java爬虫获取网页源码2种方式（纯净版）

　　第一种：URLpackage InternetTest; import java.io.ByteArrayOutputStream; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.URL; public class a44 {     public static void main(String[] args) throws Exception {         URL url = new URL(＂http://www.baidu.com＂);         HttpURLConnection conn = (HttpURLConnection)url.openConnection();         conn.setRequestMethod(＂GET＂);         conn.setConnectTimeout(5 * 1024);         InputStream inStream =  conn.getInputStream();         ByteArrayOutputStream outStream = new ByteArrayOutputStream();         byte[] buffer = new byte[1024];         int len = 0;         while ((len = inStream.read(buffer)) != -1) {             outStream.write(buffer, 0, len);         }         inStream.close();         byte[] data =outStream.toByteArray();         String htmlSource = new String(data);         System.out.println(htmlSource);     } }
　　第二种：HttpClientpackage InternetTest; import org.apache.http.HttpEntity; import org.apache.http.HttpStatus; import org.apache.http.client.methods.CloseableHttpResponse; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.utils.HttpClientUtils; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClients; import org.apache.http.util.EntityUtils; public class a45 {     public static void main(String[] args) throws Exception{         String url1 = ＂http://www.baidu.com＂;         CloseableHttpClient closeableHttpClient = HttpClients.createDefault();         CloseableHttpResponse closeableHttpResponse = null;         HttpGet request = new HttpGet(url1);         closeableHttpResponse = closeableHttpClient.execute(request);         if(closeableHttpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {             HttpEntity httpEntity = closeableHttpResponse.getEntity();             String html = EntityUtils.toString(httpEntity, ＂utf-8＂);             System.out.println(html);         } else {             System.out.println(EntityUtils.toString(closeableHttpResponse.getEntity(), ＂utf-8＂));         }         HttpClientUtils.closeQuietly(closeableHttpResponse);         HttpClientUtils.closeQuietly(closeableHttpClient);     } }