动态代理:可以看看这篇文章
Java远程调用-实现一个简单的服务框架:可以看这篇文章
主要通过socket通讯传递系列化的参数类型和参数,客户端定义和服务器一样的接口,服务器端要实现接口,客户端调用本地接口通过动态代理把调用的方法名称、参数类型、参数发送到服务器,服务器根据参数获取实例指定方法执行并把执行结果发送给客户端。
下面是完整代码
服务器端代码:
MethodService.java
import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.lang.reflect.Method; import java.net.ServerSocket; import java.net.Socket; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import org.omg.CosNaming.NamingContextExtPackage.AddressHelper; public class MethodService { /** * 发布服务 * * @param service * 服务实现 * @param port * 服务端口 * @throws Exception */ public static void export(final Object service, final int port) throws Exception { if (service == null) throw new IllegalArgumentException("service instance == null"); if (port <= 0 || port > 65535) throw new IllegalArgumentException("Invalid port " + port); System.out.println("Export service " + service.getClass().getName() + " on port " + port); /* 服务端socket,最多同时处理1000个服务请求 */ ServerSocket server = new ServerSocket(port, 1000); ExecutorService executor = Executors.newCachedThreadPool(); ; for (;;) { try { // 监听client socket请求 final Socket socket = server.accept(); executor.execute(new Runnable() { @Override public void run() { try { try { ObjectInputStream input = new ObjectInputStream( socket.getInputStream()); try { // 发布服务的方法名 String methodName = input.readUTF(); // 入参 Class<?>[] parameterTypes = (Class<?>[]) input .readObject(); Object[] arguments = (Object[]) input .readObject(); ObjectOutputStream output = new ObjectOutputStream( socket.getOutputStream()); try { Method method = service.getClass() .getMethod(methodName, parameterTypes); Object result = method.invoke(service, arguments); output.writeObject(result); } catch (Throwable t) { output.writeObject(t); } finally { output.close(); } } finally { input.close(); } } finally { if (socket != null) { socket.close(); } } } catch (Exception e) { e.printStackTrace(); } } }); } catch (Exception e) { e.printStackTrace(); } } } public static void main(String[] args) { Service service = new Service(); try { export(service, 1234); } catch (Exception e) { // TODO 自动生成的 catch 块 e.printStackTrace(); } } }
//远程调用的方法定义接口 interface MethodInteface{ public String sayHello(String name); public int add(int a, int b); }
//远程调用的方法定义接口实现class Service implements MethodInteface{public String sayHello(String name) {return "Hello,"+name;}public int add(int a, int b){return a+b;}}
客户端代码:
RemoteCall.java
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; interface MethodInteface{ public String sayHello(String name); public int add(int a, int b); } public class RemoteCall { public static void main(String[] args) { // TODO 自动生成的方法存根 try { MethodInteface methodInteface = refer(MethodInteface.class, "127.0.0.1", 1234); System.out.println(methodInteface.sayHello("HeRui")); System.out.println(methodInteface.add(1223, 1001)); } catch (Exception e) { // TODO 自动生成的 catch 块 e.printStackTrace(); } } /** * 引用服务 * * @param <T> * 接口泛型 * @param interfaceClass * 接口类型 * @param host * 服务器主机名 * @param port * 服务器端口 * @return 远程服务 * @throws Exception */ @SuppressWarnings("unchecked") public static <T> T refer(final Class<T> interfaceClass, final String host, final int port) throws Exception { if (interfaceClass == null) throw new IllegalArgumentException("Interface class == null"); if (!interfaceClass.isInterface()) throw new IllegalArgumentException("The " + interfaceClass.getName() + " must be interface class!"); if (host == null || host.length() == 0) throw new IllegalArgumentException("Host == null!"); if (port <= 0 || port > 65535) throw new IllegalArgumentException("Invalid port " + port); System.out.println("Get remote service " + interfaceClass.getName() + " from server " + host + ":" + port); return (T) Proxy.newProxyInstance(interfaceClass.getClassLoader(), new Class<?>[] { interfaceClass }, new InvocationHandler() { public Object invoke(Object proxy, Method method, Object[] arguments) throws Throwable { // 建立socket并尝试连接,失败则抛出异常 // Socket socket = new Socket(host, port); Socket socket = new Socket(); // socket.close()执行时 若数据没有发送完成则阻塞 10秒 socket.setSoLinger(true, 10); socket.connect(new InetSocketAddress(host, port)); try { // 往socket写数据 ObjectOutputStream output = new ObjectOutputStream(socket.getOutputStream()); try { output.writeUTF(method.getName()); output.writeObject(method.getParameterTypes()); output.writeObject(arguments); // 读出数据 ObjectInputStream input = new ObjectInputStream(socket.getInputStream()); try { Object result = input.readObject(); if (result instanceof Throwable) { throw (Throwable) result; } return result; } finally { input.close(); } } finally { if (output != null) { output.close(); } } } finally { if (socket != null) { socket.close(); } } } }); } }