How to configure and use UniApp to implement file downloading and uploading

UniApp realizes the configuration and use of file download and upload

1. Introduction to UniApp
UniApp is a cross-platform application development framework based on Vue.js. It can develop iOS, Android, Applications on multiple platforms such as H5 and mini programs. It has the characteristics of writing once and running on multiple platforms, which greatly improves development efficiency. This article will introduce how to implement file download and upload functions in UniApp, and give relevant configuration and code examples.

2. File download configuration and usage

1. Configure the download domain name whitelist in the manifest.json file
   To download files for UniApp, you need to configure it in the manifest.json file downloadFile domain name whitelist. Relevant configuration instructions can be found in uni-app -> Development Guide -> Local API -> Network -> Setting Whitelist. The following is an example configuration code:

{
  "networkTimeout": {
     "request": 10000,
     "downloadFile": 60000
  },
  "debug": {
    "enabled": true,
    "showReferenceError": true
  },
  "downloadDomain": {
    "default": "https://yourdomain.com"
  }
}

2. Use uni.downloadFile to download files
   On the page where the file is to be downloaded, use uni.downloadFile to download the file. The following is an example code:

// 下载文件
uni.downloadFile({
    url: 'https://yourdomain.com/example.pdf',
    success: function (res) {
        console.log('下载成功');
        console.log('文件路径：' + res.tempFilePath);
    },
    fail: function (res) {
        console.log('下载失败');
    }
});

3. Display download progress
   If you need to display the download progress, you can use uni.onDownloadProgress to monitor the download progress. The following is an example code:

// 下载文件并显示进度
uni.downloadFile({
    url: 'https://yourdomain.com/example.pdf',
    success: function (res) {
        console.log('下载成功');
        console.log('文件路径：' + res.tempFilePath);
    },
    fail: function (res) {
        console.log('下载失败');
    }
});

// 监听下载进度
uni.onDownloadProgress(function (res) {
    console.log('下载进度：' + res.progress + '%');
    console.log('已经下载的数据长度：' + res.totalBytesWritten);
    console.log('预期需要下载的数据总长度：' + res.totalBytesExpectedToWrite);
});

3. File upload configuration and usage

1. Configure the upload domain name whitelist in the manifest.json file
   UniApp requires To upload files, you need to configure the uploadFile domain name whitelist in the manifest.json file. The following is an example configuration code:

{
  "networkTimeout": {
     "request": 10000,
     "uploadFile": 60000
  },
  "debug": {
    "enabled": true,
    "showReferenceError": true
  },
  "uploadDomain": {
    "default": "https://yourdomain.com"
  }
}

2. Use uni.chooseImage to select the file to be uploaded
   On the page where the file is to be uploaded, use uni.chooseImage to select the file to be uploaded. The following is the code for an example:

// 选择要上传的文件
uni.chooseImage({
    success: function (res) {
        console.log('选择文件成功');
        console.log('文件路径：' + res.tempFilePaths[0]);
    },
    fail: function (res) {
        console.log('选择文件失败');
    }
});

3. Use uni.uploadFile for file upload
   Use uni.uploadFile for file upload. The following is an example code:

// 上传文件
uni.uploadFile({
    url: 'https://yourdomain.com/upload',
    filePath: res.tempFilePaths[0],
    name: 'file',
    success: function (res) {
        console.log('上传成功');
        console.log('服务器返回的数据：' + res.data);
    },
    fail: function (res) {
        console.log('上传失败');
    }
});

IV. Summary
This article introduces the configuration and usage of file download and upload in UniApp, and gives relevant code examples. Through the above configuration and code, the file download and upload functions can be easily implemented in UniApp to improve development efficiency. I hope this article can be helpful to UniApp developers.

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