这期内容当中小编将会给大家带来有关怎么在SpringBoot中利用EasyExcel导入Excel文件,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。
1、 在pom.xml中添加EasyExcel依赖
<dependency> <groupId>com.alibaba</groupId> <artifactId>easyexcel</artifactId> <version>2.1.3</version> </dependency>
2、创建EasyExcel映射实体类
import com.alibaba.excel.annotation.ExcelProperty; public class ExcelEntity { // ExcelProperty中的参数要对应Excel中的标题 @ExcelProperty("ID") private int ID; @ExcelProperty("NAME") private String name; @ExcelProperty("AGE") private int age; public ExcelEntity() { } public ExcelEntity(int ID, String name, int age) { this.ID = ID; this.name = name; this.age = age; } public int getID() { return ID; } public void setID(int ID) { this.ID = ID; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } }
3、创建自定义Easyexcel的监听类
这个监听类里面每一个ExcelEntity对象代表一行数据
在这个监听类里面可以对读取到的每一行数据进行单独操作
这里的读取的数据是按照Excel中每一条数据的顺序进行读取的
import com.alibaba.excel.context.AnalysisContext; import com.alibaba.excel.event.AnalysisEventListener; import java.util.ArrayList; import java.util.List; public class UploadExcelListener extends AnalysisEventListener<ExcelEntity> { private static final Logger logger = LoggerFactory.getLogger(LoggerItemController.class); public static final List<ExcelEntity> list = new ArrayList<>(); @Override public void invoke(ExcelEntity excelEntity, AnalysisContext context) { logger.info(String.valueOf(excelEntity.getID())); logger.info(excelEntity.getName()); logger.info(String.valueOf(excelEntity.getAge())); list.add(excelEntity); }
4、创建controller
import com.alibaba.excel.EasyExcel; import com.alibaba.excel.ExcelReader; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.web.bind.annotation.*; import org.springframework.web.multipart.MultipartFile; import java.io.IOException; import java.io.InputStream; import java.util.List; @RestController @CrossOrigin @RequestMapping("/loggerItem") public class LoggerItemController { // MultipartFile 这个类一般是用来接受前台传过来的文件 @PostMapping("/upload") public List<ExcelEntity> upload(@RequestParam(value = "multipartFile") MultipartFile multipartFile){ if (multipartFile == null){ return null; } InputStream in = null; try { // 从multipartFile获取InputStream流 in = multipartFile.getInputStream(); /* * EasyExcel 有多个不同的read方法,适用于多种需求 * 这里调用EasyExcel中通过InputStream流方式读取Excel的Read方法 * 他会返回一个ExcelReaderBuilder类型的返回值 * ExcelReaderBuilder中有一个doReadAll方法,会读取所有的Sheet */ EasyExcel.read(in,ExcelEntity.class,new UploadExcelListener()) .sheet("Sheet1") .doRead(); // 每次EasyExcel的read方法读取完之后都会关闭流,我这里为了试验doReadAll方法,所以重新获取了一次 in = multipartFile.getInputStream(); /* * ExcelReaderBuilder中的Sheet方法,需要添加读取的Sheet名作为参数 * 并且不要忘记在后面再调用一下doReadAll方法,否则不会进行读取操作 */ EasyExcel.read(in,ExcelEntity.class,new UploadExcelListener()).doReadAll(); } catch (IOException e) { e.printStackTrace(); } return UploadExcelListener.list; } }
5、application.yml配置
server: # 指定端口号 port: 8080 spring: servlet: multipart: # 配置单个上传文件大小 file-size-threshold: 100M # 配置总上传大小 max-request-size: 300M
6、测试
我们先搞一个简单的Excel,用来测试
然后通过Postman模拟发送请求
选择Post请求并输入请求地址
在下面选择Body
Key的框中输入controller中的请求的方法中的参数,后面的下拉框中选择File
VALUE框中有一个Select File ,点击后选择自己刚才创建的测试的Excel
最后点击Send发送请求
返回值如下:
由于我读了两次都放在同一个List中返回,所以返回值中有8个对象。
[ { "name": "小黑", "age": 25, "id": 1 }, { "name": "小白", "age": 22, "id": 2 }, { "name": "小黄", "age": 22, "id": 3 }, { "name": "小绿", "age": 23, "id": 4 }, { "name": "小黑", "age": 25, "id": 1 }, { "name": "小白", "age": 22, "id": 2 }, { "name": "小黄", "age": 22, "id": 3 }, { "name": "小绿", "age": 23, "id": 4 } ]
