题目
实现一个支持并发服务的 网络 运算 服务器程序。该服务器能够同时接收来自于多个客户端的运算请求,然后根据运算类型和请求参数完成实际的运算,最后把运算结果返回给客户端。
客户端
import java.io.IOException;
import java.net.*;
public class Client {
private DatagramSocket datagramSocket;
private InetAddress address ;
private int port;
public Client(){
this(18888,"127.0.0.1");
}
public Client(int port, String netAddress){
try {
this.port=port;
datagramSocket = new DatagramSocket(); //发送端口可以不指定
address=InetAddress.getByName(netAddress);
} catch (SocketException e) {
e.printStackTrace();
} catch (UnknownHostException e) {
e.printStackTrace();
}
}
public void send(String requestParam) {
try {
DatagramPacket datagramPacket = new DatagramPacket(requestParam.getBytes(), requestParam.length(),address,port);
datagramSocket.send(datagramPacket);
String[] str =requestParam.split("\n");
System.out.print("send: ");
for(String s:str){
System.out.print(s+" ");
}
System.out.println();
byte[] receiveBuff = new byte[1024];
DatagramPacket receivePaket = new DatagramPacket(receiveBuff,receiveBuff.length);
datagramSocket.receive(receivePaket);
String receiveParam = new String(receivePaket.getData(),0,receivePaket.getLength());
System.err.println("receive :"+receiveParam);
System.out.println();
} catch (SocketException | UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
Client client = new Client();
Runnable runnable = new Runnable() {
@Override
public void run() {
for (int i = 3; i < 5; ++i) {
for (int j = 3; j < 5; ++j) {
StringBuilder sb = new StringBuilder();
sb.append("x\n");
sb.append(i);
sb.append("\n");
sb.append(j);
sb.append("\n");
client.send(sb.toString());
}
}
}
};
for(int i=0;i<3;++i){
new Thread(runnable).start();
}
}
}
服务端
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.atomic.AtomicInteger;
public class Server {
private static final int PORT=18888;
private static final int MAX_LENGTH=1024;
private DatagramSocket datagramSocket;
/**
* 记录响应次数,线程安全用原子变量保证
*/
private AtomicInteger modCount;
private LinkedBlockingQueue<DatagramPacket> receiveQueue;
private LinkedBlockingQueue<DatagramPacket> responseQueue;
public Server(){
try {
datagramSocket = new DatagramSocket(PORT);
receiveQueue = new LinkedBlockingQueue<DatagramPacket>();
responseQueue = new LinkedBlockingQueue<DatagramPacket>();
modCount = new AtomicInteger(0);
} catch (SocketException e) {
e.printStackTrace();
}
}
/**
* 接收线程,监听端口,收到数据包后直接放到接收队列
*/
private void startReceive(){
System.out.println("接收开启");
//三个接收线程
for(int i=0;i<3;++i){
new Thread(()->{
while(true){
//阻塞接收, 收到后就放入队列
byte[] buffer =new byte[MAX_LENGTH];
DatagramPacket receivePacket = new DatagramPacket(buffer,buffer.length);
try {
datagramSocket.receive(receivePacket);
receiveQueue.put(receivePacket);
} catch (IOException | InterruptedException e) {
e.printStackTrace();
}
}
},"receiveThread").start();
}
}
/**
* 处理线程,从接收队列取数据包,计算后封装新的包放入发送队列
*/
private void startProcess(){
System.out.println("处理开启");
//开3个处理线程
for(int i=0; i<3 ;++i){
new Thread(()->{
while(true){
DatagramPacket receivePacket=null;
try {
//阻塞式取数据
receivePacket = receiveQueue.take();
} catch (InterruptedException e) {
e.printStackTrace();
}
String parameter = new String(receivePacket.getData(),0,receivePacket.getLength());
String[] opers = parameter.split("\n");
double num1 = Double.parseDouble(opers[1]);
double num2 = Double.parseDouble(opers[2]);
//System.out.println(num1 +" "+opers[0]+" "+num2);
double res =0;
switch(opers[0]){
case "+" :
res = num1+num2;
break;
case "-":
res=num1-num2;
break;
case "x":
res=num1*num2;
break;
case "/":
res=num1/num2;
break;
}
//在原来的数据包上修改一下,省得再new一个
receivePacket.setData((res+"").getBytes());
try {
//放入相应队列
responseQueue.put(receivePacket);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}).start();
}
}
/**
* 从发送队列取数据包,发出去
*/
private void startResponse(){
System.out.println("响应开启");
//开三个发送线程
for(int i=0;i<3;++i){
new Thread(()->{
while(true){
try {
DatagramPacket responsePacket = responseQueue.take();
datagramSocket.send(responsePacket);
} catch (InterruptedException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("响应: "+ modCount.addAndGet(1));
//addModCount(); //modCount+1
}
},"responseThread").start();
}
}
/**
* 不知道在哪里关socket了,,就放这里吧 垃圾回收的时候关233333
*/
protected void finalize(){
if(datagramSocket!=null){
datagramSocket.close();
}
}
public static void main(String[] args) {
Server server = new Server();
server.startResponse();
server.startProcess();
server.startReceive();
}
}
来源:CSDN
作者:北1111
链接:https://blog.csdn.net/liu432linux/article/details/104817400