此内容没有您所选择的语言版本。

Chapter 3. Getting started

This chapter guides you through the steps to set up your environment and run a simple messaging program.

3.1. Prerequisites
复制链接

To build the example, Maven must be configured to use the Red Hat repository or a local repository.
You must have a message broker listening for connections on localhost. It must have anonymous access enabled. For more information, see Starting the broker.
You must have a queue named example. For more information, see Creating a queue.

The Hello World example creates a connection to the broker, sends a message containing a greeting to the example queue, and receives it back. On success, it prints the received message to the console.

Example: Sending and receiving "Hello World!" - HelloWorld.java

package net.example;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.jms.annotation.EnableJms;
import org.springframework.jms.annotation.JmsListener;
import org.springframework.jms.core.JmsTemplate;

@EnableJms
@SpringBootApplication
public class HelloWorld implements CommandLineRunner {
    @Autowired
    private JmsTemplate jmsTemplate;

    public static void main(String[] args) {
        SpringApplication.run(HelloWorld.class, args);
    }

    @Override
    public void run(String... strings) throws Exception {
        sendMessage("Hello World!");
    }

    public void sendMessage(String text) {
        System.out.println(String.format("Sending '%s'", text));
        this.jmsTemplate.convertAndSend("example", text);
    }

    @JmsListener(destination = "example")
    public void receiveMessage(String text) {
        System.out.println(String.format("Received '%s'", text));
    }
}

Running the example

To compile and run the example program, use the following procedure:

Procedure

Create a new project directory. This is referred to as <project-dir> in the steps that follow.

Copy the example listing to the following location:

<project-dir>/src/main/java/net/example/HelloWorld.java

Use a text editor to create a new <project-dir>/pom.xml file. Add the following XML to it:

<project>
  <modelVersion>4.0.0</modelVersion>

  <groupId>net.example</groupId>
  <artifactId>example</artifactId>
  <version>1.0.0-SNAPSHOT</version>

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.2.7.RELEASE</version>
  </parent>

  <dependencies>
    <dependency>
      <groupId>org.amqphub.spring</groupId>
      <artifactId>amqp-10-jms-spring-boot-starter</artifactId>
      <version>2.2.7.redhat-00002</version>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>
    </plugins>
  </build>
</project>

Change to the project directory and use the mvn command to compile the program.
```
$ mvn clean package
```

Use the java command to run the program.

$ java -jar target/example-1.0.0-SNAPSHOT.jar

Running the Hello World example results in the following console output:

$ java -jar target/example-1.0.0-SNAPSHOT.jar

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.0.5.RELEASE)

[...]
2018-11-05 16:21:09.849  INFO 14805 --- [main] net.example.HelloWorld: Started HelloWorld in 1.074 seconds (JVM running for 1.38)
Sending 'Hello World!'
Received 'Hello World!'

3.3. Additional examples
复制链接

More example programs are available from the AMQP 1.0 JMS Spring Boot project and the Spring project.

了解 AI

浏览更多

开始

实践操作

学习路径

Training & certifications

热门文档

参考

技术主题

产品概述

程序库

开发人员沙盒

此内容没有您所选择的语言版本。

Chapter 3. Getting started

3.1. Prerequisites
复制链接

3.2. Running Hello World
复制链接

Running the example

3.3. Additional examples
复制链接

学习

尝试、购买和销售

社区

關於紅帽

让开源更具包容性

关于红帽文档

Theme

Red Hat legal and privacy links

Red Hat legal and privacy links

此内容没有您所选择的语言版本。

Chapter 3. Getting started

3.1. Prerequisites复制链接链接已复制到粘贴板!

3.2. Running Hello World复制链接链接已复制到粘贴板!

Running the example

3.3. Additional examples复制链接链接已复制到粘贴板!

学习

尝试、购买和销售

社区

關於紅帽

让开源更具包容性

关于红帽文档

Theme

Red Hat legal and privacy links

Red Hat legal and privacy links

3.1. Prerequisites
复制链接

3.2. Running Hello World
复制链接

3.3. Additional examples
复制链接