/** * Build excel the read * * @return Excel reader builder. */ public static ExcelReaderBuilder read() { return new ExcelReaderBuilder(); } /** * Build excel the read * * @param file * File to read. * @return Excel reader builder. */ public static ExcelReaderBuilder read(File file) { return read(file, null, null); } /** * Build excel the read * * @param file * File to read. * @param readListener * Read listener. * @return Excel reader builder. */ public static ExcelReaderBuilder read(File file, ReadListener readListener) { return read(file, null, readListener); } /** * Build excel the read * * @param file * File to read. * @param head * Annotate the class for configuration information. * @param readListener * Read listener. * @return Excel reader builder. */ public static ExcelReaderBuilder read(File file, Class head, ReadListener readListener) { ExcelReaderBuilder excelReaderBuilder = new ExcelReaderBuilder(); excelReaderBuilder.file(file); if (head != null) { excelReaderBuilder.head(head); } if (readListener != null) { excelReaderBuilder.registerReadListener(readListener); } return excelReaderBuilder; } /** * Build excel the read * * @param pathName * File path to read. * @return Excel reader builder. */ public static ExcelReaderBuilder read(String pathName) { return read(pathName, null, null); } /** * Build excel the read * * @param pathName * File path to read. * @param readListener * Read listener. * @return Excel reader builder. */ public static ExcelReaderBuilder read(String pathName, ReadListener readListener) { return read(pathName, null, readListener); } /** * Build excel the read * * @param pathName * File path to read. * @param head * Annotate the class for configuration information. * @param readListener * Read listener. * @return Excel reader builder. */ public static ExcelReaderBuilder read(String pathName, Class head, ReadListener readListener) { ExcelReaderBuilder excelReaderBuilder = new ExcelReaderBuilder(); excelReaderBuilder.file(pathName); if (head != null) { excelReaderBuilder.head(head); } if (readListener != null) { excelReaderBuilder.registerReadListener(readListener); } return excelReaderBuilder; } /** * Build excel the read * * @param inputStream * Input stream to read. * @return Excel reader builder. */ public static ExcelReaderBuilder read(InputStream inputStream) { return read(inputStream, null, null); } /** * Build excel the read * * @param inputStream * Input stream to read. * @param readListener * Read listener. * @return Excel reader builder. */ public static ExcelReaderBuilder read(InputStream inputStream, ReadListener readListener) { return read(inputStream, null, readListener); } /** * Build excel the read * * @param inputStream * Input stream to read. * @param head * Annotate the class for configuration information. * @param readListener * Read listener. * @return Excel reader builder. */ public static ExcelReaderBuilder read(InputStream inputStream, Class head, ReadListener readListener) { ExcelReaderBuilder excelReaderBuilder = new ExcelReaderBuilder(); excelReaderBuilder.file(inputStream); if (head != null) { excelReaderBuilder.head(head); } if (readListener != null) { excelReaderBuilder.registerReadListener(readListener); } return excelReaderBuilder; }
所有的方法都在这儿了,其实如果看不懂到底应该调用哪一个read方法的话,可以以根据自己所能得到的参数来判断。
读取本地Excel
public static void main(String[] args) { EasyExcel.read("C:/Users/Lonely Programmer/Desktop/新建 Microsoft Excel 工作表.xlsx" ,ExcelEntity.class ,new UploadExcelListener()) .doReadAll(); }
读取本地的Excel和通过InPutStream流读取的方式是一样的,只是参数变了,原本传的是InPutStream流,现在传的是文件的绝对路径。我这里监听类和映射实体类都没有变,和上传用的是同一个,大家也可以根据需求来设定自己的监听类与实体类
MultipartFile文档
MultipartFile文档地址:https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/web/multipart/MultipartFile.html
翻译是通过Google Chrome自带翻译插件进行翻译的,建议大家使用Google Chrome打开,自带翻译功能
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