socket通信

socket.getInputStream();得到输入流，然后从输入流里读取数据。

BufferedReader in = new BufferedReader(new InputStreamReader(socket
.getInputStream()));
// 建立一个输出流对象,用于向服务器发送消息
PrintWriter out = new PrintWriter(new BufferedWriter(
// 参数为true, 自动刷新输出流,以免网络阻塞
new OutputStreamWriter(socket.getOutputStream())), true);
for (int i = 0; i < 5; i++) {
// 向服务器发送”你好” 消息，该发送信息可以换作是控制台，
//也可以是从界面的输入框等各种途径获得，然后发送给服务器就ok了
out.println("你好" + i);
// 读服务器的返回消息
String str = in.readLine();
// 在客户端输出服务器消息
System.out.println(str);
}

我这样读的好像有问题byte buffer[] = new byte[10240];
socket.getInputStream().read(buffer);
for (int i = 0; i < buffer[i]; i++) {
System.out.println("" + buffer[i]);
}
读出来的是2，3这样的数字
应该是二进制的吧

BufferedReader buffin = new BufferedReader(new InputStreamReader(s.getInputStream()));

String str = null;
while ( (str = buffin.readLine())!= null ) {
System.out.println(str);
}

用BufferedReader来包装InputStreamReader，再读出来

import java.net.*;
import java.nio.*;
import java.nio.channels.*;
import java.nio.charset.*;
import java.awt.*;
import java.awt.event.*;public class ChatClient {
private SocketChannel sc = null;
private String name = null;
private Frame f;
private TextArea ta;
private TextField tf;
private boolean runnable = true; public static void main(String[] args){
ChatClient cc = new ChatClient();
cc.createUI();
cc.inputName();
cc.connect();
new ReceiveThread(cc,cc.getTextArea()).start();
}
public SocketChannel getSc(){
return sc;
}
public void setName(String name){
this.name = name;
}
public TextArea getTextArea(){
return ta;
}
public TextField getTextField(){
return tf;
}
public boolean getRunnable(){
return runnable;
}
public void stop(){
runnable = false;
}

public void shutDown(){
try{
sc.write(ByteBuffer.wrap("bye".getBytes("GBK")));
ta.append("Exit in 5 seconds!");
this.stop();
Thread.sleep(5000);
sc.close();
}catch(Exception e){
e.printStackTrace();
}
System.exit(0);
}

public void createUI(){
f = new Frame("Client");
ta = new TextArea();
ta.setEditable(false);
tf = new TextField();
Button send = new Button("Send");
Panel p = new Panel();
p.setLayout(new BorderLayout());
p.add(tf,"Center");
p.add(send,"East");
f.add(ta,"Center");
f.add(p,"South");
MyClientListener listener = new MyClientListener(this);
send.addActionListener(listener);
tf.addActionListener(listener);
f.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
ChatClient.this.shutDown();
}
});
f.setSize(400,400);
f.setLocation(600,0);
f.setVisible(true);
tf.requestFocus();
}

public boolean connect(){
try{
sc = SocketChannel.open();
//"zlg"为目标计算机名
InetSocketAddress isa = new InetSocketAddress("localhost",8888);
sc.connect(isa);
sc.configureBlocking(false);
sc.write(ByteBuffer.wrap(name.getBytes("GBK")));
}catch(Exception e){
e.printStackTrace();
}
return true;
}

public void inputName(){
String name = javax.swing.JOptionPane.showInputDialog("Input Your Name:");
this.setName(name);
f.setTitle(name);
}
}class MyClientListener implements ActionListener{
private ChatClient client;
public MyClientListener(ChatClient client){
this.client = client;
}
public void actionPerformed(ActionEvent e){
TextField tf = client.getTextField();
String info = tf.getText();
if(info.equals("bye")){
client.shutDown();
}else{
try{
client.getSc().write(ByteBuffer.wrap(info.getBytes("GBK")));
}catch (Exception e1) {
e1.printStackTrace();
}
}
tf.setText("");
tf.requestFocus();
}
}class ReceiveThread extends Thread{
private ChatClient client;
private TextArea ta;

public ReceiveThread(ChatClient client,TextArea ta){
this.client = client;
this.ta = ta;
}
public void run(){
SocketChannel sc = client.getSc();
ByteBuffer byteBuffer = ByteBuffer.allocate(2048);
CharBuffer charBuffer = null;
Charset charset = Charset.forName("GBK");
CharsetDecoder decoder = charset.newDecoder();
String msg = null;
int n = 0;
try{
while(client.getRunnable()){
n = sc.read(byteBuffer);
if(n>0){
byteBuffer.flip();
charBuffer = decoder.decode(byteBuffer);
msg = charBuffer.toString();
ta.append(msg + "\n");
}
byteBuffer.clear();
Thread.sleep(500);
}
}catch(Exception e){
e.printStackTrace();
System.exit(0);
}
}
}import java.io.*;
import java.nio.*;
import java.nio.channels.*;
import java.nio.charset.*;
import java.net.*;
import java.util.*;
public class ChatServer{
    private Selector selector = null;
    private ServerSocketChannel ssc = null;
    //服务器端通信端口号
    private int port = 8888;
    //在线用户列表
private Hashtable<String,SocketChannel> userList = null;

