1.在action中定义变量
1 2 3 4 5 6 | private List<String> downLoadPaths = new ArrayList<String>();//存储选中文件的下载地址 private OutputStream res; private ZipOutputStream zos; private String outPath; private String lessionIdStr;// 选中文件ID拼接的字符串 private String fileName; //浏览器下载弹出框中显示的文件名 |
分别给出get和set方法
2. 主方法
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 | /** * 下载多个文件：压缩成zip * * @return * @throws Exception */ public String downLoadLessionsZip() { downLoadPaths.clear(); String firstFileName = "";// 第一个文件的文件名 List<DownLoadFileVo> fileVos = new LinkedList<DownLoadFileVo>(); if (StringUtils.isNotEmpty(lessionIdStr)) { int end = lessionIdStr.lastIndexOf(","); if (end > 0) { if (end == lessionIdStr.length() - 1) { lessionIdStr = lessionIdStr.substring(0, end); } String[] ids = lessionIdStr.split(","); for (int i = 0; i < ids.length; i++) { if (StringUtils.isNumeric(ids[i])) { BkPersonLession lession = bkPersonLessionService.downLoadLession(Integer.parseInt(ids[i])); if (lession != null) { fileVos.add(new DownLoadFileVo(lession .getLessionName(), getContextRealPath() + lession.getLessionSavePath())); downLoadPaths.add(getContextRealPath() + lession.getLessionSavePath()); } if (i == 0) { firstFileName = lession.getLessionName(); } } } } } // 有数据可以下载 if (downLoadPaths.size() != 0) { // 进行预处理 preProcess(firstFileName); } else { // 没有文件可以下载，返回nodata return "nodata"; } // 处理 writeZip(fileVos); // 后处理关闭流 afterProcess(); return null; } // 压缩处理 public void writeZip(List<DownLoadFileVo> fileVos) { byte[] buf = new byte[8192]; int len; for (DownLoadFileVo fileVo : fileVos) { File file = new File(fileVo.getFileSavePath()); if (!file.isFile()) continue; ZipEntry ze = new ZipEntry(fileVo.getFileName() + fileVo.getFileSavePath().substring( fileVo.getFileSavePath().lastIndexOf("."))); try { zos.putNextEntry(ze); BufferedInputStream bis = new BufferedInputStream( new FileInputStream(file)); while ((len = bis.read(buf)) > 0) { zos.write(buf, 0, len); } bis.close(); zos.closeEntry(); } catch (IOException e) { e.printStackTrace(); } } } // 预处理 public void preProcess(String firseFileName) { String zipName = "【批量下载】" + firseFileName + "等.zip"; String filename = ""; try { filename = new String(zipName.getBytes("GBK"), "8859_1"); } catch (UnsupportedEncodingException e1) { e1.printStackTrace(); } this.fileName = filename; HttpServletResponse response = ServletActionContext.getResponse(); try { res = response.getOutputStream(); // 清空输出流(在迅雷下载不会出现一长窜) response.reset(); // 设定输出文件头 response.setHeader("Content-Disposition", "attachment;fileName=" + filename); response.setContentType("application/zip"); zos = new ZipOutputStream(res); } catch (IOException e) { e.printStackTrace(); } } // 后处理 public void afterProcess() { try { if (zos != null) { zos.close(); } if (res != null) { res.close(); } } catch (IOException e) { e.printStackTrace(); } } |
3. 在struts.xml中配置
1 2 3 4 5 6 | <action name="downLoadBkPersonLessionsZip" class="bkPersonLessionAction" method="downLoadLessionsZip">//class值为bean.xml中配置的bean <result name="nodata" type="httpheader"> <param name="status">204</param>//表示响应执行成功，但没有数据返回，浏览器不用刷新，不用导向新页面 </result> </action> |
DEMO下载地址：https://dwz.cn/Jw3z6fVq