golang 文件流转发

....占位

copy from

https://www.jianshu.com/p/10c857270947

https://www.jianshu.com/p/55b0b8126e40?utm_campaign=studygolang.com&utm_medium=studygolang.com&utm_source=studygolang.com

https://www.codercto.com/a/48060.html

 1 // dataServer.go
 2 package main
 3  
 4 import (
 5     "io"
 6     "log"
 7     "net/http"
 8     "os"
 9     "strings"
10 )
11  
12 const objectDir = "./objects/"
13  
14 var (
15     url = "http://1.1.13.10:9800/huzh1310.txt"
16 )
17  
18 func Handler(w http.ResponseWriter, r *http.Request) {
19     m := r.Method
20     if m == http.MethodGet {
21         get(w, r)
22         return
23     }
24     w.WriteHeader(http.StatusMethodNotAllowed)
25     w.Header().Set("content-disposition", "attachment;filename=aa.txt")
26 }
27  
28 func get(w http.ResponseWriter, r *http.Request) {
29     // 收到 接口服务器的 请求
30     // 提取 要获取的文件名
31     name := strings.Split(r.URL.EscapedPath(), "/")[2]
32     f, e := os.Open(objectDir + name)
33     if e != nil {
34         log.Println(e)
35         w.WriteHeader(http.StatusNotFound)
36         return
37     }
38     defer f.Close()
39     res, err := http.Get(url)
40     if err != nil {
41         panic(err)
42     }
43     // 真正读取，并发送
44  
45     //文件流写入
46     //io.Copy(w, f)
47  
48     //http 流写入
49     io.Copy(w, res.Body)
50 }
51  
52 func getURL() {
53     res, err := http.Get(url)
54     if err != nil {
55         panic(err)
56     }
57     f, err := os.Create("huzh1310_local.txt")
58     if err != nil {
59         panic(err)
60     }
61     io.Copy(f, res.Body)
62 }
63  
64 func main() {
65     http.HandleFunc("/objects/", Handler)
66     http.ListenAndServe(":8889", nil)
67     getURL()
68  
69 }

// dataServer.go
package main

import (
	"io"
	"log"
	"net/http"
	"os"
	"strings"
)

const objectDir = "./objects/"

var (
	url = "http://1.1.13.10:9800/huzh1310.txt"
)

func Handler(w http.ResponseWriter, r *http.Request) {
	m := r.Method
	if m == http.MethodGet {
		get(w, r)
		return
	}
	w.WriteHeader(http.StatusMethodNotAllowed)
	w.Header().Set("content-disposition", "attachment;filename=aa.txt")
}

func get(w http.ResponseWriter, r *http.Request) {
	// 收到 接口服务器的 请求
	// 提取 要获取的文件名
	name := strings.Split(r.URL.EscapedPath(), "/")[2]
	f, e := os.Open(objectDir + name)
	if e != nil {
		log.Println(e)
		w.WriteHeader(http.StatusNotFound)
		return
	}
	defer f.Close()
	res, err := http.Get(url)
	if err != nil {
		panic(err)
	}
	// 真正读取，并发送

	//文件流写入
	//io.Copy(w, f)

	//http 流写入
	io.Copy(w, res.Body)
}

func getURL() {
	res, err := http.Get(url)
	if err != nil {
		panic(err)
	}
	f, err := os.Create("huzh1310_local.txt")
	if err != nil {
		panic(err)
	}
	io.Copy(f, res.Body)
}

func main() {
	http.HandleFunc("/objects/", Handler)
	http.ListenAndServe(":8889", nil)
	getURL()

}

　待补充, golang http response header