Java远程方法调用，即Java RMI（Java Remote Method Invocation）是Java编程语言里，一种用于实现远程过程调用的应用程序编程接口。它使客户机上运行的程序可以调用远程服务器上的对象。远程方法调用特性使Java编程人员能够在网络环境中分布操作。RMI全部的宗旨就是尽可能简化远程接口对象的使用。
Java RMI极大地依赖于接口。在需要创建一个远程对象的时候，程序员通过传递一个接口来隐藏底层的实现细节。客户端得到的远程对象句柄正好与本地的根代码连接，由后者负责透过网络通信。这样一来，程序员只需关心如何通过自己的接口句柄发送消息。
服务端新建接口：
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import java.rmi.Remote; import java.rmi.RemoteException; public interface RmiTestInterface extends Remote{ public String getTest() throws RemoteException; } |
接口的实现：
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import java.rmi.RemoteException; public class RmiTestImpl implements RmiTestInterface { public RmiTestImpl() throws RemoteException { //super(); // TODO Auto-generated constructor stub //UnicastRemoteObject.exportObject(this); } /** * */ public String getTest() throws RemoteException { // TODO Auto-generated method stub return "Hello，Test"; } } |
定义一个main方法，注册你已经实现的RMI接口，包括开放端口等：
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public static void main(String []args) throws AlreadyBoundException, RemoteException{ RmiTestImpl t=new RmiTestImpl(); RmiTestInterface tt=(RmiTestInterface)UnicastRemoteObject.exportObject(t,0); // Bind the remote object's stub in the registry Registry registry = LocateRegistry.createRegistry(2001); registry.rebind("test", tt); System.out.println("server is start"); } |
Server端的代码已经全部写完，但是还要把接口类（RmiTestInterface）打包成jar，导入进client端的项目中。
运行服务端后控制台输出：
server is start
导入服务端的接口jar以后，可以开始编写一个client端的主程序：
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public static void main(String []args){ try { Registry registry = LocateRegistry.getRegistry("localhost",2001); RmiTestInterface t= (RmiTestInterface) registry.lookup("test"); System.out.println("client:"+t.getTest()); } catch (RemoteException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (NotBoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } } |
运行客户端main方法后，控制台输出：
Hello，Test
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AfrikaansAlbanianArabicArmenianAzerbaijaniBasqueBengaliBelarusianBulgarianCatalanChinese (Simp)Chinese (Trad)CroatianCzechDanishDutchEnglishEsperantoEstonianFilipinoFinnishFrenchGalicianGeorgianGermanGreekGujaratiHaitian CreoleHebrewHindiHungarianIcelandicIndonesianIrishItalianJapaneseKannadaKoreanLaoLatinLatvianLithuanianMacedonianMalayMalteseNorwegianPersianPolishPortugueseRomanianRussianSerbianSlovakSlovenianSpanishSwahiliSwedishTamilTeluguThaiTurkishUkrainianUrduVietnameseWelshYiddish |
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