Vue.js Spring Boot: File Upload, List, Download, and Delete


Here's a detailed guide to implement a file upload, listing, downloading, and deleting functionality using Vue.js as the frontend and Spring Boot as the backend.

Overview:

  1. Backend (Spring Boot):

    • Handle file upload, download, list, and delete functionality.
    • Store files in a database or filesystem (we will use database for this example).

  2. Frontend (Vue.js):

    • Provide UI to upload, list, download, and delete files.

Step 1: Spring Boot Backend

1.1 Create Spring Boot Application

You can use Spring Initializr to create a Spring Boot project with the following dependencies:

  • Spring Web
  • Spring Data JPA (for database integration)
  • H2 Database (for simplicity, you can use other databases like MySQL, PostgreSQL, etc.)
  • Lombok (optional for easier code writing)
  • Spring Boot DevTools (for easier development)

1.2 Backend Project Structure

  1. FileEntity: A model representing the uploaded file.
  2. FileRepository: JPA repository to handle database operations.
  3. FileService: Service class to handle file operations.
  4. FileController: REST controller to expose file operations via HTTP.

1.3 FileEntity Class (Model)

package com.example.fileupload.model;

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Lob;
import java.util.UUID;

@Entity
public class FileEntity {

    @Id
    private String id = UUID.randomUUID().toString();
    private String name;

    @Lob
    private byte[] content;

    // Constructors, getters, and setters
    public FileEntity() {}

    public FileEntity(String name, byte[] content) {
        this.name = name;
        this.content = content;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public byte[] getContent() {
        return content;
    }

    public void setContent(byte[] content) {
        this.content = content;
    }
}

1.4 FileRepository Interface

package com.example.fileupload.repository;

import com.example.fileupload.model.FileEntity;
import org.springframework.data.jpa.repository.JpaRepository;

public interface FileRepository extends JpaRepository<FileEntity, String> {
}

1.5 FileService Class

package com.example.fileupload.service;

import com.example.fileupload.model.FileEntity;
import com.example.fileupload.repository.FileRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;
import java.util.List;
import java.util.Optional;

@Service
public class FileService {

    @Autowired
    private FileRepository fileRepository;

    // Upload a file
    public FileEntity uploadFile(MultipartFile file) throws IOException {
        FileEntity fileEntity = new FileEntity(file.getOriginalFilename(), file.getBytes());
        return fileRepository.save(fileEntity);
    }

    // Get all files
    public List<FileEntity> getAllFiles() {
        return fileRepository.findAll();
    }

    // Get a file by ID
    public Optional<FileEntity> getFileById(String id) {
        return fileRepository.findById(id);
    }

    // Delete a file by ID
    public void deleteFileById(String id) {
        fileRepository.deleteById(id);
    }
}

1.6 FileController Class

package com.example.fileupload.controller;

import com.example.fileupload.model.FileEntity;
import com.example.fileupload.service.FileService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpHeaders;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;
import java.util.List;
import java.util.Optional;

@RestController
@RequestMapping("/api/files")
public class FileController {

    @Autowired
    private FileService fileService;

    // Upload a file
    @PostMapping("/upload")
    public ResponseEntity<FileEntity> uploadFile(@RequestParam("file") MultipartFile file) throws IOException {
        FileEntity uploadedFile = fileService.uploadFile(file);
        return ResponseEntity.ok(uploadedFile);
    }

    // List all files
    @GetMapping
    public List<FileEntity> getAllFiles() {
        return fileService.getAllFiles();
    }

    // Download a file
    @GetMapping("/{id}")
    public ResponseEntity<byte[]> downloadFile(@PathVariable String id) {
        Optional<FileEntity> fileEntityOpt = fileService.getFileById(id);
        if (fileEntityOpt.isPresent()) {
            FileEntity fileEntity = fileEntityOpt.get();
            return ResponseEntity.ok()
                    .header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + fileEntity.getName() + "\"")
                    .body(fileEntity.getContent());
        }
        return ResponseEntity.notFound().build();
    }

