Java处理Excel操作

前端

Export() {
      let pointEMT =["EMT.APProductionKWH3","EMT.APProductionKWH1"];
      let pointPCS =["PCS.TotalChargePowerkWh","PCS.TotalDischargePowerkWh"];
      let pointEMS =["BMS.Voltage","BMS.Current""];
      let data={
            "site_id":"1bcaecdcc4002000",
            "interval": "60",
            "begin_time": "2018-07-10 15:15:10",
            "end_time": "2018-07-10 17:15:10",
            "objects":[{ "object_id": ["1bcac6635a804000","1bcae31be3800000"], "domain_id": "348","point":pointPCS}]
      }; 
      let baseUrl = process.env.API_ROOT;
      let apilUrl = "//172.20.34.19:8082" + "/api/downExcel";
      axios({
        // 用axios发送post请求
        method: "post",
        url: apilUrl, // 请求地址
        data: data, // 参数
        responseType: "arraybuffer" // 表明返回服务器返回的数据类型
      }).then(res => {
        debugger
        // 处理返回的文件流
        console.log(res);
        let time = new Date();
        let year = time.getFullYear();
        let month = time.getMonth() + 1;
        let day = time.getDate();
        let fileName =this.form.name+".xlsx";
        let fileDownload = require("js-file-download");
        //fileDownload(response.data, vm.ascii2native(response.headers['x-suggested-filename']))
         fileDownload(res.data, fileName);
      });
    },

后端

public void outSheet(HttpServletRequest request, HttpServletResponse response, List<Encapsula> listTitle, List<SingleRow> singleRowList)throws Exception {
    //1.创建工作簿
    SXSSFWorkbook workbook = new SXSSFWorkbook(100);
    //2.创建工作表7
    SXSSFSheet sheet = (SXSSFSheet) workbook.createSheet("数据导出");
    //设置默认列宽
    sheet.setDefaultColumnWidth(20);

    //1.1标题样式
    XSSFCellStyle colStyle = createCellStyle(workbook,(short)10,true,true);
    //内容样式
    XSSFCellStyle cellStyle = createCellStyle(workbook,(short)10,false,true);

    //2.创建合并单元格对象
    //标题、时间
    CellRangeAddress callRangeAddress = new CellRangeAddress(0,1,0,0);//起始行,结束行,起始列,结束列
    sheet.addMergedRegion(callRangeAddress);

    SXSSFRow row = (SXSSFRow) sheet.createRow(0);
    SXSSFCell cell = (SXSSFCell) row.createCell(0);
    //加载单元格样式
    cell.setCellStyle(colStyle);
    cell.setCellValue("时间");
    row = (SXSSFRow) sheet.createRow(1);
    cell = (SXSSFCell) row.createCell(0);
    cell.setCellValue(" ");

    //主表头
    SXSSFRow hssfRow2 = (SXSSFRow) sheet.getRow(0);
    if (hssfRow2 == null) {
      hssfRow2 = (SXSSFRow) sheet.createRow(0);
    }
    int viceTitle = 0;
    for(int i = 0; i < listTitle.size(); i++){
      for(int j = 0; j < listTitle.get(i).getDevice_names().size(); j++){
        viceTitle++;
        SXSSFCell cell2 = (SXSSFCell) hssfRow2.createCell(viceTitle);
        cell2.setCellValue(listTitle.get(i).getDevice_names().get(j));
        cell2.setCellStyle(colStyle);
      }
    }

    //副表头
    SXSSFRow hssfRow1 = (SXSSFRow) sheet.getRow(1);
    if (hssfRow1 == null) {
      hssfRow1 = (SXSSFRow) sheet.createRow(1);
    }
    int primaryTitle = 0;
    for(int i = 0; i < listTitle.size(); i++){
      String name = listTitle.get(i).getDesc();
      for(int j = 0; j < listTitle.get(i).getDevice_names().size(); j++){
        primaryTitle++;
        SXSSFCell cell1 = (SXSSFCell) hssfRow1.createCell(primaryTitle);
        cell1.setCellValue(name);
        cell1.setCellStyle(colStyle);
      }
    }

    //填写数据单元格
    SXSSFRow hssfRow = (SXSSFRow) sheet.getRow(0);
    if (hssfRow == null) {
      hssfRow = (SXSSFRow) sheet.createRow(0);
    }
    for(int i = 0; i < singleRowList.size(); i++){
      SingleRow singleRow = new SingleRow();
      singleRow = singleRowList.get(i);
      hssfRow = (SXSSFRow) sheet.createRow(i+2);
      SXSSFCell singleCell = (SXSSFCell) hssfRow.createCell(0);
      singleCell.setCellValue(singleRow.getTimestamp());
      for(int j = 0; j < singleRow.getValues().size(); j++){
        singleCell = (SXSSFCell) hssfRow.createCell(j+1);
        if(singleRow.getValues().get(j).equals("--") || singleRow.getValues().get(j).equals(" ")){
          singleCell.setCellValue( singleRow.getValues().get(j));
        }else {
          singleCell.setCellValue(Double.valueOf( singleRow.getValues().get(j)));
        }
        singleCell.setCellStyle(cellStyle);
      }
    }
    //5.输出
    writeExcel(response, workbook);
    //关闭流
    System.out.println("导出成功");

  }


public XSSFCellStyle createCellStyle(SXSSFWorkbook workbook, short fontsize,boolean flag, boolean flag1) {
    // TODO Auto-generated method stub
    XSSFCellStyle style = (XSSFCellStyle) workbook.createCellStyle();
    //是否水平居中
    if(flag1){
      style.setAlignment(HSSFCellStyle.ALIGN_CENTER);//水平居中
    }
    style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);//垂直居中
    // 生成一个字体
    XSSFFont font = (XSSFFont) workbook.createFont();
    // 指定当单元格内容显示不下时自动换行
    style.setWrapText(true);
    //是否加粗字体
    if(flag){
      font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
    }
    font.setFontHeightInPoints(fontsize);
    //把字体应用到当前的样式
    style.setFont(font);
    return style;
  }

private void writeExcel(HttpServletResponse response, Workbook work) throws IOException {
    OutputStream out = null;
    try {
      out = response.getOutputStream();
      //response.reset();// 清空输出流
      response.setContentType("application/vnd.ms-excel;charset=utf-8");
      response.setHeader("Access-Control-Allow-Origin", "*");
      work.write(out);
    } catch (IOException e) {
      System.out.println("输出流错误");
      e.printStackTrace();
    } finally {
      out.flush();
      out.close();
    }
  }