SpringBoot如何實現導出Excel表格

我們查到的數據是list，如何將這些數據導出到Excel表格中呢

我這裏查到的list數據是 List monthReportModels

一、導入依賴

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>3.6</version>
</dependency>

二、生成表格
根據數據以及一些屬性，生成表格，並設置表格的一些屬性

 public HSSFWorkbook getHSSFWorkbook(String sheetName, String[] title, String[][] values, HSSFWorkbook workbook) {
    // 創建一個HSSFWorkbook，對應一個Excel文件
    if (workbook == null) {
        workbook = new HSSFWorkbook();
    }
    // 在workbook中添加一個sheet,對應Excel文件中的sheet
    HSSFSheet sheet = workbook.createSheet(sheetName);
    // 在sheet中添加表頭第0行
    HSSFRow row = sheet.createRow(0);
    // 創建單元格，並設置值表頭 設置表頭居中
    HSSFCellStyle cellStyle = workbook.createCellStyle();
    cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
    // 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(cellStyle);
    }
    // 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 workbook;

}

三、設置發送響應流

public void setResponseHeader(HttpServletResponse response, String fileName) {
  try {
        fileName = new String(fileName.getBytes(), "ISO8859-1");
        response.setContentType("application/octet-stream;charset=ISO8859-1");
        response.setHeader("Content-Disposition", "attachment;filename=" + fileName);
        response.addHeader("Pargam", "no-cache");
        response.addHeader("Cache-Control", "no-cache");
    } catch (Exception e) {
        e.printStackTrace();
    }
}

四、處理list數據
將list數據處理成二維數組，設置Excel標題，以及Excel文件名，Excel的Sheet名，以供生成表格

public void exportExcel(HttpServletResponse response, List<MonthReportModel> monthReportModels) {
    // Excel標題
    String[] title = {"姓名", "違紀次數", "違紀原因", "請假次數", "請假類型", "請假累計時間（小時）", "請假原因描述"};
    // Excel文件名
    String fileName =  "請假統計.xls";
    // sheet名
    String sheetName = "請假統計";
    // 將數據放到數組中
    String[][] content = new String[monthReportModels.size()][title.length];
    for (int i = 0; i < monthReportModels.size(); i++) {
        MonthReportModel monthReportModel = monthReportModels.get(i);
        content[i][0] = monthReportModel.getUserName();
        content[i][1] = monthReportModel.getDisobedientNum();
        content[i][2] = monthReportModel.getDisobedientReason();
        content[i][3] = monthReportModel.getLeaveNum();
        content[i][4] = monthReportModel.getLeaveType();
        content[i][5] = monthReportModel.getLeaveTime() + "小時";
        content[i][6] = monthReportModel.getLeaveReason();
    }
    // 導出Excel
    try {
        HSSFWorkbook hssfWorkbook = getHSSFWorkbook(sheetName, title, content, null);
        setResponseHeader(response, fileName);
        OutputStream outputStream = response.getOutputStream();
        hssfWorkbook.write(outputStream);
        outputStream.flush();
        outputStream.close();
    } catch (Exception e) {
        e.printStackTrace();
    }

}