json - 更新 1.1 在文件夹中运行 Go 文件和 JSON 文件时出现问题

标签 json go directory fileserver

更新 1.1

在收到有关更改处理程序路径的有用反馈后，我在我的应用程序中使用了该反馈，但奇怪的是，我仍然收到一些错误反馈。我正在尝试自己弄清楚，但我想我可以与大家分享。这也是我取消现在给出的答案的原因。还有一些答案现在让我感到困惑，无法理解这将如何为我工作。 

package main

import (

    "net/http" // Package http provides HTTP client and server implementations.



)

func main(){
    webHost()

}


func webHost(){
    // Ik heb hier later nog een mapje voor de html pagina's toegevoegd. 
    http.Handle("/go", http.FileServer(http.Dir("./1_Go_Files"))) 
    http.Handle("/html", http.FileServer(http.Dir("./2_Html_Pages"))) 
    http.Handle("/storage", http.FileServer(http.Dir("./3_Json_Storage"))) 
    // -----------------------------------------------------------------

    http.HandleFunc("/homepage", Homehandler) 
    http.HandleFunc("/selectiepagina", Selectiehandler) 
    http.HandleFunc("/userinputpagina", Userinputhandler) 
    http.HandleFunc("/bestelnrpagina", Bestelnrhandler)
    http.HandleFunc("/statuspagina", Statushandler)  




    //FileServer returns a handler that serves HTTP requests with the contents of the file system rooted at root..

    http.Handle("/4_Css_Styling/", http.StripPrefix("/4_Css_Styling/", http.FileServer(http.Dir("css")))) // css styling map.
    http.Handle("/5_Pizza_Img/", http.StripPrefix("/5_Pizza_Img/", http.FileServer(http.Dir("img")))) // image mapje.


}

所以这里出现了新的 panic (对不起，文字墙，我不确定要遗漏什么，所以我只是复制粘贴这里的所有内容:

