前台：
<%@ page language= "java" contentType= "text/html; charset=utf-8"
pageEncoding= "utf-8" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd" >
<html>
<head>
<meta http-equiv= "Content-Type" content= "text/html; charset=utf-8" >
<title>Insert title here</title>
</head>
<body>
<form name= "serForm" action= "/SpringMVC006/fileUpload" method= "post" enctype= "multipart/form-data" >
<h1>采用流的方式上传文件</h1>
<input type= "file" name= "file" >
<input type= "submit" value= "upload" />
</form>
<form name= "Form2" action= "/SpringMVC006/fileUpload2" method= "post" enctype= "multipart/form-data" >
<h1>采用multipart提供的file.transfer方法上传文件</h1>
<input type= "file" name= "file" >
<input type= "submit" value= "upload" />
</form>
<form name= "Form2" action= "/SpringMVC006/springUpload" method= "post" enctype= "multipart/form-data" >
<h1>使用spring mvc提供的类的方法上传文件</h1>
<input type= "file" name= "file" >
<input type= "submit" value= "upload" />
</form>
</body>
</html>
配置：
<!-- 多部分文件上传 -->
<bean id= "multipartResolver" class = "org.springframework.web.multipart.commons.CommonsMultipartResolver" >
<property name= "maxUploadSize" value= "104857600" />
<property name= "maxInMemorySize" value= "4096" />
<property name= "defaultEncoding" value= "UTF-8" ></property>
</bean>
后台：
方式一：
/*
* 通过流的方式上传文件
* @RequestParam("file") 将name=file控件得到的文件封装成CommonsMultipartFile 对象
*/
@RequestMapping ( "fileUpload" )
public String fileUpload( @RequestParam ( "file" ) CommonsMultipartFile file) throws IOException {
//用来检测程序运行时间
long startTime=System.currentTimeMillis();
System.out.println( "fileName：" +file.getOriginalFilename());
try {
//获取输出流
OutputStream os= new FileOutputStream( "E:/" + new Date().getTime()+file.getOriginalFilename());
//获取输入流 CommonsMultipartFile 中可以直接得到文件的流
InputStream is=file.getInputStream();
int temp;
//一个一个字节的读取并写入
while ((temp=is.read())!=(- 1 ))
{
os.write(temp);
}
os.flush();
os.close();
is.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
long endTime=System.currentTimeMillis();
System.out.println( "方法一的运行时间：" +String.valueOf(endTime-startTime)+ "ms" );
return "/success" ;
}
方式二：
/*
* 采用file.Transto 来保存上传的文件
*/
@RequestMapping ( "fileUpload2" )
public String fileUpload2( @RequestParam ( "file" ) CommonsMultipartFile file) throws IOException {
long startTime=System.currentTimeMillis();
System.out.println( "fileName：" +file.getOriginalFilename());
String path= "E:/" + new Date().getTime()+file.getOriginalFilename();
File newFile= new File(path);
//通过CommonsMultipartFile的方法直接写文件（注意这个时候）
file.transferTo(newFile);
long endTime=System.currentTimeMillis();
System.out.println( "方法二的运行时间：" +String.valueOf(endTime-startTime)+ "ms" );
return "/success" ;
}
方式三：
/*
*采用spring提供的上传文件的方法
*/
@RequestMapping ( "springUpload" )
public String springUpload(HttpServletRequest request) throws IllegalStateException, IOException
{
long startTime=System.currentTimeMillis();
//将当前上下文初始化给 CommonsMutipartResolver （多部分解析器）
CommonsMultipartResolver multipartResolver= new CommonsMultipartResolver(
request.getSession().getServletContext());
//检查form中是否有enctype="multipart/form-data"
if (multipartResolver.isMultipart(request))
{
//将request变成多部分request
MultipartHttpServletRequest multiRequest=(MultipartHttpServletRequest)request;
//获取multiRequest 中所有的文件名
Iterator iter=multiRequest.getFileNames();
while (iter.hasNext())
{
//一次遍历所有文件
MultipartFile file=multiRequest.getFile(iter.next().toString());
if (file!= null )
{
String path= "E:/springUpload" +file.getOriginalFilename();
//上传
file.transferTo( new File(path));
}
}
}
long endTime=System.currentTimeMillis();
System.out.println( "方法三的运行时间：" +String.valueOf(endTime-startTime)+ "ms" );
return "/success" ;
}
