RPC:在本地调用远程的函数,远程过程调用,可以跨语言实现,httpClient
RMI:远程方法调用,Java中用于实现RPC的一种机制,RPC的Java版本是J2EE的网络调用机制,跨JVM调用对象的方法,面向对象的思维方式
RMI实现:直接或间接实现接口Java.rmi.Remote 成为存在服务器端的远程对象,供客户端访问并提供一定的服务
远程对象必须实现Java.rmi.server.uniCastRemoteObject类,这样草能保证客户端访问获得远程对象时,该远程对象将会把自身的一个拷贝以Socket的形式传输给客户端,此时客户端所获得的这个拷贝称为存根,而服务器端本身已存在的远程对象则称之为骨架,其实此时的存根时客户端的一个代理,用于与服务器端的通信,而骨架也可认为是服务器端的一个代理,用于接受客户端的请求之后调用远程方法来响应客户端的请求
java
import java.rmi.Remote;
import java.rmi.RemoteException;
public interface IService extends Remote {
String service(String content) throws RemoteException;
}
java
import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;
public class IServiceImpl extends UnicastRemoteObject implements IService {
private String name;
public IServiceImpl(String name) throws RemoteException {
this.name = name;
}
@Override
public String service(String content) {
return "server >>" + content;
}
}
java
import javax.naming.Context;
import javax.naming.InitialContext;
public class Server {
public static void main(String[] args) {
try {
IService service02 = new IServiceImpl("service02");
Context context = new InitialContext();
context.rebind("rmi://127.0.0.1/service02",service02);
} catch (Exception e) {
e.printStackTrace();
}
System.out.println("00000");
}
}
java
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
public class Client {
public static void main(String[] args) {
String url = "rmi://127.0.0.1/";
try {
Context context = new InitialContext();
IService service02 = (IService) context.lookup(url+"service02");
Class stubClass = service02.getClass();
System.out.println(service02 + "is" + stubClass.getName());
Class[] interfaces = stubClass.getInterfaces();
for (Class c : interfaces) {
System.out.println("implement" +c.getName()+ "interface");
}
System.out.println(service02.service("hello"));
} catch (Exception e) {
e.printStackTrace();
}
}
}