SpringBoot+BootStrap多文件上传到本地

1、application.yml文件配置

1 #  文件大小 MB必须大写
2 #  maxFileSize 是单个文件大小
3 #  maxRequestSize是设置总上传的数据大小
4 spring:
5   servlet:
6     multipart:
7       enabled: true
8       max-file-size: 20MB
9       max-request-size: 20MB

2、application-resources.yml配置（自定义属性）

1 #文件上传路径
2 file:
3   filepath: O:/QMDownload/Hotfix2/

3、后台代码

（1）FileService.java：

 1 package com.sun123.springboot.service;
 2 
 3 import org.springframework.web.multipart.MultipartFile;
 4 
 5 import java.util.Map;
 6 
 7 public interface FileService {
 8 
 9     Map<String,Object> fileUpload(MultipartFile[] file);
10 }

（2）FileServiceImpl.java：

 1 package com.sun123.springboot.service.impl;
 2 
 3 
 4 import com.sun123.springboot.FileUtil;
 5 import com.sun123.springboot.service.FileService;
 6 import org.slf4j.Logger;
 7 import org.slf4j.LoggerFactory;
 8 import org.springframework.beans.factory.annotation.Autowired;
 9 import org.springframework.beans.factory.annotation.Value;
10 import org.springframework.stereotype.Service;
11 import org.springframework.web.multipart.MultipartFile;
12 
13 import javax.servlet.http.HttpServletRequest;
14 import javax.servlet.http.HttpServletResponse;
15 import java.io.File;
16 import java.io.FileInputStream;
17 import java.io.PrintWriter;
18 import java.util.*;
19 
20 /**
21  * @ClassName FileServiceImpl
22  * @Description TODO
23  * @Date 2019/3/22 22:19
24  * @Version 1.0
25  */
26 @Service
27 public class FileServiceImpl implements FileService {
28     private static Logger log= LoggerFactory.getLogger(FileServiceImpl.class);
29 
30     //文件上传路径    @Service包含@Component
31     @Value("${file.filepath}")
32     private String filepath;
33 
34 　　 
35     Map<String, Object> resultMap = new LinkedHashMap<String, Object>();
36 　　//会将上传信息存入此处，根据需求自行调整
37     List<String> fileName =new ArrayList<String>();
38 
39     //必须注入，不可以创建对象，否则配置文件引用的路径属性为null
40     @Autowired
41     FileUtil fileUtil;
42 
43     @Override
44     public Map<String, Object> fileUpload(MultipartFile[] file) {
45        
46         HttpServletRequest request = null;
47         HttpServletResponse response;
48 
49         resultMap.put("status", 400);
50         if(file!=null&&file.length>0){
51             //组合image名称，“;隔开”
52 //            List<String> fileName =new ArrayList<String>();
53             PrintWriter out = null;
54             //图片上传
55 
56             try {
57                 for (int i = 0; i < file.length; i++) {
58                     if (!file[i].isEmpty()) {
59                         //上传文件，随机名称，","分号隔开
60                         fileName.add(fileUtil.uploadImage(request, filepath+"upload/"+ fileUtil.formateString(new Date())+"/", file[i], true)+fileUtil.getOrigName());
61 
62                     }
63                 }
64                 //上传成功
65                 if(fileName!=null&&fileName.size()>0){
66                     System.out.println("上传成功！");
67                     resultMap.put("images",fileName);
68                     resultMap.put("status", 200);
69                     resultMap.put("message", "上传成功！");
70                 }else {
71                     resultMap.put("status", 500);
72                     resultMap.put("message", "上传失败！文件格式错误！");
73                 }
74             } catch (Exception e) {
75                 e.printStackTrace();
76                 resultMap.put("status", 500);
77                 resultMap.put("message", "上传异常！");
78             }
79             System.out.println("==========filename=========="+fileName);
80 
81         }else {
82             resultMap.put("status", 500);
83             resultMap.put("message", "没有检测到有效文件！");
84         }
85         return resultMap;
86     }
87 
88     }

