Apache HttpClient库编写的Scala下载器程序,用于下载图片。代码如下:
import org.apache.http.HttpHost import org.apache.http.client.HttpClients import org.apache.http.client.methods.HttpHead import org.apache.http.impl.client.CloseableHttpClient import org.apache.http.impl.client.HttpClients.createDefault import org.apache.http.util.EntityUtils object WeiboImageDownloader { def main(args: Array[String]): Unit = { val proxyHost = "" val proxyPort = val host = new HttpHost(proxyHost, proxyPort, "http") val httpClient = HttpClients.createDefault() httpClient.getParams().setParameter("http.proxyHost", proxyHost) httpClient.getParams().setParameter("http.proxyPort", proxyPort.toString()) val httpHead = new HttpHead("") val response = httpClient.execute(host, httpHead) val contentLength = response.getStatusLine().getStatusCode() if (contentLength == 200) { val entity = response.getEntity() if (entity != null) { val content = EntityUtils.toString(entity) println(content) } } } }
程序首先导入所需的Apache HttpClient库和HttpHost,HttpClient和HttpHead类。然后,程序创建一个名为WeiboImageDownloader
的类,并在其中定义一个名为main
的方法。在main
方法中,程序首先定义服务器的主机名和端口号,然后创建一个HttpClient对象,并设置其使用服务器。然后,程序创建一个HttpHead对象,并使用HttpClient对象执行该对象以获取网页的头部信息。然后,程序检查返回的状态码,如果状态码为200,则表示请求成功,程序获取响应实体,并将其内容打印到控制台。如果状态码不为200,则表示请求失败。