Go语言并发爬虫的具体实现

var Client http.Client

func main() {
	url := "http://localhost:3000/api/v1/products"
	start := time.Now()
	for i := 0; i < 10; i++ {
		Spider(url, i)
	}
	elapsed := time.Since(start)
	fmt.Printf("Time %s", elapsed)
}

func Spider(url string, i int) {
	reqSpider, err := http.NewRequest("GET", url, nil)
	if err != nil {
		log.Fatal(err)
	}
	reqSpider.Header.Set("content-length", "0")
	reqSpider.Header.Set("accept", "*/*")
	reqSpider.Header.Set("x-requested-with", "XMLHttpRequest")
	respSpider, err := Client.Do(reqSpider)
	if err != nil {
		log.Fatal(err)
	}
	bodyText, _ := ioutil.ReadAll(respSpider.Body)
	var result Result
	_ = json.Unmarshal(bodyText, &result)
	fmt.Println(i,result.Data)
}

func main() {
	url := "http://localhost:3000/api/v1/products"
	ch := make(chan bool)
	start := time.Now()
	for i := 0; i < 10; i++ {
		go Spider(url, ch, i)
	}
	for i := 0; i < 10; i++ {
		<-ch
	}
	elapsed := time.Since(start)
	fmt.Printf("Time %s", elapsed)
}

	var wg sync.WaitGroup
	wg.Add(10)

	for i := 0; i < 10; i++ {
		go func(i int) {
			defer wg.Done()
			SpiderWaitGroup(url,i)
		}(i)
	}

wg.Wait()

	NormalStart(url) // 单线程爬虫
	ChannelStart(url) // Channel多线程爬虫
	WaitGroupStart(url) // Wait 多线程爬虫