[英]Serialization and Deserialization through message queue
我有一個Employee
類如下:
package com.mypackage.rabbitmq.model
import java.io.Serializable;
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement
public class Employee implements Serializable{
/**
*
*/
private static final long serialVersionUID = -2736911235490297622L;
private int EmpNo;
private String FirstName;
private String LastName;
private int age;
private String gender;
private String skill;
private long phone;
private String email;
private double salary;
//getters and setters
我在兔子MQ中發布了員工名單,如下所示:
package com.mypackage.rabbitmq.client.publisher;
//imports
public class Publisher {
public static void main(String[] args) throws IOException {
ConnectionFactory factory = new ConnectionFactory();
Connection con = factory.newConnection("localhost");
Channel channel = con.createChannel();
Gson gson = new GsonBuilder().create();
Employee employee = null;
List<Employee> empList = new ArrayList<>();
ByteArrayOutputStream bos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(bos);
String queueName = "TestQueue";
for(int i=1; i<=10; i++){
employee = newEmp(i);
String message =gson.toJson(employee);
System.out.println("queueName: "+queueName);
empList.add(employee);
}
oos.writeObject(empList);
channel.basicPublish(1, "", queueName, null, bos.toByteArray());
System.out.println("[X], sent '"+empList+"'");
channel.close(0, queueName);
con.close(0, queueName);
}
public static Employee newEmp(int i){
//logic here
}
}
從一個單獨的春季啟動應用程序,我試圖使用員工列表。 在消費者應用程序中,我具有相同的員工類結構。 然而,包裝是不同的。
package org.springboot.consumer.model;
import java.io.Serializable;
public class Employee implements Serializable{
//fields and getters-setters here
}
簡而言之,消費者代碼如下:
public class SDPRabbitMQConsumer implements MessageListener {
@Override
public void onMessage(Message message) {
Gson gson = new GsonBuilder().create();
try {
ByteArrayOutputStream os = new ByteArrayOutputStream();
os.write(message.getBody(), 0, message.getBody().length);
ByteArrayInputStream is = new ByteArrayInputStream(os.toByteArray());
ObjectInputStream objInputStream = new ObjectInputStream(is);
System.out.println("objInputStream.readObject().toString()"+objInputStream.readObject().toString());
Employee[] employeeArray = gson.fromJson(objInputStream.readObject().toString(), Employee[].class);
List<Employee> employeeList = new ArrayList<Employee>(Arrays.asList(employeeArray));
for(Employee employee: employeeList){
System.out.println(employee);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
但我得到以下例外:
java.lang.ClassNotFoundException: com.mypackage.rabbitmq.model.Employee
它似乎是序列化和反序列化問題。
我的問題是:
提前致謝。
1)雖然java.util.List不是Serializable,但所有標准實現都是,所以你應該能夠序列化/反序列化ArrayList。
2)是的,你需要在同一個包中使用相同的類,並且..
3)兩端的類必須具有相同的serialVersionUID
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