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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>
/*
* 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"
;
}
这是一个springmvc file.Transto 上传的
@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"
;
}
这是springMVC 最快的上传
*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"
;
}
测试结果:
fileName:test.rar
方法一的运行时间:14712ms
fileName:test.rar
方法二的运行时间:5ms
方法三的运行时间:4ms
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原文地址:http://www.cnblogs.com/dengheng/p/5798960.html