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: 20MB2、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.*;
@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("${file.filepath}")
private String filepath;
Map<String, Object> resultMap = new LinkedHashMap<String, Object>();
//会将上传信息存入此处，根据需求自行调整
List<String> fileName =new ArrayList<String>();
//必须注入，不可以创建对象，否则配置文件引用的路径属性为null
@Autowired
FileUtil fileUtil;
@Override
public Map<String, Object> fileUpload(MultipartFile[] file) {
HttpServletRequest request = null;
HttpServletResponse response;
resultMap.put("status", 400);
if(file!=null&&file.length>0){
//组合image名称，“;隔开”
// List<String> fileName =new ArrayList<String>();
PrintWriter out = null;
//图片上传
try {
for (int i = 0; i < file.length; i++) {
if (!file[i].isEmpty()) {
//上传文件，随机名称，","分号隔开
fileName.add(fileUtil.uploadImage(request, filepath+"upload/"+ fileUtil.formateString(new Date())+"/", file[i], true)+fileUtil.getOrigName());
}
}
//上传成功
if(fileName!=null&&fileName.size()>0){
System.out.println("上传成功！");
resultMap.put("images",fileName);
resultMap.put("status", 200);
resultMap.put("message", "上传成功！");
}else {
resultMap.put("status", 500);
resultMap.put("message", "上传失败！文件格式错误！");
}
} catch (Exception e) {
e.printStackTrace();
resultMap.put("status", 500);
resultMap.put("message", "上传异常！");
}
System.out.println("==========filename=========="+fileName);
}else {
resultMap.put("status", 500);
resultMap.put("message", "没有检测到有效文件！");
}
return resultMap;
}
}（3）FileUtil.java
package com.sun123.springboot;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;
@Component
public class FileUtil {
// //文件上传路径
// @Value("${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;
}
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;
}
}
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 {
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;
}
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;
@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>以上为个人经验，希望能给大家一个参考，也希望大家多多支持编程网。
