导入依赖

<dependency>
     <groupId>com.alibaba</groupId>
     <artifactId>easyexcel</artifactId>
     <version>4.0.1</version>
</dependency>

1、alibaba.excel.EasyExcel导出工具类 

import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.write.style.column.LongestMatchColumnWidthStyleStrategy;

import javax.servlet.http.HttpServletResponse;
import java.net.URLEncoder;
import java.util.List;

public class ExcelUtil {

    /**
     * 导出excel
     *
     * @param response 响应
     * @param list 数据集
     * @param clazz 类名
     * @param fileName 文件名
     * @return
     */
    public static<T> void exportExcel(HttpServletResponse response, List<T> list, Class<T> clazz, String fileName) {
        try {
            response.setCharacterEncoding("utf-8");
            response.setContentType("application/vnd.ms-excel;charset=UTF-8");
            response.setHeader("Content-disposition", "attachment;filename=" + URLEncoder.encode(fileName, "utf-8") + ".xlsx");
            EasyExcel.write(response.getOutputStream(), clazz)
                    .registerWriteHandler(new LongestMatchColumnWidthStyleStrategy())//自适应表格格式
                    .sheet("sheet1")
                    .doWrite(list);
        }catch (Exception e){
            throw new RuntimeException(e.getMessage());
        }
    }
}

 2、controller层

   @GetMapping("/export")
    public void exportExcel(HttpServletResponse response,OpreationLogEntity opreationLogEntity){
        List<OpreationLogEntity> oprLogList = opreationLogService.findOprLogList(opreationLogEntity);
        ExcelUtil.exportExcel(response,oprLogList,OpreationLogEntity.class,"系统日志");
    }

3、实体类字段加上注解：

（1）@ExcelIgnore：表示忽略导出该字段数据

（2）@ExcelProperty("账号")：导出对应的字段数据，并且设置Excel属性表头名，

        举例--对应的表头名为：账号

（3）不加注解：例如sysModule字段，会导出该数据，但是表头名为sysModule

@Data
public class OpreationLogEntity{

    @ExcelIgnore
    private Long id;

    @ExcelProperty("账号")
    private String opreCode;

    private String sysModule;
}

3、测试：浏览器地址栏输入url即可导出成功