Java操做Excel

时间 2019-11-24

标签 java excel 栏目 Java 繁體版

原文原文链接

本文主要使用poi与easypoi工具来操做excel。java

easypoi

官方文档：easypoi.mydoc.io/#text_20297…git

添加依赖

<!-- easypoi  核心依赖包 -->
<dependency>
  <groupId>cn.afterturn</groupId>
  <artifactId>easypoi-base</artifactId>
  <version>3.1.0</version>
</dependency>
<dependency>
    <groupId>cn.afterturn</groupId>
    <artifactId>easypoi-web</artifactId>
    <version>3.1.0</version>
</dependency>
<dependency>
    <groupId>cn.afterturn</groupId>
    <artifactId>easypoi-annotation</artifactId>
    <version>3.1.0</version>
</dependency>
<!-- lombok 的依赖 能够省去对象的getter、setter方法-->
<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.16.20</version>
    <scope>provided</scope>
</dependency>
复制代码

导出

实体类

StudentModel类包括学生姓名，学生性别，出生日期以及进校日期：github

package com.lamarsan.excel_demo.model;

import cn.afterturn.easypoi.excel.annotation.Excel;
import cn.afterturn.easypoi.excel.annotation.ExcelTarget;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import javax.validation.constraints.NotBlank;
import java.io.Serializable;
import java.util.Date;

/** * className: StudentModel * description: TODO * * @author hasee * @version 1.0 * @date 2019/7/11 17:43 */
@Data
@AllArgsConstructor
@NoArgsConstructor
@ExcelTarget("studentEntity")
public class StudentModel implements Serializable {
    /** * id */
    private String id;
    /** * 学生姓名 */
    @Excel(name = "学生姓名", height = 20, width = 30, isImportField = "true_st")
    private String name;
    /** * 学生性别 */
    @Excel(name = "学生性别", replace = {"男_1", "女_2"}, suffix = "生", isImportField = "true_st")
    private int sex;

    @Excel(name = "出生日期", databaseFormat = "yyyyMMddHHmmss", format = "yyyy-MM-dd", isImportField = "true_st", width = 20)
    private Date birthday;

    @Excel(name = "进校日期", databaseFormat = "yyyyMMddHHmmss", format = "yyyy-MM-dd")
    private Date registrationDate;

}
复制代码

导出

使用构造函数构造相应的几个数据后，编写导出语句。web

Workbook workbook = ExcelExportUtil.exportExcel(new ExportParams("2412312",  "测试"),CourseModel.class, courseModels);
复制代码

调用接口

下载后的excel表格以下。数组

导入

编写导入语句。浏览器

@PostMapping(value = "/excelImport")
public Object importExcel(@RequestParam("file") MultipartFile file) {

    //接收导入数组
    List<StudentModel> studentModels = null;
    try {
        studentModels = ExcelImportUtil.importExcel(file.getInputStream(), StudentModel.class, new ImportParams());
    } catch (Exception e) {
        e.printStackTrace();
    }

    return studentModels;
}
复制代码

调用接口

使用postman调用接口localhost:8080/excelReader/excelImport，并去掉表格中的表格头，在body的formdata中选择file，上传刚刚导出的文件，key填写file，获得返回结果以下。 app

合并单元格导出

实体类定义：

课程实体类CourseModel：ide

package com.lamarsan.excel_demo.model;

import cn.afterturn.easypoi.excel.annotation.Excel;
import cn.afterturn.easypoi.excel.annotation.ExcelCollection;
import cn.afterturn.easypoi.excel.annotation.ExcelEntity;
import cn.afterturn.easypoi.excel.annotation.ExcelTarget;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.io.Serializable;
import java.util.List;

/** * className: CourseModel * description: TODO * * @author hasee * @version 1.0 * @date 2019/7/11 17:53 */
@Data
@ExcelTarget("courseEntity")
@NoArgsConstructor
@AllArgsConstructor
public class CourseModel implements Serializable {
    /** * 主键 */
    private String id;
    /** * 课程名称 */
    @Excel(name = "课程名称", orderNum = "1", width = 25)
    private String name;
    /** * 老师主键 */
    @ExcelEntity(id = "absent")
    private TeacherModel mathTeacher;

