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目录

案例需求

分析

项目准备

步骤1：新开spring-batch-example

步骤2：导入依赖

步骤3：配置文件

步骤4：建立employee表与employe_temp表

步骤5：建立基本代码体系-domain-mapper-service-controller-mapper.xml

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到这，整个Spring Batch 教程知识点就全部讲完了，接下来就使用一个综合案例将讲过核心知识串联起来，再来回顾一遍。

案例需求

1>先动态生成50w条员工数据，存放在employee.csv文件中

2>启动作业异步读取employee.csv文件，将读到数据写入到employee_temp表，要求记录读与写消耗时间

3>使用分区的方式将employee_temp表的数据读取并写入到employee表

分析

上面需求存在一定连贯性，为了操作简单，使用springMVC项目， 每一个需求对应一个接口：

1：发起 /dataInit 初始化50w数据进入employee.csv文件

使用技术点：SpringMVC IO

2：发起/csvToDB 启动作业，将employee.csv 数据写入employee_temp表, 记录读与写消耗时间

使用技术点：SpringMVC ItemReader JobExecutionListener

ItemWriter (如果使用Mybatis框架MyBatisBatchItemWriter/MyBatisPagingItemReaderReader)

3：发起/dbToDB 启动作业，将employee_temp数据写入employee表

使用技术点：SpringMVC ItemReader partitioner

ItemWriter(如果使用Mybatis框架：MyBatisBatchItemWriter/MyBatisPagingItemReaderReader)

项目准备

步骤1：新开spring-batch-example

步骤2：导入依赖

<parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.7.3</version><relativePath/>
</parent>
<properties><maven.compiler.source>11</maven.compiler.source><maven.compiler.target>11</maven.compiler.target>
</properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-batch</artifactId></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.12</version></dependency><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>1.3.2</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>druid-spring-boot-starter</artifactId><version>1.1.14</version></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-validation</artifactId></dependency>
</dependencies>

步骤3：配置文件

spring:datasource:username: rootpassword: adminurl: jdbc:mysql://127.0.0.1:3306/springbatch?serverTimezone=GMT%2B8&useSSL=false&allowPublicKeyRetrieval=truedriver-class-name: com.mysql.cj.jdbc.Driver# 初始化数据库，文件在依赖jar包中sql:init:schema-locations: classpath:org/springframework/batch/core/schema-mysql.sql#mode: alwaysmode: neverbatch:job:enabled: falsedruid:# 连接池配置#初始化连接池的连接数量 大小，最小，最大initial-size: 10min-idle: 10max-active: 20#配置获取连接等待超时的时间max-wait: 60000#配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒time-between-eviction-runs-millis: 60000# 配置一个连接在池中最小生存的时间，单位是毫秒min-evictable-idle-time-millis: 30000validation-query: SELECT 1 FROM DUALtest-while-idle: truetest-on-borrow: truetest-on-return: false# 是否缓存preparedStatement，也就是PSCache  官方建议MySQL下建议关闭   个人建议如果想用SQL防火墙 建议打开pool-prepared-statements: falsemax-pool-prepared-statement-per-connection-size: 20mybatis:configuration:default-executor-type: batchjob:data:path: D:/spring-batch-example/

步骤4：建立employee表与employe_temp表

CREATE TABLE `employee` (`id` int NOT NULL AUTO_INCREMENT,`name` varchar(255) DEFAULT NULL,`age` int DEFAULT NULL,`sex` int DEFAULT NULL,PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;

CREATE TABLE `employee_temp` (`id` int NOT NULL AUTO_INCREMENT,`name` varchar(255) DEFAULT NULL,`age` int DEFAULT NULL,`sex` int DEFAULT NULL,PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;

步骤5：建立基本代码体系-domain-mapper-service-controller-mapper.xml

domain  

@Setter
@Getter
@ToString
public class Employee {private Long id;private String name;private int age;private int sex;
}

mapper.java

public interface EmployeeMapper {/*** 添加*/int save(Employee employee);
}

service接口

public interface IEmployeeService {/*** 保存*/void save(Employee employee);
}

service接口实现类

@Service
public class EmployeeServiceImpl implements IEmployeeService {@Autowiredprivate EmployeeMapper employeeMapper;@Overridepublic void save(Employee employee) {employeeMapper.save(employee);}
}

启动类

@SpringBootApplication
@EnableBatchProcessing
@MapperScan("com.langfeiyes.exp.mapper")
public class App {public static void main(String[] args) {SpringApplication.run(App.class, args);}
}

Mapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.langfeiyes.exp.mapper.EmployeeMapper"><resultMap id="BaseResultMap" type="com.langfeiyes.exp.domain.Employee"><result column="id" jdbcType="INTEGER" property="id" /><result column="name" jdbcType="VARCHAR" property="name" /><result column="age" jdbcType="VARCHAR" property="age" /><result column="sex" jdbcType="VARCHAR" property="sex" /></resultMap><insert id="save" keyColumn="id" useGeneratedKeys="true" keyProperty="id">insert into employee(id, name, age, sex) values(#{id},#{name},#{age},#{sex})</insert>
</mapper>

到这，本篇就结束了，欲知后事如何，请听下回分解~

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