   2018/11/12 10:07:11 http: panic serving [::1]:58084: runtime error: invalid memory address or nil pointer dereference
    goroutine 4 [running]:
    net/http.(*conn).serve.func1(0xc0000de000)
            C:/tools/go/src/net/http/server.go:1746 +0xd7
    panic(0x73a9c0, 0xa34b30)
            C:/tools/go/src/runtime/panic.go:513 +0x1c7
    html/template.(*Template).escape(0x0, 0x0, 0x0)
            C:/tools/go/src/html/template/template.go:95 +0x35
    html/template.(*Template).Execute(0x0, 0x7f7580, 0xc0001160e0, 0x71ac40, 0x7f5300, 0xc000106120, 0x3)
            C:/tools/go/src/html/template/template.go:119 +0x36
    main.Homehandler(0x7f9f60, 0xc0001160e0, 0xc000124000)
            C:/Users/Taavetti/Documents/Go/Sources/src/Projects/VillaBrutus_Main/1_Go_Files/0_Homepagina.go:14 +0xc8
    net/http.HandlerFunc.ServeHTTP(0x7b3ca8, 0x7f9f60, 0xc0001160e0, 0xc000124000)
            C:/tools/go/src/net/http/server.go:1964 +0x4b
    net/http.(*ServeMux).ServeHTTP(0xa438e0, 0x7f9f60, 0xc0001160e0, 0xc000124000)
            C:/tools/go/src/net/http/server.go:2361 +0x12e
    net/http.serverHandler.ServeHTTP(0xc00004b040, 0x7f9f60, 0xc0001160e0, 0xc000124000)
            C:/tools/go/src/net/http/server.go:2741 +0xb2
    net/http.(*conn).serve(0xc0000de000, 0x7fa120, 0xc0000320c0)
            C:/tools/go/src/net/http/server.go:1847 +0x64d
    created by net/http.(*Server).Serve
            C:/tools/go/src/net/http/server.go:2851 +0x2fc
    2018/11/12 10:07:11 http: panic serving [::1]:58087: runtime error: invalid memory address or nil pointer dereference
    goroutine 19 [running]:
    net/http.(*conn).serve.func1(0xc00004cf00)
            C:/tools/go/src/net/http/server.go:1746 +0xd7
    panic(0x73a9c0, 0xa34b30)
            C:/tools/go/src/runtime/panic.go:513 +0x1c7
    html/template.(*Template).escape(0x0, 0x0, 0x0)
            C:/tools/go/src/html/template/template.go:95 +0x35
    html/template.(*Template).Execute(0x0, 0x7f7580, 0xc0001161c0, 0x71ac40, 0x7f5300, 0xc0001061e0, 0x3)
            C:/tools/go/src/html/template/template.go:119 +0x36
    main.Homehandler(0x7f9f60, 0xc0001161c0, 0xc000126000)
            C:/Users/Taavetti/Documents/Go/Sources/src/Projects/VillaBrutus_Main/1_Go_Files/0_Homepagina.go:14 +0xc8
    net/http.HandlerFunc.ServeHTTP(0x7b3ca8, 0x7f9f60, 0xc0001161c0, 0xc000126000)
            C:/tools/go/src/net/http/server.go:1964 +0x4b
    net/http.(*ServeMux).ServeHTTP(0xa438e0, 0x7f9f60, 0xc0001161c0, 0xc000126000)
            C:/tools/go/src/net/http/server.go:2361 +0x12e
    net/http.serverHandler.ServeHTTP(0xc00004b040, 0x7f9f60, 0xc0001161c0, 0xc000126000)
            C:/tools/go/src/net/http/server.go:2741 +0xb2
    net/http.(*conn).serve(0xc00004cf00, 0x7fa120, 0xc00004e240)
            C:/tools/go/src/net/http/server.go:1847 +0x64d
    created by net/http.(*Server).Serve
            C:/tools/go/src/net/http/server.go:2851 +0x2fc
    2018/11/12 10:07:11 http: panic serving [::1]:58088: runtime error: invalid memory address or nil pointer dereference
    goroutine 37 [running]:
    net/http.(*conn).serve.func1(0xc000172000)
            C:/tools/go/src/net/http/server.go:1746 +0xd7
    panic(0x73a9c0, 0xa34b30)
            C:/tools/go/src/runtime/panic.go:513 +0x1c7
    html/template.(*Template).escape(0x0, 0x0, 0x0)
            C:/tools/go/src/html/template/template.go:95 +0x35
    html/template.(*Template).Execute(0x0, 0x7f7580, 0xc0001162a0, 0x71ac40, 0x7f5300, 0xc000106360, 0x3)
            C:/tools/go/src/html/template/template.go:119 +0x36
    main.Homehandler(0x7f9f60, 0xc0001162a0, 0xc000124100)
            C:/Users/Taavetti/Documents/Go/Sources/src/Projects/VillaBrutus_Main/1_Go_Files/0_Homepagina.go:14 +0xc8
    net/http.HandlerFunc.ServeHTTP(0x7b3ca8, 0x7f9f60, 0xc0001162a0, 0xc000124100)
            C:/tools/go/src/net/http/server.go:1964 +0x4b
    net/http.(*ServeMux).ServeHTTP(0xa438e0, 0x7f9f60, 0xc0001162a0, 0xc000124100)
            C:/tools/go/src/net/http/server.go:2361 +0x12e
    net/http.serverHandler.ServeHTTP(0xc00004b040, 0x7f9f60, 0xc0001162a0, 0xc000124100)
            C:/tools/go/src/net/http/server.go:2741 +0xb2
    net/http.(*conn).serve(0xc000172000, 0x7fa120, 0xc000110240)
            C:/tools/go/src/net/http/server.go:1847 +0x64d
    created by net/http.(*Server).Serve
            C:/tools/go/src/net/http/server.go:2851 +0x2fc
    2018/11/12 10:07:11 http: panic serving [::1]:58089: runtime error: invalid memory address or nil pointer dereference
    goroutine 39 [running]:
    net/http.(*conn).serve.func1(0xc0001720a0)
            C:/tools/go/src/net/http/server.go:1746 +0xd7
    panic(0x73a9c0, 0xa34b30)
            C:/tools/go/src/runtime/panic.go:513 +0x1c7
    html/template.(*Template).escape(0x0, 0x0, 0x0)
            C:/tools/go/src/html/template/template.go:95 +0x35
    html/template.(*Template).Execute(0x0, 0x7f7580, 0xc000116380, 0x71ac40, 0x7f5300, 0xc0001064e0, 0x3)
            C:/tools/go/src/html/template/template.go:119 +0x36
    main.Homehandler(0x7f9f60, 0xc000116380, 0xc000124200)
