java 讀取資料庫資料並下載為Excel

前臺

html

<input type="button" id="javaExcel" value="java下載表格">

script

<script>
    $("#javaExcel").click(function () {
        $.ajax({
            type: "POST",
            url: "../java/excel",
            data:{name:"javaExcel"},
            dataType: "json"
 
,
            success: function (data) {
                alert(data.status);
            },
            error:function () {
                alert("錯誤")
            }
        });
    })
</script>

controller

private Map excel(){
        Map map =new HashMap();
        map.put("status","false"
 
);
        try {
            log.info("recent inactive hospital statistics start");
            //命名行名
            List<String> cellNameList = new ArrayList<>();
            cellNameList.add("醫院id");
            cellNameList.add("醫院名稱");
            cellNameList.add("渠道號");
            cellNameList.add
 
("聯絡人");
            cellNameList.add("總關注數");
            cellNameList.add("不活躍天數");
            cellNameList.add("最後活躍日期");
            cellNameList.add("申請日期");
            cellNameList.add("建立天數");
            //給檔案命名及設定路徑,如果該路徑下有該檔案則覆蓋該檔案
            String excelPath="/Users/user/Desktop/不活潑醫院資訊.xls";
            //給表命名
            String title=LocalDate.now().minusDays(14)+"至"+LocalDate.now().minusDays(8)+"不活潑醫院資訊";
            HSSFWorkbook excel = Excel.createExcel(title, cellNameList);
            //寫資料，這裡隨便寫點資料（可以從資料庫讀資料然後迴圈寫）
            for(int i=1;i<5;i++){
                List<String> excelData = new ArrayList<>();
                excelData.add(i+"");
                excelData.add("name");
                excelData.add(i+"");
                excelData.add("聯絡人");
                excelData.add("總關注數");
                excelData.add("不活躍天數");
                excelData.add("最後活躍日期");
                excelData.add("申請日期");
                excelData.add("建立天數");
                excel = Excel.createExcelData(excel, excelData, i);
            }
            //輸出資料
            FileOutputStream fos = new FileOutputStream(excelPath);
            excel.write(fos);
            fos.close();
            map.put("status","true");
        } catch (Exception e) {
            e.printStackTrace();
        }

        return map;
    }

util包的工具類

public class Excel {

    public static HSSFWorkbook createExcel(String sheetName, List<String> cellNameList) {

        HSSFWorkbook excel = new HSSFWorkbook();
        HSSFSheet sheet = excel.createSheet(sheetName);
        HSSFRow row = sheet.createRow(0);
        int cellIndex = 0;
        for (String cellName : cellNameList) {
            HSSFCell cell = row.createCell(cellIndex);
            cell.setCellValue(cellName);
            cellIndex++;
        }
        return excel;
    }

    public static HSSFWorkbook createExcelData(HSSFWorkbook excel, List<String> excelData,int rowIndex){
        HSSFRow row=excel.getSheetAt(0).createRow(rowIndex);
        for(int i = 0; i < excelData.size(); i++){
            row.createCell(i).setCellValue(excelData.get(i));
        }
        return excel;
    }


}