如何在没有项目编写器的情况下编写春季批处理步骤 [英] How to write a spring batch step without an itemwriter

问题描述

我正在尝试使用以下配置在没有项目编写器的情况下配置春季批处理步骤.但是我说那个作家时出错 元素既没有'writer'属性，也没有元素.

I am trying to configure a spring batch step without an item writer using below configuraion. However i get error saying that writer element has neither a 'writer' attribute nor a element.

我浏览了链接 spring batch:没有ItemWriter的Tasklet .但是无法解决问题. 谁能告诉我我提到的代码段中要进行的具体更改

I went through the link spring batch : Tasklet without ItemWriter. But could not resolve issue. Could any one tell me the specific changes to be made in the code snippet I mentioned

<batch:job id="helloWorldJob">
        <batch:step id="step1">
            <batch:tasklet>
                <batch:chunk reader="cvsFileItemReader"
                    commit-interval="10">
                </batch:chunk>
            </batch:tasklet>
        </batch:step>
    </batch:job>

    <bean id="cvsFileItemReader" class="org.springframework.batch.item.file.FlatFileItemReader">

        <property name="resource" value="classpath:cvs/input/report.csv" />

        <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="id,sales,qty,staffName,date" />
                    </bean>
                </property>
                <property name="fieldSetMapper">
                    <bean class="com.mkyong.ReportFieldSetMapper" />

                    <!-- if no data type conversion, use BeanWrapperFieldSetMapper to map by name
                    <bean
                        class="org.springframework.batch.item.file.mapping.BeanWrapperFieldSetMapper">
                        <property name="prototypeBeanName" value="report" />
                    </bean>
                     -->
                </property>
            </bean>
        </property>

    </bean>

推荐答案

对于基于块的步骤，读写器是必需的.
如果您不希望编写者使用不执行任何操作的No-operation ItemWriter.

For chunk-based step reader and writer are mandatory.
If you don't want a writer use a No-operation ItemWriter that does nothing.

无操作实现是接口的空实现，它什么也没有做！
只需让您的类使用空方法实现理想的接口即可.

A no-op implementation is an empty implementation of interface tha does...nothing!
Just let your class implements desiderable inteface(s) with empty methods.

无操作ItemWriter:

No-op ItemWriter:

public class NoOpItemWriter implements ItemWriter {
  void write(java.util.List<? extends T> items) throws java.lang.Exception {
    // no-op
  }
}

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