释放双眼，带上耳机，听听看~！
在一个系统中，文件上传模块肯定是少不了的，例如头像上传，展示轮播图等等，所以本章我们来添加上传文件功能
一：添加commons-fileupload依赖
打开pom文件添加
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2 <groupId>commons-fileupload</groupId>
3 <artifactId>commons-fileupload</artifactId>
4 <version>1.3.1</version>
5</dependency>
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二：添加系统变量
打开core→constant文件，添加文件保存路径
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2public static final String SAVEFILEPATH = "F://img";
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三：添加文件上传限制
创建core→configurer→MultipartConfigurer.java
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3import org.springframework.boot.web.servlet.MultipartConfigFactory;
4import org.springframework.context.annotation.Bean;
5import org.springframework.context.annotation.Configuration;
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7import javax.servlet.MultipartConfigElement;
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9@Configuration
10public class MultipartConfigurer {
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12 @Bean
13 public MultipartConfigElement multipartConfigElement(){
14 MultipartConfigFactory factory=new MultipartConfigFactory();
15 factory.setMaxFileSize("10MB");
16 factory.setMaxRequestSize("10MB");
17 return factory.createMultipartConfig();
18 }
19}
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四：创建文件上传工具类
创建core→utils→UploadActionUtil.java
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3import com.example.demo.core.constant.ProjectConstant;
4import org.springframework.web.multipart.MultipartFile;
5import org.springframework.web.multipart.MultipartHttpServletRequest;
6import org.springframework.web.multipart.commons.CommonsMultipartResolver;
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8import javax.servlet.http.HttpServletRequest;
9import java.io.File;
10import java.text.SimpleDateFormat;
11import java.util.*;
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13/**
14 * @author phubing
15 * 文件上传控制器
16 */
17public class UploadActionUtil {
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19 public static List<String> uploadFile(HttpServletRequest request) throws Exception {
20 List<String> list = new ArrayList<>();
21 CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(
22 request.getSession().getServletContext());
23 if (multipartResolver.isMultipart(request)) {
24 MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
25 Iterator<String> iterator = multiRequest.getFileNames();
26 while (iterator.hasNext()) {
27 // 取得上传文件
28 MultipartFile file = multiRequest.getFile(iterator.next());
29 if (file != null) {
30 // 取得当前上传文件的文件名称
31 String myFileName = file.getOriginalFilename();
32 // 如果名称不为“”,说明该文件存在，否则说明该文件不存在
33 if (myFileName.trim() != "") {
34 String fileTyps = myFileName.substring(myFileName.lastIndexOf("."));
35 // String tempName="demo"+fileTyps;
36 String tempName = UUID.randomUUID().toString() + fileTyps;
37 // 创建文件夹
38 String folderPath = ProjectConstant.SAVEFILEPATH + File.separator + folderName();
39 File fileFolder = new File(folderPath);
40 if (!fileFolder.exists() && !fileFolder.isDirectory()) {
41 fileFolder.mkdir();
42 }
43 File uploadFile = new File(folderPath + File.separator + tempName);
44 file.transferTo(uploadFile);
45 myFileName = folderName() + File.separator + tempName;
46 list.add(ProjectConstant.SAVEFILEPATH + "//" + myFileName);
47 }
48 }
49 }
50 }
51 return list;
52 }
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54 /**
55 * 得年月日的文件夹名称
56 *
57 * @return
58 */
59 public static String getCurrentFilderName() throws Exception{
60 Calendar now = Calendar.getInstance();
61 return now.get(Calendar.YEAR) + "" + (now.get(Calendar.MONTH) + 1) + "" + now.get(Calendar.DAY_OF_MONTH);
62 }
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64 /**
65 * 创建文件夹
66 *
67 * @param filderName
68 */
69 public static void createFilder(String filderName) throws Exception {
70 File file = new File(filderName);
71 // 如果文件夹不存在则创建
72 if (!file.exists() && !file.isDirectory()) {
73 file.mkdirs();
74 }
75 }
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77 /**
78 * 文件扩展名
79 *
80 * @param fileName
81 * @return
82 */
83 public static String extFile(String fileName) throws Exception{
84 return fileName.substring(fileName.lastIndexOf("."));
85 }
86
87 /**
88 * 当前日期当文件夹名
89 *
90 * @return
91 */
92 public static String folderName() throws Exception {
93 SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
94 String str = sdf.format(new Date());
95 return str;
96 }
97}
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五：创建UploadFileController
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3import com.example.demo.core.ret.RetResponse;
4import com.example.demo.core.ret.RetResult;
5import com.example.demo.core.utils.UploadActionUtil;
6import org.springframework.web.bind.annotation.PostMapping;
7import org.springframework.web.bind.annotation.RequestMapping;
8import org.springframework.web.bind.annotation.RestController;
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10import javax.servlet.http.HttpServletRequest;
11import java.util.List;
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13@RestController
14@RequestMapping("/uploadFile")
15public class UploadFileController {
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17 @PostMapping("/upload")
18 public RetResult<List<String>> upload(HttpServletRequest httpServletRequest) throws Exception {
19 List<String> list = UploadActionUtil.uploadFile(httpServletRequest);
20 return RetResponse.makeOKRsp(list);
21 }
22}
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六：测试
打开postman
输入localhost:8080/uploadFile/upload
注意：请求参数如下
返回值为文件存储的路径
打开设置好的存储路径
ok，上传成功
