OkHttpUrlConnection库编写的爬虫程序,该程序使用Kotlin编写的。
```kotlin
import java.net.HttpURLConnection
import java.net.URL
import java.net.URLConnection
import java.io.BufferedReader
import java.io.InputStreamReader
fun main() {
val url = URL("https://www.dingtalk.com/")
val proxy = "http://www.duoip.cn:8000"
val connection = URLConnection(url)
connection.setRequestProperty("Proxy-Host", proxy)
connection.setRequestProperty("Proxy-Port", "8000")
connection.connect()
val bufferedReader = BufferedReader(InputStreamReader(connection.getInputStream()))
var line = bufferedReader.readLine() as String
while (line != null) {
if (line.contains("img alt")) {
val imageUrl = line.substring(line.indexOf("src") + 4, line.lastIndexOf("alt") - 1)
downloadImage(imageUrl)
}
line = bufferedReader.readLine()
}
bufferedReader.close()
connection.disconnect()
}
fun downloadImage(imageUrl: String) {
val url = URL(imageUrl)
val connection = URLConnection(url)
connection.connect()
}
```
代码解释:
1. 创建URL对象,用于指定要爬取的网站的URL。
2. 创建一个连接,使用主机和端口。
3. 连接到目标网站。
4. 创建一个BufferedReader对象,用于读取目标网站的HTML内容。