（3）FileUtil.java：

  1 package com.sun123.springboot;
  2 
  3 import org.springframework.beans.factory.annotation.Value;
  4 import org.springframework.stereotype.Component;
  5 import org.springframework.web.multipart.MultipartFile;
  6 
  7 import javax.servlet.http.HttpServletRequest;
  8 import java.io.File;
  9 import java.text.SimpleDateFormat;
 10 import java.util.Date;
 11 
 12 /**
 13  * Created by wangluming on 2018/5/24.
 14  */
 15 @Component
 16 public class FileUtil {
 17 
 18 //    //文件上传路径
 19 //    @Value("${file.filepath}")
 20 //    private String filepath;
 21 
 22     //文件随机名称
 23     private String origName;
 24 
 25     public String getOrigName() {
 26         return origName;
 27     }
 28 
 29     public void setOrigName(String origName) {
 30         this.origName = origName;
 31     }
 32 
 33     /**
 34      *
 35      * @param request
 36      * @param path_deposit 新增目录名 支持多级不存在目录
 37      * @param file 待文件
 38      * @param isRandomName 是否要基于图片名称重新编排名称
 39      * @return
 40      */
 41     public String uploadImage(HttpServletRequest request, String path_deposit, MultipartFile file, boolean isRandomName) {
 42 
 43 
 44         //上传
 45         try {
 46             String[] typeImg={"gif","png","jpg","docx","doc","pdf"};
 47 
 48             if(file!=null){
 49                 origName=file.getOriginalFilename();// 文件原名称
 50                 System.out.println("上传的文件原名称:"+origName);
 51                 // 判断文件类型
 52                 String type=origName.indexOf(".")!=-1?origName.substring(origName.lastIndexOf(".")+1, origName.length()):null;
 53                 if (type!=null) {
 54                     boolean booIsType=false;
 55                     for (int i = 0; i < typeImg.length; i++) {
 56                         if (typeImg[i].equals(type.toLowerCase())) {
 57                             booIsType=true;
 58                         }
 59                     }
 60                     //类型正确
 61                     if (booIsType) {
 62                         //存放图片文件的路径
 63                         //String path="O:\QMDownload\Hotfix\";
 64                         //String path=filepath;
 65                         //System.out.print("文件上传的路径"+path);
 66                         //组合名称
 67                         //String fileSrc = path+path_deposit;
 68                         String fileSrc = path_deposit;
 69                         //是否随机名称
 70                         if(isRandomName){
 71                             //随机名规则：文件名+_CY+当前日期+8位随机数+文件后缀名
 72                             origName=origName.substring(0,origName.lastIndexOf("."))+"_CY"+formateString(new Date())+
 73                                     MathUtil.getRandom620(8)+origName.substring(origName.lastIndexOf("."));
 74                         }
 75                         System.out.println("随机文件名："+origName);
 76                         //判断是否存在目录
 77                         File targetFile=new File(fileSrc,origName);
 78                         if(!targetFile.exists()){
 79                             targetFile.getParentFile().mkdirs();//创建目录
 80                         }
 81 
 82                         //上传
 83                         file.transferTo(targetFile);
 84                         //完整路径
 85                         System.out.println("完整路径:"+targetFile.getAbsolutePath());
 86                         return fileSrc;
 87                     }
 88                 }
 89             }
 90             return null;
 91         }catch (Exception e) {
 92             e.printStackTrace();
 93             return null;
 94         }
 95     }
 96 
 97     /**
 98      * 格式化日期并去掉”-“
 99      * @param date
100      * @return
101      */
102     public String formateString(Date date){
103         SimpleDateFormat dateFormater = new SimpleDateFormat("yyyy-MM-dd");
104         String list[] = dateFormater.format(date).split("-");
105         String result = "";
106         for (int i=0;i<list.length;i++) {
107             result += list[i];
108         }
109         return result;
110     }
111 }

