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【超级简单】SpringBoot+poi实现excel导入导出

alibb • 2022-12-17 • 随笔 • 阅读 34

【超级简单】SpringBoot+poi实现excel导入导出,第1张

【超级简单】SpringBoot+poi实现excel导入导出

一、pom引入

  
            org.apache.poi
            poi
            RELEASE
        
        
            org.apache.poi
            poi-ooxml
            RELEASE
        

        
            org.springframework.boot
            spring-boot-starter-thymeleaf

二、实体类

package com.re.r.pojo;


import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.experimental.Accessors;

import java.io.Serializable;



@Data
@EqualsAndHashCode(callSuper = false)
@Accessors(chain = true)
public class Teacher implements Serializable {

    private Integer id;

    private String teaNo;

    private String teaName;

}

三、ExcelUntil类

package com.re.r.until;


import com.re.r.pojo.Teacher;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.*;
import org.apache.poi.xssf.usermodel.extensions.XSSFCellBorder;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import java.awt.Color;
import java.net.URLEncoder;

public class ExcelUtils2 {
    public static void exportExcel(HttpServletResponse response, String fileName, ExcelData data) throws Exception {
        // 告诉浏览器用什么软件可以打开此文件
        response.setHeader("content-Type", "application/vnd.ms-excel");
        // 下载文件的默认名称
        response.setHeader("Content-Disposition", "attachment;filename="+URLEncoder.encode(fileName, "utf-8"));
        exportExcel(data, response.getOutputStream());
    }

    public static void exportExcel(ExcelData data, OutputStream out) throws Exception {

        XSSFWorkbook wb = new XSSFWorkbook();
        try {
            String sheetName = data.getName();
            if (null == sheetName) {
                sheetName = "Sheet1";
            }
            XSSFSheet sheet = wb.createSheet(sheetName);
            writeExcel(wb, sheet, data);

            wb.write(out);
        } catch(Exception e){
            e.printStackTrace();
        }finally{
            //此处需要关闭 wb 变量
            out.close();
        }
    }

    private static void writeExcel(XSSFWorkbook wb, Sheet sheet, ExcelData data) {

        int rowIndex = 0;

        rowIndex = writeTitlesToExcel(wb, sheet, data.getTitles());
        writeRowsToExcel(wb, sheet, data.getRows(), rowIndex);
        autoSizeColumns(sheet, data.getTitles().size() + 1);

    }

    private static int writeTitlesToExcel(XSSFWorkbook wb, Sheet sheet, List titles) {
        int rowIndex = 0;
        int colIndex = 0;

        XSSFFont titleFont = wb.createFont();
        titleFont.setFontName("simsun");
        titleFont.setColor(IndexedColors.BLACK.index);
        XSSFCellStyle titleStyle = wb.createCellStyle();
       // titleStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
       // titleStyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
        //titleStyle.setFillForegroundColor(new XSSFColor(new Color(182, 184, 192)));
       // titleStyle.setFillPattern(XSSFCellStyle.SOLID_FOREGROUND);
        titleStyle.setFont(titleFont);
        //setBorder(titleStyle, BorderStyle.THIN, new XSSFColor(new Color(0, 0, 0)));

        Row titleRow = sheet.createRow(rowIndex);
        colIndex = 0;

        for (String field : titles) {
            Cell cell = titleRow.createCell(colIndex);
            cell.setCellValue(field);
            cell.setCellStyle(titleStyle);
            colIndex++;
        }

        rowIndex++;
        return rowIndex;
    }

    private static int writeRowsToExcel(XSSFWorkbook wb, Sheet sheet, List> rows, int rowIndex) {
        int colIndex = 0;
        XSSFFont dataFont = wb.createFont();
        dataFont.setFontName("simsun");
        dataFont.setColor(IndexedColors.BLACK.index);
        XSSFCellStyle dataStyle = wb.createCellStyle();
        //dataStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
        //dataStyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
        dataStyle.setFont(dataFont);
       // setBorder(dataStyle, BorderStyle.THIN, new XSSFColor(new Color(0, 0, 0)));

        for (List rowdata: rows) {
            Row dataRow = sheet.createRow(rowIndex);
            colIndex = 0;

            for (Object celldata: rowData) {
                Cell cell = dataRow.createCell(colIndex);
                if (cellData != null) {
                    cell.setCellValue(cellData.toString());
                } else {
                    cell.setCellValue("");
                }

                cell.setCellStyle(dataStyle);
                colIndex++;
            }
            rowIndex++;
        }
        return rowIndex;
    }

    private static void autoSizeColumns(Sheet sheet, int columnNumber) {

        for (int i = 0; i < columnNumber; i++) {
            int orgWidth = sheet.getColumnWidth(i);
            sheet.autoSizeColumn(i, true);
            int newWidth = (int) (sheet.getColumnWidth(i) + 100);
            if (newWidth > orgWidth) {
                sheet.setColumnWidth(i, newWidth);
            } else {
                sheet.setColumnWidth(i, orgWidth);
            }
        }
    }

    private static void setBorder(XSSFCellStyle style, BorderStyle border, XSSFColor color) {
        style.setBorderTop(border);
        style.setBorderLeft(border);
        style.setBorderRight(border);
        style.setBorderBottom(border);
        style.setBorderColor(XSSFCellBorder.BorderSide.TOP, color);
        style.setBorderColor(XSSFCellBorder.BorderSide.LEFT, color);
        style.setBorderColor(XSSFCellBorder.BorderSide.RIGHT, color);
        style.setBorderColor(XSSFCellBorder.BorderSide.BOTTOM, color);
    }



