javasocket客户端

Ⅰ java socket 客户端设置未接收到数据的超时问题

建议如果是长时间没有收到数据的话，或者是不想长时间等待的话，都可以通过设置超时时间来进行断开连接，之后继续处理逻辑（设置socket的setSoTimeout方法实现即可，时间单位是毫秒）：

packagesocket;
importjava.io.ByteArrayOutputStream;
importjava.io.InputStream;
importjava.net.InetSocketAddress;
importjava.net.ServerSocket;
importjava.net.Socket;
importjava.net.SocketAddress;
importjava.net.SocketException;
importjava.net.SocketTimeoutException;
importjava.text.SimpleDateFormat;
importjava.util.Arrays;
importjava.util.Date;
publicclassSocketService{
	publicstaticvoidmain(String[]args){
		try{
			SocketAddressaddress=newInetSocketAddress("192.168.9.155",3000);
			//启动监听端口8001
			ServerSocketss=newServerSocket();
			ss.bind(address);
			//接收请求
			Sockets=ss.accept();
			newThread(newT(s)).start();
		}catch(Exceptione){
			e.printStackTrace();
		}
	}
}
classTimplementsRunnable{
	publicvoidrun(){
		try{
			System.out.println(socket.toString());
			socket.setKeepAlive(true);
			socket.setSoTimeout(5*1000);
			String_pattern="yyyy-MM-ddHH:mm:ss";
			SimpleDateFormatformat=newSimpleDateFormat(_pattern);
			while(true){
				System.out.println("开始："+format.format(newDate()));
				try{
					InputStreamips=socket.getInputStream();
					ByteArrayOutputStreambops=newByteArrayOutputStream();
					intdata=-1;
					while((data=ips.read())!=-1){
						System.out.println(data);
						bops.write(data);
					}
					System.out.println(Arrays.toString(bops.toByteArray()));
				}catch(SocketTimeoutExceptione){
					e.printStackTrace();
				}catch(SocketExceptione){
					e.printStackTrace();
				}catch(Exceptione){
					e.printStackTrace();
				}
				Thread.sleep(1000);
				System.out.println(socket.isBound());//是否邦定
				System.out.println(socket.isClosed());//是否关闭
				System.out.println(socket.isConnected());//是否连接
				System.out.println(socket.isInputShutdown());//是否关闭输入流
				System.out.println(socket.isOutputShutdown());//是否关闭输出流
				System.out.println("结束："+format.format(newDate()));
			}
		}catch(Exceptione){
			e.printStackTrace();
		}
	}
	privateSocketsocket=null;
	publicT(Socketsocket){
		this.socket=socket;
	}
	publicSocketgetSocket(){
		returnsocket;
	}
	publicvoidsetSocket(Socketsocket){
		this.socket=socket;
	}
}

Ⅱ socket java实现客户端多线程接受消息并发送消息给服务器，并发执行

客服端：
package MyKeFudaun;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.Socket;
import java.net.UnknownHostException;

public class KeFuDuan {
public static void main(String[] args) {
KeFuDuan kf = new KeFuDuan();
kf.start();
}
public void start(){
Socket sco;
String ss= "";
try {
sco = new Socket("127.0.0.1",8866);
KeFuanJie kf = new KeFuanJie(sco);
KeFuWuFasong kfs = new KeFuWuFasong(sco);
kf.start();
kfs.start();

//sco.close();
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

class KeFuanJie extends Thread{

Socket soc;
String ss;
BufferedReader br;
public KeFuanJie(Socket soc){
try {
this.soc = soc;
br = new BufferedReader(new InputStreamReader(soc.getInputStream()));

} catch (IOException e) {
e.printStackTrace();
}

}

//负责接受服务端来的信息
public void run(){
while(true){
//接受服务器端来的信息
try {
ss = br.readLine();
System.out.println("服务器---->客服端： "+ss);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

}
}

//向服务器发送东西
class KeFuWuFasong extends Thread{

Socket soc;
BufferedWriter bw;
BufferedReader brr;
public KeFuWuFasong(Socket soc){

this.soc = soc;

try {
brr =new BufferedReader(new InputStreamReader(System.in));
bw = new BufferedWriter(new OutputStreamWriter(soc.getOutputStream()));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

public void run(){
while(true){
//向服务器发送请求
try {
bw.write(brr.readLine());
bw.newLine();
bw.flush();// 或者用bw.close()
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}

服务器端：
package MyKeFudaun;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {

public static void main(String[] args) {
Server server = new Server();
server.start();
}

public void start(){

try { //服务器端打开端口
ServerSocket server = new ServerSocket(4499);
Socket socket = null;
ServerToClientThread stct = null;

while(true){
socket = server.accept(); //迎接（接收）客户端的Socket访问
stct = new ServerToClientThread(socket); //分配一个新线程负责和信赖的Socket沟通
stct.start();
}

} catch (IOException e) {
e.printStackTrace();
}

}

}

package MyKeFudaun;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;

public class ServerReceiveFromClient extends Thread{

Socket socket;
BufferedReader br;
String s;

public ServerReceiveFromClient(Socket socket){
this.socket = socket;
try {
br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
} catch (IOException e) {
e.printStackTrace();
}
}

public void run(){

while(true){
try {
s = br.readLine();
System.out.println(socket.getInetAddress().getHostAddress()+"发送了:"+s);

} catch (Exception e) {
e.printStackTrace();
}

}
}
}

package MyKeFudaun;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.Socket;

public class ServerToClientThread extends Thread{

Socket socket;
BufferedReader br;
BufferedWriter bw;
String s;

//建立的同时，和客户端的Socket建立输入、输出流
public ServerToClientThread(Socket socket){
this.socket = socket;
try {
bw = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
} catch (IOException e) {
e.printStackTrace();
}

}

public void run(){
ServerReceiveFromClient srfc = new ServerReceiveFromClient(socket);
srfc.start();

while(true){
try {
bw.write("欢迎光临。");
bw.newLine();
bw.flush();
Thread.sleep(10*1000);
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}

Ⅲ java socket 客户端是如何向服务器端发送消息的

服务器端和客户端都是通过SOCKET来进行通信的,首先产生一个 socket实例,通过这个实例,服务器端调用accept这个方法接收来自客户端发送的信息.但是在产生socket实例的时候必须初始化一个端口.用来负责接受客户端的请求！
客户端要给服务器发送消息也必须产生一个socket实例，初始化的时候必须指定服务器的IP地址，并且指定服务接收的端口号,这样客户端才能找到服务器要接收的地方，找到地方就可以发送过去了。和你写信一样。找到地址
BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));

PrintWriter out = new PrintWriter(socket.getOutputStream());

BufferedReader wt = new BufferedReader(new InputStreamReader(System.in));
这个只是用来获取一个从键盘的一个流.传送给服务器端的数据都是通过流来表示的。意思是是键盘输入的一个字节转化成字符流.并输出或者写入！

Ⅳ Java Socket中服务器断开后,客户端为什么没有抛异常

在客户端退出之后，会出现socket连接中断，此时是会抛出异常，在抛出异常时打印中断的客户端即可。
1. while(Binput.read()!= -1) 这种方法能判断出客户端输入是否为空,客户端断开能跳出死循环,但是得到的数据却从第二个开始了,所以这方法不适宜。
2. 在死循环中加入以下代码：
try {
socket.sendUrgentData(0);
} catch (IOException e) {
done= false; //如果抛出了异常，那么就是断开连接了 跳出无限循环
}