SpringBoot+BootStrap多文件上传到本地

1、application.yml文件配置

 #  文件大小 MB必须大写
 #  maxFileSize 是单个文件大小
 #  maxRequestSize是设置总上传的数据大小
 spring:
   servlet:
     multipart:
       enabled: true
       max-file-size: 20MB
       max-request-size: 20MB

2、application-resources.yml配置（自定义属性）

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

3、后台代码

（1）FileService.java：

 package com.sun123.springboot.service;

 import org.springframework.web.multipart.MultipartFile;

 import java.util.Map;

 public interface FileService {

     Map<String,Object> fileUpload(MultipartFile[] file);
 }

（2）FileServiceImpl.java：

 package com.sun123.springboot.service.impl;

 import com.sun123.springboot.FileUtil;
 import com.sun123.springboot.service.FileService;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.stereotype.Service;
 import org.springframework.web.multipart.MultipartFile;

 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.PrintWriter;
 import java.util.*;

 /**
  * @ClassName FileServiceImpl
  * @Description TODO
  * @Date 2019/3/22 22:19
  * @Version 1.0
  */
 @Service
 public class FileServiceImpl implements FileService {
     private static Logger log= LoggerFactory.getLogger(FileServiceImpl.class);

     //文件上传路径    @Service包含@Component
     @Value("${file.filepath}")
     private String filepath;

 　　
     Map<String, Object> resultMap = new LinkedHashMap<String, Object>();
 　　//会将上传信息存入此处，根据需求自行调整
     List<String> fileName =new ArrayList<String>();

     //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
     @Autowired
     FileUtil fileUtil;

     @Override
     public Map<String, Object> fileUpload(MultipartFile[] file) {

         HttpServletRequest request = null;
         HttpServletResponse response;

         resultMap.put("status", 400);
         if(file!=null&&file.length>0){
             //组合image名称，“;隔开”
 //            List<String> fileName =new ArrayList<String>();
             PrintWriter out = null;
             //图片上传

             try {
                 for (int i = 0; i < file.length; i++) {
                     if (!file[i].isEmpty()) {
                         //上传文件，随机名称，","分号隔开
                         fileName.add(fileUtil.uploadImage(request, filepath+"upload/"+ fileUtil.formateString(new Date())+"/", file[i], true)+fileUtil.getOrigName());

                     }
                 }
                 //上传成功
                 if(fileName!=null&&fileName.size()>0){
                     System.out.println("上传成功！");
                     resultMap.put("images",fileName);
                     resultMap.put("status", 200);
                     resultMap.put("message", "上传成功！");
                 }else {
                     resultMap.put("status", 500);
                     resultMap.put("message", "上传失败！文件格式错误！");
                 }
             } catch (Exception e) {
                 e.printStackTrace();
                 resultMap.put("status", 500);
                 resultMap.put("message", "上传异常！");
             }
             System.out.println("==========filename=========="+fileName);

         }else {
             resultMap.put("status", 500);
             resultMap.put("message", "没有检测到有效文件！");
         }
         return resultMap;
     }

     }

（3）FileUtil.java：

 package com.sun123.springboot;

 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.stereotype.Component;
 import org.springframework.web.multipart.MultipartFile;

 import javax.servlet.http.HttpServletRequest;
 import java.io.File;
 import java.text.SimpleDateFormat;
 import java.util.Date;

 /**
  * Created by wangluming on 2018/5/24.
  */
 @Component
 public class FileUtil {

 //    //文件上传路径
 //    @Value("${file.filepath}")
 //    private String filepath;

     //文件随机名称
     private String origName;

     public String getOrigName() {
         return origName;
     }

     public void setOrigName(String origName) {
         this.origName = origName;
     }

     /**
      *
      * @param request
      * @param path_deposit 新增目录名 支持多级不存在目录
      * @param file 待文件
      * @param isRandomName 是否要基于图片名称重新编排名称
      * @return
      */
     public String uploadImage(HttpServletRequest request, String path_deposit, MultipartFile file, boolean isRandomName) {

         //上传
         try {
             String[] typeImg={"gif","png","jpg","docx","doc","pdf"};

             if(file!=null){
                 origName=file.getOriginalFilename();// 文件原名称
                 System.out.println("上传的文件原名称:"+origName);
                 // 判断文件类型
                 String type=origName.indexOf(".")!=-1?origName.substring(origName.lastIndexOf(".")+1, origName.length()):null;
                 if (type!=null) {
                     boolean booIsType=false;
                     for (int i = 0; i < typeImg.length; i++) {
                         if (typeImg[i].equals(type.toLowerCase())) {
                             booIsType=true;
                         }
                     }
                     //类型正确
                     if (booIsType) {
                         //存放图片文件的路径
                         //String path="O:\\QMDownload\\Hotfix\\";
                         //String path=filepath;
                         //System.out.print("文件上传的路径"+path);
                         //组合名称
                         //String fileSrc = path+path_deposit;
                         String fileSrc = path_deposit;
                         //是否随机名称
                         if(isRandomName){
                             //随机名规则：文件名+_CY+当前日期+8位随机数+文件后缀名
                             origName=origName.substring(0,origName.lastIndexOf("."))+"_CY"+formateString(new Date())+
                                     MathUtil.getRandom620(8)+origName.substring(origName.lastIndexOf("."));
                         }
                         System.out.println("随机文件名："+origName);
                         //判断是否存在目录
                         File targetFile=new File(fileSrc,origName);
                         if(!targetFile.exists()){
                             targetFile.getParentFile().mkdirs();//创建目录
                         }

