我目前正在编写Spring批处理,在此处读取XML数据并对其进行处理,然后将处理器结果作为map<string,object>
传递给writer并实现CompositeItemWriter。以下是必需的输出XML。Spring批处理将文件写入多个目标
<Company att1="value">
<employees>
<employee></employee>
<employee></employee>
<employee></employee>
<employees>
</Company>
生成用于编组和解组的JAXB xjc类。 JAXB生成的类如下所示。
@XmlRootElement(name="Company")
public class Company{
@XmlElements(name="employees" required="true")
}
JAXB Employee类
@XmlRootElement(name="employees")
public class Employees
{
@XmlElement(name="Employee")
protected List<Employees> employee;
}
Spring XML配置文件
<batch:job id="reportJob">
<batch:step id="step1">
<batch:tasklet>
<batch:chunk reader="xmlItemReader"
writer="compositeItemWriter" processor="filterReportProcessor"
commit-interval="2">
</batch:chunk>
</batch:tasklet>
</batch:step>
</batch:job>
<!-- Filtering process -->
<bean id="filterReportProcessor" class="com.examples.FilterReportProcessor" />
<bean id="xmlItemReader"
class="org.springframework.batch.item.xml.StaxEventItemReader">
<property name="fragmentRootElementName" value="record" />
<property name="resource" value="classpath:xml/company.xml" />
<property name="unmarshaller" ref="reportUnmarshaller" />
</bean>
<!-- Read and map values to object, via jaxb2 -->
<bean id="reportUnmarshaller" class="org.springframework.oxm.jaxb.Jaxb2Marshaller">
<property name="classesToBeBound">
<list>
<value>com.examples.Company</value>
<value>com.examples.Employees</value>
<value>com.examples.Employee</value>
</list>
</property>
</bean>
<bean id="compositeItemWriter" class="org.springframework.batch.item.support.CompositeItemWriter">
<property name="delegates"/>
<list>
<ref bean="testXMlWriter">
</list>
</bean>
<bean id="testXMlWriter" class="com.test.example.TestXMLWriter">
处理器和作家:
public class FilterReportProcessor
implement ItemProcessor<Employee,Map<String,Object>>{
public Map<String,Object> process(Employee emplpyee) throws Exception{
Map<String,Object> evnt = Mapper.crateMapping(emplpyee);
return event;
}
public class TestXMLWriter implemtes ItemWriter(Map<String,Object>){
write(List <? extends Map<String, object>> lst){
Employee e1 = new Employee();
e1.setxxx(mapelementdata.item());
Employees employs = new Employees();
employs.add(e1);
Comapany c1 = new Company();
c1.add(employs);
Marshaller m = context.createMarshaller();
m.marshal(c1, resource.getFile());
}
问:
XML文件覆盖每个固定提交间隔,显而易见的是,XML文件中的每个提交级后,会创建。但我必须将所有<employee>
对象附加到同一个XML文件。如何实现这个逻辑在每个提交时间间隔后追加<employee>
对象?
是什么问题? – Pooya
如何在同一批处理步骤中添加新的xml记录。 – vanreddy
修改问题并转贴 – vanreddy