一、pom文件
<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>
二、配置文件
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
三、mapper文件
@Mapper
public interface DdbBookNewWordMapper extends BaseMapper<DdbBookNewWord> {
}
四、service文件
@Service
public class DemoDAO {
@Autowired
DdbBookNewWordMapper mapper;
public void save(List<DataDemo001> list) {
// 如果是mybatis,盡量別直接調(diào)用多次insert,自己寫一個mapper里面新增一個方法batchInsert,所有數(shù)據(jù)一次性插入
DdbBookNewWord newWord = new DdbBookNewWord();
System.out.println("插入數(shù)據(jù)開始===============================");
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("結(jié)束=========================");
}
}
五、實體類（數(shù)據(jù)庫對應(yīng)）
@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;
}
六、excel對應(yīng)的實體類
@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;
}
七、監(jiān)聽器
// 有個很重要的點 DemoDataListener 不能被spring管理，要每次讀取excel都要new,然后里面用到spring可以構(gòu)造方法傳進(jìn)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條存儲數(shù)據(jù)庫，實際使用中可以3000條，然后清理list ，方便內(nèi)存回收
*/
private static final int BATCH_COUNT = 100;
List<DataDemo001> list = new ArrayList<DataDemo001>();
/**
* 假設(shè)這個是一個DAO，當(dāng)然有業(yè)務(wù)邏輯這個也可以是一個service。當(dāng)然如果不用存儲這個對象沒用。
*/
private DemoDAO demoDAO;
//
public DataDemo001Listener(DemoDAO demoDAO) {
// 這里是demo，所以隨便new一個。實際使用如果到了spring,請使用下面的有參構(gòu)造函數(shù)
this.demoDAO = demoDAO;
}
/**
* 如果使用了spring,請使用這個構(gòu)造方法。每次創(chuàng)建Listener的時候需要把spring管理的類傳進(jìn)來
*
* @param demoDAO
*/
// public DataDemo001Listener(DemoDAO demoDAO) {
// this.demoDAO = demoDAO;
// }
/**
* 這個每一條數(shù)據(jù)解析都會來調(diào)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);
// 達(dá)到BATCH_COUNT了，需要去存儲一次數(shù)據(jù)庫，防止數(shù)據(jù)幾萬條數(shù)據(jù)在內(nèi)存，容易OOM
if (list.size() >= BATCH_COUNT) {
saveData();
// 存儲完成清理 list
list.clear();
}
}
/**
* 所有數(shù)據(jù)解析完成了 都會來調(diào)用
*
* @param context
*/
@Override
public void doAfterAllAnalysed(AnalysisContext context) {
// 這里也要保存數(shù)據(jù)，確保最后遺留的數(shù)據(jù)也存儲到數(shù)據(jù)庫
saveData();
LOGGER.info("所有數(shù)據(jù)解析完成！");
}
/**
* 加上存儲數(shù)據(jù)庫
*/
private void saveData() {
demoDAO.save(list);
}
}
八、測試類
String path = "D:\java-demo\kuang-poi\";
@Test
public void simpleRead() {
String fileName = path+"悠游閱讀成長計劃-單詞部分.xls";
// 這里 需要指定讀用哪個class去讀，然后讀取第一個sheet 文件流會自動關(guān)閉
EasyExcel.read(fileName, DataDemo001.class, new DataDemo001Listener(demoDAO)).sheet().doRead();
}
九、啟動類(沒啥用）
@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);
}
}
十、結(jié)構(gòu)
那么，關(guān)于如何使用Java把Excel文件中的數(shù)據(jù)導(dǎo)入數(shù)據(jù)庫的詳細(xì)步驟和完整代碼的全部內(nèi)容就介紹完了，想要了解更多關(guān)于Java中的數(shù)據(jù)操作的內(nèi)容，您可以閱讀W3Cschool以前發(fā)布過的一些相關(guān)內(nèi)容的文章，也可以多多關(guān)注接下來的內(nèi)容。
