Spring?Boot實現(xiàn)文件上傳下載

更新時間：2022年08月14日 14:47:38 作者：云淡風(fēng)輕58

這篇文章主要為大家詳細介紹了Spring?Boot實現(xiàn)文件上傳下載，文中示例代碼介紹的非常詳細，具有一定的參考價值，感興趣的小伙伴們可以參考一下

本文實例為大家分享了Spring Boot實現(xiàn)文件上傳下載的具體代碼，供大家參考，具體內(nèi)容如下

示例【Spring Boot 文件上傳下載】

程序清單：/springboot2/src/main/resources/templates/register.html

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>注冊</title>
<link rel="stylesheet" th:href="@{css/bootstrap.min.css}" >
<link rel="stylesheet" th:href="@{css/bootstrap-theme.min.css}" />
<script type="text/javascript" th:src="@{js/jquery-1.11.0.min.js}"></script>
<script type="text/javascript" th:src="@{js/bootstrap.min.js}"></script>
</head>
<body>
?? ?<div class="panel panel-primary">
?? ??? ?<div class="panel-heading">
?? ??? ??? ?<h3 class="panel-title">Spring Boot文件上傳</h3>
?? ??? ?</div>
?? ?</div>
?? ?<div class="container">
?? ??? ?<div class="row">
?? ??? ??? ?<div class="col-md-8">
?? ??? ??? ??? ?<form action="upload" method="post" enctype="multipart/form-data">
?? ??? ??? ??? ??? ?<div class="form-group">
?? ??? ??? ??? ??? ??? ?<div class="input-group col-md-4">
?? ??? ??? ??? ??? ??? ??? ?<span class="input-group-addon">
?? ??? ??? ??? ??? ??? ??? ??? ?<i class="glyphicon glyphicon-user"></i>
?? ??? ??? ??? ??? ??? ??? ?</span>
?? ??? ??? ??? ??? ??? ??? ?<input class="form-control" type="text" name="userName">
?? ??? ??? ??? ??? ??? ?</div>
?? ??? ??? ??? ??? ?</div>
?? ??? ??? ??? ??? ?<div class="form-group">
?? ??? ??? ??? ??? ??? ?<div class="input-group col-md-4">
?? ??? ??? ??? ??? ??? ??? ?<span class="input-group-addon">
?? ??? ??? ??? ??? ??? ??? ??? ?<i class="glyphicon glyphicon-search"></i>
?? ??? ??? ??? ??? ??? ??? ?</span>
?? ??? ??? ??? ??? ??? ??? ?<input class="form-control" type="file" name="head">
?? ??? ??? ??? ??? ??? ?</div>
?? ??? ??? ??? ??? ?</div>
?? ??? ??? ??? ??? ?<div class="form-group">
?? ??? ??? ??? ??? ??? ?<div class="col-md-4">
?? ??? ??? ??? ??? ??? ??? ?<button type="submit" class="btn btn-success">注冊</button>
?? ??? ??? ??? ??? ??? ?</div>
?? ??? ??? ??? ??? ?</div>
?? ??? ??? ??? ?</form>
?? ??? ??? ?</div>
?? ??? ?</div>
?? ?</div>
</body>
</html>

程序清單：/springboot2/src/main/resources/templates/userInfo.html

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>用戶信息</title>
<link rel="stylesheet" th:href="@{css/bootstrap.min.css}" >
<link rel="stylesheet" th:href="@{css/bootstrap-theme.min.css}" />
<script type="text/javascript" th:src="@{js/jquery-1.11.0.min.js}"></script>
<script type="text/javascript" th:src="@{js/bootstrap.min.js}"></script>
</head>
<body>
?? ?<div class="panel panel-primary">
?? ??? ?<div class="panel-heading">
?? ??? ??? ?<h3 class="panel-title">Spring Boot文件下載</h3>
?? ??? ?</div>
?? ?</div>
?? ?<div class="container">
?? ??? ?<div class="panel panel-primary">
?? ??? ??? ?<div class="panel-heading">
?? ??? ??? ??? ?<h3 class="panel-title">用戶信息列表</h3>
?? ??? ??? ?</div>
?? ??? ?</div>
?? ??? ?<div class="panel-body">
?? ??? ??? ?<div class="table table-responsive">
?? ??? ??? ??? ?<table class="table table-bordered" id="userTable">
?? ??? ??? ??? ??? ?<tbody class="text-center">
?? ??? ??? ??? ??? ??? ?<tr>
?? ??? ??? ??? ??? ??? ??? ?<td><img th:src="@{'upload/'+${user.head.originalFilename}}" height="30"></td>
?? ??? ??? ??? ??? ??? ??? ?<td th:text="${user.userName}">用戶名</td>
?? ??? ??? ??? ??? ??? ??? ?<td><a th:href="@{download(filename=${user.head.originalFilename })}" >下載</a></td>
?? ??? ??? ??? ??? ??? ?</tr>
?? ??? ??? ??? ??? ?</tbody>
?? ??? ??? ??? ?</table>
?? ??? ??? ?</div>
?? ??? ?</div>
?? ?</div>
</body>
</html>

