zoukankan      html  css  js  c++  java
  • java-下载excel

    在java程序里面处理excel,我觉得比较方便的方式是先做出一个excel的模板(比如定义表头信息、表格名称等),然后根据这个模板往里面填充数据

    我这里演示的是使用poi处理2007以上版本的excel表格

    代码:

    String contextPath = session.getServletContext().getRealPath("/excel"); //获取模板路径
    XSSFWorkbook workbook = new XSSFWorkbook(new FileInputStream(contextPath + "/schedule.xlsx")); //获取模板,并装成对应类
    XSSFSheet sheet = workbook.getSheetAt(0); //获取第一张表格
    int beginRow = 2;
    int endRow = 2 + doctorVOs.size();
    for(int i = 0;beginRow < endRow; beginRow++,i++){ DoctorCountVO vo = doctorVOs.get(i); XSSFRow row = sheet.getRow(beginRow); if(row == null){ row = sheet.createRow(beginRow); XSSFCell firstCell = row.createCell(0); firstCell.setCellValue(vo.getDoctorName()); XSSFCell secondCell = row.createCell(1); secondCell.setCellValue(vo.getOutCallFullDay()); XSSFCell thirdCell = row.createCell(2); thirdCell.setCellValue(vo.getOutCallHalfDay()); XSSFCell forthCell = row.createCell(3); forthCell.setCellValue(vo.getAccompanyFullDay()); XSSFCell fifthCell = row.createCell(4); fifthCell.setCellValue(vo.getAccompanyHalfDay()); } } ByteArrayOutputStream os = new ByteArrayOutputStream(); workbook.write(os); workbook.close(); return os.toByteArray();

    方法最后会放回byte[]数组,controller层通过response放回给客户端

    byte[] bytes = scheduleService.userCountExport(contextPath, doctorVOs);
                if(bytes != null){
                    response.setContentType("application/x-msdownload");
                    response.setHeader("Content-Disposition", "attachment;filename=schedule.xlsx");
                    response.setContentLength(bytes.length);
                    response.getOutputStream().write(bytes);
                    response.getOutputStream().flush();
                    response.getOutputStream().close();
                }
  • 相关阅读:
    如何很“礼貌”的避免抛出空指针异常
    如何优雅的使用第三方插件写实体类
    IntelliJ IDEA(2019.03)破解教程(亲测实用)
    vue.js 中使用(...)运算符报错的解决方法
    44个Java性能优化
    Spring MVC原理及配置
    Intellij IDEA 从入门到上瘾 图文教程
    JVM系列二 GC策略&内存申请、对象衰老
    Spring MVC国际化配置
    Java性能优化的50个细节(珍藏版)
  • 原文地址:https://www.cnblogs.com/coderhuang/p/5178147.html
Copyright © 2011-2022 走看看