How to upload files and change file encoding in Vue

With the continuous development of front-end technology, more and more websites use the Vue framework for development. In Vue, it is often necessary to implement the file upload function. However, if the uploaded file has encoding problems, it will seriously affect the readability and operability of the file. This article will introduce how to upload files and change file encoding in Vue.

1. Basic knowledge of uploading files

In the development model where the front and back ends are separated, the front end needs to upload files to the back end through the interface. There are two common upload methods:

1. Form upload

Submit files to the server through HTML forms. The front-end operation is very simple. Just put the files into the form and submit. That’s it. However, this method will cause the page to refresh, which is unfriendly.

2. Use ajax to upload

Asynchronously submit files to the server through ajax. Since it will not cause the page to be refreshed, the effect is better. At the same time, when uploading files through ajax, the progress bar function can be implemented to improve the user's interactive experience.

2. File Encoding

When uploading files, we often encounter file encoding problems, resulting in files that cannot be read or parsed. Therefore, the uploaded file needs to be encoded.

There are two common file encoding methods:

1. Binary file

By transmitting files as binary streams, problems caused by file encoding can be avoided. However, this method consumes more bandwidth and has slower upload speed.

2. Text file

By converting the file into Base64 encoding format for transmission, you can avoid file encoding problems and facilitate data transmission between the client and the server. However, the file size transferred in this way is relatively large, and Base64 encoding and decoding also consumes time and bandwidth.

3. Upload files and change the encoding

In Vue, you can upload files through the Vue-resource plug-in. When using Vue-resource to upload files, the files need to be encoded to avoid problems caused by file encoding. The code is as follows:

uploadFile(file) {
      const formData = new FormData();
      //将上传的文件进行base64编码
      formData.append("file", window.btoa(file));
      //上传文件
      this.$http
        .post("/api/upload", formData)
        .then(res => {
          console.log(res);
        })
        .catch(err => {
          console.log(err);
        });
    }

In the above code, the file is Base64 encoded through the window.btoa method, and the encoded file is placed into FormData. Then, upload the FormData to the server through a POST request. After the server receives the data, it also needs to decode the data. The code is as follows:

const file = req.body.file;
//将上传的文件进行Base64解码
const result = window.atob(file);

Through the above code, the uploaded file can be conveniently processed between the client and the server after being encoded and decoded. Data transmission, and avoids problems caused by file encoding.

4. Summary

Uploading files and changing the encoding in Vue can be achieved through the Vue-resource plug-in. Encoding is required when uploading files to avoid problems caused by file encoding. At the same time, after the server receives the data, it also needs to decode the data. Through the above code, file uploading and encoding processing can be easily realized, improving user experience and operating efficiency.

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