【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;
    }