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();
    }
}


二.配置文件中如下配置:
1.web.xml,利用spring mvc模式,大家应该都很熟悉了
    
        chb
        org.springframework.web.servlet.DispatcherServlet
        1
    

    
        chb
        *.do
    
2.chb-servlet.xml,这里要配置映射,并可以设定最大可上传文件的大小



    
    
        
            action
        
        
            index
        
    

    
        
        
    


    
        
          
            fileUploadController
          
        
    

    
        
        
        
        
         
   

三.设定jsp页面
 
    
        上传文件：
        
    
    
        
    

ok,现在就可以上传文件了,挺简单吧?这里我只列出了基本步骤,至于具体的操作(比如中文问题)可能就需要大家自己再完善完善了.
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