程序清單：/springboot2/src/main/java/com/dwx/hello/User.java

package com.dwx.hello;
import org.springframework.web.multipart.MultipartFile;
public class User {
?? ?private String userName;
?? ?private MultipartFile head;
?? ?public String getUserName() {
?? ??? ?return userName;
?? ?}
?? ?public void setUserName(String userName) {
?? ??? ?this.userName = userName;
?? ?}
?? ?public MultipartFile getHead() {
?? ??? ?return head;
?? ?}
?? ?public void setHead(MultipartFile head) {
?? ??? ?this.head = head;
?? ?}
}

程序清單：/springboot2/src/main/java/com/dwx/hello/UserController.java

package com.dwx.hello;
import java.io.File;
import java.io.IOException;
import java.net.URLEncoder;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.io.FileUtils;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.http.ResponseEntity.BodyBuilder;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
@Controller
public class UserController {
?? ?@RequestMapping("/registerForm")
?? ?public String registerForm() {
?? ??? ?return "register";
?? ?}
?? ?@RequestMapping("/upload")
?? ?public String upload(HttpServletRequest request,
?? ??? ??? ?@ModelAttribute User user,Model model) throws IllegalStateException, IOException {
?? ??? ?if(!user.getHead().isEmpty()) {
?? ??? ??? ?String path=request.getServletContext().getRealPath("/upload");
?? ??? ??? ?String fileName=user.getHead().getOriginalFilename();
?? ??? ??? ?File filePath=new File(path,fileName);
?? ??? ??? ?if(!filePath.getParentFile().exists()) {
?? ??? ??? ??? ?filePath.getParentFile().mkdirs();
?? ??? ??? ?}
?? ??? ??? ?user.getHead().transferTo(new File(path+File.separator+fileName));
?? ??? ??? ?model.addAttribute("user", user);
?? ??? ??? ?return "userInfo";
?? ??? ?}else {
?? ??? ??? ?return "error";
?? ??? ?}
?? ?}
?? ?@RequestMapping(value="/download")
?? ? public ResponseEntity<byte[]> download(HttpServletRequest request,
?? ??? ??? ? @RequestParam("filename") String filename,
?? ??? ??? ? @RequestHeader("User-Agent") String userAgent,
?? ??? ??? ? Model model)throws Exception{
?? ??? ?// 下載文件路徑
?? ??? ?String path = request.getServletContext().getRealPath(
? ? ? ? ? ? ? ?"/upload/");
?? ??? ?// 構(gòu)建File
?? ??? ?File file = new File(path+File.separator+ filename);
?? ??? ?// ok表示Http協(xié)議中的狀態(tài) 200
? ? ? ?BodyBuilder builder = ResponseEntity.ok();
? ? ? ?// 內(nèi)容長度
? ? ? ?builder.contentLength(file.length());
? ? ? ?// application/octet-stream ： 二進制流數(shù)據(jù)（最常見的文件下載）。
? ? ? ?builder.contentType(MediaType.APPLICATION_OCTET_STREAM);
? ? ? ?// 使用URLDecoder.decode對文件名進行解碼
? ? ? ?filename = URLEncoder.encode(filename, "UTF-8");
? ? ? ?// 設(shè)置實際的響應(yīng)文件名，告訴瀏覽器文件要用于【下載】、【保存】attachment 以附件形式
? ? ? ?// 不同的瀏覽器，處理方式不同，要根據(jù)瀏覽器版本進行區(qū)別判斷
? ? ? ?if (userAgent.indexOf("MSIE") > 0) {
? ? ? ? ? ? ? ?// 如果是IE，只需要用UTF-8字符集進行URL編碼即可
? ? ? ? ? ? ? ?builder.header("Content-Disposition", "attachment; filename=" + filename);
? ? ? ?} else {
? ? ? ? ? ? ? ?// 而FireFox、Chrome等瀏覽器，則需要說明編碼的字符集
? ? ? ? ? ? ? ?// 注意filename后面有個*號，在UTF-8后面有兩個單引號！
? ? ? ? ? ? ? ?builder.header("Content-Disposition", "attachment; filename*=UTF-8''" + filename);
? ? ? ?}
? ? ? ?return builder.body(FileUtils.readFileToByteArray(file));
?? ? }
}

運行Spring Boot項目，訪問以下地址：http://localhost:8080/registerForm