SpringBatch-获取FieldSetMapper上的行号 [英] SpringBatch - Get Line Number on FieldSetMapper
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问题描述
我需要将行号放入FieldSet映射器。我如何才能做到这一点?
我要将lineNumber用作映射器生成的结果对象的字段。
<beans:bean id="fileReader" class="org.springframework.batch.item.file.FlatFileItemReader" scope="step">
<beans:property name="resource"
value="file:${batch.source}"/>
<beans:property name="lineMapper">
<beans:bean class="org.springframework.batch.item.file.mapping.DefaultLineMapper">
<beans:property name="lineTokenizer">
<beans:bean class="org.springframework.batch.item.file.transform.DelimitedLineTokenizer">
<beans:property name="delimiter" value="${batch.delimiter}"/>
<beans:property name="names" value="${batch.columns}"/>
</beans:bean>
</beans:property>
<beans:property name="fieldSetMapper">
<beans:bean class="my.batch.mapper.ResourceFieldSetMapper"/>
</beans:property>
</beans:bean>
</beans:property>
</beans:bean>
谢谢您。
推荐答案
我意识到,通过使用我自己的LineMapper覆盖DefaultLineMapper,可以将lineNumber值获取到MyObject中:
import org.springframework.batch.item.file.FlatFileParseException;
import org.springframework.batch.item.file.LineMapper;
import org.springframework.batch.item.file.transform.LineTokenizer;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.util.Assert;
import my.model.MyObject;
public class MyLineMapper<T> implements LineMapper<MyObject>, InitializingBean {
private LineTokenizer tokenizer;
private ResourceFieldSetMapper fieldSetMapper;
public MyObject mapLine(String line, int lineNumber) throws Exception {
try{
MyObject r = fieldSetMapper.mapFieldSet(tokenizer.tokenize(line));
// this is the modification
r.setLineNumber(lineNumber);
return r;
}
catch(Exception ex){
throw new FlatFileParseException("Parsing error at line: " + lineNumber +
", input=[" + line + "]", ex, line, lineNumber);
}
}
public void setLineTokenizer(LineTokenizer tokenizer) {
this.tokenizer = tokenizer;
}
public void setFieldSetMapper(ResourceFieldSetMapper fieldSetMapper) {
this.fieldSetMapper = fieldSetMapper;
}
public void afterPropertiesSet() {
Assert.notNull(tokenizer, "The LineTokenizer must be set");
Assert.notNull(fieldSetMapper, "The FieldSetMapper must be set");
}
}
谢谢您的帮助!我希望这对某人有用!
祝福!
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