Java remote Invoke

最新推荐文章于 2024-07-01 07:45:00 发布

扫地僧007

最新推荐文章于 2024-07-01 07:45:00 发布

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分类专栏： Java remote Invoke 文章标签： java

本文链接：https://blog.youkuaiyun.com/hougechuanqi/article/details/83974302

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本文介绍了一种基于Java反射机制实现的远程方法调用(RMI)技术，通过客户端和服务端的具体实现，展示了如何进行远程对象注册、方法调用及结果返回的过程。

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Util Class:

public class Call implements Serializable{

/**

* 表示类名或者接口名

*/

private String className;

/**

* 表示方法名

*/

private String methodName;

/**

* 表示方法参数类型

*/

private Class[] paramType;

/**

* 表示参数值

*/

private Object[] params;

/**

* 表示方法执行结果如果方法正常执行，则返回正常值，如果抛出异常则返回该异常

*/

private Object result;

/**

* 无参构造方法

*/

public Call() {

}

/**

* 有参构造方法

*

* @param clasName

* @param methodName

* @param paramType

* @param params

*/

public Call(String className, String methodName, Class[] paramType,

Object[] params) {

this.className = className;

this.methodName = methodName;

this.paramType = paramType;

this.params = params;

}

public String getClassName() {

return className;

}

public void setClassName(String className) {

this.className = className;

}

public String getMethodName() {

return methodName;

}

public void setMethodName(String methodName) {

this.methodName = methodName;

}

public Class[] getParamType() {

return paramType;

}

public void setParamType(Class[] paramType) {

this.paramType = paramType;

}

public Object[] getParams() {

return params;

}

public void setParams(Object[] params) {

this.params = params;

}

public Object getResult() {

return result;

}

public void setResult(Object result) {

this.result = result;

}

@Override

public String toString() {

return "ClassName=" + className + ";methodName=" + methodName;

}

}

SocketServer:

package com.hou.server;

import java.io.InputStream;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.io.OutputStream;

import java.lang.reflect.Method;

import java.net.ServerSocket;

import java.net.Socket;

import java.util.HashMap;

import java.util.Map;

import com.hou.service.impl.HelloServiceImpl;

import com.hou.util.Call;

public class SimplServer {

/**

* 存放远程对象的缓存

*/

private Map remoteObjecs = new HashMap();

/**

* 存放远程对象到缓存中

*

* @param className

* @param remoteObject

*/

public void register(String className, Object remoteObject) {

remoteObjecs.put(className, remoteObject);

}

public void service() throws Exception {

ServerSocket server = new ServerSocket(8000);

System.out.println("服务器启动...");

while (true) {

Socket socket = server.accept();

InputStream inputStream = socket.getInputStream();

ObjectInputStream ois = new ObjectInputStream(inputStream);

OutputStream out = socket.getOutputStream();

ObjectOutputStream oos = new ObjectOutputStream(out);

Call call = (Call) ois.readObject();

System.out.println("读取Obj=" + call);

call = this.invoke(call);

oos.writeObject(call);

ois.close();

oos.close();

socket.close();

}

}

/**

* Invoke execute method

*

* @param call

* @return

*/

public Call invoke(Call call) {

Object result = null;

try {

String className = call.getClassName();

String methodName = call.getMethodName();

Object[] params = call.getParams();

// 注册一个类

Class classType = Class.forName(className);

Class[] paramType = call.getParamType();

// 得到方法

Method method = classType.getMethod(methodName, paramType);

// 从缓存中取出相关的远程对象

// Object obj = remoteObjecs.get(className);

Object obj = classType.newInstance();

if (obj == null) {

throw new Exception(className + "远程对象不存在");

} else {

// 调用远程对象的方法

result = method.invoke(obj, params);

}

} catch (Exception e) {

System.out.println("出现错误了..." + e);

}

call.setResult(result);

return call;

}

public static void main(String args[]) throws Exception {

SimplServer server = new SimplServer();

server.register("com.hou.service.impl.HelloServiceImpl",

new HelloServiceImpl());

server.service();

}

}

SocketClient:
package com.hou.client;

import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.net.Socket;

/**
* 客户端
*/
import com.hou.util.Call;

public class SimpleClient {

public void invoke() throws Exception {
Socket socket = new Socket("localhost", 8000);
OutputStream out = socket.getOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(out);
InputStream in = socket.getInputStream();
ObjectInputStream ois = new ObjectInputStream(in);
Call call = new Call("com.hou.service.impl.HelloServiceImpl", "echo",
new Class[] { String.class }, new Object[] { "猴哥" });
// 向服务器发送对象包
oos.writeObject(call);
// 接受服务器返回的对象包
call = (Call) ois.readObject();
System.out.println("返回结果：" + call.getResult());
ois.close();
oos.close();
socket.close();
}

public static void main(String args[]) throws Exception {
new SimpleClient().invoke();
}
}

Invoke Class:
public class HelloServiceImpl implements HelloService {

public String echo(String msg) {
return "Echo:"+msg;
}

public Date getTime() {
return new Date();
}

}

以上是利用java反射机制实现远程调用，RMI远程调用就是采用该机制。如果利用NIO远程调用时间效率更高。