基于springboot的文件上传下载的介绍
时间: 2023-10-28 08:42:56 浏览: 65
Sure, I can answer that! Spring Boot provides a convenient way to upload and download files through the use of the Spring MVC framework. To enable file upload/download, you need to add the necessary dependencies to your project, configure the controller to handle file requests, and then use JSP or Thymeleaf to display the uploaded files or download links. Do you need more detailed instructions on how to do this?
相关问题
springboot文件下载上传
在Spring框架中,文件上传是指将本地文件上传到服务器上,让其他用户可以浏览和下载这些文件。Spring提供了对文件上传的封装,我们只需要在Controller方法中声明一个MultipartFile类型的参数来接收上传的文件即可。
为了控制文件上传的大小,我们可以在application.yml或application.properties文件中进行设置。通过修改servlet.multipart.max-file-size和servlet.multipart.max-request-size属性,我们可以限制文件的上传大小和请求携带数据的大小。例如,可以使用以下配置将文件上传大小限制为100MB:
```
spring.servlet.multipart.max-file-size=100MB
spring.servlet.multipart.max-request-size=100MB
```
另外,在Spring MVC中,文件下载可以通过在Controller方法中返回一个ResponseEntity对象来实现。我们可以指定文件的类型、长度和内容,然后将其作为响应返回给客户端。这样客户端就可以通过下载链接获取到文件并保存到本地。
综上所述,Spring Boot提供了简化的文件上传和下载功能,我们可以通过配置和使用MultipartFile类型的参数来实现这些功能。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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基于springboot+vue 实现文件上传和下载代码
由于您没有给出具体的需求,以下是一个基本的文件上传和下载的示例代码:
后端代码(基于Spring Boot):
```
@RestController
public class FileController {
@PostMapping("/upload")
public String uploadFile(@RequestParam("file") MultipartFile file) {
try {
String filename = file.getOriginalFilename();
byte[] bytes = file.getBytes();
Path path = Paths.get("upload/" + filename);
Files.write(path, bytes);
return "File uploaded successfully!";
} catch (IOException e) {
e.printStackTrace();
return "File upload failed!";
}
}
@GetMapping("/download/{filename:.+}")
public ResponseEntity<Resource> downloadFile(@PathVariable String filename) {
try {
Path path = Paths.get("upload/" + filename);
Resource resource = new UrlResource(path.toUri());
return ResponseEntity.ok()
.header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + resource.getFilename() + "\"")
.body(resource);
} catch (MalformedURLException e) {
e.printStackTrace();
return ResponseEntity.notFound().build();
}
}
}
```
前端代码(基于Vue.js):
```
<template>
<div>
<h2>File Upload and Download</h2>
<input type="file" ref="file" @change="handleFileChange">
<button @click="uploadFile">Upload File</button>
<hr>
<ul>
<li v-for="file in files">
{{file}}
<button @click="downloadFile(file)">Download</button>
</li>
</ul>
</div>
</template>
<script>
export default {
data() {
return {
file: null,
files: [],
};
},
methods: {
handleFileChange(event) {
this.file = event.target.files[0];
},
uploadFile() {
let formData = new FormData();
formData.append("file", this.file);
axios.post("/upload", formData).then((response) => {
console.log(response.data);
});
},
downloadFile(filename) {
axios({
url: "/download/" + filename,
method: "GET",
responseType: "blob",
}).then((response) => {
const url = window.URL.createObjectURL(new Blob([response.data]));
const link = document.createElement("a");
link.href = url;
link.setAttribute("download", filename);
document.body.appendChild(link);
link.click();
});
},
},
created() {
axios.get("/list-files").then((response) => {
this.files = response.data;
});
},
};
</script>
```