            C:/Users/Taavetti/Documents/Go/Sources/src/Projects/VillaBrutus_Main/1_Go_Files/0_Homepagina.go:14 +0xc8
    net/http.HandlerFunc.ServeHTTP(0x7b3ca8, 0x7f9f60, 0xc000116380, 0xc000124200)
            C:/tools/go/src/net/http/server.go:1964 +0x4b
    net/http.(*ServeMux).ServeHTTP(0xa438e0, 0x7f9f60, 0xc000116380, 0xc000124200)
            C:/tools/go/src/net/http/server.go:2361 +0x12e
    net/http.serverHandler.ServeHTTP(0xc00004b040, 0x7f9f60, 0xc000116380, 0xc000124200)
            C:/tools/go/src/net/http/server.go:2741 +0xb2
    net/http.(*conn).serve(0xc0001720a0, 0x7fa120, 0xc000110340)
            C:/tools/go/src/net/http/server.go:1847 +0x64d
    created by net/http.(*Server).Serve
            C:/tools/go/src/net/http/server.go:2851 +0x2fc
    2018/11/12 10:07:12 http: panic serving [::1]:58090: runtime error: invalid memory address or nil pointer dereference
    goroutine 20 [running]:
    net/http.(*conn).serve.func1(0xc00004cfa0)
            C:/tools/go/src/net/http/server.go:1746 +0xd7
    panic(0x73a9c0, 0xa34b30)
            C:/tools/go/src/runtime/panic.go:513 +0x1c7
    html/template.(*Template).escape(0x0, 0x0, 0x0)
            C:/tools/go/src/html/template/template.go:95 +0x35
    html/template.(*Template).Execute(0x0, 0x7f7580, 0xc000116460, 0x71ac40, 0x7f5300, 0xc000106660, 0x3)
            C:/tools/go/src/html/template/template.go:119 +0x36
    main.Homehandler(0x7f9f60, 0xc000116460, 0xc000126100)
            C:/Users/Taavetti/Documents/Go/Sources/src/Projects/VillaBrutus_Main/1_Go_Files/0_Homepagina.go:14 +0xc8
    net/http.HandlerFunc.ServeHTTP(0x7b3ca8, 0x7f9f60, 0xc000116460, 0xc000126100)
            C:/tools/go/src/net/http/server.go:1964 +0x4b
    net/http.(*ServeMux).ServeHTTP(0xa438e0, 0x7f9f60, 0xc000116460, 0xc000126100)
            C:/tools/go/src/net/http/server.go:2361 +0x12e
    net/http.serverHandler.ServeHTTP(0xc00004b040, 0x7f9f60, 0xc000116460, 0xc000126100)
            C:/tools/go/src/net/http/server.go:2741 +0xb2
    net/http.(*conn).serve(0xc00004cfa0, 0x7fa120, 0xc00004e2c0)
            C:/tools/go/src/net/http/server.go:1847 +0x64d
    created by net/http.(*Server).Serve
            C:/tools/go/src/net/http/server.go:2851 +0x2fc
    2018/11/12 10:07:12 http: panic serving [::1]:58091: runtime error: invalid memory address or nil pointer dereference
    goroutine 41 [running]:
    net/http.(*conn).serve.func1(0xc000172140)
            C:/tools/go/src/net/http/server.go:1746 +0xd7
    panic(0x73a9c0, 0xa34b30)
            C:/tools/go/src/runtime/panic.go:513 +0x1c7
    html/template.(*Template).escape(0x0, 0x0, 0x0)
            C:/tools/go/src/html/template/template.go:95 +0x35
    html/template.(*Template).Execute(0x0, 0x7f7580, 0xc0001cc000, 0x71ac40, 0x7f5300, 0xc000067290, 0x3)
            C:/tools/go/src/html/template/template.go:119 +0x36
    main.Homehandler(0x7f9f60, 0xc0001cc000, 0xc000124300)
            C:/Users/Taavetti/Documents/Go/Sources/src/Projects/VillaBrutus_Main/1_Go_Files/0_Homepagina.go:14 +0xc8
    net/http.HandlerFunc.ServeHTTP(0x7b3ca8, 0x7f9f60, 0xc0001cc000, 0xc000124300)
            C:/tools/go/src/net/http/server.go:1964 +0x4b
    net/http.(*ServeMux).ServeHTTP(0xa438e0, 0x7f9f60, 0xc0001cc000, 0xc000124300)
            C:/tools/go/src/net/http/server.go:2361 +0x12e
    net/http.serverHandler.ServeHTTP(0xc00004b040, 0x7f9f60, 0xc0001cc000, 0xc000124300)
            C:/tools/go/src/net/http/server.go:2741 +0xb2
    net/http.(*conn).serve(0xc000172140, 0x7fa120, 0xc000110440)
            C:/tools/go/src/net/http/server.go:1847 +0x64d
    created by net/http.(*Server).Serve
            C:/tools/go/src/net/http/server.go:2851 +0x2fc
    2018/11/12 10:07:12 http: panic serving [::1]:58092: runtime error: invalid memory address or nil pointer dereference
    goroutine 22 [running]:
    net/http.(*conn).serve.func1(0xc00004d040)
            C:/tools/go/src/net/http/server.go:1746 +0xd7
    panic(0x73a9c0, 0xa34b30)
            C:/tools/go/src/runtime/panic.go:513 +0x1c7
    html/template.(*Template).escape(0x0, 0x0, 0x0)
            C:/tools/go/src/html/template/template.go:95 +0x35
    html/template.(*Template).Execute(0x0, 0x7f7580, 0xc0001cc0e0, 0x71ac40, 0x7f5300, 0xc000067410, 0x3)
            C:/tools/go/src/html/template/template.go:119 +0x36
    main.Homehandler(0x7f9f60, 0xc0001cc0e0, 0xc000126200)
            C:/Users/Taavetti/Documents/Go/Sources/src/Projects/VillaBrutus_Main/1_Go_Files/0_Homepagina.go:14 +0xc8
    net/http.HandlerFunc.ServeHTTP(0x7b3ca8, 0x7f9f60, 0xc0001cc0e0, 0xc000126200)
            C:/tools/go/src/net/http/server.go:1964 +0x4b
    net/http.(*ServeMux).ServeHTTP(0xa438e0, 0x7f9f60, 0xc0001cc0e0, 0xc000126200)
            C:/tools/go/src/net/http/server.go:2361 +0x12e
    net/http.serverHandler.ServeHTTP(0xc00004b040, 0x7f9f60, 0xc0001cc0e0, 0xc000126200)
            C:/tools/go/src/net/http/server.go:2741 +0xb2
    net/http.(*conn).serve(0xc00004d040, 0x7fa120, 0xc00004e3c0)
            C:/tools/go/src/net/http/server.go:1847 +0x64d
    created by net/http.(*Server).Serve
            C:/tools/go/src/net/http/server.go:2851 +0x2fc

