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:
1
2
3
4
5
6
|
<!-- 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
|
/* * 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
|
/* * 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
|
/* *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" ; } |