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
org.springframework
spring-batch-core
2.1.8.RELEASE
org.springframework
spring-batch-infrastructure
2.1.8.RELEASE
org.springframework
spring-batch-test
2.1.8.RELEASE
batch.xml
读取数据 teacherInterviewMapper
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!
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 {
@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
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{
@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
net.sourceforge.javacsv
javacsv
2.0
/**
* 写入CSV文件
* @throws IOException
*/
public void writeCsv(String path,List 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();
}
}
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
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;
@Service
public 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
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;
@Component
public 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;
}
public void test() throws JobExecutionAlreadyRunningException, JobRestartException, JobInstanceAlreadyCompleteException, JobParametersInvalidException{
JobParameters jobParameters =
new JobParametersBuilder()
.addLong("time",System.currentTimeMillis()).toJobParameters();
JobExecution result = launcher.run(job, jobParameters);
}
}