Java后台 查询数据库数据保存到Excel中，供客户端下载。

Java后台 查询数据库数据保存到Excel中，供客户端下载。

1. 创建实体来，根据需要保存的字段进行实体类的创建

1. 编码你的工具类

/发票查询保存Excel
public HSSFWorkbook export(List list) {
    String[] excelHeader = {"提单号", "船名", "航次", "船期", "起运港", "目的港", "费用项目", "币别", "金额", "发票号", "订舱人",
            "销售", "发票日期"};
    HSSFWorkbook wb = new HSSFWorkbook();
    //创建HSSFSheet对象
    HSSFSheet sheet = wb.createSheet("审核信息表");
    HSSFRow row = sheet.createRow((int) 0);
    HSSFCellStyle style = wb.createCellStyle();
    style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
    for (int i = 0; i < excelHeader.length; i++) {
        HSSFCell cell = row.createCell(i);
        cell.setCellValue(excelHeader[i]);
        cell.setCellStyle(style);
        sheet.autoSizeColumn(i);
        //设置指定列的列宽，256 * 50这种写法是因为width参数单位是单个字符的256分之一
        sheet.setColumnWidth(cell.getColumnIndex(), 100 * 50);
    }
    for (int i = 0; i < list.size(); i++) {
        row = sheet.createRow(i + 1);
        ExcelInformation applyCard = list.get(i);
        row.createCell(0).setCellValue(applyCard.getOblno());
        row.createCell(1).setCellValue(applyCard.getVessel());
        row.createCell(2).setCellValue(applyCard.getVoy());
        row.createCell(3).setCellValue(applyCard.getEtd());
        row.createCell(4).setCellValue(applyCard.getPortload());
        row.createCell(5).setCellValue(applyCard.getPortdis());
        row.createCell(6).setCellValue(applyCard.getName());
        row.createCell(7).setCellValue(applyCard.getMoneytype());
        row.createCell(8).setCellValue(applyCard.getMoney_sj());
        row.createCell(9).setCellValue(applyCard.getInvoiceno());
        row.createCell(10).setCellValue(applyCard.getUsername());
        row.createCell(11).setCellValue(applyCard.getKf());
        row.createCell(12).setCellValue(applyCard.getVouchno());
    }
    return wb;
}

1. 我这点是根据前台传过来一个值（发票号）进行数据库查询，

所以路径中有一个invoiceno，

@RequestMapping(value = "/getEXCEL", produces = "application/octet-stream")
@ResponseBody
public void downloadFile(HttpServletRequest request, HttpServletResponse response, @RequestParam(value = "invoiceno", required = true) String invoiceno)throws IOException {

    List list = new ArrayList();

    String stringlist=newFrontsService.getExcelInformation(invoiceno);

    ObjectMapper mapper = new ObjectMapper();

    JavaTypejavaType=mapper.getTypeFactory().constructParametricType(ArrayList.class, ExcelInformation.class);

    List entityList = (List) mapper.readValue(stringlist, javaType);

    list = entityList;

    HSSFWorkbook wb = this.export(list);

    OutputStream output = response.getOutputStream();

    response.addHeader("Content-Disposition", "inline;filename="

            + new SimpleDateFormat("yyyyMMdd_HHmmssSSS").format(new Date()) + ".xls");

    response.setContentType("application/msexcel");

    wb.write(output);

    output.close();

}

 

 

我的Sql

//测试

public String getExcelInformation(String invoiceno){

    String sql = "SELECT   tz.oblno,tz.vessel,tz.voy,tz.etd,tz.portload,tz.portdis,bill.itemcode,bill.moneytype,bill.money_sj,bill.invoiceno,"     +
          " mxd.jd,mxd.kf,bill.vouchno,codelib.name,userlist.name AS username FROM bill" +

            " INNER JOIN tz ON tz.ybh = bill.ybh" +

            " INNER JOIN mxd ON mxd.ybh = bill.ybh" +

            " INNER JOIN codelib ON bill.itemcode = codelib.code" +

            " INNER JOIN userlist ON userlist.userno = mxd.jd" +

            " WHERE bill.invoiceno = ? and bill.billtype = '0'";

    List> list = proxoolManager.getSybaseTemplate().queryForList(sql,invoiceno);

    return JSON.toJSONString(list.toArray());

}

 

 

实体类，工具类，控制层，sql一应俱全。

小弟不才，喜欢多听建议