这时:commonsmultipartresolver 的源码,可以研究一下 http://www.verysource.com/code/2337329_1/commonsmultipartresolver.java.html
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:
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<!-- 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:
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/* * 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:
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/* * 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:
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/* *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" ;
}
|