Apache Thrift之java入门例子

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Apache Thrift 是 Facebook 实现的一种高效的、支持多种编程语言的远程服务调用的框架

一：

首先加入thrift的java的依赖

<dependency><groupId>org.apache.thrift</groupId><artifactId>libthrift</artifactId><version>0.9.3</version></dependency>

二：

本文首先介绍一个简单的 Thrift 实现实例，使读者能够快速直观地了解什么是 Thrift 以及如何使用 Thrift 构建服务。
创建一个简单的服务Calculator。首先根据 Thrift 的语法规范编写脚本文件 Calculator.thrift，代码如下：

namespace java com.pp.calcservice Calculator{i32 add(1:i32 num1, 2:i32 num2)i64 multi(1:i32 num1, 2:i32 num2)}

然后执行thrift命令，生成java代码

thrift -r -gen java Calculator.thrift

这样，就会在当前目录下创建了一个gen-java目录，目录里面是java代码，把目录里面的东西放到项目的src目录中

编写Calculator.Iface（thrift自动生成的，这里就不贴出来了）接口的实现类

package com.pp.calc.impl;import org.apache.thrift.TException;import com.pp.calc.Calculator;public class CalculatorImpl implements Calculator.Iface{public int add(int num1, int num2) throws TException{return num1 + num2;}public long multi(int num1, int num2) throws TException{return Long.valueOf(num1 * num2);}}

三：编写服务端

package com.pp.server;import org.apache.thrift.TMultiplexedProcessor;import org.apache.thrift.protocol.TCompactProtocol;import org.apache.thrift.protocol.TProtocolFactory;import org.apache.thrift.server.TServer;import org.apache.thrift.server.TThreadPoolServer;import org.apache.thrift.transport.TServerSocket;import com.pp.calc.Calculator;import com.pp.calc.impl.CalculatorImpl;public class Server{public static final int PORT = 9988;public static void main(String[] args)throws Exception{TServerSocket serverSocket = new TServerSocket(PORT); TProtocolFactory protocolFactory = new TCompactProtocol.Factory();  TMultiplexedProcessor mp = new TMultiplexedProcessor();mp.registerProcessor("Calculator", new Calculator.Processor<>(new CalculatorImpl()));final TServer server = new TThreadPoolServer(new TThreadPoolServer.Args(serverSocket).protocolFactory(protocolFactory).processor(mp));  new Thread(() -> {//这个方法会阻塞线程server.serve();}).start();System.out.println("Start server on port " + PORT + " ...");  }}

四：编写客户端

package com.pp.client;import org.apache.thrift.protocol.TCompactProtocol;import org.apache.thrift.protocol.TMultiplexedProtocol;import org.apache.thrift.protocol.TProtocol;import org.apache.thrift.transport.TSocket;import org.apache.thrift.transport.TTransport;import com.pp.calc.Calculator;public class Client {    public static void main( String[] args)throws Exception    {    TTransport transport = new TSocket("127.0.0.1", 9988);          transport.open();                  TProtocol protocol = new TCompactProtocol(transport);                  TMultiplexedProtocol mp = new TMultiplexedProtocol(protocol, "Calculator");                Calculator.Client calc = new Calculator.Client(mp);                System.out.println(calc.add(1, 222));        System.out.println(calc.multi(22, 33));                transport.close();    }}

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