利用MultipartFile实现文件上传功能

利用MultipartFile实现文件上传功能

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;

impouCQFuiFBrt 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

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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