多文件打包下载
一、多文件打包下载
选择多文件，后台压缩zip到服务器，下载到本地，删掉服务器文件
1.js代码
//工具栏：批量下载（zip） $('#templatedownload').bind("click", function(){ debugger; var rows = $('#templatedg').datagrid('getSelections'); var datas = JSON.stringify(rows); if (rows.length>0){ $.ajax({ url: encodeURI(ctx + '/report/template/download'), type: 'post', cache: false, contentType: "application/json", dataType: "json", data:datas, success: function (result) { debugger; var filePath = result.filePath; templateFileDownload( filePath); }, error: function (e) { showMsg(result, 'error'); } }); }else { msgAlert('请选择一笔记录！','info'); } }); //下载请求 function templateFileDownload( filePath){ var downloadForm=$("<form>");//定义一个form表单 downloadForm.attr("style","display:none"); downloadForm.attr("target",""); downloadForm.attr("method","post"); downloadForm.attr("action",ctx + "/report/template/downloadFile"); var filePath_inp=$("<input>"); filePath_inp.attr("type","hidden"); filePath_inp.attr("name","filePath"); filePath_inp.attr("value",filePath); $("body").append(downloadForm);//将表单放置在web中 downloadForm.append(filePath_inp); downloadForm.submit();//表单提交 }
2.controller
/** * 下载批量 */ @ResponseBody @RequestMapping(value = "/download" ,method = RequestMethod.POST ) public R download(@RequestBody List<ReptTemplateVO> rows,HttpServletRequest request, HttpServletResponse response) { String filePath = ""; try { filePath = ZipDownload.downloadFiles(rows, request, response); } catch (Exception e) { return R.error().put("message", e.getMessage()); } return R.ok().put("filePath", filePath); } /** * 下载批量 */ @ResponseBody @RequestMapping(value = "/downloadFile" ,method = RequestMethod.POST ) public void downloadFile(@RequestParam Map<String, Object> params, HttpServletResponse response) throws Exception { String filePath = params.get("filePath").toString(); filePath = new String(filePath.getBytes("ISO-8859-1"), "UTF-8"); filePath = URLDecoder.decode(filePath, "UTF-8"); File file = new File(filePath); ZipDownload.downloadZip(file, response); }
3.util
package com.itouzi.tam.report.example; import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import java.util.ArrayList; import java.util.List; import java.util.zip.ZipEntry; import java.util.zip.ZipOutputStream; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.itouzi.tam.report.vo.ReptTemplateVO; public class ZipDownload { public static String downloadFiles(List<ReptTemplateVO> templates,HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("UTF-8"); String realPath = request.getSession().getServletContext().getRealPath("/WEB-INF/jasper"); List<File> files = new ArrayList<File>(); int index = 0; long fileLength = 0; for(ReptTemplateVO temp : templates) { String code = temp.getTplCode(); String filePath = realPath+"//"+code+".json"; File file = new File(filePath); files.add(file); fileLength += file.length(); index++; String filePath1 = realPath+"//"+code+".jasper"; File file1 = new File(filePath1); files.add(file1); fileLength += file1.length(); index++; } String fileName = System.currentTimeMillis()+".zip"; //在服务器端创建打包下载的临时文件 String outFilePath = realPath+"//" + fileName; File file = new File(outFilePath); //文件输出流 FileOutputStream outStream = new FileOutputStream(file); //压缩流 ZipOutputStream toClient = new ZipOutputStream(outStream); try { zipFile(files, toClient); } catch (IOException e) { toClient.close(); outStream.close(); file.delete(); //将生成的服务器端文件删除 throw new IOException("文件下载失败！"); } catch (ServletException e) { toClient.close(); outStream.close(); file.delete(); //将生成的服务器端文件删除 throw new ServletException("下载文件不存在！"); } toClient.close(); outStream.close(); return outFilePath; // downloadZip(file, response); } /** * 压缩文件列表中的文件 * @param files * @param outputStream * @throws IOException */ public static void zipFile(List files, ZipOutputStream outputStream) throws IOException,ServletException { try { int size = files.size(); //压缩列表中的文件 for(int i = 0; i < size; i++) { File file = (File) files.get(i); zipFile(file, outputStream); } } catch(IOException e) { throw e; } } /** * 将文件写入到zip文件中 * @param inputFile * @param outputstream * @throws Exception */ public static void zipFile(File inputFile, ZipOutputStream outputstream) throws IOException,ServletException { try{ if(inputFile.exists()) { if(inputFile.isFile()) { FileInputStream inStream = new FileInputStream(inputFile); BufferedInputStream bInStream = new BufferedInputStream(inStream); ZipEntry entry = new ZipEntry(inputFile.getName()); outputstream.putNextEntry(entry); final int MAX_BYTE = 10 * 1024 *1024; //最大的流为10M long streamTotal = 0; //接受流的容量 int streamNum = 0; //流需要分开的数量 int leaveByte = 0; //文件剩下的字符数 byte[] inOutbyte; //byte数组接受文件的数据 streamTotal = bInStream.available(); //通过available方法取得流的最大字符数 streamNum = (int)Math.floor(streamTotal / MAX_BYTE); //取得流文件需要分开的数量 leaveByte = (int)streamTotal % MAX_BYTE; //分开文件之后,剩余的数量 if (streamNum > 0) { for(int j = 0; j < streamNum; ++j) { inOutbyte = new byte[MAX_BYTE]; //读入流,保存在byte数组 bInStream.read(inOutbyte, 0, MAX_BYTE); outputstream.write(inOutbyte, 0, MAX_BYTE); //写出流 } } //写出剩下的流数据 inOutbyte = new byte[leaveByte]; bInStream.read(inOutbyte, 0, leaveByte); outputstream.write(inOutbyte); outputstream.closeEntry(); //Closes the current ZIP entry and positions the stream for writing the next entry bInStream.close(); //关闭 inStream.close(); } } else { // inputFile.delete(); throw new ServletException("文件不存在！"); } } catch(IOException e) { throw e; } } /** * 下载打包的文件 * @param file * @param response */ public static void downloadZip(File file,HttpServletResponse response) { try { // 以流的形式下载文件。 BufferedInputStream fis = new BufferedInputStream(new FileInputStream(file.getPath())); byte[] buffer = new byte[fis.available()]; fis.read(buffer); fis.close(); // 清空response response.reset(); OutputStream toClient = new BufferedOutputStream(response.getOutputStream()); response.setContentType("application/octet-stream"); response.setHeader("Content-Disposition", "attachment;filename=" + file.getName()); toClient.write(buffer); toClient.flush(); toClient.close(); file.delete(); //将生成的服务器端文件删除 } catch (IOException ex) { ex.printStackTrace(); } } }
