/*

      * 另存为

      */

     @RequestMapping("/saveAs.do")

     public @ResponseBody

     void saveAs(String filePath, String fileName) {

         try {

             File file = new File(filePath);

             // 设置文件MIME类型

             getResponse().setContentType(getMIMEType(file));

             // 设置Content-Disposition

             getResponse().setHeader(

                     "Content-Disposition",

                     "attachment;filename="

                             + URLEncoder.encode(fileName, "UTF-8"));

             // 获取目标文件的绝对路径

             String fullFileName = getRealPath("/upload/" + filePath);

             // System.out.println(fullFileName);

             // 读取文件

             InputStream ins = new FileInputStream(fullFileName);

             // 放到缓冲流里面

             BufferedInputStream bins = new BufferedInputStream(ins);

             // 获取文件输出IO流

             // 读取目标文件，通过response将目标文件写到客户端

             OutputStream outs = getResponse().getOutputStream();

             BufferedOutputStream bouts = new BufferedOutputStream(outs);

             // 写文件

              int bytesRead = 0;

              byte[] buffer = new byte[8192];

              // 开始向网络传输文件流

              while ((bytesRead = bins.read(buffer, 0, 8192)) != -1) {

                  bouts.write(buffer, 0, bytesRead);

              }

              bouts.flush();// 这里一定要调用flush()方法

              ins.close();

              bins.close();

              outs.close();

              bouts.close();

         } catch (Exception e) {

             e.printStackTrace();

         }

     }

     /*

      * 批量下载另存为

      */

     @RequestMapping("/batDownload.do")

     public @ResponseBody

     void batDownload(String filePaths, String fileNames) {

         String tmpFileName = "work.zip";

         byte[] buffer = new byte[1024];

         String strZipPath = getRealPath("/upload/work/"+tmpFileName);

         try {

             ZipOutputStream out = new ZipOutputStream(new FileOutputStream(

                         strZipPath));

             String[] files=filePaths.split("\\|",-1);

             String[] names=fileNames.split("\\|",-1);

             // 下载的文件集合

             for (int i = 0; i < files.length; i++) {

                 FileInputStream fis = new FileInputStream(getRealPath("/upload/"+files[i]));

                 out.putNextEntry(new ZipEntry(names[i]));

                  //设置压缩文件内的字符编码，不然会变成乱码

                 out.setEncoding("GBK");

                 int len;

                 // 读入需要下载的文件的内容，打包到zip文件

                 while ((len = fis.read(buffer)) > 0) {

                     out.write(buffer, 0, len);

                 }

                 out.closeEntry();

                 fis.close();

             }

              out.close();

              saveAs("work/"+tmpFileName, tmpFileName);  

         } catch (Exception e) {

             e.printStackTrace();

         }

     }

     /**

      * 根据文件后缀名获得对应的MIME类型。

      *

      * @param file

      */

     private String getMIMEType(File file) {

         String type = "*/*";

         String fName = file.getName();

         // 获取后缀名前的分隔符"."在fName中的位置。

         int dotIndex = fName.lastIndexOf(".");

         if (dotIndex < 0) {

             return type;

         }

         /* 获取文件的后缀名 */

         String end = fName.substring(dotIndex, fName.length()).toLowerCase();

         if (end == "")

             return type;

         // 在MIME和文件类型的匹配表中找到对应的MIME类型。

         for (int i = 0; i < MIME_MapTable.length; i++) {

             if (end.equals(MIME_MapTable[i][0]))

                 type = MIME_MapTable[i][1];

         }

         return type;

     }

     private final String[][] MIME_MapTable = {

             // {后缀名， MIME类型}

             { ".doc", "application/msword" },

             { ".docx",

                     "application/vnd.openxmlformats-officedocument.wordprocessingml.document" },

             { ".xls", "application/vnd.ms-excel" },

             { ".xlsx",

                     "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" },

             { ".pdf", "application/pdf" },

             { ".ppt", "application/vnd.ms-powerpoint" },

             { ".pptx",

                     "application/vnd.openxmlformats-officedocument.presentationml.presentation" },

             { ".txt", "text/plain" }, { ".wps", "application/vnd.ms-works" },

             { "", "*/*" } };

 };

<form id="batForm" action="<%=path%>/file/batDownload.do" method="post">

        <input type="hidden" id="filePaths" name="filePaths" value=""/>

        <input type="hidden" id="fileNames" name="fileNames" value=""/>

    </form>

function download(){

        var objs=$("#fileFrame").contents().find("input[name='ckFile']:checked");

        if(objs.length>0){

            var filePaths="";

            var fileNames="";

            for(var i=0;i<objs.length;i++){

                filePaths+=$("#fileFrame").contents().find("#path_"+objs[i].value).val()+"|";

                fileNames+=$("#fileFrame").contents().find("#a_"+objs[i].value).html()+"|";

            }

            filePaths=filePaths.substring(0,filePaths.length-1);

            fileNames=fileNames.substring(0,fileNames.length-1);

            $("#filePaths").val(filePaths);

            $("#fileNames").val(fileNames);

            $("#batForm").submit();

        }else{

            alert("请选择需要下载的文件！");

            return false;

        }

    }