spring Batch是一个基于Spring的企业级批处理框架，它通过配合定时器Quartz来轻易实现大批量的数据读取或插入，并且全程自动化，无需人员管理。
在使用spring batch之前，得对spring batch的流程有一个基本了解
每个batch它都包含了一个job，而一个job中却有可能包含多个step，整个batch中干活的是step，batch主要是用来对数据的操作，所以step就有三个操作数据的东西，一个是ItemReader用来读取数据的，一个是ItemProcessor用来处理数据的，一个是ItemWriter用来写数据（可以是文件也可以是插入sql语句），JobLauncher用来启动Job，JobRepository是上述处理提供的一种持久化机制，它为JobLauncher，Job，和Step实例提供CRUD操作。
pom.xml 三个batch的jar包
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<dependency> <groupId>org.springframework</groupId> <artifactId>spring-batch-core</artifactId> <version>2.1.8.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-batch-infrastructure</artifactId> <version>2.1.8.RELEASE</version> <dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-batch-test</artifactId> <version>2.1.8.RELEASE</version> </dependency> |
batch.xml
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<beans xmlns="http://www.springframework.org/schema/beans" xmlns:batch="http://www.springframework.org/schema/batch" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/batch http://www.springframework.org/schema/batch/spring-batch-2.1.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd "> <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"> <property name="validateTransactionState" value="false" /> </bean> <!--一个job--> <batch:job id="writerteacherInterview"> <batch:step id="teacherInterview"> <batch:tasklet> <batch:chunk reader="jdbcItemReaderTeacherInterview" writer="teacherInterviewItemWriter" processor="teacherInterviewProcessor" commit-interval="10"> </batch:chunk> </batch:tasklet> </batch:step> </batch:job> <!--job的读取数据操作--> <bean id="jdbcItemReaderTeacherInterview" class="org.springframework.batch.item.database.JdbcCursorItemReader" scope="step"> <property name="dataSource" ref="dataSource" /> <property name="sql" value="select distinct teacherName ,count(teacherName) as num from examininterviewrecord where pdate >'${detail_startime}' and pdate < '${detail_endtime}' GROUP BY teacherName " /> <property name="rowMapper" ref="teacherInterviewMapper"> </property> </bean> </beans> |
读取数据 teacherInterviewMapper
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package com.yc.batch; import java.sql.ResultSet; import java.sql.SQLException; import org.springframework.jdbc.core.RowMapper; import org.springframework.stereotype.Component; import com.yc.vo.TeacherInterviewdetail; import com.yc.vo.TeacherWorkdetail; import com.yc.vo.Workdetail; @Component("teacherInterviewMapper") public class TeacherInterviewMapper implements RowMapper { @Override public Object mapRow(ResultSet rs, int rowNum) throws SQLException { TeacherInterviewdetail TId=new TeacherInterviewdetail(); TId.setTeacherName(rs.getString("teacherName")); TId.setNum(rs.getInt("num")); return TId; } } |
处理数据 teacherInterviewProcessor ，这个处理数据方法，一般都是在这里在这里进行一些数据的加工，比如有些数据没有读到，你也可以在这个方法和后面那个写入数据的类里面写，所以就导致了这个类里面你可以什么都不敢，直接把数据抛到后面去，让后面的写数据类来处理；我这里就是处理数据的这个类什么都没写，但是最好还是按它的规则来！
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package com.yc.batch; import org.hibernate.engine.transaction.jta.platform.internal.SynchronizationRegistryBasedSynchronizationStrategy; import org.springframework.batch.item.ItemProcessor; import org.springframework.stereotype.Component; import org.springframework.stereotype.Service; import com.yc.vo.TeacherInterviewdetail; import com.yc.vo.TeacherWorkdetail; import com.yc.vo.Workdetail; //业务层 @Component("teacherInterviewProcessor") public class TeacherInterviewProcessor implements ItemProcessor<TeacherInterviewdetail, TeacherInterviewdetail> { @Override public TeacherInterviewdetail process(TeacherInterviewdetail teacherInterviewdetail) throws Exception { return teacherInterviewdetail; } } |
写数据 teacherInterviewItemWriter 这个类里面主要是把数据写进一个文件里，同时我这个类里面还有一些数据处理
