檔案下載工具類

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package com.caiex.utils;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.io.UnsupportedEncodingException;import javax.servlet.ServletOutputStream;import javax.servlet.http.HttpServletResponse;import org.apache.commons.io.IOUtils;import org.springframework.stereotype.Component;import com.caiex.exception.DownloadException;import com.caiex.global.Constants;/** * 檔案下載工具類 *  * @author wsy * */@Componentpublic class FileOperateUtil {    /**     *      * @param response     *            響應對象 ，用於擷取輸出資料流     * @param fileName     *            檔案名稱     * @throws DownloadException     *             檔案不存在或者io異常時拋出此異常     */    public static void download(HttpServletResponse response, String fileName) throws DownloadException {        String downLoadPath = Constants.XLS_DOWNLOAD_PATH + fileName;        long fileLength = new File(downLoadPath).length();        response.setContentType("application/octet-stream");        try {            response.setHeader("Content-disposition", "attachment; filename=" + new String(fileName.getBytes("utf-8"), "ISO8859-1"));        } catch (UnsupportedEncodingException e) {        }        response.setHeader("Content-Length", String.valueOf(fileLength));        FileInputStream fis = null;        ServletOutputStream os = null;        try {            fis = new FileInputStream(downLoadPath);            os = response.getOutputStream();            IOUtils.write(IOUtils.toByteArray(fis), os);        } catch (FileNotFoundException e) {            throw new DownloadException("檔案未找到");        } catch (IOException e) {            throw new DownloadException("io異常");        } finally {            IOUtils.closeQuietly(fis);            IOUtils.closeQuietly(os);        }    }}

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檔案下載工具類