    @ExcelCollection(name = "学生", orderNum = "4")
    private List<StudentModel> students;

}
复制代码

教师实体类TeacherModel：函数

package com.lamarsan.excel_demo.model;

import cn.afterturn.easypoi.excel.annotation.Excel;
import cn.afterturn.easypoi.excel.annotation.ExcelTarget;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.io.Serializable;

/** * className: TeacherModel * description: TODO * * @author hasee * @version 1.0 * @date 2019/7/11 17:55 */
@Data
@ExcelTarget("teacherEntity")
@AllArgsConstructor
@NoArgsConstructor
public class TeacherModel implements Serializable {
    private String id;
    /** name */
    @Excel(name = "主讲老师_major,代课老师_absent", orderNum = "1", isImportField = "true_major,true_absent")
    private String name;
}
复制代码

导出

使用构造函数构造相应的几个数据后，编写导出语句。工具

Workbook workbook = ExcelExportUtil.exportExcel(new ExportParams("2412312",  "测试"),CourseModel.class, courseModels);
复制代码

导出结果

导出结果如图所示：

优化与合并：

能够发现，空着并非很好看，能够合并单元格，进行美化操做。

@Excel(name = "课程名称", orderNum = "1",needMerge = true, width = 25)
private String name;

@Excel(name = "主讲老师_major,代课老师_absent",needMerge = true, orderNum = "1", isImportField = "true_major,true_absent")
private String name;
复制代码

结果：

多sheet导出

定义基础配置对象。

导出基本采用ExportParams 这个对象，进行参数配置；咱们须要进行多Sheet导出，那么就须要定义一个基础配置对象。

package com.lamarsan.excel_demo.common;

import cn.afterturn.easypoi.excel.entity.ExportParams;

import java.util.List;

/** * className: ExportView * description: TODO * * @author hasee * @version 1.0 * @date 2019/7/11 18:56 */
public class ExportView {
    public ExportView() {

    }


    private ExportParams exportParams;
    private List<?> dataList;
    private Class<?> cls;

    public ExportParams getExportParams() {
        return exportParams;
    }

    public void setExportParams(ExportParams exportParams) {
        this.exportParams = exportParams;
    }

    public Class<?> getCls() {
        return cls;
    }

    public void setCls(Class<?> cls) {
        this.cls = cls;
    }

    public List<?> getDataList() {
        return dataList;
    }

    public void setDataList(List<?> dataList) {
        this.dataList = dataList;
    }


    public ExportView(Builder builder) {
        this.exportParams = builder.exportParams;
        this.dataList = builder.dataList;
        this.cls = builder.cls;
    }

    public static class Builder {
        private ExportParams exportParams = null;
        private List<?> dataList = null;
        private Class<?> cls = null;

        public Builder() {

        }

        public Builder exportParams(ExportParams exportParams) {
            this.exportParams = exportParams;
            return this;
        }

        public Builder dataList(List<?> dataList) {
            this.dataList = dataList;
            return this;
        }

        public Builder cls(Class<?> cls) {
            this.cls = cls;
            return this;
        }

        public ExportView create() {
            return new ExportView(this);
        }
    }
}
复制代码

解析

最后在实现调用的方法中，对整个集合进行配置和解析。

List<Map<String, Object>> exportParamList = Lists.newArrayList();
ExportView studentView = new ExportView(new ExportParams("学生表","表1",XSSF), studentModelList, StudentModel.class);
ExportView courseView = new ExportView(new ExportParams("课程表","表2",XSSF), courseModelList, CourseModel.class);
List<ExportView> exportViews = new ArrayList<>();
//导入studentlist
exportViews.add(studentView);
//导入courselist
exportViews.add(courseView);
for (ExportView view : exportViews) {
Map<String, Object> valueMap = Maps.newHashMap();
valueMap.put("title", view.getExportParams());
valueMap.put("data", view.getDataList());
valueMap.put("entity", view.getCls());
exportParamList.add(valueMap);
}
// 执行方法
Workbook workBook = ExcelExportUtil.exportExcel(exportParamList, XSSF);
ExcelUtil.downloadExcel(response, workBook, "计算机二班选课状况");
复制代码

