【Java】使用CSVUtils生成文件并供下载

 package com.msk.ds.logic;

 import java.io.*;
 import java.util.List;

 /**
  * Created by Administrator on 2016/5/4.
  */
 public class CSVUtils {

     public static File createCSVFile(List<Object> head, List<List<Object>> dataList, String outPutPath, String filename) {
         File csvFile = null;
         BufferedWriter csvWtriter = null;
         try {
             csvFile = new File(outPutPath + File.separator + filename + ".csv");
             File parent = csvFile.getParentFile();
             if (parent != null && !parent.exists()) {
                 parent.mkdirs();
             }
             csvFile.createNewFile();

             // GB2312使正确读取分隔符","
             csvWtriter = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(
                     csvFile), "UTF-8"), 1024);
             // 写入文件头部
             writeRow(head, csvWtriter);

             // 写入文件内容
             for (List<Object> row : dataList) {
                 writeRow(row, csvWtriter);
             }
             csvWtriter.flush();
         } catch (Exception e) {
             e.printStackTrace();
         } finally {
             try {
                 csvWtriter.close();
             } catch (IOException e) {
                 e.printStackTrace();
             }
         }
         return csvFile;
     }

     /**
      * 写一行数据方法
      *
      * @param row
      * @param csvWriter
      * @throws IOException
      */
     private static void writeRow(List<Object> row, BufferedWriter csvWriter) throws IOException {
         // 写入文件头部
         for (Object data : row) {
             StringBuffer sb = new StringBuffer();
             String rowStr = sb.append("\"").append(data).append("\",").toString();
             csvWriter.write(rowStr);
         }
         csvWriter.newLine();
     }
 }

 /**
      * 导出CSV数据
      * @return 数据
      */
     @RequestMapping(value = "dataExport",method = RequestMethod.POST)
     public @ResponseBody int dataExport(HttpServletResponse response) throws IOException{
         List<DsPrintTask> list=sc182211Logic.findDataExport();
         // 设置表格头
         Object[] head = {"任务编码", "操作码", "阅读码", "品牌名", "等级名"};
         List<Object> headList = Arrays.asList(head);
         // 设置数据
         List<List<Object>> dataList = new ArrayList<List<Object>>();
         List<Object> rowList = null;
         for (int i = 0; i < list.size(); i++) {
             rowList = new ArrayList<Object>();
             rowList.add(list.get(i).getPrintTaskId());
             rowList.add(list.get(i).getOperateBar());
             rowList.add(list.get(i).getReadBar());
             rowList.add(list.get(i).getBrandName());
             rowList.add(list.get(i).getGradeName());
             dataList.add(rowList);
         }
         String downloadFilePath ="D:/test";
         String fileName = "标签列表";
         // 导出CSV文件
         CSVUtils.createCSVFile(headList, dataList, downloadFilePath, fileName);

         response.setHeader("Content-Disposition", "attachment;filename="
                     + "liq.csv");
         response.setContentType("application/csv;charset=GBK");

         File file = new File("D:/test/标签列表.csv");
         InputStream in = new FileInputStream(file);
             int len = 0;
             byte bytes[] = new byte[1024 * 8];
             while ((len = in.read(bytes)) != -1) {
                 response.getOutputStream().write(bytes, 0, len);
             }
             in.close();// 关闭流 ....

         return NumberConst.IntDef.INT_ONE;
     }