我正在尝试在spring-batch中创建基于注释的ItemReader。我能够在我的xml中创建所需的ItemReader，但基于注释完全没有工作，给出以下错误：
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'runScheduler': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.springframework.batch.core.Job com.techavalanche.batch.RunScheduler.job; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'reportJob': Cannot create inner bean '(inner bean)#3f9bb1' of type [org.springframework.batch.core.configuration.xml.SimpleFlowFactoryBean] while setting bean property 'flow'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#3f9bb1': Cannot create inner bean '(inner bean)#17e6f05' of type [org.springframework.batch.core.job.flow.support.StateTransition] while setting bean property 'stateTransitions' with key [0]; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#17e6f05': Cannot create inner bean '(inner bean)#66da50' of type [org.springframework.batch.core.job.flow.support.state.StepState] while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#66da50': Cannot resolve reference to bean 'step1' while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'step1': Cannot resolve reference to bean 'customItemReader' while setting bean property 'itemReader'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'customItemReader': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: public org.springframework.batch.item.file.FlatFileItemReader com.techavalanche.reader.CustomReader.itemReader; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'getFlatFileItemReader' defined in class path resource [com/techavalanche/reader/CustomReader.class]: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: LineMapper is required
由以下原因引起：
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.springframework.batch.core.Job com.techavalanche.batch.RunScheduler.job; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'reportJob': Cannot create inner bean '(inner bean)#3f9bb1' of type [org.springframework.batch.core.configuration.xml.SimpleFlowFactoryBean] while setting bean property 'flow'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#3f9bb1': Cannot create inner bean '(inner bean)#17e6f05' of type [org.springframework.batch.core.job.flow.support.StateTransition] while setting bean property 'stateTransitions' with key [0]; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#17e6f05': Cannot create inner bean '(inner bean)#66da50' of type [org.springframework.batch.core.job.flow.support.state.StepState] while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#66da50': Cannot resolve reference to bean 'step1' while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'step1': Cannot resolve reference to bean 'customItemReader' while setting bean property 'itemReader'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'customItemReader': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: public org.springframework.batch.item.file.FlatFileItemReader com.techavalanche.reader.CustomReader.itemReader; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'getFlatFileItemReader' defined in class path resource [com/techavalanche/reader/CustomReader.class]: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: LineMapper is required
我的CustomReader是
package com.techavalanche.reader;
@Component("customReader")
public class CustomReader implements ItemReader<Report> {
@Autowired
public FlatFileItemReader<Report> itemReader;
@Bean
public FlatFileItemReader getFlatFileItemReader(){
return new FlatFileItemReader();
}
@Bean
public DefaultLineMapper getDefaultLineMapper(){
return new DefaultLineMapper();
}
@Autowired
public DefaultLineMapper<Report> lineMapper;
@Bean
public FixedLengthTokenizer getLinetokenizer(){
return new FixedLengthTokenizer();
}
@Autowired
public FixedLengthTokenizer linetokenizer;
@Bean
public BeanWrapperFieldSetMapper getBeanWrapperFieldSetMapper() {
return new BeanWrapperFieldSetMapper();
}
@Autowired
public BeanWrapperFieldSetMapper<Report> fieldSetMapper;
public Resource res=new FileSystemResource("D:\\testresource\\report.csv");
String[] names= {"date","impressions","clicks","earning"};
@Override
public Report read() throws Exception, UnexpectedInputException, ParseException,
NonTransientResourceException {
for(String name:names){
System.out.println(name);
}
linetokenizer.setNames(new String[] {"date","impressions","clicks","earning"});
Range range1=new Range(1,12);
Range range2=new Range(13,15);
Range range3=new Range(16,20);
Range range4=new Range(21,28);
Range[] ranges={range1,range2,range3,range4};
linetokenizer.setColumns(ranges);
lineMapper.setLineTokenizer(linetokenizer);
fieldSetMapper.setPrototypeBeanName("report");
lineMapper.setFieldSetMapper(fieldSetMapper);
itemReader.setResource(res);
itemReader.setLineMapper(lineMapper);
itemReader.open(new ExecutionContext());
Report report= itemReader.read();
return report;
}
}
我的Xml配置如下所示：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:batch="http://www.springframework.org/schema/batch"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:task="http://www.springframework.org/schema/task" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/batch
http://www.springframework.org/schema/batch/spring-batch-2.2.xsd
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.2.xsd
http://www.springframework.org/schema/task
http://www.springframework.org/schema/task/spring-task-3.2.xsd
">
<context:component-scan base-package="com.techavalanche" />
<bean id="jobRepository"
class="org.springframework.batch.core.repository.support.MapJobRepositoryFactoryBean">
<property name="transactionManager" ref="transactionManager" />
</bean>
<bean id="transactionManager"
class="org.springframework.batch.support.transaction.ResourcelessTransactionManager" />
<bean id="jobLauncher"
class="org.springframework.batch.core.launch.support.SimpleJobLauncher">
<property name="jobRepository" ref="jobRepository" />
</bean>
<bean id="report" class="com.techavalanche.batch.Report" scope="prototype" />
<bean id="customWriter" class="com.techavalanche.writer.CustomWriter" />
<batch:job id="reportJob">
<batch:step id="step1">
<batch:tasklet>
<batch:chunk reader="customItemReader" writer="customWriter"
commit-interval="2">
</batch:chunk>
</batch:tasklet>
</batch:step>
</batch:job>
<bean id="multiResourceReader"
class=" org.springframework.batch.item.file.MultiResourceItemReader">
<property name="resources" value="file:D:\testresource\report.csv" />
<property name="delegate" ref="cvsFileItemReader" />
</bean>
<bean id="customItemReader" class="com.techavalanche.reader.CustomReader" />
<bean id="cvsFileItemReader" class="org.springframework.batch.item.file.FlatFileItemReader">
<!-- Read a csv file -->
<!-- <property name="resource" ref="resource" /> -->
<property name="lineMapper">
<bean class="org.springframework.batch.item.file.mapping.DefaultLineMapper">
<!-- split it -->
<property name="lineTokenizer">
<bean id="fixedLengthLineTokenizer"
class="org.springframework.batch.item.file.transform.FixedLengthTokenizer">
<property name="names" value="date,impressions,clicks,earning" />
<property name="columns" value="1-12,13-15,16-20,21-28" />
</bean>
</property>
<property name="fieldSetMapper">
<!-- return back to reader, rather than a mapped object. -->
<!-- <bean class="org.springframework.batch.item.file.mapping.PassThroughFieldSetMapper"
/> -->
<!-- map to an object -->
<bean
class="org.springframework.batch.item.file.mapping.BeanWrapperFieldSetMapper">
<property name="prototypeBeanName" value="report" />
</bean>
</property>
</bean>
</property>
</bean>
</beans>