github.com/riscv/riscv-go@v0.0.0-20200123204226-124ebd6fcc8e/doc/articles/wiki/part2.go (about)

     1  // Copyright 2010 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package main
     6  
     7  import (
     8  	"fmt"
     9  	"io/ioutil"
    10  	"net/http"
    11  )
    12  
    13  type Page struct {
    14  	Title string
    15  	Body  []byte
    16  }
    17  
    18  func (p *Page) save() error {
    19  	filename := p.Title + ".txt"
    20  	return ioutil.WriteFile(filename, p.Body, 0600)
    21  }
    22  
    23  func loadPage(title string) (*Page, error) {
    24  	filename := title + ".txt"
    25  	body, err := ioutil.ReadFile(filename)
    26  	if err != nil {
    27  		return nil, err
    28  	}
    29  	return &Page{Title: title, Body: body}, nil
    30  }
    31  
    32  func viewHandler(w http.ResponseWriter, r *http.Request) {
    33  	title := r.URL.Path[len("/view/"):]
    34  	p, _ := loadPage(title)
    35  	fmt.Fprintf(w, "<h1>%s</h1><div>%s</div>", p.Title, p.Body)
    36  }
    37  
    38  func main() {
    39  	http.HandleFunc("/view/", viewHandler)
    40  	http.ListenAndServe(":8080", nil)
    41  }