从服务器下载文件
文件以字节数组存在数据库中，下载的时候从服务器端下载到本地：
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@RequestMapping("/xxx.action")public ModelAndView doDownLoadAttachment(HttpServletRequest request,HttpServletResponse response) {ModelAndView mav = new ModelAndView("ajaxText");String fileName = request.getParameter("fileName");String riskId = request.getParameter("riskId");String arkUser=request.getParameter("arkUser");byte[] fileAttachment = riskRelationDao.getOne(riskId,Constants4BizType.RELATION_FILE_ATTACHMENT_BUNINESS_TPYE,fileName).getAttachment();// String absFileName=System.getProperty("user.home")+"\"+fileName;if(fileAttachment==null){mav.addObject("responseText","文件中含有特殊字符，获取文件失败！请删除后重新上传");return mav;}boolean retBoolean = DownLoadUtil.downloadFile(fileAttachment,response, fileName, arkUser);if (!retBoolean) {mav.addObject("responseText", "文件流读取异常，下载失败！");}return mav;}?其中，ajaxText.vm 在web-inf下面的velocity或者views目录下面，如果文件目录嵌入更深，比如子在web-inf/velocity/item/ajaxText.vm?目录下面，则是：
ModelAndView mav = new ModelAndView("item/casedetails");
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public class DownLoadUtil {public static boolean downloadFile(byte[] fileAttachment,HttpServletResponse response, String fileName, String arkUser) {response.reset();/* * String fileType=fileName.substring(fileName.lastIndexOf(".")); * if((".pdf").equals(fileType)){ * response.setContentType("application/pdf;charset=GBK"); }else * if((".xls").equals(fileType)||(".xlsx").equals(fileType)){ * response.setContentType("application/vnd.ms-excel;charset=GBK"); * }else if((".doc").equals(fileType)||("docx").equals(fileType)){ * response.setContentType("application/msword;charset=GBK"); }else * if((".jpg").equals(fileType)||("jpeg").equals(fileType)){ * response.setContentType("image/jpeg"); }else * if(".gif".equals(fileType)){ response.setContentType("image/gif"); * }else if(".png".equals(fileType)){ // image/png * response.setContentType("application/x-png"); }else * if(".bmp".equals(fileType)){ * response.setContentType("application/x-bmp"); } */// "x-msdownload"不区分文件格式，统一下载为文件格式，具体的打开编辑器windows会根据文件后缀进行选择,charset='UTF-8'可选项response.setContentType("application/x-msdownload;charset='UTF-8'");// response.setCharacterEncoding("gbk");try {// html页面不能把utf解析出的"+"号进行转码，也就是不识别+号，所以要进行转码response.setHeader("Content-Disposition","attachment;filename="+ URLEncoder.encode(("riskm_" + arkUser + "_" + fileName),"UTF-8").replaceAll("\\+", "%20"));} catch (Exception e) {e.printStackTrace();}OutputStream out = null;try {out = response.getOutputStream();out.write(fileAttachment);out.flush();response.flushBuffer();} catch (IOException e) {response.reset();e.printStackTrace();return false;} finally {if (out != null) {try {out.close();} catch (IOException e) {e.printStackTrace();}}}return true;}?
下载页面嵌入一个下载的js组件Downloadr，
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<td colspan="3" style="padding: 8px"> #foreach($fileName in $fileAttachmentsName) <span style="color: green;">$!{fileName} #if("$!{fileName}"!="") <a href="/xxx.action?fileName=$!{fileName}&riskId=$!{riskId}&arkUser=$!{arkUser}" rel="downloadr" title="Downloadr">下载</a> #end </span> <br><br> #end </td>?
组件所在的文件夹放在工程的src/main/webapp/source/js 文件夹下，需要具体的组件和邮件给我哦~
<link href="../source/css/download/facebox.css" media="screen" rel="stylesheet" type="text/css"/> <script src="../source/js/download/facebox.js" type="text/javascript"></script> <link href="../source/css/download/downloadr.css" media="screen" rel="stylesheet" type="text/css"/> <script src="../source/js/download/jqbrowser.js" type="text/javascript"></script> <script src="../source/js/download/downloadr.js" type="text/javascript"></script><script type="text/javascript"> $(document).ready(function () { $('a[rel*=downloadr]').downloadr();}); </script>??
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