                         //上传
                         file.transferTo(targetFile);
                         //完整路径
                         System.out.println("完整路径:"+targetFile.getAbsolutePath());
                         return fileSrc;
                     }
                 }
             }
             return null;
         }catch (Exception e) {
             e.printStackTrace();
             return null;
         }
     }

     /**
      * 格式化日期并去掉”-“
      * @param date
      * @return
      */
     public String formateString(Date date){
         SimpleDateFormat dateFormater = new SimpleDateFormat("yyyy-MM-dd");
         String list[] = dateFormater.format(date).split("-");
         String result = "";
         for (int i=0;i<list.length;i++) {
             result += list[i];
         }
         return result;
     }
 }

（4）MathUtil.java：

 package com.sun123.springboot;

 import java.security.MessageDigest;
 import java.util.Random;

 public class MathUtil {
     /**
      * 获取随机的数值。
      * @param length    长度
      * @return
      */
     public static String getRandom620(Integer length){
         String result = "";
         Random rand = new Random();
         int n = 20;
         if(null != length && length > 0){
             n = length;
         }
         boolean[]  bool = new boolean[n];
         int randInt = 0;
         for(int i = 0; i < length ; i++) {
             do {
                 randInt  = rand.nextInt(n);

             }while(bool[randInt]);

             bool[randInt] = true;
             result += randInt;
         }
         return result;
     }
     /**
      * MD5 加密
      * @param str
      * @return
      * @throws Exception
      */
     public static String  getMD5(String str) {
         MessageDigest messageDigest = null;
         try {
             messageDigest = MessageDigest.getInstance("MD5");
             messageDigest.reset();
             messageDigest.update(str.getBytes("UTF-8"));
         } catch (Exception e) {
             //LoggerUtils.fmtError(MathUtil.class,e, "MD5转换异常！message：%s", e.getMessage());
         }

         byte[] byteArray = messageDigest.digest();
         StringBuffer md5StrBuff = new StringBuffer();
         for (int i = 0; i < byteArray.length; i++) {
             if (Integer.toHexString(0xFF & byteArray[i]).length() == 1)
                 md5StrBuff.append("0").append(Integer.toHexString(0xFF & byteArray[i]));
             else
                 md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));
         }
         return md5StrBuff.toString();
     }
 }

（5）FileController.java：

 package com.sun123.springboot.controller;

 import com.sun123.springboot.service.FileService;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.ResponseBody;
 import org.springframework.web.multipart.MultipartFile;

 import java.util.Map;

 /**
  * @ClassName FileController
  * @Description TODO
  * @Date 2019/3/22 22:21
  * @Version 1.0
  */
 @Controller
 @RequestMapping(value = "/upload")
 public class FileController {

     @Autowired
     private FileService fileService;

     @RequestMapping(value = "/UpLoadImage")
     @ResponseBody
     public Map<String,Object> fileUpload(@RequestParam("file") MultipartFile[] file) throws Exception {
         Map<String, Object> fileUpload = fileService.fileUpload(file);
         return fileUpload;
     }
 }

4、前台代码（bootstrap）

 <div class="container" th:fragment="fileupload">
         <input id="uploadfile" type="file" class="file" multiple="multiple" name="file"/>

     </div>

 <script>
     $("#uploadfile").fileinput({

         language: 'zh', //设置语言

         //uploadUrl: "http://127.0.0.1/testDemo/fileupload/upload.do", //上传的地址
         uploadUrl: "/upload/UpLoadImage", //上传的地址

         allowedFileExtensions: ['jpg', 'gif', 'png', 'docx', 'zip', 'txt'], //接收的文件后缀

         //uploadExtraData:{"id": 1, "fileName":'123.mp3'},
         showClose: false,//是否显示关闭按钮

         uploadAsync: true, //默认异步上传

         showUpload: true, //是否显示上传按钮

         //showBrowse: true, //是否显示浏览按钮

         showRemove: true, //显示移除按钮

         showPreview: true, //是否显示预览

         showCaption: false, //是否显示标题

         browseClass: "btn btn-primary", //按钮样式

         dropZoneEnabled: true, //是否显示拖拽区域

         //previewFileType: ['docx'], //预览文件类型
         //minImageWidth: 50, //图片的最小宽度

         //minImageHeight: 50,//图片的最小高度

         //maxImageWidth: 1000,//图片的最大宽度

         //maxImageHeight: 1000,//图片的最大高度

         maxFileSize:0,//单位为kb，如果为0表示不限制文件大小

         //minFileCount: 0,

         maxFileCount: 10, //表示允许同时上传的最大文件个数

         enctype: 'multipart/form-data',

         validateInitialCount: true,

         previewFileIcon: "<iclass='glyphicon glyphicon-king'></i>",

         msgFilesTooMany: "选择上传的文件数量({n}) 超过允许的最大数值{m}！",

     }).on("fileuploaded", function (event, data, previewId, index) {

     });
 </script>