同样，我仍在尝试自己解决这个问题，因为我想表明我也在为此付出努力，而不仅仅是试图从您那里得到所有答案。但如果你能帮助我朝着正确的方向前进，那将会很有帮助。

(同样，我是新用户，如果我违反了此线程中的某些规则，请在您否决此威胁后通知我，我真的很喜欢 stackoverflow，我正在尝试了解这个社区的运作方式。)

VillaBrutus_Main.zip

(添加了我当前的应用程序，包括错误，也许这有帮助？，请注意有一些荷兰语评论)

最佳答案

您已为 / 分配了多个处理程序。 看你的代码两次:

func webHost(){
    http.Handle("/", 
    http.FileServer(http.Dir("./html_paginas"))) 
    http.Handle("/", http.FileServer(http.Dir("./go_files"))) 
    http.Handle("/", http.FileServer(http.Dir("./storage")))
    //...
}

所以 http 必须在这种情况下 panic 。因此，对此的修复是:

func webHost(){
    http.Handle("/html", 
    http.FileServer(http.Dir("./html_paginas"))) 
    http.Handle("/go", http.FileServer(http.Dir("./go_files"))) 
    http.Handle("/storage", 
    http.FileServer(http.Dir("./storage")))
    //...
}

或者:

func webHost(){
    http.Handle("/", http.FileServer(http.Dir("./root"))) 
    //...
}

现在将您的 html，go，存储目录移动到 root 目录。

关于json - 更新 1.1 在文件夹中运行 Go 文件和 JSON 文件时出现问题，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/53223002/

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