Java web 前端頁面瀏覽器導出excel

js代碼 使用input隱藏域提交json數據

ids = ids.substr(0,ids.length-1);
keys = keys.substr(0,keys.length-1);
columnNames = columnNames.substr(0,columnNames.length-1);
var sParms = {
    ids: ids,
    keys: keys,
    columnNames: columnNames
};
var parametersStr = JSON.stringify(sParms).toString();
console.log(parametersStr);
var url = "/exch_platform/cashInfo/export";
//創建隱藏表單
exportForm = document.createElement("form");
exportForm.setAttribute('id',"_exportForm");
exportForm.setAttribute("action", url);
exportForm.setAttribute("method", "post");


//對應查詢條件的開始時間
var input1 = document.createElement("input");
input1.type="text";
input1.name = "idsP";
input1.value = parametersStr;
exportForm.append(input1);

document.body.appendChild(exportForm);
exportForm.submit();

 

Java後端接收並處理參數

@RequestMapping(value = "/export",method = RequestMethod.POST)
public void export(HttpServletRequest request, HttpServletResponse response) {
    String idsP = request.getParameter("idsP");
    JSONObject jsonObject = JSONObject.parseObject(idsP);
    String idStr = jsonObject.getString("ids");
    String[] ids = new String[0];
    if(StringUtils.isNoneEmpty(idStr)){
        ids = idStr.split(",");
    }
    String keys = jsonObject.getString("keys");
    String columnNames = jsonObject.getString("columnNames");
    cashInfoService.selectByConditionToExport(request, response, ids);
}

service層處理數據

 

excel導出工具類

public static void downloadExcel(HttpServletResponse response, String fileName,
                                    List<Map<String,Object>> list, String[] keys, String[] columnNames) throws UnsupportedEncodingException, IOException {
   ByteArrayOutputStream os = new ByteArrayOutputStream();
       try {
           ExcelUtil.createWorkBook(list,keys,columnNames).write(os);
       } catch (IOException e) {
           e.printStackTrace();
       }
       byte[] content = os.toByteArray();
       InputStream is = new ByteArrayInputStream(content);
       // 設置response參數，可以打開下載頁面
       response.reset();
       response.setContentType("application/vnd.ms-excel;charset=utf-8");
       response.setHeader("Content-Disposition", "attachment;filename="+ new String((fileName + ".xls").getBytes(), "iso-8859-1"));
       ServletOutputStream out = response.getOutputStream();
       BufferedInputStream bis = null;
       BufferedOutputStream bos = null;
       try {
           bis = new BufferedInputStream(is);
           bos = new BufferedOutputStream(out);
           byte[] buff = new byte[2048];
           int bytesRead;
           while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
               bos.write(buff, 0, bytesRead);
           }
       } catch (final IOException e) {
           throw e;
       } finally {
           if (bis != null)
               bis.close();
           if (bos != null)
               bos.close();
       }
}

 

將數據寫入excel

    /**
     * 創建excel文檔，
     * @param list 數據
     * @param keys list中map的key數組集合
     * @param columnNames excel的列名
     * */
    public static Workbook createWorkBook(List<Map<String, Object>> list,String []keys,String columnNames[]) {
        // 創建excel工作簿
        Workbook wb = new HSSFWorkbook();
        // 創建第一個sheet（頁），並命名
        //Sheet sheet = wb.createSheet(list.get(0).get("sheetName").toString());
        Sheet sheet = wb.createSheet("sheet1");
        // 手動設置列寬。第一個參數表示要爲第幾列設；，第二個參數表示列的寬度，n爲列高的像素數。
        for(int i=0;i<keys.length;i++){
            sheet.setColumnWidth((short) i, (short) (35.7 * 150));
        }

        // 創建第一行
        Row row = sheet.createRow((short) 0);

        // 創建兩種單元格格式
        CellStyle cs = wb.createCellStyle();
        CellStyle cs2 = wb.createCellStyle();

        // 創建兩種字體
        Font f = wb.createFont();
        Font f2 = wb.createFont();

        // 創建第一種字體樣式（用於列名）
        f.setFontHeightInPoints((short) 10);
        f.setColor(IndexedColors.BLACK.getIndex());
        f.setBoldweight(Font.BOLDWEIGHT_BOLD);

        // 創建第二種字體樣式（用於值）
        f2.setFontHeightInPoints((short) 10);
        f2.setColor(IndexedColors.BLACK.getIndex());

//        Font f3=wb.createFont();
//        f3.setFontHeightInPoints((short) 10);
//        f3.setColor(IndexedColors.RED.getIndex());

        // 設置第一種單元格的樣式（用於列名）
        cs.setFont(f);
        cs.setBorderLeft(CellStyle.BORDER_THIN);
        cs.setBorderRight(CellStyle.BORDER_THIN);
        cs.setBorderTop(CellStyle.BORDER_THIN);
        cs.setBorderBottom(CellStyle.BORDER_THIN);
        cs.setAlignment(CellStyle.ALIGN_CENTER);

        // 設置第二種單元格的樣式（用於值）
        cs2.setFont(f2);
        cs2.setBorderLeft(CellStyle.BORDER_THIN);
        cs2.setBorderRight(CellStyle.BORDER_THIN);
        cs2.setBorderTop(CellStyle.BORDER_THIN);
        cs2.setBorderBottom(CellStyle.BORDER_THIN);
        cs2.setAlignment(CellStyle.ALIGN_CENTER);
        //設置列名
        for(int i=0;i<columnNames.length;i++){
            Cell cell = row.createCell(i);
            /**
             * 對括號進行轉義 add by 白毅
             */
            if(columnNames[i].indexOf("& #41;") != -1){
                columnNames[i] = columnNames[i].replaceAll("& #40;","(");
                columnNames[i] = columnNames[i].replaceAll("& #41;",")");
            }
            cell.setCellValue(StringEscapeUtils.unescapeJava(columnNames[i]));
            cell.setCellStyle(cs);
        }
        //設置每行每列的值
        for (int i = 1; i <= list.size(); i++) {
            // Row 行,Cell 方格 , Row 和 Cell 都是從0開始計數的
            // 創建一行，在頁sheet上
            Row row1 = sheet.createRow((int) i);
            // 在row行上創建一個方格
            for(short j=0;j<keys.length;j++){
                Cell cell = row1.createCell(j);
                if(list.get(i-1).get(keys[j]) != null){
                    if(StringUtils.isNoneEmpty(list.get(i-1).get(keys[j]).toString()) && BusinessUtils.isNumeric(list.get(i-1).get(keys[j]).toString())){
                        cell.setCellValue(BusinessUtils.rvZeroAndDot(list.get(i-1).get(keys[j]).toString()));
                    }else{
                        cell.setCellValue(list.get(i-1).get(keys[j]) == null ? " " : list.get(i-1).get(keys[j]).toString());
                    }
                }else{
                    cell.setCellValue(list.get(i-1).get(keys[j]) == null ? " " : list.get(i-1).get(keys[j]).toString());
                }
                cell.setCellStyle(cs2);
            }
        }
        return wb;
    }