这是我收到的错误。
Caused by: java.lang.IllegalStateException: Cannot convert value of type [code.ProductFieldSetMapper] to required type [org.springframework.batch.item.file.mapping.FieldSetMapper] for property 'FieldSetMapper': no matching editors or conversion strategy found
at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:264)
at org.springframework.beans.BeanWrapperImpl.convertIfNecessary(BeanWrapperImpl.java:450)
... 23 more
这是我的上下文文件 (FileReaderConfig.xml)
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:batch="http://www.springframework.org/schema/batch"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/batch
http://www.springframework.org/schema/batch/spring-batch.xsd">
<bean id="reader" class="org.springframework.batch.item.file.FlatFileItemReader">
<property name="resource" value="file:./output.txt" />
<property name="linesToSkip" value="1" />
<property name="lineMapper">
<bean class="org.springframework.batch.item.file.mapping.DefaultLineMapper">
<property name="lineTokenizer">
<bean
class="org.springframework.batch.item.file.transform.DelimitedLineTokenizer">
<property name="names" value="PRODUCT_ID,NAME,DESCRIPTION,PRICE" />
</bean>
</property>
<property name="fieldSetMapper">
<bean class="code.ProductFieldSetMapper" />
</property>
</bean>
</property>
</bean>
<job id="importProducts" xmlns="http://www.springframework.org/schema/batch">
<step id="readWriteProducts">
<tasklet>
<chunk reader="reader" writer="writer" commit-interval="100" />
</tasklet>
</step>
</job>
这是接口(interface)(FieldSetMapper.java) 封装代码;
import org.springframework.batch.item.file.transform.FieldSet;
import org.springframework.validation.BindException;
public interface FieldSetMapper<T> {
T mapFieldSet(FieldSet fieldSet) throws BindException;
}
这是 ProductFieldSetMapper.java
package code;
import org.springframework.batch.item.file.transform.FieldSet;
import org.springframework.validation.BindException;
public class ProductFieldSetMapper implements FieldSetMapper<Product> {
public Product mapFieldSet(FieldSet fieldSet) throws BindException {
// TODO Auto-generated method stub
Product product = new Product();
product.setId(fieldSet.readString("PRODUCT_ID"));
product.setName(fieldSet.readString("NAME"));
product.setDescription(fieldSet.readString("DESCRIPTION"));
product.setPrice(fieldSet.readBigDecimal("PRICE"));
return product;
}
}
这是我正在运行的类(Runner.java) 封装代码;
import org.omg.PortableInterceptor.SYSTEM_EXCEPTION;
import org.springframework.batch.item.file.transform.FieldSet;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.validation.BindException;
public class Runner {
public static void main(String[] args) throws BeansException, BindException {
// TODO Auto-generated method stub
Product product;
ApplicationContext context =
new ClassPathXmlApplicationContext("FileReaderConfig.xml");
ProductFieldSetMapper obj = (ProductFieldSetMapper) context.getBean("FieldSetMapper");
product = (Product) obj.mapFieldSet((FieldSet)context.getBean("lineTokenizer"));
System.out.println(product.getDescription() + ""+product.getId()+""+product.getName());
}
}
我不明白我的代码在哪里(或者为什么)尝试将 ProductFieldSetMapper 转换为 FieldSetMapper(这只是一个接口(interface),我知道这不起作用)。
顺便说一句,Product.java 是一个带有变量及其各自的 setter 和 getter 的 POJO。
最佳答案
该错误是由于我使用自己的接口(interface)而不是 Spring 提供的接口(interface)造成的。我删除了接口(interface)类,并在导入后让 ProductFieldSetMapper 实现 org.springframework.batch.item.file.mapping.FieldSetMapper 。这解决了问题。
关于java - 非法状态异常 : Cannot convert value of type to required type,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/22389235/