socket通訊的例項：

服務端：

/**
 * <b>專案名：</b>複習總結<br/>
 * <b>包   名：</b>socket<br/>
 * <b>檔名：</b>Server.java<br/>
 * <b>版本資訊：</b>1.0.0<br/>
 * <b>日期：</b>2014-10-22-上午9:45:20<br/>
 * 
 */
package socket;


import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.logging.Level;
import java.util.logging.Logger;


/**
 * <b>類   名：</b>Server<br/>
 * <b>類描述：</b><br/>
 * <b>建立人：</b>hebl<br/>
 * <b>建立時間：</b>2014-10-22 上午9:45:20<br/>
 * <b>修改人：</b>hebl<br/>
 * <b>修改時間：</b>2014-10-22 上午9:45:20<br/>
 * <b>修改備註：</b><br/>
 *
 * @version 1.0.0<br/>
 * 
 */
public class Server {


private final static Logger logger = Logger.getLogger(Server.class.getName());

public static void main(String[] args) throws IOException {
ServerSocket server = new ServerSocket(10000);//設定埠號


while (true) {
Socket socket = server.accept();// 等待服務的請求
invoke(socket);
}
}


private static void invoke(final Socket socket) throws IOException {
new Thread(new Runnable() {
public void run() {
ObjectInputStream is = null;
ObjectOutputStream os = null;
try {
is = new ObjectInputStream(new BufferedInputStream(socket.getInputStream()));
os = new ObjectOutputStream(socket.getOutputStream());


Object obj = is.readObject();
User user = (User)obj;
System.out.println("user: " + user.getUserName() + "/" + user.getPassWord());


user.setUserName(user.getUserName() + "_new");
user.setPassWord(user.getPassWord() + "_new");


os.writeObject(user);
os.flush();
} catch (IOException ex) {
logger.log(Level.SEVERE, null, ex);
} catch(ClassNotFoundException ex) {
logger.log(Level.SEVERE, null, ex);
} finally {
try {
is.close();
} catch(Exception ex) {}
try {
os.close();
} catch(Exception ex) {}
try {
socket.close();
} catch(Exception ex) {}
}
}
}).start();
}
}

客戶端：

/**
 * <b>專案名：</b>複習總結<br/>
 * <b>包   名：</b>socket<br/>
 * <b>檔名：</b>Client.java<br/>
 * <b>版本資訊：</b>1.0.0<br/>
 * <b>日期：</b>2014-10-22-上午9:45:40<br/>
 * 
 */
package socket;


import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;
import java.util.logging.Level;
import java.util.logging.Logger;


/**
 * <b>類   名：</b>Client<br/>
 * <b>類描述：</b><br/>
 * <b>建立人：</b>hebl<br/>
 * <b>建立時間：</b>2014-10-22 上午9:45:40<br/>
 * <b>修改人：</b>hebl<br/>
 * <b>修改時間：</b>2014-10-22 上午9:45:40<br/>
 * <b>修改備註：</b><br/>
 *
 * @version 1.0.0<br/>
 * 
 */
public class Client {

private final static Logger logger = Logger.getLogger(Client.class.getName());

public static void main(String[] args) throws Exception {
for (int i = 0; i < 100; i++) {
Socket socket = null;
ObjectOutputStream os = null;
ObjectInputStream is = null;

try {
socket = new Socket("localhost", 10000);

os = new ObjectOutputStream(socket.getOutputStream());
User user = new User("user_" + i, "password_" + i);
os.writeObject(user);
os.flush();

is = new ObjectInputStream(new BufferedInputStream(socket.getInputStream()));
Object obj = is.readObject();
if (obj != null) {
user = (User)obj;
System.out.println("user: " + user.getUserName() + "/" + user.getPassWord());
}
} catch(IOException ex) {
logger.log(Level.SEVERE, null, ex);
} finally {
try {
is.close();
} catch(Exception ex) {}
try {
os.close();
} catch(Exception ex) {}
try {
socket.close();
} catch(Exception ex) {}
}
}
}
}

http請求：

1、get方式請求

private static String getHtml(String url) {


String urlString = url;
if (!url.startsWith("http://")) {
urlString = "http://" + url;
}
WebClient webClient;
String html = null;
webClient = new WebClient(BrowserVersion.FIREFOX_3_6);
webClient.setJavaScriptEnabled(false);
webClient.setCssEnabled(false);
webClient.setAjaxController(new NicelyResynchronizingAjaxController());
webClient.setTimeout(60000);
webClient.setThrowExceptionOnScriptError(false);
HtmlPage page;
try {
//會有型別轉換錯誤異常
page = (HtmlPage) webClient.getPage(urlString);
html = page.asXml();
} catch (Exception e) {
System.out.println("此url不合法" + url+e);
}
return html;
}

2、post方式請求

/**
* 使用post方式傳送請求
* @param url
* @param params
* @return
*/
public static Document post(String url, List<NameValuePair> params) {
// POST的URL
HttpPost httppost = new HttpPost(url);
String result = "";
// 新增引數
try {
httppost.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
// 設定編碼
HttpResponse response = new DefaultHttpClient().execute(httppost);
// 傳送Post,並返回一個HttpResponse物件
// Header header = response.getFirstHeader("Content-Length");
// String Length=header.getValue();
// 上面兩行可以得dfkjb
if (response.getStatusLine().getStatusCode() == 200) {// 如果狀態碼為200,就是正常返回
result += EntityUtils.toString(response.getEntity());
// 得到返回的字串
// 列印輸出
// 如果是下載檔案,可以用response.getEntity().getContent()返回InputStream
}
} catch (Exception e) {
e.printStackTrace();
}
return Jsoup.parse(result) ;
}