用Java的socket编程实现c⼀s结构程序

2024-11-08 05:44:16

推荐回答（1个）

回答1：

今天太晚了，改天给你做一个，记得提醒我，这个如果只是要个简单的，我半个小时就搞定了

给我个邮箱

现在给贴出我的代码：整个结构分两个工程
1。服务端工程NioServer.java：采用nio 方式的异步socket通信，不仅可以实现你的服务器还可以让你多学习一下什么是nio
2。客户端工程UserClient.java: 采用Swing技术画了一个简单的UI界面，比较土，原因是我没那么多时间去设计界面，你需要的话可以自己去修改得漂亮点，相信不难

现在贴工程1:
package com.net;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.Iterator;
import java.util.Set;

public class NioServer {
public static final int SERVERPORT=5555;
public static final String USERNAME="wangzhirong";
public static final String PASSWORD="123456";
public static final String ISACK="ACK";
public static final String ISNAK="NAK!";
// Selector selector;//选择器
// SelectionKey key;//key。一个key代表一个Selector 在NIO通道上的注册,类似主键;
// //取得这个Key后就可以对Selector在通道上进行操作
private ByteBuffer echoBuffer = ByteBuffer.allocate( 1024 );// 通道数据缓冲区
public NioServer(){
}
public static void main(String[] args) throws IOException {
NioServer ns=new NioServer();
ns.BuildNioServer();
}
public void BuildNioServer() throws IOException{
/////////////////////////////////////////////////////////
///////先对服务端的ServerSocket进行注册,注册到Selector ////
/////////////////////////////////////////////////////////
ServerSocketChannel ssc = ServerSocketChannel.open();//新建NIO通道
ssc.configureBlocking( false );//使通道为非阻塞
ServerSocket ss = ssc.socket();//创建基于NIO通道的socket连接
//新建socket通道的端口
ss.bind(new InetSocketAddress("127.0.0.1",SERVERPORT));
Selector selector=Selector.open();//获取一个选择器
//将NIO通道选绑定到择器,当然绑定后分配的主键为skey
SelectionKey skey = ssc.register( selector, SelectionKey.OP_ACCEPT );
////////////////////////////////////////////////////////////////////
//// 接收客户端的连接Socket,并将此Socket也接连注册到Selector ////
///////////////////////////////////////////////////////////////////
while(true){
int num = selector.select();//获取通道内是否有选择器的关心事件
if(num<1){continue; }
Set selectedKeys = selector.selectedKeys();//获取通道内关心事件的集合
Iterator it = selectedKeys.iterator();
while (it.hasNext()) {//遍历每个事件
try{
SelectionKey key = (SelectionKey)it.next();
//有一个新联接接入事件,服务端事件
if ((key.readyOps() & SelectionKey.OP_ACCEPT)
== SelectionKey.OP_ACCEPT) {
// 接收这个新连接
ServerSocketChannel serverChanel = (ServerSocketChannel)key.channel();
//从serverSocketChannel中创建出与客户端的连接socketChannel
SocketChannel sc = serverChanel.accept();
sc.configureBlocking( false );
// Add the new connection to the selector
// 把新连接注册到选择器
SelectionKey newKey = sc.register( selector,
SelectionKey.OP_READ );
it.remove();
System.out.println( "Got connection from "+sc );
}else
//读客户端数据的事件,此时有客户端发数据过来,客户端事件
if((key.readyOps() & SelectionKey.OP_READ)
== SelectionKey.OP_READ){
// 读取数据
SocketChannel sc = (SocketChannel)key.channel();
int bytesEchoed = 0;
while((bytesEchoed = sc.read(echoBuffer))> 0){
System.out.println("bytesEchoed:"+bytesEchoed);
}
echoBuffer.flip();
System.out.println("limet:"+echoBuffer.limit());
byte [] content = new byte[echoBuffer.limit()];
echoBuffer.get(content);
String result=new String(content);
doPost(result,sc);
echoBuffer.clear();
it.remove();
}
}catch(Exception e){}
}
}
}

public void doPost(String str,SocketChannel sc){
boolean isok=false;
int index=str.indexOf('|');
if(index>0){
String name=str.substring(0,index);
String pswd=str.substring(index+1);
if(pswd==null){pswd="";}
if(name!=null){
if(name.equals(USERNAME)
&& pswd.equals(PASSWORD)
){
isok=true;
}else{
isok=false;
}
}else{
isok=false;
}
}else{
isok=false;
}
String result="";
if(isok){
result="ACK";
}else{
result="NAK!";
}
ByteBuffer bb = ByteBuffer.allocate( result.length() );
bb.put(result.getBytes());
bb.flip();
try {
sc.write(bb);
} catch (IOException e) {
e.printStackTrace();
}
bb.clear();
}

}

下面贴工程2
import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
public class UserClient implements ActionListener{
JFrame jf;
JPanel jp;
JLabel label_name;
JLabel label_pswd;
JTextField userName;
JButton jb;
JPasswordField paswrd;
JLabel hintStr;
public UserClient (){
jf=new JFrame("XXX 登陆系统");
jp=new JPanel();
jf.setContentPane(jp);
jf.setPreferredSize(new Dimension(350,220));
jp.setPreferredSize(new Dimension(350,220));
jp.setBackground(Color.gray);
label_name=new JLabel();
label_name.setPreferredSize(new Dimension(150,30));
label_name.setText("请输入帐户(数字或英文):");
userName=new JTextField();
userName.setPreferredSize(new Dimension(150,30));
jp.add(label_name);
jp.add(userName);
label_pswd=new JLabel();
label_pswd.setPreferredSize(new Dimension(150,30));
label_pswd.setText("请输入密码:");
jp.add(label_pswd);
paswrd=new JPasswordField();
paswrd.setPreferredSize(new Dimension(150,30));
jp.add(paswrd);
jb=new JButton("OK");
jb.setPreferredSize(new Dimension(150,30));
jb.setText("确定");
jb.addActionListener( this);
jp.add(jb);
hintStr=new JLabel();
hintStr.setPreferredSize(new Dimension(210,40));
hintStr.setText("");
hintStr.setForeground(Color.RED);
jp.add(hintStr);
jf.pack();
jf.setVisible(true);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

private String name;
private String pswd;
public void actionPerformed(ActionEvent e) {
name=userName.getText().trim();
pswd=new String(paswrd.getPassword());
if(pswd==null){
pswd="";
}else{
pswd=pswd.trim();
}
if(name!=null && name.length()>0){
hintStr.setText("正在验证客户端，请稍候...");
start();
}
}

OutputStream os;
Socket s;
InputStream is;
public void start(){
//建立联网线程
new Thread(new Runnable(){
public void run() {
try {
s=new Socket("127.0.0.1",5555);
//写
os=s.getOutputStream();
os.write(name.getBytes());
os.write('|');//用户名与密码用"|"分隔
os.write(pswd.getBytes());
os.flush();
//读内容
Thread.sleep(1000);
is=s.getInputStream();
int len=is.available();
System.out.println("len:"+len);
byte[] bytes=new byte[len];
is.read(bytes);
String resut=new String(bytes);
System.out.println("resut:"+resut);
//TODO 这里通过返回结果处理
if(resut.equals("ACK")){
hintStr.setText("验证成功，欢迎光临!");
}else{
paswrd.setText(null);
hintStr.setText("用户名或密码错误，请重新输入");
}
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}finally{
// try {
// os.close();
// is.close();
// s.close();
// } catch (IOException e) {
// e.printStackTrace();
// }
}
}
}).start();
}

public static void main(String[] args) {
new UserClient();
}

}