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Spring Batch - 如何将String从文件转换为Date?

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我正在尝试处理CSV文件,其中某些字段是 "yyyy-MM-dd" 格式的日期 - 但是当尝试将CSV文件中的字符串转换为模型类中的日期时,读取器失败 .

错误是:

org.springframework.validation.BindException:org.springframework.validation.BeanPropertyBindingResult:1 error字段'datetimeInactive'中对象'target'中的字段错误:被拒绝的值[2011-04-27];代码[typeMismatch.target.datetimeInactive,typeMismatch.datetimeInactive,typeMismatch.java.util.Date,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable:codes [target.datetimeInactive,datetimeInactive];参数[];默认消息[datetimeInactive]];默认消息[无法将类型'java.lang.String'的属性值转换为属性'datetimeInactive'的必需类型'java.util.Date';嵌套异常是java.lang.IllegalStateException:无法将类型[java.lang.String]的值转换为属性'datetimeInactive'所需的类型[java.util.Date]:找不到匹配的编辑器或转换策略]

读者的XML:

http://code.google.com/p/springbatch-in-action/source/browse/trunk/sbia/ch07/src/test/resources/com/manning/sbia/ch07/test-batch-reader-context.xml?r=145

在我的XML配置文件中,我有以下bean:

<bean id="dateEditor" class="org.springframework.beans.propertyeditors.CustomDateEditor">
    <constructor-arg>
      <bean class="java.text.SimpleDateFormat">
        <constructor-arg value="yyyy-MM-dd" />
      </bean>
    </constructor-arg>
    <constructor-arg value="true" />
  </bean>

  <bean class="org.springframework.beans.factory.config.CustomEditorConfigurer">
    <property name="customEditors">
      <map>
        <entry key="java.util.Date">
          <ref local="dateEditor" />
        </entry>
      </map>
    </property>
  </bean>

我的问题是:

UPDATE:

我得到了问题#2的答案:

XML:

<mvc:annotation-driven conversion-service="conversionService" />

  <bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean">
    <property name="converters">
        <set>
            <bean class="my.project.StringToDate">
                <!-- org.springframework.binding.convert.converters.StringToDate DEFAULT_PATTERN = "yyyy-MM-dd" -->
                <property name="pattern" value="yyyy-MM-dd" />
            </bean>
        </set>
    </property>
  </bean>

定制转换器:

package my.project;

import java.util.Date;

import org.springframework.core.convert.converter.Converter;

public class StringToDate extends org.springframework.binding.convert.converters.StringToDate implements Converter<String, Date> {

    public Date convert(String source) {

        Date date = null;

        try {
            date = (Date) convertSourceToTargetClass(getPattern(), getTargetClass());
        } catch (Exception e) {

        }

        return date;
    }

}

我仍在寻找问题#1的答案 . 即,在设置转换器之后,我仍然在批处理任务期间获得BindException . 从this forum thread开始,看起来我的代码应该执行了转换 .

堆栈跟踪是:

Caused by: org.springframework.validation.BindException: org.springframework.validation.BeanPropertyBindingResult: 2 errors
Field error in object 'target' on field 'datetimeInactive': rejected value [2011-04-27]; codes [typeMismatch.target.datetimeInactive,typeMismatch.datetimeInactive,typeMismatch.java.util.Date,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [target.datetimeInactive,datetimeInactive]; arguments []; default message [datetimeInactive]]; default message [Failed to convert property value of type 'java.lang.String' to required type 'java.util.Date' for property 'datetimeInactive'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [java.lang.String] to required type [java.util.Date] for property 'datetimeInactive': no matching editors or conversion strategy found]
Field error in object 'target' on field 'datetimeActive': rejected value [2011-04-27]; codes [typeMismatch.target.datetimeActive,typeMismatch.datetimeActive,typeMismatch.java.util.Date,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [target.datetimeActive,datetimeActive]; arguments []; default message [datetimeActive]]; default message [Failed to convert property value of type 'java.lang.String' to required type 'java.util.Date' for property 'datetimeActive'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [java.lang.String] to required type [java.util.Date] for property 'datetimeActive': no matching editors or conversion strategy found]
    at org.springframework.batch.item.file.mapping.BeanWrapperFieldSetMapper.mapFieldSet(BeanWrapperFieldSetMapper.java:186)
    at org.springframework.batch.item.file.mapping.DefaultLineMapper.mapLine(DefaultLineMapper.java:42)
    at org.springframework.batch.item.file.FlatFileItemReader.doRead(FlatFileItemReader.java:179)
    ... 45 more

1 回答

  • 3

    您的论坛参考用于构建应用程序上下文和配置bean时的类型转换

    看看_D55872_的JavaDoc

    要自定义FieldSet值转换为所需类型以便注入原型的方式,有几种选择 . 您可以通过customEditors 属性直接注入PropertyEditor实例,也可以覆盖createBinder(Object)和initBinder(DataBinder)方法,也可以提供自定义FieldSet实现 .

    这意味着您应该将CustomDateEditor直接注入Mapper

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