如何在Go中高效处理大型JSON文件以避免内存耗尽？

import (
    "encoding/json"
    "fmt"
    "strings"
)

func main() {
    const jsonStream = `
                [
                    {"Name": "Ed", "Text": "Knock knock."},
                    {"Name": "Sam", "Text": "Who's there?"},
                    {"Name": "Ed", "Text": "Go fmt."},
                    {"Name": "Sam", "Text": "Go fmt who?"},
                    {"Name": "Ed", "Text": "Go fmt yourself!"}
                ]
            `
    type Message struct {
        Name, Text string
    }
    dec := json.NewDecoder(strings.NewReader(jsonStream))

    for dec.More() {
        var m Message
        if err := dec.Decode(&m); err != nil {
            fmt.Println(err)
            return
        }
        fmt.Printf("%v: %v\n", m.Name, m.Text)
    }
}