Java如何通过Socket实现TCP服务端
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Socket 通常也称作“套接字”,Java如何通过Socket实现TCP服务端?下面本站小编带大家一起来看看详细内容,希望对大家有所帮助!想了解更多相关信息请持续关注我们应届毕业生考试网!
1 Java Socket简介
所谓socket 通常也称作”套接字“,用于描述IP地址和端口,是一个通信链的句柄。应用程序通常通过”套接字”向网络发出请求或者应答网络请求。Socket和ServerSocket类库位于包中。ServerSocket用于服务器端,Socket是建立网络连接时使用的。在连接成功时,应用程序两端都会产生一个Socket实例,操作这个实例,完成所需的会话。对于一个网络连接来说,套接字是平等的,并没有差别,不因为在服务器端或在客户端而产生不同级别。
2 TCPServer代码实例
import ception;
import tStream;
import utStream;
import erSocket;
import et;
import ;
import Map;
import ;
import er;
import erFactory;
/**
* TCP服务器端,单例模式
* @author xiang
*
*/
public class TCPServer implements Runnable {
private static final Logger logger = ogger(s);
//成员变量/
private static TCPServer serverInstance;
private static Map<String, SocketThread> socketMaps = new HashMap<String,SocketThread>(); //每个客户端连接时都会新建一个SocketThread与之对应 private static ServerSocket serverSocket; //服务器套接字
private static int serPort = 9999; //服务器端口号
private static boolean flag; //服务器状态标志
private static final int BUFFER_SIZE = 512; //数据接收字符数组大小
//构造函数/
private TCPServer() {
}
/**
* 获取实例
* @return TCPServer实例serverInstance
*/
public static TCPServer getServerInstance(){
if(serverInstance==null)
serverInstance = new TCPServer();
return serverInstance;
}
/**
* 开启服务器
* @throws IOException
*/
public void openTCPServer() throws IOException{ if(serverSocket==null || osed()){
serverSocket = new ServerSocket(serPort);
flag = true;
}
}
/**
* 关闭服务器
* @throws IOException
*/
public void closeTCPServer() throws IOException{
flag = false; if(serverSocket!=null)
e();
/*for (y<String, SocketThread> entry : ySet()) {
tln("Key = " + ey() + ", Value = " + alue());
} */
for (SocketThread value : es())
eConnect();
r();
}
/**
* 服务器向客户端发送数据
* @param bytes[]:待发送的字符数组
* @param key 客户端的key,为空或""时表示数据群发
* @throws IOException
*/
public void sendMessage(String key,byte[] msgBytes){
if(key==null||ls("")){
for (SocketThread value : es())
Massage(msgBytes);
}else{
SocketThread thread = (key);
if(thread!=null)
Massage(msgBytes);
}
}
/**
* 服务器向客户端发送数据
* @param key 客户端的`key,为空或""时表示数据群发
* @param msgStr:待发送的字符串
* @throws IOException
*/
public void sendMessage(String key,String msgStr){ byte[] sendByte = ytes();
if(key==null||ls("")){
for (SocketThread value : es())
Massage(sendByte);
}else{
SocketThread thread = (key);
if(thread!=null)
Massage(sendByte);
}
}
@Override
public void run() {
("服务器线程已经启动"); while(true){
try {
while(flag){
("服务器线程在监听状态中");
Socket socket = pt();
String key = emoteSocketAddress()ring();
SocketThread thread = new SocketThread(socket,key);
t();
(key, thread);
("有客户端连接:"+key);
}
} catch (Exception e) {
tStackTrace();
}
}
}
/**
* 处理连接后的数据接收请求内部类
* @author xiang
*
*/
private class SocketThread extends Thread{
private Socket socket;
private String key;
private OutputStream out;
private InputStream in;
//构造函数
public SocketThread(Socket socket,String key) {
et = socket;
= key;
}
/**
* 发送数据
* @param bytes
* @throws IOException
*/
public void sendMassage(byte[] bytes){
try {
if(out==null)
out = utputStream();
e(bytes);
} catch (Exception e) {
tStackTrace();
try {
closeConnect();
} catch (IOException e1) {
tStackTrace();
}
ve(key);
}
}
/**
* 关闭连接,释放资源
* @throws IOException
*/
public void closeConnect() throws IOException{
if(out!=null) e();
if(in!=null) e();
if(socket!=null && nnected()) e();
}
@Override
public void run() {
byte[] receivBuf = new byte[BUFFER_SIZE];
int recvMsgSize;
try {
in = nputStream();
out = utputStream();
while ((recvMsgSize = (receivBuf)) != -1) {
String receivedData = new String(receivBuf, 0, recvMsgSize);
tln("Reverve form[port" + ort() + "]:" + receivedData);
tln("Now the size of socketMaps is" + ());
/**************************************************************
*
* 接收数据后的处理过程
*
**************************************************************/
}
// response to client
byte[] sendByte = "The Server has received"ytes();
// e(sendByte, 0, th);
e(sendByte);
tln("To Cliect[port:" + ort() + "] 回复客户端的消息发送成功");
closeConnect();
ve(key);
} catch (Exception e) {
tStackTrace();
try {
closeConnect();
} catch (IOException e1) {
tStackTrace();
}
}
}
//////////////
public int getport(){
return ort();
}
}
//. end SocketThread
}
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