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package com.yc.batch; import java.io.InputStream; import java.text.NumberFormat; import java.util.ArrayList; import java.util.List; import java.util.Properties; import javax.annotation.Resource; import org.springframework.batch.item.ItemWriter; import org.springframework.stereotype.Component; import org.springframework.stereotype.Service; import com.yc.biz.ExamineeClassBiz; import com.yc.biz.WorkBiz; import com.yc.utils.CsvUtils; import com.yc.vo.TeacherInterviewdetail; import com.yc.vo.TeacherWorkdetail; import com.yc.vo.Workdetail; import net.sf.ehcache.util.PropertyUtil; //写 @Component("teacherInterviewItemWriter") public class TeacherInterviewItemWriter implements ItemWriter<TeacherInterviewdetail>{ @Override public void write(List<? extends TeacherInterviewdetail> teacherInterviewdetails) throws Exception { Properties props = new Properties(); InputStream in= PropertyUtil.class.getClassLoader().getResourceAsStream("connectionConfig.properties"); props.load(in); String time=props.getProperty("detail_time"); CsvUtils cu=new CsvUtils(); List<Object> works=new ArrayList<Object>(); for(TeacherInterviewdetail t:teacherInterviewdetails){ works.add(t); } String path=this.getClass().getResource("/").getPath(); path=path.substring(0,path.lastIndexOf("/")); path=path.substring(0,path.lastIndexOf("/")); path=path.substring(0,path.lastIndexOf("/")); path=path.substring(0,path.lastIndexOf("/")); cu.writeCsv(path+"/csv/teacherInterview_"+time+".csv",works ); } } |
我这里有用到一个吧数据写进CSV文件的jar包
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<dependency> <groupId>net.sourceforge.javacsv</groupId> <artifactId>javacsv</artifactId> <version>2.0</version> </dependency> |
CsvUtils帮助类的写入CSV文件方法
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/** * 写入CSV文件 * @throws IOException */ public void writeCsv(String path,List<Object> t) throws IOException{ String csvFilePath = path; String filepath=path.substring(0,path.lastIndexOf("/")); File f=new File(filepath); if(!f.exists()){ f.mkdirs(); } File file=new File(path); if(!file.exists()){ file.createNewFile(); } CsvWriter wr =new CsvWriter(csvFilePath,',',Charset.forName("GBK")); try { for(Object obj:t){ String[] contents=obj.toString().split(","); wr.writeRecord(contents); } wr.close(); } catch (IOException e) { e.printStackTrace(); } } |
就这样一个基本的batch流程就跑起来了，它通过从数据里读取一些数据，然后经过处理后，被存进服务器下的一个文件里面，之后像这种数据的读取就不需要去数据库里面查询了，而是可以直接通过读取CSV文件来处理这个业务。一般使用这个的都会配一个定时器，让它们每隔一段时间跑一次，从而获得较新的数据
下面是定时器的配置
定时器的配置非常简单，我是使用注解方式来配置的
定时器任务类
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package com.yc.task.impl; import javax.transaction.Transactional; import org.springframework.batch.core.JobParametersInvalidException; import org.springframework.batch.core.repository.JobExecutionAlreadyRunningException; import org.springframework.batch.core.repository.JobInstanceAlreadyCompleteException; import org.springframework.batch.core.repository.JobRestartException; import org.springframework.batch.item.ItemProcessor; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.scheduling.annotation.Scheduled; import org.springframework.stereotype.Component; import org.springframework.stereotype.Service; import com.yc.batch.ClassBatch; import com.yc.batch.MessageItemBatch; import com.yc.batch.TeacherInterviewBatch; import com.yc.batch.TearcherBatch; import com.yc.po.Work; import com.yc.task.WorkTask; import com.yc.vo.Workdetail; @Servicepublic class WorkTaskImpl implements WorkTask{ @Autowired private TeacherInterviewBatch teacherInterviewBatch;//教师访谈记录 public void setTeacherInterviewBatch(TeacherInterviewBatch teacherInterviewBatch) { this.teacherInterviewBatch = teacherInterviewBatch; } @Scheduled(cron= "0 30 22 * * ?") //每天晚上十点30执行一次 这个注解会让框架会自动把这个方法看成任务启动方法 @Override public void task() { try { teacherInterviewBatch.test();//教师访谈 } catch (Exception e) { e.printStackTrace(); } } } |
定时器所真正要执行的方法
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package com.yc.batch; import javax.annotation.Resource; import org.apache.commons.jexl2.Main; import org.springframework.batch.core.Job; import org.springframework.batch.core.JobExecution; import org.springframework.batch.core.JobParameters; import org.springframework.batch.core.JobParametersBuilder; import org.springframework.batch.core.JobParametersInvalidException; import org.springframework.batch.core.launch.JobLauncher; import org.springframework.batch.core.repository.JobExecutionAlreadyRunningException; import org.springframework.batch.core.repository.JobInstanceAlreadyCompleteException; import org.springframework.batch.core.repository.JobRestartException; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Component; @Componentpublic class TeacherInterviewBatch { private Job job; private JobLauncher launcher; @Resource(name="writerteacherInterview") public void setJob(Job job) { this.job = job; } @Autowired public void setLauncher(JobLauncher launcher) { this.launcher = launcher; } |
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：http://blog.csdn.net/pttaoge/article/details/76684656