导出结果：

Poi

从本小节开始，将脱离easyExcel工具，转而使用POI工具。

导出图片到Excel

1）传入图片IO流，以下所示：

//先把读进来的图片放到一个ByteArrayOutputStream中，以便产生ByteArray

ByteArrayOutputStream byteArrayOut = new ByteArrayOutputStream();

ByteArrayOutputStream byteArrayOut2 = new ByteArrayOutputStream();

ByteArrayOutputStream byteArrayOut3 = new ByteArrayOutputStream();

//将图片读到BufferedImage

bufferImg = ImageIO.read(new File(\"D:\\\\图片\\\\140.png\"));

bufferImg2 = ImageIO.read(new File(\"D:\\\\图片\\\\137.png\"));

bufferImg3 = ImageIO.read(new File(\"D:\\\\图片\\\\139.png\"));

// 将图片写入流中

ImageIO.write(bufferImg, \"png\", byteArrayOut);

ImageIO.write(bufferImg2, \"png\", byteArrayOut2);

ImageIO.write(bufferImg3, \"png\", byteArrayOut3);
复制代码

2）利用Drawing将图片写入EXCEL，以下所示：

Drawing patriarch = sheet.createDrawingPatriarch();
/** * 该构造函数有8个参数 * 前四个参数是控制图片在单元格的位置，分别是图片距离单元格left，top，right，bottom的像素距离 * 后四个参数，前两个表示图片左上角所在的cellNum和 rowNum，后两个参数对应的表示图片右下角所在的cellNum和 rowNum， * excel中的cellNum和rowNum的index都是从0开始的 * */
//图片一导出到单元格B2中
HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0, 0, 0,(short) 7,  4, (short) 8,  5);
HSSFClientAnchor anchor2 = new HSSFClientAnchor(0, 0, 0, 0,(short) 7,  5, (short) 8,  6);
HSSFClientAnchor anchor3 = new HSSFClientAnchor(0, 0, 0, 0,(short) 7,  6, (short) 8,  7);
// 插入图片
patriarch.createPicture(anchor, workBook.addPicture(byteArrayOut.toByteArray(), HSSFWorkbook.PICTURE_TYPE_JPEG));
patriarch.createPicture(anchor2, workBook.addPicture(byteArrayOut2.toByteArray(), HSSFWorkbook.PICTURE_TYPE_JPEG));
patriarch.createPicture(anchor3, workBook.addPicture(byteArrayOut3.toByteArray(), HSSFWorkbook.PICTURE_TYPE_JPEG));
复制代码

4）最终效果以下图所示：

多EXCEL打包

1）编写文件压缩工具类以下，编写srcFiles与zipFile的信息：

package com.lamarsan.excel_demo.utils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

/** * className: ZipMultiFile * description: TODO * * @author hasee * @version 1.0 * @date 2019/7/12 17:46 */
public class ZipMultiFile {
    public static void main(String[] args) {
        File[] srcFiles = { new File("D:\\记事本\\公司\\下载2.xls"), new File("D:\\记事本\\公司\\标书递交_投标文件递交记录表（非物资）.xls") };
        File zipFile = new File("D:\\记事本\\公司\\ZipFile.zip");
        // 调用压缩方法
        zipFiles(srcFiles, zipFile);
    }

    public static void zipFiles(File[] srcFiles, File zipFile) {
        // 判断压缩后的文件存在不，不存在则建立
        if (!zipFile.exists()) {
            try {
                zipFile.createNewFile();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        // 建立 FileOutputStream 对象
        FileOutputStream fileOutputStream = null;
        // 建立 ZipOutputStream
        ZipOutputStream zipOutputStream = null;
        // 建立 FileInputStream 对象
        FileInputStream fileInputStream = null;

        try {
            // 实例化 FileOutputStream 对象
            fileOutputStream = new FileOutputStream(zipFile);
            // 实例化 ZipOutputStream 对象
            zipOutputStream = new ZipOutputStream(fileOutputStream);
            // 建立 ZipEntry 对象
            ZipEntry zipEntry = null;
            // 遍历源文件数组
            for (int i = 0; i < srcFiles.length; i++) {
                // 将源文件数组中的当前文件读入 FileInputStream 流中
                fileInputStream = new FileInputStream(srcFiles[i]);
                // 实例化 ZipEntry 对象，源文件数组中的当前文件
                zipEntry = new ZipEntry(srcFiles[i].getName());
                zipOutputStream.putNextEntry(zipEntry);
                // 该变量记录每次真正读的字节个数
                int len;
                // 定义每次读取的字节数组
                byte[] buffer = new byte[1024];
                while ((len = fileInputStream.read(buffer)) > 0) {
                    zipOutputStream.write(buffer, 0, len);
                }
            }
            zipOutputStream.closeEntry();
            zipOutputStream.close();
            fileInputStream.close();
            fileOutputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}
复制代码

