最近做一个项目，需求中需要服务器主动推送消息到客户端。这样的话一般的http连接就不能使用了。博主问了个朋友，向我推荐websocket协议，特此测试了一下，发现效果很好。

android本身没有websocket的库，需要自己下载 ，下载地址。

客户端代码：

界面布局自己写，很简单的两个button

package com.example.test; import com.example.test.R; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; import de.tavendo.autobahn.WebSocketConnection; import de.tavendo.autobahn.WebSocketConnectionHandler; import de.tavendo.autobahn.WebSocketException; public class MainActivity extends Activity implements OnClickListener { private Button bt; private EditText ed_name; private EditText ed_text; private Button bt1; WebSocketConnection wsc; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); bt = (Button) findViewById(R.id.bt); ed_name = (EditText) findViewById(R.id.ed_name); ed_text = (EditText) findViewById(R.id.ed_text); bt1 = (Button) findViewById(R.id.bt1); bt.setOnClickListener(this); bt1.setOnClickListener(this); wsc = new WebSocketConnection(); } private void connect() { System.out.println("开始连接websocket///"); try { wsc.connect("ws://192.168.1.245:8080/DriveServer/mainservlet", new WebSocketConnectionHandler() { @Override public void onBinaryMessage(byte[] payload) { System.out.println("onBinaryMessage size=" + payload.length); } @Override public void onClose(int code, String reason) { System.out.println("onClose reason=" + reason); } @Override public void onOpen() { System.out.println("onOpen"); showtext("连接成功"); // wsc.sendTextMessage("Hello!"); // wsc.disconnect(); } @Override public void onRawTextMessage(byte[] payload) { System.out.println("onRawTextMessage size=" + payload.length); } @Override public void onTextMessage(String payload) { System.out.println("onTextMessage" + payload); showtext(payload); } }); } catch (WebSocketException e) { // TODO Auto-generated catch block e.printStackTrace(); } } @Override public void onClick(View v) { // TODO Auto-generated method stub int id = v.getId(); switch (id) { case R.id.bt : wsc.sendTextMessage("我是客户端，我通过ws往服务器发数据"); break; case R.id.bt1 : connect(); break; default : break; } } private void showtext(String msg) { Toast.makeText(this, msg, 0).show(); } }

下面是服务器代码：

用的是jetty7自带的websocket库

package com.websocket; import java.io.IOException; import java.io.UnsupportedEncodingException; import java.nio.ByteBuffer; import java.nio.CharBuffer; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Set; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.eclipse.jetty.websocket.WebSocket; import org.eclipse.jetty.websocket.WebSocket.OnTextMessage; import org.eclipse.jetty.websocket.WebSocketServlet; public class ChatWebSocketServlet extends WebSocketServlet { private static final long serialVersionUID = 911879078000755859L; private List<MyWebSocket> list = new ArrayList<MyWebSocket>(); class MyWebSocket implements OnTextMessage { private String userName = "匿名用户"; public MyWebSocket(String userName) { if (userName != null && userName.length() > 0) { this.userName = userName; } } private Connection conn; public void onClose(int arg0, String arg1) { // TODO Auto-generated method stub System.out.println("onOpen 断开连接了。。。。。。。。" + arg1 + " " + arg0); list.remove(this); } public void onOpen(Connection arg0) { // TODO Auto-generated method stub System.out .println("onOpen 连接了。。。。。。。。。。。。" + arg0.getMaxIdleTime()); this.conn = arg0; if (!list.contains(arg0)) { list.add(this); } else { System.out.println("这个用户已经连接了"); } System.out.println(".." + list.size()); } public void onMessage(String arg0) { String toname = arg0.substring(0, 3); System.out.println("toname-->" + toname); try { list.get(0).getConn() .sendMessage(arg0.substring(3)); System.out.println("发送的数据" + arg0.substring(3)); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } private Connection getConn() { return this.conn; } } public WebSocket doWebSocketConnect(HttpServletRequest arg0, String arg1) { // TODO Auto-generated method stub String name = ""; name = arg0.getParameter("username"); System.out.println(name + "is connected"); return new MyWebSocket(name); } @Override protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub super.service(request, response); } }

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。