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這期內容當中小編將會給大家帶來有關使用java怎么將excel數據導入MySQL,文章內容豐富且以專業的角度為大家分析和敘述,閱讀完這篇文章希望大家可以有所收獲。
<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,盡量別直接調用多次insert,自己寫一個mapper里面新增一個方法batchInsert,所有數據一次性插入 DdbBookNewWord newWord = new DdbBookNewWord(); System.out.println("插入數據開始==============================="); 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可以構造方法傳進去 public class DataDemo001Listener extends AnalysisEventListener<DataDemo001> { // DemoDAO demoDAO = SpringContextHolder.getBean(DemoDAO.class); private static final Logger LOGGER = LoggerFactory.getLogger(DataDemo001Listener.class); /** * 每隔5條存儲數據庫,實際使用中可以3000條,然后清理list ,方便內存回收 */ private static final int BATCH_COUNT = 100; List<DataDemo001> list = new ArrayList<DataDemo001>(); /** * 假設這個是一個DAO,當然有業務邏輯這個也可以是一個service。當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造函數 this.demoDAO = demoDAO; } /** * 如果使用了spring,請使用這個構造方法。每次創建Listener的時候需要把spring管理的類傳進來 * * @param demoDAO */ // public DataDemo001Listener(DemoDAO demoDAO) { // this.demoDAO = demoDAO; // } /** * 這個每一條數據解析都會來調用 * * @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); // 達到BATCH_COUNT了,需要去存儲一次數據庫,防止數據幾萬條數據在內存,容易OOM if (list.size() >= BATCH_COUNT) { saveData(); // 存儲完成清理 list list.clear(); } } /** * 所有數據解析完成了 都會來調用 * * @param context */ @Override public void doAfterAllAnalysed(AnalysisContext context) { // 這里也要保存數據,確保最后遺留的數據也存儲到數據庫 saveData(); LOGGER.info("所有數據解析完成!"); } /** * 加上存儲數據庫 */ private void saveData() { demoDAO.save(list); } }
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 文件流會自動關閉 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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