompositeItemWriter 。这个 ItemWriter 实现允许你定义一个分类器，它选择哪个定义的委托 ItemWriter 委托的实例。在您的情况下，您将创建一个基于field4决定的分类器并将写入委托给 FlatFileItemWriter的适当实例。

Take a look at the ClassifierCompositeItemWriter. This ItemWriter implementation allows you to define a Classifier that chooses which of the defined delegate ItemWriter instances to delegate to. In your case, you'd create a Classifier that decided based on field4 and delegate the writing to the appropriate instance of the FlatFileItemWriter.

您可以在此处的文档中阅读有关 ClassifierCompositeItemWriter 的更多信息： http://docs.spring.io/spring-batch/ trunk / apidocs / org / springframework / batch / item / support / ClassifierCompositeItemWriter.html

You can read more about the ClassifierCompositeItemWriter in the documentation here: http://docs.spring.io/spring-batch/trunk/apidocs/org/springframework/batch/item/support/ClassifierCompositeItemWriter.html

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