J2ME Socket编程
Socket是套接字，它是基于TCP协议的传输。在J2ME开发Socket的流程：
1. 服务器监听某个端口
2. 客户端连接服务器的某个端口
3.通过Socket通讯
在J2ME开发包javax.microedition.io中包含了 HttpConnection, HttpsConnection, SocketConnection,ServerSocketConnection和UDPDatagramConnection类，其中输入流和输出流包含在java.io包中，
这里主要用到的是SocketConnection和ServerSocketConnection这两个类;
代码如下
服务器端：
try { //监听1234端口ServerSocketConnection ssc = (ServerSocketConnection) Connector.open("socket://1234");SocketConnection sc = (SocketConnection) ssc.acceptAndOpen(); //等待客户连接，如果客户没有连接的话，这里程序就会在这阻塞} catch (IOException e) {e.printStackTrace();}
客户端
try { //连接服务器1234端口SocketConnection sc = (SocketConnection) Connector.open("socket:127.0.0.1//1234");} catch (IOException e) {e.printStackTrace();}
通过以上代码这样就能客户端与服务器端通信了，其中服务器端的SocketConnection 对象sc与客服端的SocketConnection 对象sc 是同一个对象。SocketConnection几个常用的方法有：
getAddress();得到客户端地址
setSocketOption：设置一些参数，一般可以用默认
openDataInputStream / openInputStream; 打开输入流
openDataOutputStream / openOutputStream; 打开输出流
例当客服器端向服务器端发送一个字符串，同样在服务器端能够打印出来，代码如下：
服务器端
package com.easymorse;import java.io.DataInputStream;import java.io.IOException;import javax.microedition.io.Connector;import javax.microedition.io.ServerSocketConnection;import javax.microedition.io.SocketConnection;import javax.microedition.midlet.MIDlet;import javax.microedition.midlet.MIDletStateChangeException;public class ServerMIdlet extends MIDlet {public ServerMIdlet() {}protected void destroyApp(boolean arg0) throws MIDletStateChangeException {}protected void pauseApp() {}protected void startApp() throws MIDletStateChangeException {try { //监听1234端口ServerSocketConnection ssc = (ServerSocketConnection) Connector.open("socket://1234");SocketConnection sc = (SocketConnection) ssc.acceptAndOpen(); //等待客户连接，如果客户没有连接的话，这里程序就会在这阻塞DataInputStream dis = (DataInputStream) sc.openDataInputStream();String msg = dis.readUTF();System.out.println(msg);} catch (IOException e) {e.printStackTrace();}}}
客户端：
package com.easymorse;import java.io.DataOutputStream;import java.io.IOException;import javax.microedition.io.Connector;import javax.microedition.io.ServerSocketConnection;import javax.microedition.io.SocketConnection;import javax.microedition.midlet.MIDlet;import javax.microedition.midlet.MIDletStateChangeException;public class ClientSocketMIDlet extends MIDlet {public ClientSocketMIDlet() {}protected void destroyApp(boolean unconditional)throws MIDletStateChangeException {}protected void pauseApp() {}protected void startApp() throws MIDletStateChangeException {try { //连接服务器1234端口SocketConnection sc = (SocketConnection) Connector.open("socket:127.0.0.1//1234");DataOutputStream dos = sc.openDataOutputStream();dos.writeUTF("你好服务器");} catch (IOException e) {e.printStackTrace();}}}
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