一文带你了解FastExcel的使用

<dependency>
  <groupId>cn.idev.excel</groupId>
  <artifactId>fastexcel</artifactId>
  <version>1.0.0</version> <!-- 请确保使用最新版本 -->
</dependency>
<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter</artifactId>
</dependency>

import cn.idev.excel.annotation.ExcelProperty;
import lombok.Getter;
import lombok.Setter;
import lombok.ToString;

@Setter
@Getter
@ToString
public class User {
    @ExcelProperty("编号")
    private Integer id;
    @ExcelProperty("名字")
    private String name;
    @ExcelProperty("年龄")
    private Integer age;
}

import cn.idev.excel.context.AnalysisContext;
import cn.idev.excel.event.AnalysisEventListener;

import java.util.ArrayList;
import java.util.List;
public class BaseExcelListener<T> extends AnalysisEventListener<T> {
    // 用于存储读取到的Excel数据对象列表
    private List<T> dataList = new ArrayList<>();
    @Override
    public void invoke(T t, AnalysisContext analysisContext) {
        // 每读取一行数据，就将其添加到dataList中
        dataList.add(t);
    }
    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {
        // 当所有数据读取完成后，可以在这里进行一些后续操作，如打印读取到的数据数量
        System.out.println("读取完成，共读取了 " + dataList.size() + " 条数据");
    }
    // 提供一个方法用于获取存储数据的列表
    public List<T> getDataList() {
        return dataList;
    }
}

// Excel写入功能
@GetMapping("/download")
public void download(HttpServletResponse response) throws IOException {
    response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
    response.setCharacterEncoding("utf-8");
    String fileName = URLEncoder.encode("test", "UTF-8");
    response.setHeader("Content-disposition",
                       "attachment;filename*=utf-8''" + fileName + ".xlsx");
    // 写入数据
    FastExcel.write(response.getOutputStream(), User.class)
    .sheet("模板")
    .doWrite(buildData());
}
// 创建测试数据
private List<User> buildData() {
    // 创建 User 测试数据
    User user1 = new User();
    user1.setId(1);
    user1.setName("张三");
    user1.setAge(18);
    User user2 = new User();
    user2.setId(2);
    user2.setName("李四");
    user2.setAge(19);
    return List.of(user1, user2);
}

// Excel读取功能
@PostMapping("/upload")
public ResponseEntity<String> upload(@RequestParam("file") MultipartFile file) {
    if (file.isEmpty()) {
        return ResponseEntity.badRequest().body("请选择一个文件上传！");
    }
    try {
        BaseExcelListener<User> baseExcelListener = new BaseExcelListener<>();
        FastExcel.read(file.getInputStream(), User.class,
                       baseExcelListener).sheet().doRead();
        // 得到读取数据
        List<User> dataList = baseExcelListener.getDataList();
        System.out.println(dataList);
        return ResponseEntity.ok("文件上传并处理成功！");
    } catch (IOException e) {
        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body("文件处理失败！");
    }
}

<!-- easyexcel 依赖 -->
<dependency>
  <groupId>com.alibaba</groupId>
  <artifactId>easyexcel</artifactId>
  <version>xxxx</version>
</dependency>

<dependency>
  <groupId>cn.idev.excel</groupId>
  <artifactId>fastexcel</artifactId>
  <version>1.0.0</version>
</dependency>

// 将 easyexcel 的包名替换为 FastExcel 的包名
import com.alibaba.excel.**;

import cn.idev.excel.**;

FastExcel.convertToPdf(new File("excelFile"),new File("pdfFile"),null,null);