   //导入方法
   public static List excel2Supplier(MultipartFile file) throws IOException {
        List list = new ArrayList<>();
        Teacher supplier = null;
        try {
            //1. 创建一个 workbook 对象
            HSSFWorkbook workbook = new HSSFWorkbook(file.getInputStream());
            //2. 获取 workbook 中表单的数量
            int numberOfSheets = workbook.getNumberOfSheets();
            for (int i = 0; i < numberOfSheets; i++) {
                //3. 获取表单
                HSSFSheet sheet = workbook.getSheetAt(i);
                //4. 获取表单中的行数
                int physicalNumberOfRows = sheet.getPhysicalNumberOfRows();
                for (int j = 0; j < physicalNumberOfRows; j++) {
                    //5. 跳过标题行
                    if (j == 0) {
                        continue;//跳过标题行
                    }
                    //6. 获取行
                    HSSFRow row = sheet.getRow(j);
                    if (row == null) {
                        continue;//防止数据中间有空行
                    }
                    //7. 获取列数
                    int physicalNumberOfCells = row.getPhysicalNumberOfCells();
                    supplier = new Teacher();
                    for (int k = 0; k < physicalNumberOfCells; k++) {
                        HSSFCell cell = row.getCell(k);
                        //按照每一列的不同类型 获取数据
                        switch (cell.getCellType()) {
                            //如果是String类型
                            case STRING:
                                String cellValue = cell.getStringCellValue();
                                switch (k) {//看它是第几列的内容
                                    case 0:
                                        supplier.setTeaName(cellValue);
                                        break;
                                    case 1:
                                        supplier.setTeaNo(cellValue);
                                        break;
                                    //省略其他的 case
                                }
                                break;
                            case NUMERIC:
                                int intValue = (int) cell.getNumericCellValue();
                                switch (k) {//看它是第几列的内容
                                    case 2:
                                        supplier.setId(intValue);
                                        break;

                                    //省略其他的 case
                                }
                                break;

                            default: {
                                switch (k) {
                                    //不同类型的获取函数不同：
                                    //日期类型：getDateCellValue()
                                    //数字类型：getNumericCellValue()，返回double值
//                                    case 18:
//                                        supplier.setStatus((int) cell.getNumericCellValue());
                                    //break;
                                    //省略其他的 case
                                }
                            }
                            break;
                        }
                    }
                    list.add(supplier);
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        //返回搜集好数据的List
        return list;
    }
}
 

 

四、controller测试一下
 

templates建立上传前端文件
 




    
    
    
    上传





 

package com.re.r.controller;

import com.re.r.pojo.Teacher;
import com.re.r.until.ExcelData;
import com.re.r.until.ExcelUtils2;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import static org.apache.tomcat.util.bcel.classfile.ElementValue.STRING;


@Controller
public class UploadController {

    

    @PostMapping("/importSup")
    @ResponseBody
    public String importSup(@RequestParam(value = "file") MultipartFile file) throws IOException {
        //获取数据集合
        List suppliers = ExcelUtils2.excel2Supplier(file);
        System.out.println(file.getOriginalFilename());
        System.out.println(suppliers);
        return " *** 作成功";
        //插入数据库
        //supplierService.addSuppliers(suppliers);
    }


    @RequestMapping("/index1")
    public String indexHtml() {
        return "index";
    }


    
        @RequestMapping(value = "/export", method = RequestMethod.GET)
        public void excel(HttpServletResponse response) throws Exception {
            ExcelData data = new ExcelData();
            data.setName("hello");
            List titles = new ArrayList();
            titles.add("a1");
            titles.add("a2");
            titles.add("a3");
            data.setTitles(titles);

            List> rows = new ArrayList();
            List row = new ArrayList();
            row.add("11111111111");
            row.add("22222222222");
            row.add("3333333333");
            rows.add(row);

            data.setRows(rows);

            //生成本地
//            File f = new File("F:\test.xlsx");
//            FileOutputStream out = new FileOutputStream(f);
//            ExcelUtils2.exportExcel(data, out);
//            out.close();

        //下载
        SimpleDateFormat fdate=new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");
        String fileName=fdate.format(new Date())+".xls";
        ExcelUtils2.exportExcel(response,fileName,data);

        }


    }


 

上传（导入）测试结果
 

 

 导出测试结果
 

 
 

简单excel导入导出的就搞定了 ！！！！是不是很简单！！！
					
										


					

						
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