一、需求分析

使用Spring Batch对XML文件进行读写操作: 从一个xml文件中读取商品信息, 经过简单的处理, 写入另外一个xml文件中.

二、代码实现

1. 代码结构图:

2. applicationContext.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:p="http://www.springframework.org/schema/p"  xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop"  xmlns:context="http://www.springframework.org/schema/context"  xsi:schemaLocation="http://www.springframework.org/schema/beans    http://www.springframework.org/schema/beans/spring-beans-3.1.xsd    http://www.springframework.org/schema/tx    http://www.springframework.org/schema/tx/spring-tx-3.1.xsd    http://www.springframework.org/schema/aop    http://www.springframework.org/schema/aop/spring-aop-3.1.xsd    http://www.springframework.org/schema/context    http://www.springframework.org/schema/context/spring-context-3.1.xsd"  default-autowire="byName">  <!-- auto scan path -->  <context:component-scan base-package="com.zdp" />  <bean id="jobLauncher" class="org.springframework.batch.core.launch.support.SimpleJobLauncher">    <property name="jobRepository" ref="jobRepository" />  </bean>  <bean id="jobRepository" class="org.springframework.batch.core.repository.support.MapJobRepositoryFactoryBean" />  <bean id="transactionManager" class="org.springframework.batch.support.transaction.ResourcelessTransactionManager" /></beans>

base-package: 扫描spring注解

jobLauncher: 启动Job

jobRepository: 为Job提供持久化操作

transactionManager: 提供事务管理操作

3. springBatch.xml

<?xml version="1.0" encoding="UTF-8"?><bean:beans xmlns="http://www.springframework.org/schema/batch"  xmlns:bean="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  xmlns:p="http://www.springframework.org/schema/p" xmlns:tx="http://www.springframework.org/schema/tx"  xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"  xmlns:util="http://www.springframework.org/schema/util"  xsi:schemaLocation="http://www.springframework.org/schema/beans   http://www.springframework.org/schema/beans/spring-beans-3.1.xsd    http://www.springframework.org/schema/tx   http://www.springframework.org/schema/tx/spring-tx-3.1.xsd    http://www.springframework.org/schema/aop   http://www.springframework.org/schema/aop/spring-aop-3.1.xsd    http://www.springframework.org/schema/context   http://www.springframework.org/schema/context/spring-context-3.1.xsd  http://www.springframework.org/schema/batch   http://www.springframework.org/schema/batch/spring-batch-2.1.xsd   http://www.springframework.org/schema/util   http://www.springframework.org/schema/util/spring-util.xsd">  <bean:import resource="applicationContext.xml" />  <job id="xmlFileReadAndWriterJob">    <step id="xmlFileReadAndWriterStep">      <tasklet>        <chunk reader="xmlReader" writer="xmlWriter" processor="xmlProcessor" commit-interval="10" />      </tasklet>    </step>  </job>  <!-- XML文件读取 -->  <bean:bean id="xmlReader" class="org.springframework.batch.item.xml.StaxEventItemReader" scope="step">    <bean:property name="fragmentRootElementName" value=http://www.mamicode.com/"product" />    <bean:property name="unmarshaller" ref="tradeMarshaller" />    <bean:property name="resource" value=http://www.mamicode.com/"file:#{jobParameters[‘inputFilePath‘]}" />  </bean:bean>  <!-- XML文件写入 -->  <bean:bean id="xmlWriter" class="org.springframework.batch.item.xml.StaxEventItemWriter" scope="step">    <bean:property name="rootTagName" value=http://www.mamicode.com/"zdp" />    <bean:property name="marshaller" ref="tradeMarshaller" />    <bean:property name="resource" value=http://www.mamicode.com/"file:#{jobParameters[‘outputFilePath‘]}" />  </bean:bean>  <bean:bean id="tradeMarshaller" class="org.springframework.oxm.xstream.XStreamMarshaller">    <bean:property name="aliases">      <util:map id="aliases">        <bean:entry key="product" value=http://www.mamicode.com/"com.zdp.domain.Product" />        <bean:entry key="buyDate" value=http://www.mamicode.com/"java.util.Date" />      </util:map>    </bean:property>  </bean:bean></bean:beans>

1. Job包含一个Step，Step中包含了基本的读(xmlReader)，处理(xmlProcessor)，写(xmlWriter)。

2. xmlReader配置了xml读操作, resource属性是指定文件路径信息的。知道了文件路径 。 fragmentRootElementName属性是指定根节点名称的.  unmarshaller负责完成解析节点信息，并映射成程序pojo对象。

3. tradeMarshaller为解析xml节点, 其中entry的key指定对应根节点名称product，value指定程序的pojo类，这样，程序就可以将product节点下的子节点与pojo类(P roduct )中的属性去匹配，当匹配到子节点名与pojo类中的属性名相同时，就会将子节点的内容赋值给pojo类的属性。这样就完成了一个根节点的读取，框架会控制循环操作，直到将文件中所有根( product )节点全部读完为止。这样就完成了XML文件的读操作。

4. xmlWriter配置了对XML文件的写操作。resource属性提供文件的路径信息。同时，也是需要知道这个文件的跟节点信息的，rootTagName属性提供根节点名信息。marshaller 把pojo对象转换成XML片段的工具。本文读操作的unmarshaller和写操作的marshaller用的是同一个转换器，因为XStreamMarshaller既提供将节点片段转换为pojo对象功能，同时又提供将pojo对象持久化为xml文件的功能。

4. XMLProcessor

/** * XML文件处理类。 */@Component("xmlProcessor")public class XMLProcessor implements ItemProcessor<Product, Product> {  // XML文件内容处理  @Override  public Product process(Product product) throws Exception {    product.setBuyDate(new Date());    product.setCustomer(product.getCustomer() + "顾客!");    product.setId(product.getId() + "_1");    product.setPrice(product.getPrice() + 1000.0);    product.setQuantity(product.getQuantity() + 100);    return product;  }}

5. Product

/** * 实体产品类 */public class Product {  private String id;  private int quantity; // 数量  private double price; // 价格  private String customer; // 顾客  private Date buyDate; // 日期}

6. JobLaunch

/** * Test client */public class JobLaunch {  public static void main(String[] args) {    ApplicationContext context = new ClassPathXmlApplicationContext("springBatch.xml");    JobLauncher jobLauncher = (JobLauncher) context.getBean("jobLauncher");    Job job = (Job) context.getBean("xmlFileReadAndWriterJob");    try {      jobLauncher.run(job, new JobParametersBuilder().addString("inputFilePath", "d:\\input.xml")                               .addString("outputFilePath", "d:\\output.xml")                               .toJobParameters());    } catch (Exception e) {      e.printStackTrace();    }  }}

7. input.xml

8.  output.xml

http://www.tuicool.com/articles/NNZbYv3

http://www.dineshonjava.com/2014/03/spring-batch-xml-to-mongodb-database.html http://stackoverflow.com/questions/26462952/how-to-extract-data-from-multiple-xml-files-and-put-it-in-one-xml-file-in-spring?rq=1 http://www.dineshonjava.com/2014/03/spring-batch-xml-to-mongodb-database.html

mutiple: http://www.dineshonjava.com/2014/03/multiresourceitemreader-in-spring-batch.html

override reader http://stackoverflow.com/questions/17448541/multiresourceitemreader-with-a-custom-delegate-keeps-reading-the-same-file

Spirng_Batch