文件上传流式处理commons-fileupload

1. 从请求中获取MultipartFile 

    @RequestMapping(value="/upload", method=RequestMethod.POST)
    public @ResponseBody String handleFileUpload( 
            @RequestParam("file") MultipartFile file
            ) throws IOException{

2. 文件流处理

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import org.apache.commons.fileupload.util.Streams;
import org.apache.commons.io.IOUtils;
import org.springframework.web.multipart.MultipartFile;

public class UploadFileUtil {
    /**
     * 使用相同的名称
     * @param file
     * @param filePath
     * @return
     */
    public static String handleFileUpload(MultipartFile file,String filePath){
        try {
            if(!file.isEmpty()){
                String name=file.getOriginalFilename();
                InputStream inpustream=file.getInputStream();
                FileOutputStream fos = new FileOutputStream(filePath+File.separator+name);
                Streams.copy(inpustream, fos, true);    
            }else{
                return "can not upload this file,because it is empty!";
            }
        } catch (IOException e) {
            return "failed to upload this file,because Stream interrupt unexpectedly";
        }
        return "upload file sucess";
    }
    
    /**
     * 重命名文件，包含后缀
     * @param file
     * @param filePath
     * @param fileName
     * @return
     */
    public static String handleFileUpload(MultipartFile file,String filePath,String fileName){
        try {
            if(!file.isEmpty()){
                InputStream inpustream=file.getInputStream();
                FileOutputStream fos = new FileOutputStream(filePath+File.separator+fileName);
                Streams.copy(inpustream, fos, true);    
            }else{
                return "can not upload this file,because it is empty!";
            }
        } catch (IOException e) {
            return "failed to upload this file,because Stream interrupt unexpectedly";
        }
        return "upload file sucess";
    }
    
    /**
     *Copy bytes from a large (over 2GB) file with same filename
     * @param file
     * @param filePath
     * @param fileName
     * @return
     */
    
    public static String handleLargeFileUpload(MultipartFile file,String filePath){
        try {
            if(!file.isEmpty()){
                String name=file.getOriginalFilename();
                InputStream inpustream=file.getInputStream();
                FileOutputStream fos = new FileOutputStream(filePath+File.separator+name);
                IOUtils.copyLarge(inpustream, fos);    
                if(inpustream!=null){
                    inpustream.close();
                }
                if(fos!=null){
                    fos.close();
                }
            }else{
                return "can not upload this file,because it is empty!";
            }
        } catch (IOException e) {
            return "failed to upload this file,because Stream interrupt unexpectedly";
        }
        return "upload file sucess";
    }
    
    /**
     *Copy bytes from a large (over 2GB) file with rename file
     * @param file
     * @param filePath
     * @param fileName
     * @return
     */
    
    public static String handleLargeFileUpload(MultipartFile file,String filePath,String fileName){
        try {
            if(!file.isEmpty()){
                InputStream inpustream=file.getInputStream();
                FileOutputStream fos = new FileOutputStream(filePath+File.separator+fileName);
                IOUtils.copyLarge(inpustream, fos);    
                if(inpustream!=null){
                    inpustream.close();
                }
                if(fos!=null){
                    fos.close();
                }
            }else{
                return "can not upload this file,because it is empty!";
            }
        } catch (IOException e) {
            return "failed to upload this file,because Stream interrupt unexpectedly";
        }
        return "upload file sucess";
    }

}