Vue的APP实现下载文件功能，并将文件保存到手机中

- 文字说明
- 后台核心代码
- 前台核心代码
- 运行截图
- 项目链接

文字说明

本文介绍Vue实现的APP，将文件下载并保存到手机中，为系统提供导出功能；同时支持导入，即选择本地的文件后，获取文件内容，并将其上传到服务器中，也可选择对上传的文件内容进行解析，为系统提供导入功能

附带讲解视频，主要实验Vue的5+App的文件上传和下载功能

后台核心代码

后端控制器代码（上传接口）

package com.boot.controller;

import com.boot.entity.Result;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import java.io.InputStream;

/**
 * @author bbyh
 * @date 2024/6/4 22:58
 */
@RestController
@Slf4j
@CrossOrigin(origins = "*", maxAge = 3600)
public class UploadController {
    @PostMapping("/upload")
    public Result upload(@RequestBody MultipartFile file) {
        try {
            InputStream inputStream = file.getInputStream();
            byte[] buf = new byte[inputStream.available()];
            int read = inputStream.read(buf);
            String fileContent = new String(buf, 0, read);
            log.info("文件名称：{}，文件内容：{}", file.getOriginalFilename(), fileContent);
            return Result.success("文件上传成功", fileContent);
        } catch (Exception e) {
            log.error(e.getMessage(), e);
            return Result.error("文件上传接口接口服务出错", null);
        }
    }
}

下载接口

package com.boot.controller;

import com.boot.entity.Result;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletResponse;
import java.io.InputStream;
import java.net.URLEncoder;
import java.nio.file.Files;
import java.nio.file.Paths;

/**
 * @author bbyh
 * @date 2024/6/4 22:45
 */
@RestController
@Slf4j
@CrossOrigin(origins = "*", maxAge = 3600)
public class DownloadController {
    @Value("${file.path}")
    private String filePath;

    @GetMapping("/download/{fileName}")
    public void download(@PathVariable String fileName, HttpServletResponse response) {
        try {
            response.setContentType("application/octet-stream");
            response.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
            try (InputStream inputStream = Files.newInputStream(Paths.get(filePath + fileName))) {
                byte[] buf = new byte[inputStream.available()];
                int read = inputStream.read(buf);
                response.getOutputStream().write(buf, 0, read);
            }
        } catch (Exception e) {
            log.error(e.getMessage(), e);
            response.reset();
            Result.writeResult(response, "文件下载接口接口服务出错，" + e.getMessage());
        }
    }
}

前台核心代码

页面主要代码

<template>
  <div style="display: flex; justify-content: center; align-items: center; height: 100px; width: 100%">
    <el-button type="primary" @click="selectFile()">选择文件上传</el-button>
    <el-button type="danger" @click="openDownloadDialog()">下载文件</el-button>
    <input type="file" style="display: none" @change="uploadFile($event)" ref="uploadFileRef">
  </div>

  <el-dialog title="文件下载" width="60%" v-model="data.dialog">
    <el-input v-model="data.fileName" placeholder="请输入下载文件名"/>
    <template #footer>
      <span class="dialog-footer">
        <el-button @click="data.dialog = false">取消</el-button>
        <el-button type="primary" @click="downloadFile">确认下载</el-button>
      </span>
    </template>
  </el-dialog>
</template>

<script setup>
import {downloadFileToLocal, message, postRequest} from "./util";
import {reactive, ref} from "vue";

function uploadFile(event) {
  if (event.target.files.length === 0) {
    message("warning", "本次未选择文件");
    return;
  }
  const formData = new FormData();
  const file = event.target.files[0];
  formData.append("file", file, file.name);
  postRequest("/upload", formData).then((res) => {
    if (res.data.code === 200) {
      message("success", res.data.data);
    } else if (res.data.code === 500) {
      message("error", res.data.msg);
    }
  });
}

const uploadFileRef = ref();

async function selectFile() {
  uploadFileRef.value.click();
}

const data = reactive({
  fileName: undefined,
  dialog: false,
});

function openDownloadDialog() {
  data.fileName = undefined;
  data.dialog = true;
}

function downloadFile() {
  downloadFileToLocal("/download/" + data.fileName, data.fileName);
}
</script>

<style>
* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}
</style>

工具类代码

import axios from "axios";
import {ElMessage} from "element-plus";

const baseUrl = "http://127.0.0.1:5000";

export const downloadFileToLocal = (href, filename) => {
    const eleLink = document.createElement('a');
    eleLink.download = filename;
    eleLink.style.display = 'none';
    eleLink.href = baseUrl + href;
    document.body.appendChild(eleLink);
    eleLink.click();
    document.body.removeChild(eleLink);
}

export function message(type, msg) {
    ElMessage({
        message: msg,
        type: type,
        center: true,
        showClose: true,
    })
}

export const postRequest = (url, data) => {
    return axios({
        method: 'post',
        url: baseUrl + url,
        data: data,
    })
}