Spring Boot 批處理

Spring Batch是一個開源 的、全面的、輕量級的批處理框架，通過Spring  Boot 可以實現強大的批處理應用程序開發。

Spring Batch提供了ItemReader、ItemProcessor和ItemWriter來完成數據的讀取、處理及寫出操作，並且可以將批處理的執行狀態 持久化到數據庫中。

https://spring.io/projects/spring-batch

1.添加依賴

<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-batch</artifactId>
</dependency>
<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
	<groupId>com.alibaba</groupId>
	<artifactId>druid-spring-boot-starter</artifactId>
	<version>1.1.9</version>
</dependency>
<dependency>
	<groupId>mysql</groupId>
	<artifactId>mysql-connector-java</artifactId>
</dependency>

2.添加配置 信息

server.port=9000
spring.http.encoding.force-response=true
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.url=jdbc:mysql:///batch
spring.datasource.username  = root
spring.datasource.password  = kangxg198811
#項目啓動時創建數據表的SQL腳本
spring.datasource.schema=classpath:/org/springframework/batch/core/schema-mysql.sql
#項目啓動時執行建表SQL
spring.batch.initialize-schema=always
#配置後不會自動執行
spring.batch.job.enabled=false

 3.在項目啓動類上添加@EnableBatchProcessing註解開開啓Spring Batch支持

@SpringBootApplication
@EnableBatchProcessing
public class BatchApplication {

	public static void main(String[] args) {
		SpringApplication.run(BatchApplication.class, args);
	}

}

4.配置批處理

@Configuration
public class CsvBatchJobConfig {
    @Autowired
    JobBuilderFactory jobBuilderFactory;

    @Autowired
    StepBuilderFactory stepBuilderFactory;

    @Autowired
    DataSource dataSource;

    class CustomLineCallbackHandler implements LineCallbackHandler{
        @Override
        public void handleLine(String result)
        {
            System.out.println(result);
        }
    }
    @Bean
    ItemReader<User> itemReader()
    {
         FlatFileItemReader<User> reader = new FlatFileItemReader<User>();
         reader.setLinesToSkip(1);
         reader.setResource(new ClassPathResource("data.csv"));
         reader.setLineMapper(new DefaultLineMapper<User>(){
             {
                 setLineTokenizer(new DelimitedLineTokenizer(){{
                     setNames(new String[]{"id","username","address","gender"});
                     //setDelimiter("\t");
                 }});
                 setFieldSetMapper(new BeanWrapperFieldSetMapper<User>(){{
                     setTargetType(User.class);
                 }});

             }
         });
         reader.setSkippedLinesCallback(new CustomLineCallbackHandler());
         return reader;
    }

    @Bean
    JdbcBatchItemWriter jdbcBatchItemWriter()
    {
        JdbcBatchItemWriter writer = new JdbcBatchItemWriter();
        writer.setDataSource(dataSource);
        writer.setSql("insert into user(id,username,address,gender)" + "values(:id,:username,:address,:gender)");
        writer.setItemSqlParameterSourceProvider(new BeanPropertyItemSqlParameterSourceProvider());
        return  writer;
    }

    @Bean
    Step csvStep()
    {
        return  stepBuilderFactory.get("csvStep")
                .<User,User>chunk(2)
                .reader(itemReader())
                .writer(jdbcBatchItemWriter())
                .build();
    }

    @Bean
    Job csvJob()
    {
        return jobBuilderFactory.get("csvJob")
                .start(csvStep())
                .build();
    }

}

5.實體類

public class User {
    private Integer id;

    private String username;

    private  String address;

    private  String gender;
    public User(Integer id,String username,String address,String gender)
    {
        this.username= username;
        this.id = id;
        this.address = address;
        this.gender = gender;
    }

    public  User()
    {
        super();
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public void setGender(String gender) {
        this.gender = gender;
    }
    public void setAddress(String address) {
        this.address = address;
    }

    public String getUsername() {
        return username;
    }

    public String getGender() {
        return gender;
    }
    
    public Integer getId() {
        return id;
    }
    
    public String getAddress() {
        return address;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", address='" + address + '\'' +
                ", gender='" + gender + '\'' +
                '}';
    }
}

6.創建Controller

@RestController
public class BatchController {
    @Autowired
    JobLauncher jobLauncher;

    @Autowired
    Job job;

    @GetMapping("/batch")
    public void batch()
    {
        try {
            jobLauncher.run(job,new JobParametersBuilder().toJobParameters());

        }catch (Exception e)
        {
            e.printStackTrace();
        }
    }

}

 

這裏配置就結束了，數據庫會增加一些自動創建到表，但是User表不能自動創建和字段需要提前設置，否則會出現錯誤，還需要進一步處理，待完成。暫做標記！