这篇文章主要为大家详细介绍了Spring Boot实现文件上传下载，文中示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下
本文实例为大家分享了Spring Boot实现文件上传下载的具体代码，供大家参考，具体内容如下
示例【Spring Boot 文件上传下载】
程序清单：/springboot2/src/main/resources/templates/register.html
<!DOCTYPE html> <html xmlns:th="http://www.thymeleaf.org"> <head> <meta charset="UTF-8"> <title>注册</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文件上传</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">注册</button> </div> </div> </form> </div> </div> </div> </body> </html>
程序清单：/springboot2/src/main/resources/templates/userInfo.html
<!DOCTYPE html> <html xmlns:th="http://www.thymeleaf.org"> <head> <meta charset="UTF-8"> <title>用户信息</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文件下载</h3> </div> </div> <div class="container"> <div class="panel panel-primary"> <div class="panel-heading"> <h3 class="panel-title">用户信息列表</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}">用户名</td> <td><a th:href="@{download(filename=${user.head.originalFilename })}" >下载</a></td> </tr> </tbody> </table> </div> </div> </div> </body> </html>
程序清单：/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;
}
}程序清单：/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{ // 下载文件路径 String path = request.getServletContext().getRealPath( "/upload/"); // 构建File File file = new File(path+File.separator+ filename); // ok表示Http协议中的状态 200 BodyBuilder builder = ResponseEntity.ok(); // 内容长度 builder.contentLength(file.length()); // application/octet-stream ： 二进制流数据（最常见的文件下载）。 builder.contentType(MediaType.APPLICATION_OCTET_STREAM); // 使用URLDecoder.decode对文件名进行解码 filename = URLEncoder.encode(filename, "UTF-8"); // 设置实际的响应文件名，告诉浏览器文件要用于【下载】、【保存】attachment 以附件形式 // 不同的浏览器，处理方式不同，要根据浏览器版本进行区别判断 if (userAgent.indexOf("MSIE") > 0) { // 如果是IE，只需要用UTF-8字符集进行URL编码即可 builder.header("Content-Disposition", "attachment; filename=" + filename); } else { // 而FireFox、Chrome等浏览器，则需要说明编码的字符集 // 注意filename后面有个*号，在UTF-8后面有两个单引号！ builder.header("Content-Disposition", "attachment; filename*=UTF-8''" + filename); } return builder.body(FileUtils.readFileToByteArray(file)); } }
运行Spring Boot项目，访问以下地址：http://localhost:8080/registerForm
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