第一种：URL

package 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：HttpClient

package 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);
    }
}

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