java 如何使用 spring-batch 和 MultiResourceItemReader 读取文件夹中的所有文件？
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How to read all files in a folder with spring-batch and MultiResourceItemReader?
提问by membersound
I want to configure spring-batchto read all csvfiles inside a specific folder sequentially.
我想配置spring-batch为csv按顺序读取特定文件夹中的所有文件。
The following does not work because the delegate will try to open a file named *.csv, which of course is invalid. What do I have to change here?
以下不起作用，因为委托将尝试打开名为 的文件*.csv，这当然是无效的。我在这里需要改变什么？
@Bean
public ItemReader<String> reader() {
MultiResourceItemReader<String> reader = new MultiResourceItemReader<>();
reader.setResources(new Resource[] {new FileSystemResource("/myfolder/*.csv")});
reader.setDelegate(new FlatFileItemReader<>(..));
return reader;
}
The equivalent xml configuration would be written as follows, how could I rewrite it to java only config?
等效的 xml 配置将写成如下，我如何将其重写为 java only config？
<bean id="reader" class="org.springframework.batch.item.file.MultiResourceItemReader">
<property name="resources" value="/mypfolder/*.csv"/>
<property name="delegate" ref="flatFileItemReader"/>
</bean>
采纳答案by Luca Basso Ricci
I think you should use a PathMatchingResourcePatternResolver.
我认为你应该使用PathMatchingResourcePatternResolver.
回答by Tharindu Jayasuriya
Use PathMatchingResourcePatternResolver like this.
像这样使用 PathMatchingResourcePatternResolver。
@Bean
public ItemReader<String> reader() {
Resource[] resources = null;
ResourcePatternResolver patternResolver = new PathMatchingResourcePatternResolver();
try {
resources = patternResolver.getResources("/myfolder/*.csv");
} catch (IOException e) {
e.printStackTrace();
}
MultiResourceItemReader<String> reader = new MultiResourceItemReader<>();
reader.setResources(resources);
reader.setDelegate(new FlatFileItemReader<>(..));
return reader;
}
}
回答by Ihar Zhavarankau
Alternatively @Value annotation can be used to let ResourceArrayPropertyEditor convert string to Resource[].
或者，@Value 注释可用于让 ResourceArrayPropertyEditor 将字符串转换为 Resource[]。
@Bean
@StepScope
public ItemReader<String> reader(
@Value("file:/myfolder/*.csv") Resource[] resources
) {
MultiResourceItemReader<String> reader = new MultiResourceItemReader<>();
reader.setResources(resources);
reader.setDelegate(new FlatFileItemReader<>(..));
return reader;
}
回答by Niraj Sonawane
Read multiple files from Absolute file path:
从绝对文件路径读取多个文件：
@Bean
public MultiResourceItemReader<POJO> multiResourceItemReader() {
MultiResourceItemReader<POJO> resourceItemReader = new MultiResourceItemReader<POJO>();
ClassLoader cl = this.getClass().getClassLoader();
ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver(cl);
Resource[] resources = resolver.getResources("file:" + filePath );
resourceItemReader.setResources(resources);
resourceItemReader.setDelegate(reader());
return resourceItemReader;
}
@Bean
public FlatFileItemReader<POJO> reader() {
FlatFileItemReader<POJO> reader = new FlatFileItemReader<POJO>();
reader.setLineMapper(new DefaultLineMapper() {{
setLineTokenizer(new DelimitedLineTokenizer() {{
setNames(new String[]{"id1", "POJO"});
}});
setFieldSetMapper(new BeanWrapperFieldSetMapper<POJO>() {{
setTargetType(POJO.class);
}});
}});
return reader;
}
