{"id":2349,"date":"2021-05-06T16:22:59","date_gmt":"2021-05-06T23:22:59","guid":{"rendered":"https:\/\/doubleecpu.com\/?page_id=2349"},"modified":"2022-04-10T22:43:49","modified_gmt":"2022-04-11T05:43:49","slug":"the-go-programming-language","status":"publish","type":"page","link":"https:\/\/doubleecpu.com\/index.php\/the-go-programming-language\/","title":{"rendered":"The Go Programming Language"},"content":{"rendered":"\n

Golang file server<\/h2>\n\n\n\n

Build a simple webserver with a home page, Hello, and a Function
Start by creating a Directory .\\user\\go\\src\\go-server and then open in VSCode<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Add New File main.go
In main.go add code to setup server, The files in the Server will be setup as follows:\u00a0<\/a><\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

In main.go<\/h2>\n\n\n\n

Set up file package and import the libraries: <\/p>\n\n\n\n

package main\nimport (\u200b\n    \"fmt\"\u200b\n    \"log\"\u200b\n    \"net\/http\"\u200b\n)<\/pre>\n\n\n\n
Add Functions<\/h3>\n\n\n\n
Add functions to handleFunc and handle. The handleFunc will process request for hello and form, the handle will process request with no handle<\/p>\n\n\n\n
func formHandler(w http.ResponseWriter, r *http.Request) {\u200b\n    if err := r.ParseForm(); err != nil {\u200b\n        fmt.Fprintf(w, \"ParseForm() err: %v\", err)\u200b\n        return\u200b\n    }\u200b\n    fmt.Fprintf(w, \"POST request successful\")\u200b\n    name := r.FormValue(\"name\")\u200b\n    address := r.FormValue(\"address\")\u200b\n    fmt.Fprintf(w, \"Name = %s\\n\", name)\u200b\n    fmt.Fprintf(w, \"Address = %s\\n\", address)\u200b\n}\u200b\n\n\nfunc helloHandler(w http.ResponseWriter, r *http.Request) {\u200b\n    if r.URL.Path != \"\/hello\" {\u200b\n        http.Error(w, \"404 not found\", http.StatusNotFound)\u200b\n        return\u200b\n    }\u200b\n    if r.Method != \"GET\" {\u200b\n        http.Error(w, \"method is not supported\", http.StatusNotFound)\u200b\n        return\u200b\n    }\u200b\n    fmt.Fprintf(w, \"hello!\")\u200b\n} \n\nfunc main() {\u200b\n    fileserver := http.FileServer(http.Dir(\".\/static\"))\u200b\n    http.Handle(\"\/\", fileserver)\u200b\n    http.HandleFunc(\"\/form\", formHandler)\n    http.HandleFunc(\"\/hello\", helloHandler)\u200b\n    fmt.Printf(\"Starting server at port 8080\\n\")\u200b\n    if err := http.ListenAndServe(\":8080\", nil); err != nil {\u200b\n        log.Fatal(err)\u200b\n    }\u200b\n}<\/pre>\n\n\n\n
Add Website html for serving requests<\/h3>\n\n\n\n
Add New Folder \\static\\ and Add two html files
Static html: will handle request to index.html<\/p>\n\n\n\n
<!DOCTYPE html>\u200b\n<html>\u200b\n    <head>\u200b\n        <title>\u200b\n            Static Website\u200b\n        <\/title>\u200b\n    <\/head>\u200b\n    <body>\u200b\n        <h2>\u200b\n            Static Website\u200b\n        <\/h2>\u200b\n    <\/body<\/pre>\n\n\n\n
form.html: will handle Post Request to form<\/p>\n\n\n\n
<!DOCTYPE html>\u200b\n<html>\u200b\n    <head>\u200b\n        <meta charset=\"UTF-8\"\/>\u200b\n    <\/head>\u200b\n    <body>\u200b\n        <Div>\u200b\n            <form method=\"POST\" action=\"\/form\">\u200b\n            <label>Name<\/label><input name=\"name\" type=\"text\" value=\"\"\/>\u200b\n            <label>Address<\/label><input name=\"address\" type=\"text\" value=\"\"\/>\u200b\n            <input type=\"submit\" value=\"submit\"\/>\u200b\n        <\/Div>\u200b\n    <\/body>\u200b\n<\/html><\/pre>\n\n\n\n
Hello.html will be generated by handleFunc<\/p>\n\n\n\n
Start FileServer <\/h3>\n\n\n\n
on the terminal window type go build to create the binary file to execute
once the binary file is created run the file with go main.go<\/p>\n\n\n\n
View\/Dowload a copy of FilesServer design in PowerPoint<\/p>\n\n\n\n