thrift servlet

Thrift通常以独立服务存在，也支持HTTP协议，以servlet方式在Tomcat中运行。

一. 服务端Servlet

实现比较简单，只需实现TExtensibleServlet，并在getProcessor()中填充实现类。

/**
 * Thrift servlet
 */
@WebServlet(name="thrifttest",value="/thrifttest")
public class ThriftService extends TExtensibleServlet {
  private static final long serialVersionUID = 1L;

  @Override
  protected TProtocolFactory getInProtocolFactory() {
    TProtocolFactory factory = new TCompactProtocol.Factory();
    return factory;
  }

  @Override
  protected TProtocolFactory getOutProtocolFactory() {
    TProtocolFactory factory = new TCompactProtocol.Factory();
    return factory;
  }

  @Override
  protected TProcessor getProcessor() {
    // 接口实现类
    ThriftServiceImpl impl = new ThriftServiceImpl();

    // 返回处理器
    TProcessor tProcesser = new SimpleThriftService.Processor<SimpleThriftService.Iface>(impl); 
    return tProcesser;
  }
}

二. 客户端

/**
 * Http thrift client
 */
public static void httpClient() {  
  String url = "http://host:8080/servlet3/thrifttest";  
  try {
    TTransport transport = new THttpClient(url);           
    TProtocol protocol = new TCompactProtocol(transport); // HTTP通信协议     
    SimpleThriftService.Client client = new SimpleThriftService.Client(protocol);

    transport.open();  
    int val = client.getInt(10);  // 调用方法
    System.out.println( "Val: " + val );

    transport.close();  
  } catch (TException e) {
    e.printStackTrace();
  }  
}

三. 协议分析