（4）MathUtil.java：

 1 package com.sun123.springboot;
 2 
 3 import java.security.MessageDigest;
 4 import java.util.Random;
 5 
 6 public class MathUtil {
 7     /**
 8      * 获取随机的数值。
 9      * @param length    长度
10      * @return
11      */
12     public static String getRandom620(Integer length){
13         String result = "";
14         Random rand = new Random();
15         int n = 20;
16         if(null != length && length > 0){
17             n = length;
18         }
19         boolean[]  bool = new boolean[n];
20         int randInt = 0;
21         for(int i = 0; i < length ; i++) {
22             do {
23                 randInt  = rand.nextInt(n);
24 
25             }while(bool[randInt]);
26 
27             bool[randInt] = true;
28             result += randInt;
29         }
30         return result;
31     }
32     /**
33      * MD5 加密
34      * @param str
35      * @return
36      * @throws Exception
37      */
38     public static String  getMD5(String str) {
39         MessageDigest messageDigest = null;
40         try {
41             messageDigest = MessageDigest.getInstance("MD5");
42             messageDigest.reset();
43             messageDigest.update(str.getBytes("UTF-8"));
44         } catch (Exception e) {
45             //LoggerUtils.fmtError(MathUtil.class,e, "MD5转换异常！message：%s", e.getMessage());
46         }
47 
48         byte[] byteArray = messageDigest.digest();
49         StringBuffer md5StrBuff = new StringBuffer();
50         for (int i = 0; i < byteArray.length; i++) {
51             if (Integer.toHexString(0xFF & byteArray[i]).length() == 1)
52                 md5StrBuff.append("0").append(Integer.toHexString(0xFF & byteArray[i]));
53             else
54                 md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));
55         }
56         return md5StrBuff.toString();
57     }
58 }

（5）FileController.java：

 1 package com.sun123.springboot.controller;
 2 
 3 import com.sun123.springboot.service.FileService;
 4 import org.springframework.beans.factory.annotation.Autowired;
 5 import org.springframework.stereotype.Controller;
 6 import org.springframework.web.bind.annotation.RequestMapping;
 7 import org.springframework.web.bind.annotation.RequestParam;
 8 import org.springframework.web.bind.annotation.ResponseBody;
 9 import org.springframework.web.multipart.MultipartFile;
10 
11 import java.util.Map;
12 
13 /**
14  * @ClassName FileController
15  * @Description TODO
16  * @Date 2019/3/22 22:21
17  * @Version 1.0
18  */
19 @Controller
20 @RequestMapping(value = "/upload")
21 public class FileController {
22 
23     @Autowired
24     private FileService fileService;
25 
26     @RequestMapping(value = "/UpLoadImage")
27     @ResponseBody
28     public Map<String,Object> fileUpload(@RequestParam("file") MultipartFile[] file) throws Exception {
29         Map<String, Object> fileUpload = fileService.fileUpload(file);
30         return fileUpload;
31     }
32 }

4、前台代码（bootstrap）

 1 <div class="container" th:fragment="fileupload">
 2         <input id="uploadfile" type="file" class="file" multiple="multiple" name="file"/>
 3 
 4     </div>
 5 
 6 
 7 <script>
 8     $("#uploadfile").fileinput({
 9 
10         language: 'zh', //设置语言
11 
12         //uploadUrl: "http://127.0.0.1/testDemo/fileupload/upload.do", //上传的地址
13         uploadUrl: "/upload/UpLoadImage", //上传的地址
14 
15         allowedFileExtensions: ['jpg', 'gif', 'png', 'docx', 'zip', 'txt'], //接收的文件后缀
16 
17         //uploadExtraData:{"id": 1, "fileName":'123.mp3'},
18         showClose: false,//是否显示关闭按钮
19 
20         uploadAsync: true, //默认异步上传
21 
22         showUpload: true, //是否显示上传按钮
23 
24         //showBrowse: true, //是否显示浏览按钮
25 
26         showRemove: true, //显示移除按钮
27 
28         showPreview: true, //是否显示预览
29 
30         showCaption: false, //是否显示标题
31 
32         browseClass: "btn btn-primary", //按钮样式
33 
34         dropZoneEnabled: true, //是否显示拖拽区域
35 
36         //previewFileType: ['docx'], //预览文件类型
37         //minImageWidth: 50, //图片的最小宽度
38 
39         //minImageHeight: 50,//图片的最小高度
40 
41         //maxImageWidth: 1000,//图片的最大宽度
42 
43         //maxImageHeight: 1000,//图片的最大高度
44 
45         maxFileSize:0,//单位为kb，如果为0表示不限制文件大小
46 
47         //minFileCount: 0,
48 
49         maxFileCount: 10, //表示允许同时上传的最大文件个数
50 
51         enctype: 'multipart/form-data',
52 
53         validateInitialCount: true,
54 
55         previewFileIcon: "<iclass='glyphicon glyphicon-king'></i>",
56 
57         msgFilesTooMany: "选择上传的文件数量({n}) 超过允许的最大数值{m}！",
58 
59     }).on("fileuploaded", function (event, data, previewId, index) {
60 
61 
62     });
63 </script>
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原文地址：https://www.cnblogs.com/116970u/p/10583176.html