如何在Golang中替换字符串中的单个字符？ [英] How to replace a single character inside a string in Golang?

问题描述

我正在从用户那里获得一个物理位置地址，并试图安排它来创建一个URL，该URL以后将用于从Google Geocode API获取JSON响应。

I am getting a physical location address from a user and trying to arrange it to create a URL that would use later to get a JSON response from Google Geocode API.

最终的URL字符串结果应类似于这一个，不带空格：

The final URL string result should be similar to this one, without spaces:

http://maps.googleapis.com/maps/api/geocode/json?address=1600+Amphitheatre+Parkway，+山+ View，+ CA& sensor = true

我不知道如何替换URL字符串中的空格，并且逗号代替。我确实阅读了一些有关字符串和正则表达式包的信息，并创建了以下代码：

I do not know how to replace white spaces in my URL string and have commas instead. I did read a little about the strings and regexp packages and I have created the following code:

package main

import (
    "fmt"
    "bufio"
    "os"
    "http"
)

func main() {
    // Get the physical address
    r := bufio.NewReader(os.Stdin)  
    fmt.Println("Enter a physical location address: ")
    line, _, _ := r.ReadLine()

    // Print the inputted address
    address := string(line)
    fmt.Println(address) // Need to see what I'm getting

    // Create the URL and get Google's Geocode API JSON response for that address
    URL := "http://maps.googleapis.com/maps/api/geocode/json?address=" + address + "&sensor=true"
    fmt.Println(URL)

    result, _ := http.Get(URL)
    fmt.Println(result) // To see what I'm getting at this point
}

推荐答案

您可以e strings.Replace 。

You can use strings.Replace.

package main

import (
    "fmt"
    "strings"
)

func main() {
    str := "a space-separated string"
    str = strings.Replace(str, " ", ",", -1)
    fmt.Println(str)
}

如果需要替换不止一件事情，或者您需要一遍又一遍地进行相同的替换，使用 strings.Replacer ：

If you need to replace more than one thing, or you'll need to do the same replacement over and over, it might be better to use a strings.Replacer:

package main

import (
    "fmt"
    "strings"
)

// replacer replaces spaces with commas and tabs with commas.
// It's a package-level variable so we can easily reuse it, but
// this program doesn't take advantage of that fact.
var replacer = strings.NewReplacer(" ", ",", "\t", ",")

func main() {
    str := "a space- and\ttab-separated string"
    str = replacer.Replace(str)
    fmt.Println(str)
}

当然，如果您出于编码目的而替换，例如URL编码，那么最好使用专门用于该目的的函数，例如为 url.QueryEscape

And of course if you're replacing for the purpose of encoding, such as URL encoding, then it might be better to use a function specifically for that purpose, such as url.QueryEscape

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