Spring Boot 利用WebUploader进行文件上传功能

(function( factory ) {
  if ( !window.jquery ) {
    alert('jquery is required.')
  }
  jquery(function() {
    factory.call( null, jquery );
  });
})
(function( $ ) {
// -----------------------------------------------------
// ------------ start ----------------------------------
// -----------------------------------------------------
// ---------------------------------
// --------- uploader -------------
// ---------------------------------
  var uploader = (function() {
    // -------setting-------
    // 如果使用原始大小，超大的图片可能会出现 croper ui 卡顿，所以这里建议先缩小后再crop.
    var frame_width = 1600;
    var _ = webuploader;
    var uploader = _.uploader;
    var uploadercontainer = $('.uploader-container');
    var uploader, file;
    if ( !uploader.support() ) {
      alert( 'web uploader 不支持您的浏览器！');
      throw new error( 'webuploader does not support the browser you are using.' );
    }
    // hook,
    // 在文件开始上传前进行裁剪。
    uploader.register({
      'before-send-file': 'cropimage'
    }, {
      cropimage: function( file ) {
        var data = file._cropdata,
          image, deferred;
        file = this.request( 'get-file', file );
        deferred = _.deferred();
        image = new _.lib.image();
        deferred.always(function() {
          image.destroy();
          image = null;
        });
        image.once( 'error', deferred.reject );
        image.once( 'load', function() {
          image.crop( data.x, data.y, data.width, data.height, data.scale );
        });
        image.once( 'complete', function() {
          var blob, size;
          // 移动端 uc / qq 浏览器的无图模式下
          // ctx.getimagedata 处理大图的时候会报 exception
          // index_size_err: dom exception 1
          try {
            blob = image.getasblob();
            size = file.size;
            file.source = blob;
            file.size = blob.size;
            file.trigger( 'resize', blob.size, size );
            deferred.resolve();
          } catch ( e ) {
            console.log( e );
            // 出错了直接继续，让其上传原始图片
            deferred.resolve();
          }
        });
        file._info && image.info( file._info );
        file._meta && image.meta( file._meta );
        image.loadfromblob( file.source );
        return deferred.promise();
      }
    });
    return {
      init: function( selectcb ) {
        uploader = new uploader({
          pick: {
            id: '#filepicker',
            multiple: false
          },
          // 设置用什么方式去生成缩略图。
          thumb: {
            quality: 70,
            // 不允许放大
            allowmagnify: false,
            // 是否采用裁剪模式。如果采用这样可以避免空白内容。
            crop: false
          },
          // 禁掉分块传输，默认是开起的。
          chunked: false,
          // 禁掉上传前压缩功能，因为会手动裁剪。
          compress: false,
          // filesinglesizelimit: 2 * 1024 * 1024,
          server: 'studentimgfileupload',
          swf: $.trim($("#base_url").val()) + '/static/webuploader/uploader.swf',
          filenumlimit: 1,
          // 只允许选择图片文件。
          accept: {
            title: 'images',
            // extensions: 'gif,jpg,jpeg,bmp,png',
            // mimetypes: 'image/*'
            extensions: 'jpg,jpeg,png',
            //解决webuploader chrome 点击上传文件选择框会延迟几秒才会显示 反应很慢
            mimetypes: 'image/jpg,image/jpeg,image/png'  //修改这行
          }
          //formdata: {"authorization": localstorage.token}, //额外参数传递，可以没有
          // chunked: true, //分片
          // chunksize: 10 * 1024 * 1024, //分片大小指定
          // threads:1, //线程数量
          // disableglobaldnd: true //禁用拖拽
          // onerror: function() {
          //   var args = [].slice.call(arguments, 0);
          //   alert(args.join('\n'));
          // }
        });
        uploader.on('filequeued', function( _file ) {
          file = _file;
          uploader.makethumb( file, function( error, src ) {
            if ( error ) {
              alert('不能预览');
              return;
            }
            selectcb( src );
          }, frame_width, 1 );  // 注意这里的 height 值是 1，被当成了 100% 使用。
        });
        /**
         * 验证文件格式以及文件大小
         */
        uploader.on("error", function (type) {
          if (type == "q_type_denied") {
            showinfo("请上传jpg、jepg、png、格式文件");
          }
        });
        // 文件上传成功，给item添加成功class, 用样式标记上传成功。
        uploader.on( 'uploadsuccess', function( file ) {
          showinfo("上传成功");
        });
        // 文件上传失败，显示上传出错。
        uploader.on( 'uploaderror', function( file ) {
          showinfo("上传失败");
        });
      },
      crop: function( data ) {
        var scale = croper.getimagesize().width / file._info.width;
        data.scale = scale;
        file._cropdata = {
          x: data.x1,
          y: data.y1,
          width: data.width,
          height: data.height,
          scale: data.scale
        };
      },
      upload: function() {
        uploader.upload();
      }
    }
  })();
// ---------------------------------
// --------- crpper ---------------
// ---------------------------------
  var croper = (function() {
    var container = $('.cropper-wraper');
    var $image = container.find('.img-container img');
    var btn = $('.upload-btn');
    var isbase64supported, callback;
    $image.cropper({
      aspectratio: 4 / 4,
      preview: ".img-preview",
      done: function(data) {
        // console.log(data);
      }
    });
    function srcwrap( src, cb ) {
      // we need to check this at the first time.
      if (typeof isbase64supported === 'undefined') {
        (function() {
          var data = new image();
          var support = true;
          data.onload = data.onerror = function() {
            if( this.width != 1 || this.height != 1 ) {
              support = false;
            }
          }
          data.src = src;
          isbase64supported = support;
        })();
      }
      if ( isbase64supported ) {
        cb( src );
      } else {
        // otherwise we need server support.
        // convert base64 to a file.
        // $.ajax('', {
        //   method: 'post',
        //   data: src,
        //   datatype:'json'
        // }).done(function( response ) {
        //   if (response.result) {
        //     cb( response.result );
        //   } else {
        //     alert("预览出错");
        //   }
        // });
      }
    }
    btn.on('click', function() {
      callback && callback($image.cropper("getdata"));
      return false;
    });
    return {
      setsource: function( src ) {
        // 处理 base64 不支持的情况。
        // 一般出现在 ie6-ie8
        srcwrap( src, function( src ) {
          $image.cropper("setimgsrc", src);
        });
        container.removeclass('webuploader-element-invisible');
        return this;
      },
      getimagesize: function() {
        var img = $image.get(0);
        return {
          width: img.naturalwidth,
          height: img.naturalheight
        }
      },
      setcallback: function( cb ) {
        callback = cb;
        return this;
      },
      disable: function() {
        $image.cropper("disable");
        return this;
      },
      enable: function() {
        $image.cropper("enable");
        return this;
      }
    }
  })();
// ------------------------------
// -----------logic--------------
// ------------------------------
  var container = $('.uploader-container');
  uploader.init(function( src ) {
    croper.setsource( src );
    // 隐藏选择按钮。
    container.addclass('webuploader-element-invisible');
    // 当用户选择上传的时候，开始上传。
    croper.setcallback(function( data ) {
      uploader.crop(data);
      uploader.upload();
    });
  });
// -----------------------------------------------------
// ------------ end ------------------------------------
// -----------------------------------------------------
});

