Golang package to read href,video,title,img ... tags from an HTML page。
一个简单的Golang package 主要用来读取HTML页面中的 <title> ，<video>的src，<a>的href，<img>的src 等元素的内容.
在库里提供了两种方式处理 http.Get 返回的response.Body内容，一是通过 alink.GetBytesReaderWithIoReader方法处理可以读取 http.Get 返回的response.Body内容。
但是如果要多次读取使用io.Reader 要通过 body, err := ioutil.ReadAll(b.Body)读取后再次新建 readerHref := bytes.NewReader(body) 的方式来进行。
第二中就是使用 alink.GetByteWithIoReader 方法读取http.Get 返回的response.Body 使用WithByte后缀的方进行多次读取.
内部方法使用html.Parse 解析后内容。
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一个读取google/baidu主页的例子。获取页面的img和全部a连接并打印出来
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Use http client Get google/baidu Index Page and collect tags img ,href
package main
import (
"github.com/gitgitcode/alink"
"bytes"
"fmt"
"io/ioutil"
"log"
"math/rand"
"net/http"
"time"
)
var userAgentList = []string{"Mozilla/5.0 (compatible, MSIE 10.0, Windows NT, DigExt)",
"Mozilla/4.0 (compatible, MSIE 7.0, Windows NT 5.1, 360SE)",
"Mozilla/4.0 (compatible, MSIE 8.0, Windows NT 6.0, Trident/4.0)",
"Mozilla/5.0 (compatible, MSIE 9.0, Windows NT 6.1, Trident/5.0,",
"Opera/9.80 (Windows NT 6.1, U, en) Presto/2.8.131 Version/11.11",
"Mozilla/4.0 (compatible, MSIE 7.0, Windows NT 5.1, TencentTraveler 4.0)",
"Mozilla/5.0 (Windows, U, Windows NT 6.1, en-us) AppleWebKit/534.50 (KHTML, like Gecko) Version/5.1 Safari/534.50",
"Mozilla/5.0 (Macintosh, Intel Mac OS X 10_7_0) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.56 Safari/535.11",
"Mozilla/5.0 (Macintosh, U, Intel Mac OS X 10_6_8, en-us) AppleWebKit/534.50 (KHTML, like Gecko) Version/5.1 Safari/534.50",
"Mozilla/5.0 (Linux, U, Android 3.0, en-us, Xoom Build/HRI39) AppleWebKit/534.13 (KHTML, like Gecko) Version/4.0 Safari/534.13",
"Mozilla/5.0 (iPad, U, CPU OS 4_3_3 like Mac OS X, en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8J2 Safari/6533.18.5",
"Mozilla/4.0 (compatible, MSIE 7.0, Windows NT 5.1, Trident/4.0, SE 2.X MetaSr 1.0, SE 2.X MetaSr 1.0, .NET CLR 2.0.50727, SE 2.X MetaSr 1.0)",
"Mozilla/5.0 (iPhone, U, CPU iPhone OS 4_3_3 like Mac OS X, en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8J2 Safari/6533.18.5",
"MQQBrowser/26 Mozilla/5.0 (Linux, U, Android 2.3.7, zh-cn, MB200 Build/GRJ22, CyanogenMod-7) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1"}
func GetRandomUserAgent() string{
r := rand.New(rand.NewSource(time.Now().UnixNano()))
return userAgentList[r.Intn(len(userAgentList))]
}
var accept = "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9"
func ReqAdd(req *http.Request) {
req.Header.Set("Cookie","sug=3; a=1; ORIGIN=0; bdime=21110")
req.Header.Add("User-Agent",GetRandomUserAgent() )
req.Header.Add("Accept",accept)
req.Header.Add("Upgrade-Insecure-Requests","1")
}
func main() {
Response ,_:= GetHttpResponseP()
body, err := ioutil.ReadAll(Response.Body)
if err !=nil{
panic(err)
}
GetWithByte(body)
GetWithBytesReaderCreateTwiceNewReader(body)
}
func GetHttpResponseP() (*http.Response,error){
str:="https://google.co.jp"
str1:="https://www.baidu.com"
//fmt.Print(alink.IsValidUrl(str1))
client:= http.Client{Timeout: 2 * time.Second}
req,err := http.NewRequest("GET",str,nil)
req1,err1 := http.NewRequest("GET",str1,nil)
if err != nil{
log.Printf("google is err:%s",err.Error())
}
if err1 != nil{
log.Printf("baidu is err:%s",err1.Error())
}
ReqAdd(req)
ReqAdd(req1)
b,err := client.Do(req)
defer client.CloseIdleConnections()
if err != nil{
log.Printf("request google err %s",err.Error())
b1,err1 := client.Do(req1)
if err1 !=nil{
log.Printf("request baidu err %s",err.Error())
panic(err1)
}
b = b1
}
return b ,nil
}
func GetWithByte(body []byte) {
title, err:= alink.GetTitleWithByte(body)
if err == nil{
fmt.Println(title)
}else{
fmt.Println("GetWithByte GetTitleWithByte err")
}
src,err := alink.GetImgSrcWithByte(body)
if err == nil{
for _,s :=range *src{
fmt.Println(s)
}
}else{
fmt.Println("GetWithByte GetImgSrcWithByte err")
}
}
func GetWithBytesReaderCreateTwiceNewReader(body []byte){
fmt.Println("<=================>")
//for read twice create new reader
readerHref := bytes.NewReader(body)
//创建两个新 reader
readerImg := bytes.NewReader(body)
t,f := alink.GetHrefWithBytesReader (readerImg)
if f !=nil {
log.Print(f)
}
fmt.Printf("Href:%s \n",t)
a,bl := alink.GetImgSrcWithBytesReader(readerHref)
if bl ==nil{
for i,v := range *a{
fmt.Printf("index:%d=href:%s\n",i,v)
}
}
//title:百度一下,你就知道
//index:0=href:/
// index:1=href:javascript:;
// index:2=href:https://passport.baidu.com/v2
//or
//title:Google
//index:0=href:/
// index:1=href:javascript:;
// index:2=href:https://wwww.google.com/
}