在java中客户端和服务端简单实现代码

--------------------------------------------------------客户端-----------------------------------------------------------------------

package SRC;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;

import javax.microedition.io.Connector;
import javax.microedition.io.SocketConnection;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.TextField;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
//客户端
public class ClientMIDlet extends MIDlet implements CommandListener , Runnable{

 private SocketConnection sc;
 private DataOutputStream dos;
 private DataInputStream dis;
 private Form f ;
 private TextField textfield;
 private Display display;
 private Command cmd = new Command("send",Command.OK,1);

 public ClientMIDlet() {
  display = Display.getDisplay(this);
  textfield = new TextField("信息","",255,TextField.ANY);
  f = new Form("客户端");
  try {
   sc = (SocketConnection) Connector.open("socket://127.0.0.1:9999");
   dos = sc.openDataOutputStream();
   dis = sc.openDataInputStream();
   
  } catch (IOException e) {
   
   e.printStackTrace();
  }
  
  new Thread(this).start();
  
 }

 protected void startApp() throws MIDletStateChangeException {
      
  display.setCurrent(f);
     f.append(textfield);
     f.addCommand(cmd);
     f.setCommandListener(this);
 

 }
 protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
 

 }

 protected void pauseApp() {
 

 }

 public void commandAction(Command c, Displayable d) {
  if(c == cmd){
   
   try {
    
    dos.writeUTF(textfield.getString());
   } catch (IOException e) {
    // TODO 自动生成 catch 块
    e.printStackTrace();
   }
  }
  
 }

 public void run() {
  while(true){
   try {
    f.append(dis.readUTF()+"/n");
   } catch (IOException e) {
    // TODO 自动生成 catch 块
    e.printStackTrace();
   }
  }
  
 }

 

}

---------------------------------------------------------服务端---------------------------------------------------------------------
package SRC;

import java.io.DataInputStream;
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.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.TextField;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
//服务器端
public class ServerMIDlet extends MIDlet implements Runnable, CommandListener{

 private ServerSocketConnection ssc;
 private SocketConnection sc = null;
 private DataInputStream dis = null;
 private DataOutputStream dos = null;
 private Display display;
 private Form f;
 private Command cmd = new Command("send",Command.BACK,1);
 TextField textfield = new TextField("输入聊天信息","",255,TextField.ANY);
 //private String str= "";
 public ServerMIDlet() throws IOException {
  f = new Form("服务器");
  display = Display.getDisplay(this);
  ssc = (ServerSocketConnection) Connector.open("socket://:9999");
  sc = (SocketConnection) ssc.acceptAndOpen();
  dis = sc.openDataInputStream();
  dos = sc.openDataOutputStream();
  new Thread(this).start();
 }
 protected void startApp() throws MIDletStateChangeException {
  display.setCurrent(f);
  f.append(textfield);
  f.addCommand(cmd);
  f.setCommandListener(this);

 }
 protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
 

 }

 protected void pauseApp(){
  

 }

 public void run() {
  while(true){
   
       try {      
     f.append(dis.readUTF()+"/n");
    } catch (IOException e) {
     System.out.println("asdfasdfsf");
     e.printStackTrace();
    }
  }
  
 }
 public void commandAction(Command c, Displayable d) {
  if(c == cmd){
   try {
    dos.writeUTF(textfield.getString());
   } catch (IOException e) {
    
    e.printStackTrace();
   }
  }
  
 }

 

}
package SRC;

import java.io.DataInputStream;
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.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.TextField;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
//服务器端
public class ServerMIDlet extends MIDlet implements Runnable, CommandListener{

 private ServerSocketConnection ssc;
 private SocketConnection sc = null;
 private DataInputStream dis = null;
 private DataOutputStream dos = null;
 private Display display;
 private Form f;
 private Command cmd = new Command("send",Command.BACK,1);
 TextField textfield = new TextField("输入聊天信息","",255,TextField.ANY);
 //private String str= "";
 public ServerMIDlet() throws IOException {
  f = new Form("服务器");
  display = Display.getDisplay(this);
  ssc = (ServerSocketConnection) Connector.open("socket://:9999");
  sc = (SocketConnection) ssc.acceptAndOpen();
  dis = sc.openDataInputStream();
  dos = sc.openDataOutputStream();
  new Thread(this).start();
 }
 protected void startApp() throws MIDletStateChangeException {
  display.setCurrent(f);
  f.append(textfield);
  f.addCommand(cmd);
  f.setCommandListener(this);

 }
 protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
 

 }

 protected void pauseApp(){
  

 }

 public void run() {
  while(true){
   
       try {      
     f.append(dis.readUTF()+"/n");
    } catch (IOException e) {
     System.out.println("asdfasdfsf");
     e.printStackTrace();
    }
  }
  
 }
 public void commandAction(Command c, Displayable d) {
  if(c == cmd){
   try {
    dos.writeUTF(textfield.getString());
   } catch (IOException e) {
    
    e.printStackTrace();
   }
  }
  
 }

 

}