利用MultipartFile实现文件上传

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本文介绍如何使用Spring框架中的MultipartFile类实现文件上传功能。通过创建FileUploadBean和FileUploadController两个类，演示了从接收文件到保存文件的具体步骤。

利用MultipartFile实现文件上传

分类： spring 2007-01-30 17:38 8593人阅读评论(0) 收藏举报

 
  import
  bean
  exception
  servlet
  class
  file 
 

利用MultipartFile实现文件上传

在java中上传文件似乎总有点麻烦,没.net那么简单,记得最开始的时候用smartUpload实现文件上传,最近在工作中使用spring的MultipartFile实现文件上传,感觉挺简单,在这里和大家分享一下.

一.主要有两个java类,和一般的servlet放在一起即可.

1.FileUploadBean.java

package chb.demo.web;

import org.springframework.web.multipart.MultipartFile;

/**
* @author chb
*
*/
public class FileUploadBean {

    private MultipartFile file;

    public void setFile(MultipartFile file) {
        this.file = file;
    }

    public MultipartFile getFile() {
        return file;
    }
}

2.FileUploadController.java

package chb.demo.web;

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

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.validation.BindException;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.SimpleFormController;

/**
* @author chb
*
*/
public class FileUploadController extends SimpleFormController {

    protected ModelAndView onSubmit(
        HttpServletRequest request,
        HttpServletResponse response,
        Object command,
        BindException errors){

        try
        {
            // cast the bean
            FileUploadBean bean = (FileUploadBean) command;

            // let's see if there's content there
            MultipartFile file = bean.getFile();

            if (file == null) {
                throw new Exception("上传失败：文件为�空");
            }
            if(file.getSize()>10000000)
            {
                throw new Exception("上传失败：文件大小不能超过10M");
            }
            //得到文件�名
            String filename=file.getOriginalFilename();

            if(file.getSize()>0){
                try {
                    SaveFileFromInputStream(file.getInputStream(),"D:/",filename);
                } catch (IOException e) {
                    System.out.println(e.getMessage());
                    return null;
                }
            }
            else{
                throw new Exception("上传失败：上传文件不能为�空");
            }
            // well, let's do nothing with the bean for now and return:
            try {
                return super.onSubmit(request, response, command, errors);

            } catch (Exception e) {
                System.out.println(e.getMessage());
                return null;
            }
        }
        catch(Exception ex)
        {
            System.out.println(ex.getMessage());
            return null;
        }
    }

    /**保存文件
     * @param stream
     * @param path
     * @param filename
     * @throws IOException
     */
    public void SaveFileFromInputStream(InputStream stream,String path,String filename) throws IOException
    {
        FileOutputStream fs=new FileOutputStream( path + "/"+ filename);
        byte[] buffer =new byte[1024*1024];
        int bytesum = 0;
        int byteread = 0;
        while ((byteread=stream.read(buffer))!=-1)
        {
           bytesum+=byteread;
           fs.write(buffer,0,byteread);
           fs.flush();
        }
        fs.close();
        stream.close();
    }
}