数据导出/下载

Posted 2020-10-04 0001

工具类:

import java.io.IOException;
import java.net.URLEncoder;

import sun.misc.BASE64Encoder;

public class FileUtils {
        /**
         * 下载文件时，针对不同浏览器，进行附件名的编码
         * 
         * @param filename
         *            下载文件名
         * @param agent
         *            客户端浏览器
         * @return 编码后的下载附件名
         * @throws IOException
         */
        public static String encodeDownloadFilename(String filename, String agent)
                throws IOException {
            if (agent.contains("Firefox")) { // 火狐浏览器
                filename = "=?UTF-8?B?"
                        + new BASE64Encoder().encode(filename.getBytes("utf-8"))
                        + "?=";
                filename = filename.replaceAll("\r\n", "");
            } else { // IE及其他浏览器
                filename = URLEncoder.encode(filename, "utf-8");
                filename = filename.replace("+"," ");
            }
            return filename;
        }
}

 

 

 

/**
     * @Description: 查询所有分区数据，使用附件形式下载
     * @return
     * @throws Exception
     *      
     */
    @Action("subareaAction_exportXls")
    public String exportXls() throws Exception {
        List<SubArea> list = subAreaService.findAll();
        //通过POI将数据写入excel文件
        HSSFWorkbook workbook = new HSSFWorkbook();  //空白的excel文件
        //创建标签页
        HSSFSheet sheet = workbook.createSheet("第一页分区数据");
        //创建行
        //创建标题行
        HSSFRow headRow = sheet.createRow(0);
        //创建单元格
        headRow.createCell(0).setCellValue("分区编号");
        headRow.createCell(1).setCellValue("关键字");
        headRow.createCell(2).setCellValue("辅助关键字");
        headRow.createCell(3).setCellValue("起始号");
        headRow.createCell(4).setCellValue("中止号");
        headRow.createCell(5).setCellValue("省市区");
        //创建数据行
        for (SubArea subArea : list) {
            HSSFRow dataRow = sheet.createRow(sheet.getLastRowNum()+1);
            dataRow.createCell(0).setCellValue(subArea.getId());
            dataRow.createCell(1).setCellValue(subArea.getKeyWords());
            dataRow.createCell(2).setCellValue(subArea.getAssistKeyWords());
            dataRow.createCell(3).setCellValue(subArea.getStartNum());
            dataRow.createCell(4).setCellValue(subArea.getEndNum());
            dataRow.createCell(5).setCellValue(subArea.getArea().getName());
        }
        //文件名的中文问题解决(导入工具类):
        String fileName = "分区数据.xls";
        HttpServletRequest request = ServletActionContext.getRequest();
        String agent = request.getHeader("User-Agent");
        fileName = FileUtils.encodeDownloadFilename(fileName, agent);
        
        //文件下载：一个流 两个头（文件MIME类型；文件打开方式（浏览器内部打开inline；附件形式下载--attachment）
        //从Servers项目下的web.xml中找xls对应的文件类型,比如搜索xls
        HttpServletResponse response = ServletActionContext.getResponse();
        response.setHeader("content-type", "application/vnd.ms-excel");
        response.setHeader("content-disposition", "attachment;fileName="+fileName);
        workbook.write(response.getOutputStream());
        return NONE;
    }