How to remove spaces in content with golang crawler

Golang is an efficient programming language that is widely used in various application development, including web crawlers. This article will focus on how to use Golang to write a crawler and remove spaces from the crawled content.

1. Crawling HTML pages

The crawler needs to initiate an HTTP request to obtain the website page. The following code snippet can achieve this function:

import (
    "fmt"
    "net/http"
)

func main() {
    response, err := http.Get("https://www.example.com")
    if err != nil {
        fmt.Println("HTTP请求错误：", err)
    }
    defer response.Body.Close()
    // 处理HTTP响应内容
}

2. Processing HTTP response content

Processing HTTP response content requires the help of a third-party library. For example, use the goquery library to parse the HTML page, and then use the strings library. Function removes spaces. The specific code is as follows:

import (
    "fmt"
    "github.com/PuerkitoBio/goquery"
    "net/http"
    "strings"
)

func main() {
    response, err := http.Get("https://www.example.com")
    if err != nil {
        fmt.Println("HTTP请求错误：", err)
    }
    defer response.Body.Close()
    // 解析HTML页面
    document, err := goquery.NewDocumentFromReader(response.Body)
    if err != nil {
        fmt.Println("解析HTML页面错误：", err)
    }
    // 获取HTML页面中的所有文本内容并去除空格
    text := strings.TrimSpace(document.Text())
    fmt.Println(text)
}

goquery library is a very easy-to-use HTML parsing library that can easily obtain any element in the page without worrying about pointers and memory management in the Go language. question.

3. Write the processed text to a file

After processing the text content, you usually need to write it to a file, which can be achieved through the following code:

import (
    "fmt"
    "github.com/PuerkitoBio/goquery"
    "io/ioutil"
    "net/http"
    "strings"
)

func main() {
    response, err := http.Get("https://www.example.com")
    if err != nil {
        fmt.Println("HTTP请求错误：", err)
    }
    defer response.Body.Close()
    // 解析HTML页面
    document, err := goquery.NewDocumentFromReader(response.Body)
    if err != nil {
        fmt.Println("解析HTML页面错误：", err)
    }
    // 获取HTML页面中的所有文本内容并去除空格
    text := strings.TrimSpace(document.Text())
    // 将文本内容写入文件
    err = ioutil.WriteFile("output.txt", []byte(text), 0644)
    if err != nil {
        fmt.Println("写入文件错误：", err)
    }
}

4. Summary

The above is how to use Golang to write a crawler and remove spaces in the crawled content. Get the page through HTTP request, use the goquery library to parse the HTML, then use the strings library to remove spaces, and finally write the results to a file. Writing efficient crawlers requires experience, but using Golang allows developers to easily write efficient web crawlers.

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