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Go语言拼接URL路径有多种方法建议用ResolveReference。

JoinPath

JoinPath会把多个多个路径合并成一个路径，并且处理../和./，多个//合并成单个/。

package main

import (
    "fmt"
    "net/url"
)

func main() {
    u1 := "http://example.com/directory/"
    u2 := "../../..//search?q=dotnet"
    u3 := "/dir1/dir2/search?q=dotnet"

    j1, _ := url.JoinPath(u1, u2)
    j2, _ := url.JoinPath(u1, u3)
    fmt.Println(j1)
    // http://example.com/search%3Fq=dotnet
    fmt.Println(j2)
    // http://example.com/directory/dir1/dir2/search%3Fq=dotnet
}

ResolveReference

ResolveReference会处理绝对路径和相对路径。

package main

import (
    "fmt"
    "log"
    "net/url"
)

func main() {
    u1, _ := url.Parse("../../..//search?q=dotnet")
    u2, _ := url.Parse("/dir1/dir2/search?q=dotnet")
    base, err := url.Parse("http://example.com/directory/")
    if err != nil {
        log.Fatal(err)
    }
    fmt.Println(base.ResolveReference(u1))
    // http://example.com/search?q=dotnet
    fmt.Println(base.ResolveReference(u2))
    // http://example.com/dir1/dir2/search?q=dotnet
}

path.Join

path主要是对斜杠放个的路径。

package main

import (
    "fmt"
    "log"
    "net/url"
    "path"
)

func main() {
    u, err := url.Parse("http://example.com/test/")
    if err != nil {
        log.Fatal(err)
    }
    u.Path = path.Join(u.Path, "../bar.html")
    s := u.String()
    fmt.Println(s) // http://example.com/bar.html

}