Golang处理Web文件流的技巧分享

func serveFile(w http.ResponseWriter, r *http.Request) {
    file, err := os.Open("large-file.zip")
    if err != nil {
        http.Error(w, "File not found", http.StatusNotFound)
        return
    }
    defer file.Close()
<pre class="brush:php;toolbar:false;">w.Header().Set("Content-Type", "application/octet-stream")
w.Header().Set("Content-Disposition", `attachment; filename="large-file.zip"`)

// 流式写入响应体
io.Copy(w, file)

}

func serveFileWithBuffer(w http.ResponseWriter, r *http.Request) {
    file, err := os.Open("large-file.zip")
    if err != nil {
        http.Error(w, "File not found", http.StatusNotFound)
        return
    }
    defer file.Close()
<pre class="brush:php;toolbar:false;">w.Header().Set("Content-Type", "application/octet-stream")
bufferedFile := bufio.NewReader(file)
// 设置64KB缓冲
buf := make([]byte, 64*1024)
io.CopyBuffer(w, bufferedFile, buf)

}

func serveRangeRequest(w http.ResponseWriter, r *http.Request) {
    file, err := os.Open("large-file.zip")
    if err != nil {
        http.Error(w, "File not found", http.StatusNotFound)
        return
    }
    defer file.Close()
<pre class="brush:php;toolbar:false;">info, _ := file.Stat()
http.ServeContent(w, r, "large-file.zip", info.ModTime(), file)

}

server := &http.Server{
    Addr:         ":8080",
    ReadTimeout:  30 * time.Second,
    WriteTimeout: 60 * time.Second,
}