Multi-File Input
在单个 Step 中处理多个文件是一个常见需求。假设所有文件都具有相同的格式，则 MultiResourceItemReader 支持 XML 和平面文件处理的这种输入类型。考虑目录中的以下文件：
It is a common requirement to process multiple files within a single Step. Assuming the
files all have the same formatting, the MultiResourceItemReader supports this type of
input for both XML and flat file processing. Consider the following files in a directory:
file-1.txt file-2.txt ignored.txt
file-1.txt 和 file-2.txt 的格式相同，出于业务原因，应将它们一起处理。可以使用 MultiResourceItemReader 通过使用通配符来读取这两个文件。
file-1.txt and file-2.txt are formatted the same and, for business reasons, should be
processed together. The MultiResourceItemReader can be used to read in both files by
using wildcards.
- Java
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以下示例显示如何在 Java 中读取带通配符的文件：
The following example shows how to read files with wildcards in Java:
@Bean
public MultiResourceItemReader multiResourceReader() {
return new MultiResourceItemReaderBuilder<Foo>()
.delegate(flatFileItemReader())
.resources(resources())
.build();
}- XML
-
以下示例显示如何在 XML 中读取带通配符的文件：
The following example shows how to read files with wildcards in XML:
<bean id="multiResourceReader" class="org.spr...MultiResourceItemReader">
<property name="resources" value="classpath:data/input/file-*.txt" />
<property name="delegate" ref="flatFileItemReader" />
</bean>引用的委托是简单的 FlatFileItemReader。上述配置从两个文件读取输入，处理回滚和重新启动场景。需要注意的是，与任何 ItemReader 一样，添加额外的输入（在本例中是一个文件）可能会在重新启动时引起潜在问题。建议批处理作业使用自己的单独目录，直到成功完成。
The referenced delegate is a simple FlatFileItemReader. The above configuration reads
input from both files, handling rollback and restart scenarios. It should be noted that,
as with any ItemReader, adding extra input (in this case a file) could cause potential
issues when restarting. It is recommended that batch jobs work with their own individual
directories until completed successfully.
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输入资源按 |
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Input resources are ordered by using |