一、Java.net.URL
1 import java.io.BufferedReader;
2 import java.io.InputStreamReader;
3 import java.net.URL;
4
5 public class RetrivePage {
6 public static String downloadPage(String path) throws Exception {
7 URL pageURL = new URL(path);
8 BufferedReader reader = new BufferedReader(new InputStreamReader(pageURL.openStream()));
9 String line;
10 StringBuilder pageBuffer = new StringBuilder();
11 while ((line = reader.readLine()) != null) {
12 pageBuffer.append(line);
13 }
14 return pageBuffer.toString();
15 }
16
17 public static void main(String args[]) throws Exception {
18 System.out.println(RetrivePage.downloadPage("http://www.sina.com"));
19 }
20 } 二、Scanner對象
1 import java.io.InputStreamReader;
2 import java.net.URL;
3 import java.util.Scanner;
4
5 public class RetrivePage {
6 public static String downloadPage(String path) throws Exception {
7 URL pageURL = new URL(path);
8 Scanner scanner = new Scanner(new InputStreamReader(pageURL.openStream(), "utf-8"));
9 scanner.useDelimiter("\\z");
10 StringBuilder pageBuffer = new StringBuilder();
11 while (scanner.hasNext()) {
12 pageBuffer.append(scanner.next());
13 }
14 return pageBuffer.toString();
15 }
16
17 public static void main(String args[]) throws Exception {
18 System.out.println(RetrivePage.downloadPage("http://www.sina.com"));
19 }
20 } 三、套接字
1 import java.io.*;
2 import java.net.Socket;
3
4 public class RetrivePage {
5 public static void main(String args[]) throws Exception {
6 String host = "blog.csdn.net";
7 String file = "/column.html";
8 int port = 80;
9 Socket s = new Socket(host, port);
10 OutputStream out = s.getOutputStream();
11 PrintWriter outw = new PrintWriter(out, false);
12 outw.print("GET" + file + " HTTP/1.0\r\n");
13 outw.print("Accept:text/plain,text/html,text/*\r\n");
14 outw.print("\r\n");
15 outw.flush();
16 InputStream in = s.getInputStream();
17 InputStreamReader inr = new InputStreamReader(in);
18 BufferedReader bufferedReader = new BufferedReader(inr);
19 String line;
20 while ((line = bufferedReader.readLine()) != null) {
21 System.out.println(line);
22 }
23 }
24 } 四、HttpClient
1 import org.apache.http.HttpEntity;
2 import org.apache.http.HttpResponse;
3 import org.apache.http.client.HttpClient;
4 import org.apache.http.client.methods.HttpGet;
5 import org.apache.http.impl.client.DefaultHttpClient;
6 import org.apache.http.util.EntityUtils;
7 public class RetrivePage {
8 public static void main(String args[]) throws Exception {
9 HttpClient httpClient=new DefaultHttpClient();
10 HttpGet httpGet=new HttpGet("http://www.sina.com");
11 HttpResponse response=httpClient.execute(httpGet);
12 HttpEntity entity=response.getEntity();
13 if(entity!=null){
14 System.out.println(EntityUtils.toString(entity,"utf-8"));
15 EntityUtils.consume(entity);
16 }
17 httpClient.getConnectionManager().shutdown();
18 }
19 } 如果，您認為閱讀這篇部落格讓您有些收獲，不妨拿出手機【微信掃一掃】
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