这期内容当中小编将会给大家带来有关使用java怎么将excel数据导入MySQL，文章内容丰富且以专业的角度为大家分析和叙述，阅读完这篇文章希望大家可以有所收获。
<dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>easyexcel</artifactId> <version>2.1.7</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.62</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>com.mchange</groupId> <artifactId>c3p0</artifactId> <version>0.9.5.2</version> </dependency> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.4.0</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies>
server.port=8080 mybatis-plus.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl spring.datasource.url=jdbc:mysql://localhost:3306/ddb_resources?serverTimezone=UTC spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver spring.datasource.username=root spring.datasource.password=root
@Mapper
public interface DdbBookNewWordMapper extends BaseMapper<DdbBookNewWord> {
}@Service
public class DemoDAO {
@Autowired
DdbBookNewWordMapper mapper;
public void save(List<DataDemo001> list) {
// 如果是mybatis,尽量别直接调用多次insert,自己写一个mapper里面新增一个方法batchInsert,所有数据一次性插入
DdbBookNewWord newWord = new DdbBookNewWord();
System.out.println("插入数据开始===============================");
for (DataDemo001 info : list) {
newWord.setAppType(0);
newWord.setFkBookId(info.getFkBookId());
newWord.setWord(info.getWord());
newWord.setSimpleExplain(info.getSimpleExplain());
newWord.setImgUrl("/incoming/ddb/wordImg/"+info.getFkBookId()+"/"+info.getImgUrl());
newWord.setSoundUrl("/incoming/ddb/wordAudio/bookStudyMp3/"+info.getFkBookId()+"/"+info.getSoundUrl());
newWord.setCreateTimeInMs(1620983400709L);
newWord.setUpdateTimeInMs(1620983400709L);
System.out.println(newWord);
mapper.insert(newWord);
}
System.out.println("结束=========================");
}
}@Data
@AllArgsConstructor
@NoArgsConstructor
@ToString
public class DdbBookNewWord {
private int id;
private String fkBookId;
private String word;
private String simpleExplain;
private String imgUrl;
private long createTimeInMs;
private long updateTimeInMs;
private int appType;
private String soundUrl;
}@Data
public class DataDemo001 {
private String fkBookId;
private String bookeName;
private String moudle;
private String unit;
private String word;
private String soundUrl;
private String imgUrl;
private String simpleExplain;
}// 有个很重要的点 DemoDataListener 不能被spring管理，要每次读取excel都要new,然后里面用到spring可以构造方法传进去
public class DataDemo001Listener extends AnalysisEventListener<DataDemo001> {
// DemoDAO demoDAO = SpringContextHolder.getBean(DemoDAO.class);
private static final Logger LOGGER = LoggerFactory.getLogger(DataDemo001Listener.class);
/**
* 每隔5条存储数据库，实际使用中可以3000条，然后清理list ，方便内存回收
*/
private static final int BATCH_COUNT = 100;
List<DataDemo001> list = new ArrayList<DataDemo001>();
/**
* 假设这个是一个DAO，当然有业务逻辑这个也可以是一个service。当然如果不用存储这个对象没用。
*/
private DemoDAO demoDAO;
//
public DataDemo001Listener(DemoDAO demoDAO) {
// 这里是demo，所以随便new一个。实际使用如果到了spring,请使用下面的有参构造函数
this.demoDAO = demoDAO;
}
/**
* 如果使用了spring,请使用这个构造方法。每次创建Listener的时候需要把spring管理的类传进来
*
* @param demoDAO
*/
// public DataDemo001Listener(DemoDAO demoDAO) {
// this.demoDAO = demoDAO;
// }
/**
* 这个每一条数据解析都会来调用
*
* @param data one row value. Is is same as {@link AnalysisContext#readRowHolder()}
* @param context
*/
@Override
public void invoke(DataDemo001 data, AnalysisContext context) {
System.out.println(JSON.toJSONString(data));
list.add(data);
// 达到BATCH_COUNT了，需要去存储一次数据库，防止数据几万条数据在内存，容易OOM
if (list.size() >= BATCH_COUNT) {
saveData();
// 存储完成清理 list
list.clear();
}
}
/**
* 所有数据解析完成了 都会来调用
*
* @param context
*/
@Override
public void doAfterAllAnalysed(AnalysisContext context) {
// 这里也要保存数据，确保最后遗留的数据也存储到数据库
saveData();
LOGGER.info("所有数据解析完成！");
}
/**
* 加上存储数据库
*/
private void saveData() {
demoDAO.save(list);
}
} String path = "D:\\java-demo\\kuang-poi\\";
@Test
public void simpleRead() {
String fileName = path+"悠游阅读成长计划-单词部分.xls";
// 这里 需要指定读用哪个class去读，然后读取第一个sheet 文件流会自动关闭
EasyExcel.read(fileName, DataDemo001.class, new DataDemo001Listener(demoDAO)).sheet().doRead();
}@MapperScan("com.example.demo.mapper")
@ComponentScan({"com.example.demo.test","com.example.demo.service"})
@SpringBootApplication
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
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