网络编程_参考答案

1、编写一服务器端程序,实现读取客户端发送过来的一组整数,表现为一组数与数之间用空格隔开的字符串。

对这组整数进行排序处理后,返回相应的字符串给客户端,如果数据格式不正确,则返回错误信息,以本机作为服务器。

public class Server {public static void main(String[] args) {BufferedReader br = null;String clientStr="";try {//创建一个监听的端口ServerSocket ss = new ServerSocket(3838);Socket s = null;System、out、println("服务器启动、、、");//接受客户端通信请求,并建立专用通信端口s = ss、accept();System、out、println("有客户端发送请求");Send send = new Send(s);Thread t1 = new Thread(send);t1、start();while(true){//获取客户端通信的信息br = new BufferedReader(new InputStreamReader(s、getInputStream()));clientStr = br、readLine();System、out、println("客户端:"+clientStr);}} catch (IOException e) {e、printStackTrace();}}}public class Client {public static void main(String[] args) {BufferedReader br = null;String clientStr="";try {//建立通信端口,并向服务器端发送通信请求Socket s = new Socket("127、0、0、1",3838);System、out、println("与服务器端建立连接");Send send = new Send(s);Thread t1 = new Thread(send);t1、start();while(true){//获取客户端通信的信息br = new BufferedReader(new InputStreamReader(s、getInputStream()));clientStr = br、readLine();System、out、println("服务器端说:"+clientStr);}} catch (UnknownHostException e) {// TODO Auto-generated catch blocke、printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke、printStackTrace();}}}public class Send implements Runnable{Socket s ;Scanner in = new Scanner(System、in);BufferedReader br= new BufferedReader(new InputStreamReader(System、in));public Send(Socket s){this、s = s;}public void run() {// TODO Auto-generated method stubPrintWriter out = null;try {while(true){out = new PrintWriter(new OutputStreamWriter(s、getOutputStream()),true);String str = in、next();//br、readLine();out、println(str);}} catch (Exception e) {// TODO Auto-generated catch blocke、printStackTrace();}finally{out、close();}}}4、编写一个简单的socket通讯程序:1)、客户机程序,从控制台输入字符串,发送到服务器端,并将服务器返回的信息显示出来。

2)、服务器端程序,从客户机接收数据并打印,同时将从标准输入获取的信息发送给客户机3)、满足一个服务器可以服务多个客户实现效果如图:图1:服务器端效果:图2:客户器端效果:public class Server {static List<Socket> l = new ArrayList<Socket>();public static void main(String[] args) {try {ServerSocket so =new ServerSocket(4001);System、out、println("服务器启动、、、");while(true){Socket s = so、accept();System、out、println(s、getInetAddress()+"发送请求");l、add(s);One o = new One();Thread t = new Thread(o);t、start();}} catch (IOException e) {// TODO Auto-generated catch blocke、printStackTrace();}}}public class One implements Runnable {public void run() {Socket s = Server、l、get(Server、l、size() - 1);String str = "";SendAll sendAll = new SendAll();Thread t1 = new Thread(sendAll);t1、start();try {while (true) {BufferedReader br = new BufferedReader(new InputStreamReader(s、getInputStream()));str = br、readLine();System、out、println("客户端"+ s、getInetAddress() + "说:" + str);}} catch (IOException e) {// TODO Auto-generated catch blockSystem、out、println(s、getInetAddress() + "用户下线");Server、l、remove(s);}}}public class SendAll implements Runnable{Scanner in = new Scanner(System、in);BufferedReader br= new BufferedReader(new InputStreamReader(System、in));public void run(){PrintWriter out = null;try {while(true){String str =br、readLine();for(Socket s:Server、l){out = new PrintWriter(new OutputStreamWriter(s、getOutputStream()),true);out、println(str);}}} catch (Exception e) {// TODO Auto-generated catch blocke、printStackTrace();}finally{out、close();}}}public class Client {public static void main(String[] args) {BufferedReader br = null;String clientStr="";try {//建立通信端口,并向服务器端发送通信请求Socket s = new Socket("127、0、0、1",4001);System、out、println("与服务器端建立连接");Send send = new Send(s);Thread t1 = new Thread(send);t1、start();while(true){//获取客户端通信的信息br = new BufferedReader(new InputStreamReader(s、getInputStream()));clientStr = br、readLine();System、out、println("服务器端说:"+clientStr);}} catch (UnknownHostException e) {// TODO Auto-generated catch blocke、printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke、printStackTrace();}}}public class Send implements Runnable{Socket s ;Scanner in = new Scanner(System、in);BufferedReader br= new BufferedReader(new InputStreamReader(System、in));public Send(Socket s){this、s = s;}public void run() {// TODO Auto-generated method stubPrintWriter out = null;try {while(true){out = new PrintWriter(new OutputStreamWriter(s、getOutputStream()),true);String str =br、readLine();out、println(str);}} catch (Exception e) {// TODO Auto-generated catch blocke、printStackTrace();}finally{out、close();}}}。