项目通信之RPC调用——java简单实现
微服务项目通信方法很多，有像springcloud解决方案的http通信，还有像阿里Dubbo的RPC通信，这里简单实现RPC调用。一共2个端，客户端server和客户端client.项目demo很简单，就不多讲了，看代码好了。
下面是服务端的demo，直接main函数启动。
package com.alvis.rpcserverdemo.server;
/**
* @author ALvis
* @ctreate 2020/1/3
*/
import java.io.IOException;
/**
* RPC--服务端基本方法
*/
public interface Server {
/**
* Socket 端口
*/
int PORT = 8111;
/**
* 启动服务端
*/
void start() throws IOException;
/**
* 停止服务端
*/
void stop();
/**
* 服务注册
* @param serviceInterface -- 对外暴露服务接口
* @param impl -- 内部实现类
*/
void regist(Class serviceInterface, Class impl);
}
package com.alvis.rpcserverdemo.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.ArrayBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
/**
* @author ALvis
* @ctreate 2020/1/3
*/
public class ServerCenter implements Server {
/**
* 线程池 接收客户端调用
*/
private static ThreadPoolExecutor executor = new ThreadPoolExecutor(5, 20, 200, TimeUnit.MILLISECONDS,new ArrayBlockingQueue(10));
/**
* 服务注册缓存
*/
private static final HashMap> serviceRegistry = new HashMap>();
/**
* 启动服务
*/
@Override
public void start() throws IOException {
ServerSocket server = new ServerSocket();
server.bind(new InetSocketAddress(PORT));
try {
for (;;) {
executor.execute(new ServiceTask(server.accept()));
}
} finally {
server.close();
}
}
/**
* 停止服务
*/
@Override
public void stop() {
executor.shutdown();
}
/**
* 注册服务
*/
@Override
public void regist(Class serviceInterface, Class impl) {
serviceRegistry.put(serviceInterface.getName(), impl);
}
/**
*服务具体调度--对象流反序列化，反射调用本地服务，并输出结果到客户端
*/
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 {
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();
}
}
}
}
}
}
package com.alvis.rpcserverdemo.server;
/**
* @author ALvis
* @ctreate 2020/1/3
*/
public interface IRpcService {
}package com.alvis.rpcserverdemo.server;
/**
* @author ALvis
* @ctreate 2020/1/3
*/
public interface IHelloService extends IRpcService{
String sayHi(String name, String msg);
}
package com.alvis.rpcserverdemo.server;
/**
* @author ALvis
* @ctreate 2020/1/3
*/
public class HelloServiceImpl implements IHelloService {
private static final long serialVersionUID = 1L;
@Override
public String sayHi(String name, String msg) {
System.out.println(name+"调用");
return new StringBuffer().append("hi~! ").append(name).append(",").append(msg).toString();
}
}
package com.alvis.rpcserverdemo.server;
import java.io.IOException;
/**
* @author ALvis
* @ctreate 2020/1/3
*/
public class ServerTest {
public static void main(String[] args) throws IOException {
System.out.println("服务启动1");
ServerCenter s = new ServerCenter();
System.out.println("服务启动2");
s.regist(IHelloService.class, HelloServiceImpl.class);
System.out.println("服务启动3");
s.start();
System.out.println("服务关闭");
}
}
下面是客户端，也是main函数启动
package com.alvis.rpcserverdemo.server;
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;
/**
* @author ALvis
* @ctreate 2020/1/3
*/
public class Client {
/**
* 客户端代理获取远程服务对象
* @param serviceInterface
* @param addr
* @return
*/
@SuppressWarnings("unchecked")
public static T getRemoteProxyObj(final Class serviceInterface, final InetSocketAddress addr){
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 {
// 1.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);
// 2.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);
// 3.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();
}
}
});
}
}
package com.alvis.rpcserverdemo.server;
/**
* @author ALvis
* @ctreate 2020/1/3
*/
public interface IRpcService {
}
package com.alvis.rpcserverdemo.server;
/**
* @author ALvis
* @ctreate 2020/1/3
*/
public interface IHelloService extends IRpcService{
String sayHi(String name, String msg);
}
package com.alvis.rpcserverdemo.server;
import java.io.IOException;
import java.net.InetSocketAddress;
/**
* @author ALvis
* @ctreate 2020/1/3
*/
public class RpcTest {
public static void main(String[] args) throws IOException {
IHelloService service = Client.getRemoteProxyObj(IHelloService.class, new InetSocketAddress("localhost", 8111));
System.out.println(service.sayHi("alvis", "hello 新年好!"));
}
}