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    上傳電子書        上傳 

$("#upload").click(function () {
   var formdata = new formdata($('#uploadform')[0]);
   $.ajax({
    type: 'post',
    url: "https://****:8443/fileupload", //上傳文件的請求路徑必須是絕對路勁
     data: formdata,
     cache: false,
     processdata: false,
     contenttype: false,
      }).success(function (data) {
        console.log(data);
        alert("上傳成功"+data);
        filename=data;
      }).error(function () {
         alert("上傳失敗");
     });
    });

@postmapping(value = "/fileupload")
    @responsebody
    public string  fileupload(@requestparam(value = "file") multipartfile file, model model, httpservletrequest request) {
        if (file.isempty()) {
            system.out.println("文件為空空");
        }
            string filename = file.getoriginalfilename();  // 文件名
            system.out.println(file.getoriginalfilename());
            string suffixname = filename.substring(filename.lastindexof("."));  // 后綴名
            string filepath = "c://pdf//"; // 上傳后的路徑
            filename = uuid.randomuuid() + suffixname; // 新文件名
            file dest = new file(filepath + filename);
            system.out.println("pdf文件路徑為："+dest.getpath());
            if (!dest.getparentfile().exists()) {
                dest.getparentfile().mkdirs();
                system.out.println("上傳pdf文件+++++++++++");
                system.out.println("pdf文件路徑為："+dest.getpath());
            }
            try {
                file.transferto(dest);
            } catch (ioexception e) {
                e.printstacktrace();
            }
            string filename = "/pdf/" + filename;
          return filename;


    }