この質問は 、rabbitmq を使用して文字列ではなく構造体のメッセージを送信する際の質問と重複していることを理解しています
最初の方法を使用してこれを行う場合
次のトレースがあります。
java.io.EOFException
at java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream.java:2304)
at java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputStream.java:2773)
at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:798)
at java.io.ObjectInputStream.<init>(ObjectInputStream.java:298)
at com.mdnaRabbit.worker.data.Data.fromBytes(Data.java:78)
at com.mdnaRabbit.worker.App.main(App.java:41)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
メッセージが送信者クラスで完全にバイトに変換されることを確認しましたが、消費者はそれを受信できません。
ここに私のプロデューサークラスがあります:
package com.mdnaRabbit.newt;
import java.io.IOException;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.MessageProperties;
import org.apache.commons.lang.SerializationUtils;
import com.mdnaRabbit.worker.data.Data;
public class App {
private static final String TASK_QUEUE_NAME = "task_queue";
public static void main( String[] argv) throws IOException{
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("localhost");
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
channel.queueDeclare(TASK_QUEUE_NAME, true, false, false, null);
int i = 0;
do {
Data message = getMessage();
byte [] byteMessage = message.getBytes();
//System.out.println(byteMessage);
channel.basicPublish("", TASK_QUEUE_NAME, MessageProperties.PERSISTENT_TEXT_PLAIN, byteMessage);
System.out.println(" [" + (i+1) + "] message Sent" + Data.fromBytes(byteMessage).getBody());
i++;
} while (i<15);
channel.close();
connection.close();
}
private static Data getMessage(){
Data data = new Data();
data.setHeader("header");
data.setDomainId("abc.com");
data.setReceiver("me");
data.setSender("he");
data.setBody("body");
return data;
}
private static String joinStrings(String[] strings, String delimiter){
int length = strings.length;
if (length == 0) return "";
StringBuilder words = new StringBuilder(strings[0]);
for (int i = 1; i < length; i++){
words.append(delimiter).append(strings[i]);
}
return words.toString();
}
}
ここに私の消費者クラスがあります:
package com.mdnaRabbit.worker;
import java.io.IOException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.QueueingConsumer;
import com.mdnaRabbit.worker.data.Data;
import org.apache.commons.lang.SerializationUtils;
public class App {
private static final String TASK_QUEUE_NAME = "task_queue";
private static int i = 0;
public static void main( String[] argv )
throws IOException,
InterruptedException{
ExecutorService threader = Executors.newFixedThreadPool(20);
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("localhost");
Connection connection = factory.newConnection(threader);
final Channel channel = connection.createChannel();
channel.queueDeclare(TASK_QUEUE_NAME, true, false, false, null);
System.out.println(" [*] Waiting for messages. To exit press CTRL+C");
channel.basicQos(20);
final QueueingConsumer consumer = new QueueingConsumer(channel);
channel.basicConsume(TASK_QUEUE_NAME, false, consumer);
try {
while (true) {
try {QueueingConsumer.Delivery delivery = consumer.nextDelivery();
Data message = Data.fromBytes(delivery.getBody());
//Data message = (Data) SerializationUtils.deserialize(delivery.getBody());
System.out.println(" [" + (i++) +"] Received" + message.getBody());
channel.basicAck(delivery.getEnvelope().getDeliveryTag(), false);
}catch (Exception e){
}
}
} catch (Exception e){
e.printStackTrace();
}
channel.close();
connection.close();
}
}
ここに私のデータクラスがあります:
package com.mdnaRabbit.worker.data;
import java.io.*;
import java.util.logging.Level;
import java.util.logging.Logger;
public class Data implements Serializable{
public String header;
public String body;
public String domainId;
public String sender;
public String receiver;
public void setHeader(String head){
this.header = head;
}
public String getHeader(){
return header;
}
public void setBody(String body){
this.body = body;
}
public String getBody(){
return body;
}
public void setDomainId(String domainId){
this.domainId = domainId;
}
public String getDomainId(){
return domainId;
}
public void setSender(String sender){
this.sender = sender;
}
public String getSender(){
return sender;
}
public String getReceiver(){
return receiver;
}
public void setReceiver(String receiver){
this.receiver = receiver;
}
public byte[] getBytes() {
byte[]bytes;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try{
ObjectOutputStream oos = new ObjectOutputStream(baos);
oos.writeObject(this);
oos.flush();
oos.reset();
bytes = baos.toByteArray();
oos.close();
baos.close();
} catch(IOException e){
bytes = new byte[] {};
Logger.getLogger("bsdlog").log(Level.ALL, "unable to write to output stream" + e);
}
return bytes;
}
public static Data fromBytes(byte[] body) {
Data obj = null;
try {
ByteArrayInputStream bis = new ByteArrayInputStream(body);
ObjectInputStream ois = new ObjectInputStream(bis);
obj = (Data) ois.readObject();
ois.close();
bis.close();
}
catch (IOException e) {
e.printStackTrace();
}
catch (ClassNotFoundException ex) {
ex.printStackTrace();
}
return obj;
}
}
コンシューマーがメッセージを受信しているように常に見えるのは、それをオブジェクトに変換しようとせずに書き込むだけ
System.out.println(delivery.getBody)
で、バイトが表示されるためです。