webuploader分片上传的实现代码（前后端分离）

WebUploader.Uploader.register({ 
      'name': 'webUploaderHookCommand', 
      'before-send-file': 'beforeSendFile', 
      "before-send": "beforeSend" 
    }, { 
      beforeSendFile: function(file) { 
        var task = new WebUploader.Deferred(); 
        fileName = file.name; 
        fileSize = file.size; 
        (new WebUploader.Uploader()).md5File(file, 0, 10 * 1024 * 1024).progress(function(percentage) {}).then(function(val) { 
          fileMd5 = val; 
          var url = checkUrl; 
          var data = { 
            type: 0, 
            fileName: fileName, 
            fileMd5: fileMd5, 
            fileSize: fileSize 
          }; 
          $.ajax({ 
            type: "POST", 
            url: url, 
            data: data, 
            cache: false, 
            async: false, // 同步 
            timeout: 1000, // todo 超时的话，只能认为该分片未上传过 
            dataType: "json", 
            error: function(XMLHttpRequest, textStatus, errorThrown) { 
              file.statusText = 'server_error'; 
              task.reject(); 
            } 
          }).then(function(data, textStatus, jqXHR) { 
            if(data.rtn == 0) { 
              if(data.obj == 1) { 
                file.statusText = 'file_existed'; 
                task.reject(); 
              } else { 
                task.resolve(); 
              } 
            } else { 
              task.reject(); 
            } 
          }); 
        }); 
        return task.promise(); 
      }, 
      beforeSend: function(block) { 
        var task = new WebUploader.Deferred(); 
        var url = checkUrl; 
        var data = { 
          type: 1, 
          fileName: fileName, 
          fileMd5: fileMd5, 
          chunk: block.chunk, 
          fileSize: block.end - block.start 
        }; 
        $.ajax({ 
          type: "POST", 
          url: url, 
          data: data, 
          cache: false, 
          async: false, // 同步 
          timeout: 1000, // todo 超时的话，只能认为该分片未上传过 
          dataType: "json" 
        }).then(function(data, textStatus, jqXHR) { 
          if(data.rtn == 0 && data.obj == 1) { 
            task.reject(); // 分片存在，则跳过上传 
          } else { 
            task.resolve(); 
          } 
        }); 
        this.owner.options.formData.fileMd5 = fileMd5; 
        this.owner.options.formData.chunkSize = chunkSize; 
        return task.promise(); 
      } 
    }); 
 
    // 实例化 
    uploader = WebUploader.create({ 
      pick: { 
        id: '#filePicker', 
        label: '点击选择文件' 
      }, 
      formData: { 
        uid: 123 
      }, 
      dnd: '#dndArea', //指定文件拖拽的区域 
      paste: '#uploader', //指定监听paste事件的容器，如果不指定，不启用此功能。此功能为通过粘贴来添加截屏的图片。建议设置为document.body. 
      swf: '../plugins/webuploader/Uploader.swf', 
      chunked: true, 
      chunkSize: chunkSize, 
      chunkRetry: false, 
      threads: 1, 
      server: uploadUrl, 
      // runtimeOrder: 'flash', 
 
      // accept: { 
      //   title: 'Images', 
      //   extensions: 'gif,jpg,jpeg,bmp,png', 
      //   mimeTypes: 'image/*' 
      // }, 
      // 禁掉全局的拖拽功能。这样不会出现图片拖进页面的时候，把图片打开。 
      disableGlobalDnd: true, 
      fileNumLimit: 300 //限制多文件上传的个数 
      //fileSizeLimit: 200 * 1024 * 1024, // 限制所有文件的大小 200 M 
      //fileSingleSizeLimit: 50 * 1024 * 1024 // 限制单个文件的大小 50 M 
    }); 

import java.io.File; 
import java.io.IOException; 
 
import org.slf4j.Logger; 
import org.slf4j.LoggerFactory; 
import org.springframework.beans.factory.annotation.Value; 
import org.springframework.stereotype.Service; 
import org.springframework.web.multipart.MultipartFile; 
 
import com.bear.upload.util.FileUtil; 
import com.bear.upload.util.RETURN; 
import com.bear.upload.vo.CheckMd5FileVO; 
import com.bear.upload.vo.UploadVO; 
 
@Service 
public class ChunkUploadService { 
 
  private static Logger LOG = LoggerFactory.getLogger(ChunkUploadService.class); 
 
  @Value("${file.upload.path}") 
  private String UPLOAD_PATH; 
 
  private static final String Delimiter = "-"; 
 
