JAVA將數據庫數據導出為Excel

前注：來源於網絡

描述：客戶端通過HTTP的GET方式請求，在后台處理並從數據庫中查詢到數據列表，最終將數據列表生成HTTP相應流返回到客戶端，客戶端即實現對數據的Excel導出。

 

1. 依賴

<!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>3.6</version>
</dependency>

 

2. 工具類

package com.xfc.util;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

/**
 * @Auther: xfc
 * @Date: 2019/5/20 0020 14:21
 * @Description:
 */
public class ExcelUtil {

    /**
     * 導出Excel
     *
     * @param sheetName sheet名稱
     * @param title     標題
     * @param values    內容
     * @param wb        HSSFWorkbook對象
     * @return
     */
    public static HSSFWorkbook getHSSFWorkbook(String sheetName, String[] title, String[][] values, HSSFWorkbook wb) {

        // 第一步，創建一個HSSFWorkbook，對應一個Excel文件
        if (wb == null)
            wb = new HSSFWorkbook();

        // 第二步，在workbook中添加一個sheet,對應Excel文件中的sheet
        HSSFSheet sheet = wb.createSheet(sheetName);

        // 第三步，在sheet中添加表頭第0行,注意老版本poi對Excel的行數列數有限制
        HSSFRow row = sheet.createRow(0);

        // 第四步，創建單元格，並設置值表頭 設置表頭居中
        HSSFCellStyle style = wb.createCellStyle();
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 創建一個居中格式

        //聲明列對象
        HSSFCell cell = null;

        //創建標題
        for (int i = 0; i < title.length; i++) {
            cell = row.createCell(i);
            cell.setCellValue(title[i]);
            cell.setCellStyle(style);
        }

        //創建內容
        for (int i = 0; i < values.length; i++) {
            row = sheet.createRow(i + 1);
            for (int j = 0; j < values[i].length; j++) {
                //將內容按順序賦給對應的列對象
                row.createCell(j).setCellValue(values[i][j]);
            }
        }
        return wb;
    }
}

 

3. 調用

因為業務簡單，我這里在controller層就直接處理了

    /**
     * 根據條件將數據導出為Excel
     * 如果需要瀏覽器發送請求時即下載Excel，就不能用ajax進行傳輸，所以這里用GET方式進行提交
     *
     * @return
     */
    @ResponseBody
    @RequestMapping(value = "/exportExcel", method = RequestMethod.GET)
    public void exportExcel(HttpServletRequest request, HttpServletResponse response) {
        QRRecord obj = new QRRecord();
        obj.setPageStart(Integer.valueOf(request.getParameter("pageStart")));
        obj.setPageSize(Integer.valueOf(request.getParameter("pageSize")));
        obj.setTerm(request.getParameter("term"));
        List<QRRecord> list = qrRecordService.findQRRecordList(obj);
        String[] title = {"ID", "業主姓名", "識別時間", "設備名稱", "識別位置", "目的樓層", "備注信息"};
        String filename = "QRCodeRecord.xls";
        String sheetName = "sheet1";
        String[][] content = new String[list.size()][7];
        try {
            for (int i = 0; i < list.size(); i++) {
                content[i][0] = String.valueOf(list.get(i).getRid());
                content[i][1] = list.get(i).getOwnerName();
                content[i][2] = list.get(i).getAddTime();
                content[i][3] = list.get(i).getDeviceName();
                content[i][4] = list.get(i).getLocation();
                content[i][5] = String.valueOf(list.get(i).getAimFloor());
                content[i][6] = list.get(i).getDescription();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        HSSFWorkbook wb = ExcelUtil.getHSSFWorkbook(sheetName, title, content, null);
        try {
            // 響應到客戶端
            this.setResponseHeader(response, filename);
            OutputStream os = response.getOutputStream();
            wb.write(os);
            os.flush();
            os.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 向客戶端發送響應流方法
     *
     * @param response
     * @param fileName
     */
    public void setResponseHeader(HttpServletResponse response, String fileName) {
        try {
            try {
                fileName = new String(fileName.getBytes(), "UTF-8");
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
            response.setContentType("application/vnd.ms-excel");
            response.setHeader("Content-disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

 

4. JS調用

let url = "localhost:808//.../.../exportExcel?pageStart=0&pageSize=50";
location.href = url;

 

5. 成功后，即通過瀏覽器進行下載

 

 

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