230110_50_RPC底层原理

• 最终版本，利用hessian实现rpc调用
• HessianUtil

package com.bill.rpc10;

import com.caucho.hessian.io.Hessian2Input;
import com.caucho.hessian.io.Hessian2Output;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

/**
 * @Auther: wangchunwen
 * @Date: 2023/1/10 - 01 - 10 - 23:31
 * @Description: com.bill.rpc10
 * @version: 1.0
 */
public class HessianUtil {
    public static byte[] serialize(Object o) throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        Hessian2Output output = new Hessian2Output(baos);
        output.writeObject(o);
        byte[] bytes = baos.toByteArray();
        baos.close();
        output.close();
        return bytes;
    }

    public static Object deseriabliz(byte[] bytes) throws IOException {
        ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
        Hessian2Input input = new Hessian2Input(bais);
        Object o = input.readObject();
        bais.close();
        input.close();
        return o;
    }
}

• ProductServiceImpl

package com.bill.rpc10;

import com.bill.rpc.common.Product;

/**
 * @Auther: wangchunwen
 * @Date: 2023/1/10 - 01 - 10 - 23:42
 * @Description: com.bill.rpc10
 * @version: 1.0
 */
public class ProductServiceImpl {
    public Product findProduct(Integer id) {
        return new Product(id,"321");
    }
}

• client

package com.bill.rpc10;

import com.bill.rpc.common.IProductService;
import com.bill.rpc07.Stub;

/**
 * @Auther: wangchunwen
 * @Date: 2023/1/10 - 01 - 10 - 23:41
 * @Description: com.bill.rpc10
 * @version: 1.0
 */
public class Client {
    public static void main(String[] args) {
        IProductService productService = (IProductService) Stub.getStub(IProductService.class);
        System.out.println(productService.findProduct(12));
    }
}

• server

package com.bill.rpc10;

import com.bill.rpc07.ProductServiceImpl;

import java.io.*;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.ServerSocket;
import java.net.Socket;

/**
 * @Auther: wangchunwen
 * @Date: 2023/1/10 - 01 - 10 - 23:42
 * @Description: com.bill.rpc10
 * @version: 1.0
 */
public class Server {
    private static boolean running = true;

    public static void main(String[] args) throws IOException, ClassNotFoundException, NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException {
        ServerSocket ss = new ServerSocket(8888);
        while (running){
            Socket s = ss.accept();
            process(s);
            s.close();
        }
        ss.close();
    }

    private static void process (Socket s) throws IOException, ClassNotFoundException, NoSuchMethodException, InvocationTargetException, IllegalAccessException, InstantiationException {
        InputStream in = s.getInputStream();
        OutputStream out = s.getOutputStream();
        ObjectInputStream ois = new ObjectInputStream(in);

        String className = ois.readUTF();
        String methodName = ois.readUTF();
        Class[] parameterTypes = (Class[]) ois.readObject();
        Object[] args = (Object[]) ois.readObject();

        Class clazz = null;
        // 从服务注册表找到具体的类
        clazz = ProductServiceImpl.class;

        Method method = clazz.getMethod(methodName,parameterTypes);
        Object o = (Object) method.invoke(clazz.newInstance(),args);

        ObjectOutputStream oos = new ObjectOutputStream(out);
        oos.writeObject(o);
        oos.flush();
    }
}