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File upload and download problems and solutions encountered in Vue technology development
Introduction
With the rapid development of the Internet, file upload and download on the Web is becoming more and more common in development. As a commonly used front-end framework, Vue.js not only provides simple and easy-to-use tools, but also has powerful rendering functions and data-driven features. This article will discuss the file upload and download problems encountered in Vue technology development, and provide corresponding solutions and specific code examples.
1. File upload problems and solutions
The sample code is as follows:
<template> <div> <input type="file" v-on:change="onFileChange" accept=".jpg,.jpeg,.png" /> </div> </template> <script> export default { methods: { onFileChange(event) { const file = event.target.files[0]; const extension = file.name.split(".").pop().toLowerCase(); const allowedTypes = ["jpg", "jpeg", "png"]; if (!allowedTypes.includes(extension)) { alert("只能上传jpg、jpeg、png格式的文件!"); return; } // 处理文件上传逻辑... }, }, }; </script>
The sample code is as follows:
<template> <div> <input type="file" v-on:change="onFileChange" /> </div> </template> <script> export default { data() { return { maxFileSize: 5 * 1024 * 1024, // 5MB }; }, methods: { onFileChange(event) { const file = event.target.files[0]; if (file.size > this.maxFileSize) { alert("文件大小不能超过5MB!"); return; } // 处理文件上传逻辑... }, }, }; </script>
The sample code is as follows:
<template> <div> <input type="file" v-on:change="onFileChange" /> <button v-on:click="uploadFile">上传</button> <div>{{ progress }}%</div> </div> </template> <script> import axios from "axios"; export default { data() { return { file: null, progress: 0, }; }, methods: { onFileChange(event) { this.file = event.target.files[0]; }, uploadFile() { const formData = new FormData(); formData.append("file", this.file); axios .post("/upload", formData, { headers: { "Content-Type": "multipart/form-data", }, onUploadProgress: (progressEvent) => { this.progress = Math.round( (progressEvent.loaded / progressEvent.total) * 100 ); }, }) .then((response) => { console.log(response.data); }) .catch((error) => { console.error(error); }); }, }, }; </script>
2. File download problems and solutions
The sample code is as follows:
<template> <div> <button v-on:click="downloadFile">下载</button> </div> </template> <script> export default { methods: { downloadFile() { const fileName = "示例文件.txt"; const fileUrl = "/download?fileName=" + encodeURIComponent(fileName); window.open(fileUrl); }, }, }; </script>
The sample code is as follows:
<template> <div> <button v-on:click="downloadFile">下载</button> </div> </template> <script> export default { methods: { downloadFile() { // 检查用户登录状态和权限... if (userLoggedIn && userHasPermission) { const fileName = "示例文件.txt"; const fileUrl = "/download?fileName=" + encodeURIComponent(fileName); window.open(fileUrl); } else { alert("您没有下载权限!"); } }, }, }; </script>
Conclusion
Through the discussion in this article, we understand the file upload and download problems encountered in the development of Vue technology, and provide corresponding solutions and specific code examples. In actual development, we can flexibly apply these technologies according to specific needs to improve file processing efficiency and user experience. Likewise, we should also pay attention to security and data integrity, protecting user privacy and file security. I hope this article will help everyone with file upload and download problems in Vue technology development.
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