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Server
Client
Complete code
Server
import java.io.IOException;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Random;
import java.util.Scanner;
public class ServerDemo {
private int flag;
public void server() throws IOException {
//创建一个服务器
System.out.println("服务端启动，等待客户端连接。。。");
PrintWriter out = null;
Scanner getClient = null;
ServerSocket server = null;
Socket client = null;
this.setFlag();
try {
server = new ServerSocket(6666);
//创建一个接收连接客户端的对象
client = server.accept();
System.out.println(client.getInetAddress() + " 已成功连接到此台服务器上。");
//字符输出流
out = new PrintWriter(client.getOutputStream()); //向客户端发送数据
out.println("欢迎来到猜数字小游戏（1-100）！！！");
out.flush();//将缓冲流中的数据全部输出
getClient = new Scanner(client.getInputStream()); //接收客户端发送的数据
//阻塞等待客户端发送消息过来
while (getClient.hasNextLine()) {
String returnMsg = null;
String tmp = getClient.nextLine();
if ("e".equals(tmp)) {
break;
} else if ("c".equals(tmp)) {
returnMsg = "欢迎来到新一轮的猜数字小游戏（1-100）！！！";
this.setFlag();
} else {
int clientInput = Integer.parseInt(tmp);
if (clientInput > flag) {
returnMsg = "你输入的数字大了！！！";
} else if (clientInput < flag) {
returnMsg = "你输入的数字小了！！！";
} else {
returnMsg = "恭喜你，猜中了！！！继续（输入c）,退出（输入e）";
}
}
out.println(returnMsg); //向客户端发送数据
out.flush();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
out.close();
getClient.close();
server.close();
}
}
// 生成随机数字
public void setFlag() {
Random r = new Random();
flag = r.nextInt(100);
System.out.println("猜数字小游戏答案：flag = " + flag);
}
public static void main(String[] args) throws IOException {
new ServerDemo().server();
}
}
Client
import java.io.IOException;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.Scanner;
public class ClientDemo {
public void client() throws IOException {
System.out.println("正在向服务器请求连接。。。");
Socket client = null;
Scanner getKey = null;
Scanner getServer = null;
PrintWriter out = null;
try {
client = new Socket("127.0.0.1", 6666);
getServer = new Scanner(client.getInputStream());
System.out.println(getServer.nextLine());
out = new PrintWriter(client.getOutputStream());
System.out.print("请输入数字：");
//先读取键盘录入方可向服务端发送消息
getKey = new Scanner(System.in);
while (getKey.hasNextLine()) {
//写到服务端的的控制台
out.println(getKey.nextLine());
out.flush();
try {
System.out.println("提示消息：" + getServer.nextLine());
System.out.print("请输入数字：");
} catch (Exception e) {
System.out.print("游戏结束！！！");
break;
}
//阻塞等待接收服务端的消息
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
getKey.close();
getServer.close();
out.close();
client.close();
}
}
public static void main(String[] args) throws IOException {
new ClientDemo().client();
}
}