    public ChatServer(){}
public ChatServer(int port){
this.port = port;
    }

    //初始化服务器
    public void init(){
     try{
     //创建选择器对象
selector = Selector.open();
//创建ServerSocketChannel
ssc = ServerSocketChannel.open();
//设置ServerSocketChannel为非阻塞模式
ssc.configureBlocking(false);
InetAddress ia = InetAddress.getLocalHost();
InetSocketAddress isa = new InetSocketAddress(ia,port);
//将与本通道相关的服务器套接字对象帮定到指定地址和端口
ssc.socket().bind(isa);
//创建在线用户列表
userList = new Hashtable<String,SocketChannel>();
}catch(IOException e){
e.printStackTrace();
}
    }

    //启动服务器
public void start(){
try{
//将ServerSocketChannel注册到Selector上，准备接收新连接请求
SelectionKey acceptKey = ssc.register(selector, SelectionKey.OP_ACCEPT );
SocketChannel sc;
int n;
String name;    //用户名
String msg; //用户发言信息
while (true){
//选择当前所有处于就绪状态的通道所对应的选择键,并将这些键组成已选择键集
n = selector.select(); //n为已选择键集中键的个数
     if(n > 0 ){
     //获取此选择器的已选择键集。
Set readyKeys = selector.selectedKeys();
Iterator it = readyKeys.iterator();
//遍历当前已选择键集
while (it.hasNext()) {
SelectionKey key = (SelectionKey)it.next();
//从当前已选择键集中移除当前键，避免重复处理
it.remove();
//如果当前键对应的通道已准备好接受新的套接字连接
if (key.isAcceptable()) {
//获取当前键对应的可选择通道（ServerSocketChannel）
ssc = (ServerSocketChannel) key.channel();
//接收新的套接字连接请求，返回新建的SocketChannel
sc = (SocketChannel) ssc.accept();
//如果有新用户接入
if(sc != null){
//接收新上线用户姓名
name = readMessage(sc);
//设置新建的SocketChannel为非阻塞模式
sc.configureBlocking(false);
//将新建的SocketChannel注册到Selector上，准备进行数据"写"操作，
//并将当前用户名以附件的方式附带记录到新建的选择键上。
SelectionKey newKey = sc.register(selector,SelectionKey.OP_WRITE,name);
//将新上线用户信息加入到在线用户列表
userList.put(name,sc);
//发送"新用户上线"通知
transmitMessage(name + " in!","--Server Info--");
}
}
//否则，如果当前键对应的通道已准备好进行"写"操作
else if (key.isWritable()) {
//获取当前键对应的可选择通道（SocketChannel）
sc = (SocketChannel)key.channel();
//接收该通道相应用户的发言信息
msg = readMessage(sc);
//获取选择键上附带记录的当前用户名
name = key.attachment().toString();
//如果用户提出要下线
if(msg.equals("bye")){
//从在线用户列表中移除当前用户
userList.remove(name);
//注销当前选择键对应的注册关系
key.cancel();
//关闭当前可选择通道
sc.close();
//发送"用户下线"通知
transmitMessage(name + " out!","--Server Info--");
}
//否则，如果接收到的用户发言信息非空（""）
else if(msg.length() > 0){
//转发用户发言信息
transmitMessage(msg,name);
}
}
}
}
//延时循环，降低服务器端处理负荷
Thread.sleep(500);
}
}catch(Exception e){
e.printStackTrace();
}
    } //转发用户发言信息
public void transmitMessage(String msg,String name){
try{
ByteBuffer buffer = ByteBuffer.wrap((name + ":" + msg).getBytes("GBK"));
Collection channels = userList.values();
SocketChannel sc;
for(Object o:channels){
sc = (SocketChannel)o;
sc.write(buffer);
buffer.flip();
}
}catch(Exception e){
e.printStackTrace();
}
    }

   //接收用户发言信息
    public String readMessage(SocketChannel sc){
String result = null;
int n = 0;
        ByteBuffer buf = ByteBuffer.allocate(1024);
try{
            n = sc.read(buf);
buf.flip();
Charset charset = Charset.forName("GBK");
CharsetDecoder decoder = charset.newDecoder();
CharBuffer charBuffer = decoder.decode(buf);
result = charBuffer.toString();
        }catch(IOException e){
e.printStackTrace();
}
return result;
    }    public static void main(String args[]){
ChatServer server = new ChatServer();
server.init();
server.start();
}
}
给楼主参考各代码

解决方案 »