string Golang 将字符串转换为 io.Writer？
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Golang Convert String to io.Writer?
提问by Acidic9
Is it possible to convert a stringto an io.Writertype in Golang?
是否可以将 a 转换为Golang 中string的io.Writer类型？
I will be using this string in fmt.Fprintf()but I am unable to convert the type.
我将使用这个字符串，fmt.Fprintf()但我无法转换类型。
回答by icza
You can't write into a string, strings in Go are immutable.
你不能写入 a string，stringGo 中的 s 是不可变的。
The best alternatives are the bytes.Bufferand since Go 1.10 the faster strings.Buildertypes: they implement io.Writerso you can write into them, and you can obtain their content as a stringwith Buffer.String()and Builder.String(), or as a byte slice with Buffer.Bytes().
最好的选择是bytes.Buffer和自走1.10较快的strings.Builder类型：他们实施io.Writer这样你就可以写放进去，你可以得到他们的内容作为string与Buffer.String()和Builder.String()，或作为与字节片Buffer.Bytes()。
You can also have a stringas the initial content of the buffer if you create the buffer with bytes.NewBufferString():
string如果您使用以下命令创建缓冲区，您还可以将 a作为缓冲区的初始内容bytes.NewBufferString()：
s := "Hello"
buf := bytes.NewBufferString(s)
fmt.Fprint(buf, ", World!")
fmt.Println(buf.String())
Output (try it on the Go Playground):
输出（在Go Playground上试试）：
Hello, World!
If you want to append a variable of type string(or any value of stringtype), you can simply use Buffer.WriteString()(or Builder.WriteString()):
如果你想附加一个类型的变量string（或任何string类型的值），你可以简单地使用Buffer.WriteString()（或Builder.WriteString()）：
s2 := "to be appended"
buf.WriteString(s2)
Or:
或者：
fmt.Fprint(buf, s2)
Also note that if you just want to concatenate 2 strings, you don't need to create a buffer and use fmt.Fprintf(), you can simply use the +operator to concatenate them:
另请注意，如果您只想连接 2 strings，则不需要创建缓冲区并使用fmt.Fprintf()，您只需使用+运算符将它们连接起来即可：
s := "Hello"
s2 := ", World!"
s3 := s + s2 // "Hello, World!"
Also see: Golang: format a string without printing?
另请参阅：Golang：格式化字符串而不打印？
It may also be of interest: What's the difference between ResponseWriter.Write and io.WriteString?
回答by Sidharth J
Use bytes.Bufferwhich implements the Write()method.
使用bytes.Buffer实现Write()方法。
import "bytes"
writer := bytes.NewBufferString("your string")