  /** 
   * 上传之前校验(整个文件、分片) 
   * 
   * @param md5FileVO 
   * @return 
   */ 
  public Object check(CheckMd5FileVO md5FileVO) { 
    Integer type = md5FileVO.getType(); 
    Long chunk = md5FileVO.getChunk(); 
    String fileName = md5FileVO.getFileName(); 
    Long fileSize = md5FileVO.getFileSize(); 
    if (type == 0) {// 未分片校验 
      String destfilePath = UPLOAD_PATH + File.separator + fileName; 
      File destFile = new File(destfilePath); 
      if (destFile.exists() && destFile.length() == fileSize) { 
        return RETURN.success("文件已存在，跳过", 1); 
      } else { 
        return RETURN.success("文件不存在", 0); 
      } 
    } else {// 分片校验 
      String fileMd5 = md5FileVO.getFileMd5(); 
      String destFileDir = UPLOAD_PATH + File.separator + fileMd5; 
      String destFileName = chunk + Delimiter + fileName; 
      String destFilePath = destFileDir + File.separator + destFileName; 
      File destFile = new File(destFilePath); 
      if (destFile.exists() && destFile.length() == fileSize) { 
        return RETURN.success("分片已存在，跳过", 1); 
      } else { 
        return RETURN.success("分片不存在", 0); 
      } 
    } 
  } 
 
  /** 
   * 文件上传 
   * 
   * @param file 
   * @param uploadVO 
   * @param appVersion 
   * @return 
   */ 
  public Object upload(MultipartFile file, UploadVO uploadVO) { 
    Long chunk = uploadVO.getChunk(); 
    if (chunk == null) {// 没有分片 
      return UnChunkUpload(file, uploadVO); 
    } else {// 分片 
      return ChunkUpload(file, uploadVO); 
    } 
  } 
 
  /** 
   * 分片上传 
   * 
   * @param file 
   * @param uploadVO 
   * @param appVersion 
   * @return 
   */ 
  public Object ChunkUpload(MultipartFile file, UploadVO uploadVO) { 
    String fileName = uploadVO.getName(); 
    String fileMd5 = uploadVO.getFileMd5(); 
    Long chunk = uploadVO.getChunk();// 当前片 
    Long chunks = uploadVO.getChunks();// 总共多少片 
 
    // 分片目录创建 
    String chunkDirPath = UPLOAD_PATH + File.separator + fileMd5; 
    File chunkDir = new File(chunkDirPath); 
    if (!chunkDir.exists()) { 
      chunkDir.mkdirs(); 
    } 
    // 分片文件上传 
    String chunkFileName = chunk + Delimiter + fileName; 
    String chunkFilePath = chunkDir + File.separator + chunkFileName; 
    File chunkFile = new File(chunkFilePath); 
    try { 
      file.transferTo(chunkFile); 
    } catch (Exception e) { 
      LOG.error("分片上传出错", e); 
      return RETURN.fail("分片上传出错", 1); 
    } 
    // 合并分片 
    Long chunkSize = uploadVO.getChunkSize(); 
    long seek = chunkSize * chunk; 
    String destFilePath = UPLOAD_PATH + File.separator + fileName; 
    File destFile = new File(destFilePath); 
    if (chunkFile.length() > 0) { 
      try { 
        FileUtil.randomAccessFile(chunkFile, destFile, seek); 
      } catch (IOException e) { 
        LOG.error("分片{}合并失败：{}", chunkFile.getName(), e.getMessage()); 
        return RETURN.fail("分片合并失败", 1); 
      } 
    } 
    if (chunk == chunks - 1) { 
      // 删除分片文件夹 
      FileUtil.deleteDirectory(chunkDirPath); 
 
      return RETURN.success("上传成功", 1); 
    } else { 
      return RETURN.fail("上传中...", 1); 
    } 
  } 
 
  /** 
   * 未分片上传 
   * 
   * @param file 
   * @param uploadVO 
   * @param appVersion 
   * @return 
   */ 
  public Object UnChunkUpload(MultipartFile file, UploadVO uploadVO) { 
    String fileName = uploadVO.getName(); 
    // String fileMd5 = uploadVO.getFileMd5(); 
    // 文件上传 
    File destFile = new File(UPLOAD_PATH + File.separator + fileName); 
    if (file != null && !file.isEmpty()) { 
      // 上传目录 
      File fileDir = new File(UPLOAD_PATH); 
      if (!fileDir.exists()) { 
        fileDir.mkdirs(); 
      } 
      if (destFile.exists()) { 
        destFile.delete(); 
      } 
      try { 
        file.transferTo(destFile); 
        return RETURN.success("上传成功", 0); 
      } catch (Exception e) { 
        LOG.error("文件上传出错", e); 
        return RETURN.fail("文件上传出错", 0); 
      } 
    } 
    return RETURN.fail("上传失败", 0); 
  } 
}