2）压缩结果如图所示：

Zip包解压，获取excel文件并进行分析

1）编写接口以下，主要思路是解压zip，获取每一个文件的io流，而后建立工做簿类获取到每一个类的cell信息：

@PostMapping(value = "/importZip")
private Object importZip(@RequestParam("file") MultipartFile zipFile) {
    //得到文件名
    String fileName = zipFile.getOriginalFilename();
    //检查文件
    if ("".equals(fileName)) {
        System.out.println("文件为空");
    }
    List<List<PoiModel>> poiModelLists = new ArrayList<>();
    try {
        //再本地建立一个文件，读取此文件 防止浏览器读取的文件被损坏
        File localFile = new File("D:\\记事本\\公司\\fyJyqdYhqdxxZip.zip");
        FileOutputStream ftpOutstream = new FileOutputStream(localFile);
        byte[] appByte = zipFile.getBytes();
        ftpOutstream.write(appByte);
        ftpOutstream.flush();
        ftpOutstream.close();//建立完毕后删除

        File file = new File("D:\\记事本\\公司\\fyJyqdYhqdxxZip.zip");
        //不解压直接读取,加上UTF-8解决乱码问题,file转ZipInputStream
        ZipInputStream in = new ZipInputStream(new FileInputStream(file), Charset.forName("GBK"));
        //不解压直接读取,加上UTF-8解决乱码问题,ZipInputStream转BufferedReader
        BufferedReader br = new BufferedReader(new InputStreamReader(in, "gbk"));
        //把InputStream转成ByteArrayOutputStream 屡次使用
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ZipEntry ze;
        while ((ze = in.getNextEntry()) != null) {
            if (ze.isDirectory()) {
                //若是是目录，不处理
                continue;
            }
            try {
                String zipFileName = ze.getName();
                //不是咱们指定的文件不导入，XXXXX.市场化清单.xls
                //if (zipFileName != null && zipFileName.indexOf(".") != -1
                // && zipFileName.equals(zipFileName.substring(0, zipFileName.indexOf(".xls")) + "市场化清单.xls")) {
                // continue;
                //}
                byte[] buffer = new byte[1024];
                int len;
                while ((len = in.read(buffer)) > -1) {
                    baos.write(buffer, 0, len);
                }
                baos.flush();

                InputStream stream = new ByteArrayInputStream(baos.toByteArray());
                //获取Excel对象
                HSSFWorkbook wb = new HSSFWorkbook(stream);
                int sheets = wb.getNumberOfSheets();
                for (int i = 0; i < sheets; i++) {
                    HSSFSheet sheet = wb.getSheetAt(i);
                    // 获取多少行
                    List<PoiModel> poiModels = new ArrayList<>();
                    int rows = sheet.getPhysicalNumberOfRows();
                    for (int j = 0; j < rows; j++) {
                        //获取Row对象
                        HSSFRow row = sheet.getRow(j);
                        //获取Cell对象的值并输出
                        PoiModel poiModel = new PoiModel(row.getCell(0).toString(), row.getCell(1).toString(), row.getCell(2).toString(), row.getCell(3).toString(), row.getCell(4).toString(), row.getCell(5).toString(), row.getCell(6).toString(), row.getCell(7).toString(), row.getCell(8).toString(), row.getCell(9).toString(), row.getCell(10).toString());
                        System.out.println(row.getCell(0) + " " + row.getCell(1));
                        poiModels.add(poiModel);
                    }
                    poiModelLists.add(poiModels);
                }
                baos.reset();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        br.close();
        in.close();
        baos.close();
        //处理完毕删除
        localFile.delete();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return poiModelLists;
}
复制代码

2）返回结果以下：

项目github地址： github.com/lamarsan/ex…