SpringMVC上传文件的三种实现方式,直接上代码吧,大伙一看便知
前台:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
<%@ 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:
1
2
3
4
5
6
7
8
9
10
11
|
<!-- 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:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
/*
* 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:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
|
/*
* 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:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
/*
*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" ;
}
|
我们看看测试上传的时间:
第一次我用一个4M的文件:
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
第二次:我用一个50M的文件
方式一进度很慢,估计得要个5分钟
方法二的运行时间:67ms
方法三的运行时间:80ms
从测试结果我们可以看到:用springMVC自带的上传文件的方法要快的多!
对于测试二的结果:可能是方法三得挨个搜索,所以要慢点。不过一般情况下我们是方法三,因为他能提供给我们更多的方法
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:http://www.cnblogs.com/fjsnail/p/3491033.html