 @requestmapping(value="/student/studentimgfileupload", method=requestmethod.post)
  @responsebody
  string studentimgfileupload(@requestparam multipartfile file, httpservletrequest request){
    logger.info("学生头像上传....")
    //获取文件名
    string originalfilename = file.getoriginalfilename()
    logger.info("上传文件名：" + originalfilename)
    string realpath = request.getservletcontext().getrealpath("/public/student/")
    string uploadfilename = system.currenttimemillis()+"_"+ originalfilename
    logger.info("获取上传路径：" + realpath + ", 上传的真实文件名：" + uploadfilename)
    boolean flag = true

    //合并文件
    randomaccessfile rafile = null
    bufferedinputstream inputstream = null
    try{
      file dirfile = new file(realpath, uploadfilename)
      //以读写的方式打开目标文件
      rafile = new randomaccessfile(dirfile, "rw")
      rafile.seek(rafile.length())
      inputstream = new bufferedinputstream(file.getinputstream())
      byte[] buf = new byte[1024]
      int length = 0
      while ((length = inputstream.read(buf)) != -1) {
        rafile.write(buf, 0, length)
      }
    }catch(exception e){
      flag = false
      logger.info("上传出错:" + e.getmessage())
      throw new ioexception(e.getmessage())
    }finally{
      try {
        if (inputstream != null) {
          inputstream.close()
        }
        if (rafile != null) {
          rafile.close()
        }
      }catch(exception e){
        flag = false
        logger.info("上传出错:" + e.getmessage())
        throw new ioexception(e.getmessage())
      }
    }
  }