thrift 学习

创建Thrift文件
Thrift文件与编程语言无关，用于定义数据类型和服务接口，然后生成用来构建RPC客户和服务器所需的全部代码。
1.1 编写testJava.thrift

#!/usr/local/bin/thrift --gen java

namespace java Test

service Something {
    i32 ping()
}

1.2 运行thrift编译器，生成项目源文件
在linux命令行下输入：Thrift –gen java testJava.thrift
生成的源文件在./gen-java/目录下。
创建Java服务器
进入./gen-java目录，确保系统的CLASSPATH设置正确。libthrift.jar,，slf4j-api和slf4j-simple这几个包都需要包含在CLASSPATH里。
1.3 编写SomethingImpl.java

package Test;

import org.apache.thrift.TException;

class SomethingImpl implements Something.Iface {
 public SomethingImpl() {}
 public int ping() throws TException {
     System.out.println( "Recieve ping from client..." );
     return 0;
}
}

1.4 创建Server.java

package Test;

import java.io.IOException;
import org.apache.thrift.protocol.TBinaryProtocol;
import org.apache.thrift.protocol.TBinaryProtocol.Factory;
import org.apache.thrift.server.TServer;
import org.apache.thrift.server.TThreadPoolServer;
import org.apache.thrift.transport.TServerSocket;
import org.apache.thrift.transport.TTransportException;

public class Server {
private void start() {
try {
TServerSocket serverTransport = new TServerSocket(7911);
    Something.Processor processor = new Something.Processor(new SomethingImpl());
    Factory protFactory = new TBinaryProtocol.Factory(true, true);
    TServer server = new TThreadPoolServer(processor, serverTransport, protFactory);
    System.out.println("Starting server on port 7911 ...");
    server.serve();
    
   } catch (TTransportException e) { 
    e.printStackTrace();
   } catch (Exception e) {
    e.printStackTrace();
}
}

public static void main(String args[]) {
    Server srv = new Server();
    srv.start();
}   
}

创建Java客户端
创建Client.java

package Test;

import java.io.IOException;
import org.apache.thrift.*;
import org.apache.thrift.protocol.*;
import org.apache.thrift.transport.*;

public class Client {
      public static void main(String [] args) {
           try {
                    TTransport transport = new TSocket("localhost", 7911);
                    TProtocol protocol = new TBinaryProtocol(transport);
                    Something.Client client = new Something.Client(protocol);
                    transport.open();
                    System.out.println("Client calls ping()");
                    client.ping();
                    transport.close();
               } catch (TException x) {
                    x.printStackTrace();
               }   
        }   
} 

编译及运行
1.5 编译
在linux命令行下输入：javac *.java，生成客户端与服务器端的class文件。
1.6 运行
首先启动服务器。退到gen-java目录，输入java Test/Server，屏幕显示如下：
Starting server on port 7911 ...
然后启动客户端。在同一目录下输入java Test/Client，屏幕显示如下：
Client calls ping()
这时服务器端的输出多了一行：
Recieve ping from client...