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  @Autowired
  private PluploadService pluploadService;

  /**Plupload文件上传处理方法*/
  @RequestMapping(value="/pluploadUpload")
  public void upload(Plupload plupload,HttpServletRequest request,HttpServletResponse response) {

    String FileDir = "pluploadDir";//文件保存的文件夹
    plupload.setRequest(request);//手动传入Plupload对象HttpServletRequest属性

    int userId = ((User)request.getSession().getAttribute("user")).getUserId();

    //文件存储绝对路径,会是一个文件夹，项目相应Servlet容器下的"pluploadDir"文件夹，还会以用户唯一id作划分
    File dir = new File(request.getSession().getServletContext().getRealPath("/") + FileDir+"/"+userId);
    if(!dir.exists()){
      dir.mkdirs();//可创建多级目录，而mkdir()只能创建一级目录
    }
    //开始上传文件
    pluploadService.upload(plupload, dir);
  }

package web.plupload;

import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;

/**
 * Plupload实体类固定格式，属性名不可修改
 * 因为MultipartFile要用到Spring web的依赖，而该依赖在web模块中才引入，所以不把该实体类放在entity模块
 */
public class Plupload {
  /**文件原名*/
  private String name;
  /**用户上传资料被分解总块数*/
  private int chunks = -1;
  /**当前块数（从0开始计数）*/
  private int chunk = -1;
  /**HttpServletRequest对象，不会自动赋值，需要手动传入*/
  private HttpServletRequest request;
  /**保存文件上传信息，不会自动赋值，需要手动传入*/
  private MultipartFile multipartFile;

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public int getChunks() {
    return chunks;
  }

  public void setChunks(int chunks) {
    this.chunks = chunks;
  }

  public int getChunk() {
    return chunk;
  }

  public void setChunk(int chunk) {
    this.chunk = chunk;
  }

  public HttpServletRequest getRequest() {
    return request;
  }

  public void setRequest(HttpServletRequest request) {
    this.request = request;
  }

  public MultipartFile getMultipartFile() {
    return multipartFile;
  }

  public void setMultipartFile(MultipartFile multipartFile) {
    this.multipartFile = multipartFile;
  }
}

package web.plupload;

import entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.util.MultiValueMap;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;

import java.io.*;
import java.sql.Timestamp;
import java.util.Iterator;
import java.util.List;

import service.youandmeService;

/**
 * Plupload Service模块，同Plupload实体类一样，因为要用到Spring web相关依赖，所以不将其放在Service模块
 */
@Component  //将写好的类注入SpringIOC容器中让Controller自动装载
public class PluploadService {

  @Autowired
  private youandmeService youandmeService;

  public void upload(Plupload plupload,File pluploadDir){
    String fileName = ""+System.currentTimeMillis()+plupload.getName();//在服务器内生成唯一文件名
    upload(plupload, pluploadDir, fileName);
  }

  private void upload(Plupload plupload,File pluploadDir,String fileName){

    int chunks = plupload.getChunks();//用户上传文件被分隔的总块数
    int nowChunk = plupload.getChunk();//当前块，从0开始

    //这里Request请求类型的强制转换可能出错，配置文件中向SpringIOC容器引入multipartResolver对象即可。
    MultipartHttpServletRequest multipartHttpServletRequest = (MultipartHttpServletRequest)plupload.getRequest();
    //调试发现map中只有一个键值对
    MultiValueMap map = multipartHttpServletRequest.getMultiFileMap();

    if(map!=null){
      try{
        Iterator iterator = map.keySet().iterator();
        while(iterator.hasNext()){

          String key = iterator.next();
          List multipartFileList = map.get(key);

          for(MultipartFile multipartFile:multipartFileList){//循环只进行一次

            plupload.setMultipartFile(multipartFile);//手动向Plupload对象传入MultipartFile属性值
            File targetFile = new File(pluploadDir+"/"+fileName);//新建目标文件，只有被流写入时才会真正存在
            if(chunks>1){//用户上传资料总块数大于1，要进行合并

              File tempFile = new File(pluploadDir.getPath()+"/"+multipartFile.getName());
              //第一块直接从头写入，不用从末端写入
              savePluploadFile(multipartFile.getInputStream(),tempFile,nowChunk==0?false:true);

              if(chunks-nowChunk==1){//全部块已经上传完毕，此时targetFile因为有被流写入而存在，要改文件名字
                tempFile.renameTo(targetFile);

                //每当文件上传完毕，将上传信息插入数据库
                Timestamp now = new Timestamp(System.currentTimeMillis());
                youandmeService.uploadInfo(fileName,((User)(plupload.getRequest().getSession().getAttribute("user"))).getUsername(),now);
              }
            }
            else{
              //只有一块，就直接拷贝文件内容
              multipartFile.transferTo(targetFile);

              //每当文件上传完毕，将上传信息插入数据库
              Timestamp now = new Timestamp(System.currentTimeMillis());
              youandmeService.uploadInfo(fileName, ((User) (plupload.getRequest().getSession().getAttribute("user"))).getUsername(), now);
            }
          }
        }
      }
      catch (IOException e){
        e.printStackTrace();
      }
    }
  }
  private void savePluploadFile(InputStream inputStream,File tempFile,boolean flag){
    OutputStream outputStream = null;
    try {
      if(flag==false){
        //从头写入
        outputStream = new BufferedOutputStream(new FileOutputStream(tempFile));
      }
      else{
        //从末端写入
        outputStream = new BufferedOutputStream(new FileOutputStream(tempFile,true));
      }
      byte[] bytes = new byte[1024];
      int len = 0;
      while ((len = (inputStream.read(bytes)))>0){
        outputStream.write(bytes,0,len);
      }
    }
    catch (FileNotFoundException e){
      e.printStackTrace();
    }
    catch (IOException e){
      e.printStackTrace();
    }
    finally {
      try{
        outputStream.close();
        inputStream.close();
      }
      catch (IOException e){
        e.printStackTrace();
      }
    }
  }
}

    
    
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