spring batch的使用和定时器Quart的使用

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

<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

<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>
<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>
<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

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<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

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

<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

/**
* 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

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);
}
}

就这样batch就被定时器调度起来了，每天十点准时使用batch来操作数据

转自：https://blog.csdn.net/pttaoge/article/details/76684656

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spring batch的使用和定时器Quart的使用

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