本篇文章,我们要来做一个Spring的文件上传功能:
1. 创建一个Maven的web工程,然后配置pom.xml文件,增加依赖:
1
2
3
4
5
6
7
8
9
|
< dependency > < groupId >org.springframework.boot</ groupId > < artifactId >spring-boot-starter-web</ artifactId > < version >1.0.2.RELEASE</ version > </ dependency > |
2.在webapp目录下的index.jsp文件中输入一个表单:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
|
< html > < body > < form method = "POST" enctype = "multipart/form-data" action = "/upload" > File to upload: < input type = "file" name = "file" >< br /> Name: < input type = "text" name = "name" >< br /> < br /> < input type = "submit" value = "Upload" > Press here to upload the file! </ form > </ body > </ html > |
这个表单就是我们模拟的上传页面。
3. 编写处理这个表单的Controller:
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
72
73
74
75
76
77
|
import java.io.BufferedOutputStream; import java.io.File; import java.io.FileOutputStream; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.multipart.MultipartFile; @Controller public class FileUploadController { @RequestMapping (value= "/upload" , method=RequestMethod.GET) public @ResponseBody String provideUploadInfo() { return "You can upload a file by posting to this same URL." ; } @RequestMapping (value= "/upload" , method=RequestMethod.POST) public @ResponseBody String handleFileUpload( @RequestParam ( "name" ) String name, @RequestParam ( "file" ) MultipartFile file){ if (!file.isEmpty()) { try { byte [] bytes = file.getBytes(); BufferedOutputStream stream = new BufferedOutputStream( new FileOutputStream( new File(name + "-uploaded" ))); stream.write(bytes); stream.close(); return "You successfully uploaded " + name + " into " + name + "-uploaded !" ; } catch (Exception e) { return "You failed to upload " + name + " => " + e.getMessage(); } } else { return "You failed to upload " + name + " because the file was empty." ; } } } |
4. 然后我们对上传的文件做一些限制,同时编写main方法来启动这个web :
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
|
import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.EnableAutoConfiguration; import org.springframework.boot.context.embedded.MultiPartConfigFactory; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.ComponentScan; import org.springframework.context.annotation.Configuration; import javax.servlet.MultipartConfigElement; @Configuration @ComponentScan @EnableAutoConfiguration public class Application { @Bean public MultipartConfigElement multipartConfigElement() { MultiPartConfigFactory factory = new MultiPartConfigFactory(); factory.setMaxFileSize( "128KB" ); factory.setMaxRequestSize( "128KB" ); return factory.createMultipartConfig(); } public static void main(String[] args) { SpringApplication.run(Application. class , args); } } |
5. 然后访问http://localhost:8080/upload就可以看到页面了。
上面的例子是实现的是单个文件上传的功能,假定我们现在要实现文件批量上传的功能的话,我们只需要简单的修改一下上面的代码就行,考虑到篇幅的问题,下面只是贴出和上面不同的代码,没有贴出的说明和上面一样。:
1. 新增batchUpload.jsp文件
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
|
< html > < body > < form method = "POST" enctype = "multipart/form-data" action = "/batch/upload" > File to upload: < input type = "file" name = "file" >< br /> File to upload: < input type = "file" name = "file" >< br /> < input type = "submit" value = "Upload" > Press here to upload the file! </ form > </ body > </ html > |
2. 新增BatchFileUploadController.java文件:
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
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.multipart.MultipartFile; import org.springframework.web.multipart.MultipartHttpServletRequest; import javax.servlet.http.HttpServletRequest; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileOutputStream; import java.util.List; /** * Created by wenchao.ren on 2014/4/26. */ @Controller public class BatchFileUploadController { @RequestMapping (value= "/batch/upload" , method= RequestMethod.POST) public @ResponseBody String handleFileUpload(HttpServletRequest request){ List<MultipartFile> files = ((MultipartHttpServletRequest)request).getFiles( "file" ); for ( int i = 0 ; i< files.size(); ++i) { MultipartFile file = files.get(i); String name = file.getName(); if (!file.isEmpty()) { try { byte [] bytes = file.getBytes(); BufferedOutputStream stream = new BufferedOutputStream( new FileOutputStream( new File(name + i))); stream.write(bytes); stream.close(); } catch (Exception e) { return "You failed to upload " + name + " => " + e.getMessage(); } } else { return "You failed to upload " + name + " because the file was empty." ; } } return "upload successful" ; } } |
这样一个简单的批量上传文件的功能就ok了,是不是很简单啊。
注意:上面的代码只是为了演示而已,所以编码风格上采取了随性的方式,不建议大家模仿。
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/rollenholt/p/3693087.html