rabbitmq

Posted 2020-11-22 inthecloud

引入

implementation ‘com.rabbitmq:amqp-client:5.7.0‘

指定jdk版本，在build.grald   app目录下

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

网络

  <uses-permission android:name="android.permission.INTERNET"/>

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.widget.TextView;

import com.rabbitmq.client.AMQP;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DefaultConsumer;
import com.rabbitmq.client.Envelope;

import java.io.IOException;
import java.util.concurrent.TimeoutException;

public class MainActivity extends AppCompatActivity {

    ConnectionFactory factory;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //连接设置
        setupConnectionFactory();
        //用于从线程中获取数据，更新ui
        final Handler incomingMessageHandler = new Handler() {
            @Override
            public void handleMessage(Message msg) {
                String message = msg.getData().getString("msg");
                TextView tv = (TextView) findViewById(R.id.txtrabbitmqt);
                tv.append(message + ‘
‘);
                Log.i("test", "msg:" + message);
            }
        };
        //开启消费者线程
        //subscribe(incomingMessageHandler);
        new Thread(new Runnable() {
            @Override
            public void run() {
                basicConsume(incomingMessageHandler);
            }
        }).start();
    }

    /**
     * 连接设置
     */
    private void setupConnectionFactory() {
        factory =  new ConnectionFactory();
        factory.setHost("");
        factory.setPort(5672);
        factory.setUsername("longdb");
        factory.setPassword("***");
    }

    /**
     * 收消息（从发布者那边订阅消息）
     */
    private void basicConsume(final Handler handler){

        try {
            //连接
            Connection connection = factory.newConnection() ;
            //通道
            final Channel channel = connection.createChannel() ;
            //实现Consumer的最简单方法是将便捷类DefaultConsumer子类化。可以在basicConsume 调用上传递此子类的对象以设置订阅：
            channel.basicConsume("myqueue" , false ,  new DefaultConsumer(channel){
                @Override
                public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
                    super.handleDelivery(consumerTag, envelope, properties, body);

                    String msg = new String(body) ;
                    long deliveryTag = envelope.getDeliveryTag() ;
                    channel.basicAck(deliveryTag , false);
                    //从message池中获取msg对象更高效
                    Message uimsg = handler.obtainMessage();
                    Bundle bundle = new Bundle();
                    bundle.putString("msg", msg);
                    uimsg.setData(bundle);
                    handler.sendMessage(uimsg);

                }
            });
        } catch (IOException | TimeoutException e) {
            e.printStackTrace();
        }
    }
}