阿里巴巴-EasyExcel使用

Posted 2020-12-20 nayou

EasyExcel

概述

EasyExcel是一个基于Java的简单、省内存的读写Excel的开源项目。在尽可能节约内存的情况下支持读写百M的Excel。

github地址：https://github.com/alibaba/easyexcel

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EasyExcel控制表格注解

@ContentRowHeight(int):

设置 row 高度，不包含表头
标记在 类上
@ContentRowHeight(15) //设置行高

@HeadRowHeight(int)：

设置 表头 高度（与 @ContentRowHeight 相反）
标记在 类上
@HeadRowHeight(20)  //设置表头高度

@ColumnWidth(int)：

设置列宽
标记在属性上
@ColumnWidth(20)  //设置列宽

@ExcelProperty(value = String[], index = int):

设置表头信息
value: 表名称
index: 列号

@ExcelProperty(index = 0, value = "学生名字")

SpringBoot实战应用

导入依赖

<!-- https://mvnrepository.com/artifact/com.alibaba/easyexcel -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>easyexcel</artifactId>
    <version>2.0.0-beta5</version>
</dependency>

创建Excel实体类对象

@Data
@ContentRowHeight(15)
@HeadRowHeight(20)
@ColumnWidth(20)
public class StudentCurrentExcel {
    @ExcelProperty(index = 0, value = "学生名字")
    private String studentName;

    @ExcelProperty(index = 1, value = "性别")
    private String gender;

    @ExcelProperty(index = 2, value = "年级/班级")
    private String deptCode;

    @ExcelProperty(index = 3, value = "通道名称")
    private String screenName;

    @ExcelProperty(index = 4, value = "通行方向")
    private String direction;

    @ExcelProperty(index = 5, value = "通行时间")
    private Date passageTime;

    @ExcelProperty(index = 6, value = "体温")
    private String temperate;

    @ExcelProperty(index = 7, value = "组织结构")
    private Integer deptId;
}

导出Controller

@UnAuthorized
@ApiOperation(value = "导出学生通行记录")
@GetMapping("studentCurrents/export")
public void exportStudentCurrents(HttpServletResponse response, HttpServletRequest request) throws IOException {
    //设置响应类型
    response.setContentType("application/vnd.ms-excel");
    //设置字符编码
    response.setCharacterEncoding("utf-8");
    //设置文件名字
    String fileName = "学生通行记录" + DateUtils.getDate("yyyy-MM-dd HH:mm") + ".xlsx";
    //设置响应头信息
    response.setHeader("Content-Disposition", "attachment; filename=" + java.net.URLEncoder.encode(fileName, "UTF-8"));

    List<StudentCurrent> all = this.studentCurrentService.findAll();

    List<StudentCurrentExcel> list = getNotPassData2(all);
    //写入文件数据
    EasyExcel.write(response.getOutputStream(), StudentCurrentExcel.class).sheet("员工考勤信息").doWrite(list);
}

格式转换

/**
* 将实体类对象 转为Excel对象
* @param studentCurrentList
* @return
*/
private List<StudentCurrentExcel> getNotPassData2(List<StudentCurrent> studentCurrentList) {
    List<StudentCurrentExcel> list = new ArrayList<>();
    for (StudentCurrent studentCurrent : studentCurrentList) {
        StudentCurrentExcel excel = new StudentCurrentExcel();
        Integer gender = studentCurrent.getGender();

        excel.setStudentName(studentCurrent.getStudentName());
        excel.setGender(studentCurrent.getGender() == 4 ? "男" : "女");

        excel.setDeptCode(studentCurrent.getDeptCode());
        excel.setDeptId(studentCurrent.getDeptId());
        excel.setPassageTime(studentCurrent.getPassageTime());
        excel.setTemperate(studentCurrent.getTemperate());
        excel.setScreenName(studentCurrent.getScreenName());
        list.add(excel);
    }
    return list;
}