springboot实现文件上传下载.zip_springbootzip文件下载资源-CSDN文库

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在Spring Boot框架中，文件上传和下载是常见的功能需求，特别是在构建Web应用程序时。本教程将详细介绍如何使用Spring Boot实现这两个功能。我们需要引入相关的依赖。在`pom.xml`文件中添加Spring Web和MultipartFile处理的支持： ```xml <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency>  <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <optional>true</optional> </dependency>  <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.4</version> </dependency> <dependency> <groupId>org.apache.tomcat.embed</groupId> <artifactId>tomcat-embed-jasper</artifactId> <scope>provided</scope> </dependency> </dependencies> ``` 接着，创建一个简单的Controller来处理文件上传和下载的请求。例如，`Uploaddemo1Controller.java`： ```java import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.*; import org.springframework.web.multipart.MultipartFile; import java.io.File; import java.io.IOException; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; @Controller @RequestMapping("/uploaddemo1") public class Uploaddemo1Controller { private static final String UPLOAD_DIR = "uploads"; @Autowired public Uploaddemo1Controller() { File uploadDir = new File(UPLOAD_DIR); if (!uploadDir.exists()) { uploadDir.mkdir(); } } // 文件上传页面 @GetMapping public String uploadForm(Model model) { model.addAttribute("message", ""); return "uploadForm"; } // 处理文件上传请求 @PostMapping("/upload") public String handleFileUpload(@RequestParam("file") MultipartFile file, Model model) { if (!file.isEmpty()) { try { byte[] bytes = file.getBytes(); Path path = Paths.get(UPLOAD_DIR, file.getOriginalFilename()); Files.write(path, bytes); model.addAttribute("message", "文件上传成功！"); } catch (IOException e) { model.addAttribute("message", "文件上传失败：" + e.getMessage()); } } else { model.addAttribute("message", "请选择一个文件进行上传！"); } return "uploadForm"; } // 文件下载页面 @GetMapping("/download/{filename}") public void handleFileDownload(@PathVariable("filename") String filename, HttpServletResponse response) throws IOException { File file = new File(UPLOAD_DIR, filename); if (file.exists()) { response.setContentType("application/octet-stream"); response.setHeader("Content-Disposition", "attachment; filename=" + java.net.URLEncoder.encode(filename, "UTF-8")); Files.copy(file.toPath(), response.getOutputStream()); } else { throw new FileNotFoundException("文件不存在！"); } } } ``` 在这个控制器中，我们定义了两个方法：`uploadForm`用于展示上传文件的表单页面，`handleFileUpload`用于接收并处理文件上传的请求。`handleFileDownload`则处理文件下载请求，设置响应头以指示浏览器以附件形式下载文件。创建一个简单的Thymeleaf模板`uploadForm.html`，提供文件选择和提交按钮： ```html <!DOCTYPE html> <html xmlns:th="http://www.thymeleaf.org"> <head> <meta charset="UTF-8"> <title>文件上传</title> </head> <body> <h1>文件上传</h1> <form method="POST" enctype="multipart/form-data" th:action="@{/uploaddemo1/upload}"> <input type="file" name="file" required/> <button type="submit">上传文件</button> </form> <p th:text="${message}"></p> </body> </html> ``` 现在，你可以启动Spring Boot应用，访问`http://localhost:8080/uploaddemo1`，通过提供的表单上传文件。上传的文件会被保存到项目的`uploads`目录下。要下载文件，只需访问`http://localhost:8080/uploaddemo1/download/filename`，其中`filename`替换为实际的文件名。这个简单的示例展示了如何在Spring Boot中实现文件上传和下载的基本功能。在实际项目中，你可能需要考虑更多的因素，比如文件大小限制、安全问题（如防止路径遍历攻击）、错误处理等。对于大规模应用，可能还需要集成云存储服务，如阿里云OSS、AWS S3等。

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springboot实现文件上传下载.zip （47个子文件）

uploaddemo1

.gitignore 395B

.mvn

wrapper

maven-wrapper.jar 50KB

MavenWrapperDownloader.java 5KB

maven-wrapper.properties 218B

src

main

resources

templates

upload.html 375B

download.html 779B

static

application.properties 886B

java

com

example

uploaddemo1

entity

Upload1.java 804B

dao

Upload1Mapper.java 631B

controller

UploadController.java 5KB

IndexController.java 399B

Uploaddemo1Application.java 326B

test

java

com

example

uploaddemo1

Uploaddemo1ApplicationTests.java 220B

.classpath 2KB

HELP.md 1KB

mvnw 10KB

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org.eclipse.m2e.core.prefs 90B

org.eclipse.jdt.apt.core.prefs 69B

org.eclipse.core.resources.prefs 214B

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mvnw.cmd 6KB

target

classes

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MANIFEST.MF 164B

maven

com.example

uploaddemo1

pom.properties 224B

pom.xml 2KB

com

example

uploaddemo1

entity

Upload1.class 2KB

dao

Upload1Mapper.class 913B

controller

IndexController.class 627B

UploadController.class 6KB

Uploaddemo1Application.class 768B

templates

upload.html 375B

download.html 779B

static

files

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application.properties 886B

test-classes

com

example

uploaddemo1

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.project 716B

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