RPC例子
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2022-06-01 21:31:46
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首先,定义业务:
package com.service;
public interface HelloService {
String sayHi(String name);
}
package com.service.impl;
import com.service.HelloService;
public class HelloServiceImpl implements HelloService{
@Override
public String sayHi(String name) {
return "测试 ,"+name;
}
}
服务端通信代码
package com.server;
import java.io.IOException;
public interface Server {
void stop();
public void start() throws IOException;
public void register(Class serviceInterface, Class impl);
public boolean isRunning();
public int getPort();
}
package com.server.impl;
import com.server.Server;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.Method;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.HashMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
public class ServiceCenter implements Server{
private static ExecutorService executor = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());
private static final HashMap<String, Class> serviceRegistry = new HashMap<String, Class>();
private static boolean isRunning = false;
private static int port;
public ServiceCenter(int port) {
this.port = port;
}
@Override
public void stop() {
isRunning = false;
executor.shutdown();
}
@Override
public void start() throws IOException {
ServerSocket server = new ServerSocket();
server.bind(new InetSocketAddress(port));
System.out.println("启动--Server");
try {
while (true) {
// 1.监听客户端的TCP连接,接到TCP连接后将其封装成task,由线程池执行
executor.execute(new ServiceTask(server.accept()));
}
} finally {
server.close();
}
}
@Override
public void register(Class serviceInterface, Class impl) {
serviceRegistry.put(serviceInterface.getName(), impl);
}
@Override
public boolean isRunning() {
return isRunning;
}
@Override
public int getPort() {
return port;
}
private static class ServiceTask implements Runnable {
Socket clent = null;
public ServiceTask(Socket client) {
this.clent = client;
}
@Override
public void run() {
ObjectInputStream input = null;
ObjectOutputStream output = null;
try {
// 2.将客户端发送的码流反序列化成对象,反射调用服务实现者,获取执行结果
input = new ObjectInputStream(clent.getInputStream());
String serviceName = input.readUTF();
String methodName = input.readUTF();
Class<?>[] parameterTypes = (Class<?>[]) input.readObject();
Object[] arguments = (Object[]) input.readObject();
Class serviceClass = serviceRegistry.get(serviceName);
if (serviceClass == null) {
throw new ClassNotFoundException(serviceName + " not found");
}
Method method = serviceClass.getMethod(methodName, parameterTypes);
Object result = method.invoke(serviceClass.newInstance(), arguments);
// 3.将执行结果反序列化,通过socket发送给客户端
output = new ObjectOutputStream(clent.getOutputStream());
output.writeObject(result);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (output != null) {
try {
output.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (input != null) {
try {
input.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (clent != null) {
try {
clent.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
}
服务端启动类
package com.start;
import com.service.HelloService;
import com.service.impl.HelloServiceImpl;
import com.server.Server;
import com.server.impl.ServiceCenter;
import java.io.IOException;
public class ServerStart {
public static void main(String[] args) throws IOException {
new Thread(new Runnable() {
@Override
public void run() {
try {
Server serviceServer = new ServiceCenter(8088);
serviceServer.register(HelloService.class, HelloServiceImpl.class);
serviceServer.start();
} catch (IOException e) {
e.printStackTrace();
}
}
}).start();
}
}
客户端:需要引用业务接口代码 ,就是把服务端的接口打成jar包,注意!包的结构得一致;例如:服务端的业务代码包为:com.service.XxService.java ,所以jar包的结构也要这样
客户端通信代码
package com.client;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.net.InetSocketAddress;
import java.net.Socket;
public class RPCClient<T> {
@SuppressWarnings("unchecked")
public static <T> T getRemoteProxyObj(final Class<?> serviceInterface, final InetSocketAddress addr) {
// 1.将本地的接口调用转换成JDK的动态代理,在动态代理中实现接口的远程调用
return (T) Proxy.newProxyInstance(serviceInterface.getClassLoader(), new Class<?>[]{serviceInterface},
new InvocationHandler() {
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
Socket socket = null;
ObjectOutputStream output = null;
ObjectInputStream input = null;
try {
// 2.创建Socket客户端,根据指定地址连接远程服务提供者
socket = new Socket();
socket.connect(addr);
// 3.将远程服务调用所需的接口类、方法名、参数列表等编码后发送给服务提供者
output = new ObjectOutputStream(socket.getOutputStream());
output.writeUTF(serviceInterface.getName());
output.writeUTF(method.getName());
output.writeObject(method.getParameterTypes());
output.writeObject(args);
// 4.同步阻塞等待服务器返回应答,获取应答后返回
input = new ObjectInputStream(socket.getInputStream());
return input.readObject();
} finally {
if (socket != null){
socket.close();}
if (output != null){
output.close();}
if (input != null){
input.close();}
}
}
});
}
}
客户端测试远程调用
package com.test;
import com.client.RPCClient;
import com.service.HelloService;
import java.io.IOException;
import java.net.InetSocketAddress;
public class RpcClientTest {
public static void main(String[] args) throws IOException {
for (int i=0;i<100;i++){
HelloService service = RPCClient
.getRemoteProxyObj(HelloService.class, new InetSocketAddress("192.168.3.63", 8088));
System.out.println(service.sayHi("客户端传入的调用参数, ")+i);
}
}
}
运行结果:
备注:1、服务端的启动运行是用的 Java线程,线程会一直开启,客户端可以一直调用服务端的方法;2、服务端代码可以放在本机运行,也可以放在别的电脑上运行,需要更改代码中的IP地址,经过测试,放在本机的速度远远快于放在别的电脑上运行
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