定长文件（二十七）"/>
Spring Batch之读数据—读定长文件（二十七）
一、定长文件
Spring Batch之读数据—Flat格式文件（二十四）_人……杰的博客-CSDN博客_flat文件
二、项目实例
1.项目框架
2.代码实现
(1)BatchMain.java:
package com.xj.demo20;import org.springframework.batch.core.Job;
import org.springframework.batch.core.JobExecution;
import org.springframework.batch.core.JobParameters;
import org.springframework.batch.core.launch.JobLauncher;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;/*** @Author : xjfu* @Date : 2021/10/26 20:01* @Description : demo20 读取定长文件的启动类*/
public class BatchMain {public static void main(String[] args) {ApplicationContext context = new ClassPathXmlApplicationContext("demo20/job/demo20-job.xml");//Spring Batch的作业启动器,JobLauncher launcher = (JobLauncher) context.getBean("jobLauncher");//在batch.xml中配置的一个作业Job job = (Job)context.getBean("billJob");try{//开始执行这个作业,获得处理结果(要运行的job,job参数对象)JobExecution result = launcher.run(job, new JobParameters());System.out.println(result.toString());}catch (Exception e){e.printStackTrace();}}
}
(2)CreditBill.java:
package com.xj.demo20;/*** @Author : xjfu* @Date : 2021/10/26 19:27* @Description :*/
public class CreditBill {//银行卡账户IDprivate String accountID = "";//持卡人姓名private String name = "";//消费金额private double amount = 0;//消费日期private String date = "";//消费场所private String address = "";public String getAccountID() {return accountID;}public void setAccountID(String accountID) {this.accountID = accountID;}public String getName() {return name;}public void setName(String name) {this.name = name;}public double getAmount() {return amount;}public void setAmount(double amount) {this.amount = amount;}public String getDate() {return date;}public void setDate(String date) {this.date = date;}public String getAddress() {return address;}public void setAddress(String address) {this.address = address;}@Overridepublic String toString() {return this.accountID + "," + this.name + "," + this.amount + "," + this.date + "," + this.address;}
}
(3)CreditBillProcessor.java:
package com.xj.demo20;import org.springframework.batch.item.ItemProcessor;public class CreditBillProcessor implementsItemProcessor<CreditBill, CreditBill> {public CreditBill process(CreditBill bill) throws Exception {System.out.println(bill.toString());return bill;}
}
(4)demo20-job.xml:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns=""xmlns:xsi="" xmlns:batch=""xsi:schemaLocation=" .xsd .xsd"><!--导入文件--><import resource="classpath:demo20/job/demo20-jobContext.xml"/><!--定义名字为billJob的作业--><batch:job id="billJob"><!--定义名字为billStep的作业步--><batch:step id="billStep"><batch:tasklet transaction-manager="transactionManager"><!--定义读、处理、写操作，规定每处理两条数据，进行一次写入操作，这样可以提高写的效率--><batch:chunk reader="csvItemReader" processor="creditBillProcessor" writer="csvItemWriter" commit-interval="2"/></batch:tasklet></batch:step></batch:job>
</beans>(5)demo20-jobContext.xml:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns=""xmlns:xsi=""xsi:schemaLocation=" .xsd"><!--定义作业仓库 Job执行期间的元数据存储在内存中--><bean id="jobRepository" class="org.springframework.batch.core.repository.support.MapJobRepositoryFactoryBean"></bean><!--定义作业调度器，用来启动job--><bean id="jobLauncher" class="org.springframework.batch.core.launch.support.SimpleJobLauncher"><!--注入jobRepository--><property name="jobRepository" ref="jobRepository"/></bean><!--定义事务管理器，用于Spring Batch框架中对数据操作提供事务能力--><bean id="transactionManager" class="org.springframework.batch.support.transaction.ResourcelessTransactionManager"/><!--读取信用卡账单文件，CSV 格式--><!--使用FlatFileItemReader读文本文件--><bean id="csvItemReader" class="org.springframework.batch.item.file.FlatFileItemReader" scope="step"><!--指定读取的资源文件--><property name="resource" value="classpath:demo20/data/demo20-fixedLengthFile.csv"/><!--通过lineMapper把文本中的一行转换为领域对象creditBill--><property name="lineMapper" ref="fixedLengthLineMapper"/></bean><bean id="fixedLengthLineMapper" class="org.springframework.batch.item.file.mapping.DefaultLineMapper"><property name="lineTokenizer" ref="fixedLengthLineTokenizer"/><property name="fieldSetMapper" ref="creditBillBeanWrapperFieldSetMapper"/></bean><bean id="fixedLengthLineTokenizer" class="org.springframework.batch.item.file.transform.FixedLengthTokenizer"><!--定义每个字段的长度--><property name="columns" value="1-16,17-26,27-34,35-53,54-72"/><!--定义字段映射的名字--><property name="names" value="accountID,name,amount,date,address"/></bean><bean id="creditBillBeanWrapperFieldSetMapper" class="org.springframework.batch.item.file.mapping.BeanWrapperFieldSetMapper"><!--指定了映射的Java Bean对象，即CreditBill--><property name="prototypeBeanName" value="creditBill"/></bean><bean id="creditBillProcessor" class="com.xj.demo20.CreditBillProcessor" scope="step"/><!--注入实体类--><bean id="creditBill" class="com.xj.demo20.CreditBill" scope="prototype"/><!--写信用卡账单文件，CSV格式--><bean id="csvItemWriter" class="org.springframework.batch.item.file.FlatFileItemWriter" scope="step"><!--要写入的文件位置,因为[classpath:]不是一个具体的目录,这里应当用[file:](从项目根目录开始)指明输出位置--><property name="resource" value="file:src/main/resources/demo20/data/demo20-outputFile.csv"/><!--[lineAggregator成员]指明行聚合器,用来将对象输出到文件时构造文件中的每行的格式--><property name="lineAggregator"><!--这里使用Spring Batch自带的DelimitedLineAggregator来作为行聚合器(可以拼接一个个属性形成行)--><bean class="org.springframework.batch.item.file.transform.DelimitedLineAggregator"><!--使用","拼接--><property name="delimiter" value=","/><!--fieldExtractor成员用来将Java类的属性组成的数组拼接成行字符串--><property name="fieldExtractor"><bean class="org.springframework.batch.item.file.transform.BeanWrapperFieldExtractor"><property name="names" value="accountID,name,amount,date,address"></property></bean></property></bean></property></bean>
</beans>(6)demo20-fixedLengthFile.csv:
4041390012345678tom 00100.002013-02-02 12:00:08 Lu Jia Zui road
4042390012345678tom 00320.002013-02-03 10:35:21 Lu Jia Zui road
4043390012345678jerry 00674.702013-02-06 16:26:49 South Linyi road
4044390012345678rose 00793.202013-02-09 15:15:37 Longyang road
4045390012345678bruce 00360.002013-02-11 11:12:38 Longyang road
4046390012345678rachle 00893.002013-02-28 20:34:19 Hunan road3.运行结果
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Spring Batch之读数据—读定长文件（二十七）
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