string 如何在 Golang 中替换字符串中的单个字符？
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How to replace a single character inside a string in Golang?
提问by moalf
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.
我正在从用户那里获取物理位置地址，并尝试对其进行安排以创建一个 URL，稍后将使用该 URL 从 Google Geocode API 获取 JSON 响应。
The final URL string result should be similar to this one, without spaces:
最终的 URL 字符串结果应该与这个类似，没有空格：
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:
我不知道如何替换我的 URL 字符串中的空格并用逗号代替。我确实阅读了一些关于字符串和正则表达式包的内容，并创建了以下代码：
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
}
回答by Evan Shaw
You can use strings.Replace.
您可以使用strings.Replace.
package main
import (
"fmt"
"strings"
)
func main() {
str := "a space-separated string"
str = strings.Replace(str, " ", ",", -1)
fmt.Println(str)
}
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:
如果您需要更换不止一件东西，或者您需要一遍又一遍地进行相同的更换，最好使用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)
}
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
当然，如果您出于编码目的而进行替换，例如 URL 编码，那么最好使用专门用于该目的的函数，例如 url.QueryEscape
回答by pcampana
If you need to replace all occurrences of the character in the string, then use strings.ReplaceAll:
如果您需要替换字符串中所有出现的字符，请使用strings.ReplaceAll：
package main
import (
"fmt"
"strings"
)
func main() {
str := "a space-separated string"
str = strings.ReplaceAll(str, " ", ",")
fmt.Println(str)
}