    // Delete a file by ID
    @DeleteMapping("/{id}")
    public ResponseEntity<Void> deleteFile(@PathVariable String id) {
        fileService.deleteFileById(id);
        return ResponseEntity.noContent().build();
    }
}

1.7 Application Properties

If you're using H2 as the database, make sure your application.properties file is configured like this:

spring.datasource.url=jdbc:h2:mem:testdb
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.username=sa
spring.datasource.password=password
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
spring.h2.console.enabled=true
spring.jpa.hibernate.ddl-auto=update

1.8 Run Your Spring Boot Application

Run the Spring Boot application. It will be available on http://localhost:8080.

Step 2: Vue.js Frontend

2.1 Set Up Vue.js Project

If you don't have Vue CLI installed, you can install it with the following command:

npm install -g @vue/cli

Create a new Vue project:

vue create file-upload
cd file-upload

2.2 Install Axios

To handle HTTP requests, install Axios:

npm install axios

2.3 Create the Vue Component

In src/components/FileUpload.vue, create the file upload, list, download, and delete functionality.

<template>
  <div>
    <h1>File Upload</h1>

    <!-- Upload Form -->
    <form @submit.prevent="uploadFile">
      <input type="file" @change="onFileChange" />
      <button type="submit" :disabled="!file">Upload</button>
    </form>

    <!-- File List -->
    <h2>Files</h2>
    <ul>
      <li v-for="file in files" :key="file.id">
        {{ file.name }}
        <button @click="downloadFile(file.id)">Download</button>
        <button @click="deleteFile(file.id)">Delete</button>
      </li>
    </ul>
  </div>
</template>

<script>
import axios from "axios";

export default {
  data() {
    return {
      file: null,
      files: []
    };
  },
  methods: {
    // Handle file selection
    onFileChange(event) {
      this.file = event.target.files[0];
    },

    // Upload the file
    async uploadFile() {
      const formData = new FormData();
      formData.append("file", this.file);

      try {
        const response = await axios.post("http://localhost:8080/api/files/upload", formData, {
          headers: {
            "Content-Type": "multipart/form-data"
          }
        });
        console.log("File uploaded successfully", response.data);
        this.fetchFiles();  // Refresh the file list
      } catch (error) {
        console.error("File upload failed", error);
      }
    },

    // Fetch all files
    async fetchFiles() {
      try {
        const response = await axios.get("http://localhost:8080/api/files");
        this.files = response.data;
      } catch (error) {
        console.error("Error fetching files", error);
      }
    },

    // Download a file by ID
    async downloadFile(fileId) {
      try {
        const response = await axios.get(`http://localhost:8080/api/files/${fileId}`, {
          responseType: "blob"
        });
        const url = window.URL.createObjectURL(new Blob([response.data]));
        const link = document.createElement("a");
        link.href = url;
        link.setAttribute("download", fileId); // You can add file name here
        document.body.appendChild(link);
        link.click();
      } catch (error) {
        console.error("Error downloading file", error);
      }
    },

    // Delete a file by ID
    async deleteFile(fileId) {
      try {
        await axios.delete(`http://localhost:8080/api/files/${fileId}`);
        this.fetchFiles();  // Refresh the file list
      } catch (error) {
        console.error("Error deleting file", error);
      }
    }
  },
  created() {
    this.fetchFiles();  // Fetch files when component is created
  }
};
</script>

<style scoped>
/* Add any styling here */
</style>

2.4 Run the Vue Application

Run your Vue.js application:

npm run serve

It will be available at http://localhost:8081.

Step 3: Test the Application

  1. Upload a file: Choose a file from your local machine and upload it.
  2. List files: The list of uploaded files will appear on the page.
  3. Download a file: Click the "Download" button next to a file to download it.
  4. Delete a file: Click the "Delete" button next to a file to remove it from the server.

Step 4: Conclusion

This guide shows how to create a full-stack application with Vue.js for the frontend and Spring Boot for the backend. You can extend this functionality by adding file size limits, user authentication, error handling, and more.

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