使用java实现一个websocket的消息推送代码,要求使用spring boot 项目实现,要求引入的jar包明确,包含数据库设计,实现类,接口等
时间: 2023-08-06 17:03:46 浏览: 54
好的,以下是一个使用Spring Boot实现WebSocket消息推送的示例代码,同时包含数据库设计、实现类和接口:
1. 添加依赖
在项目的pom.xml文件中添加以下依赖:
```xml
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
```
2. 创建实体类
创建一个名为“Message”的实体类,用于表示消息:
```java
@Entity
public class Message {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String content;
private LocalDateTime createTime;
// getter and setter
}
```
3. 创建Repository
创建一个名为“MessageRepository”的Repository接口,继承自JpaRepository,用于操作“Message”实体类:
```java
@Repository
public interface MessageRepository extends JpaRepository<Message, Long> {
}
```
4. 创建WebSocket配置类
创建一个名为“WebSocketConfig”的配置类,用于配置WebSocket相关的内容:
```java
@Configuration
@EnableWebSocket
public class WebSocketConfig implements WebSocketConfigurer {
@Autowired
private WebSocketHandler webSocketHandler;
@Override
public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
registry.addHandler(webSocketHandler, "/ws").setAllowedOrigins("*");
}
}
```
5. 创建WebSocket处理类
创建一个名为“WebSocketHandler”的处理类,用于处理WebSocket连接、消息发送等操作:
```java
@Component
public class WebSocketHandler extends TextWebSocketHandler {
private final SimpMessagingTemplate messagingTemplate;
private final MessageRepository messageRepository;
@Autowired
public WebSocketHandler(SimpMessagingTemplate messagingTemplate, MessageRepository messageRepository) {
this.messagingTemplate = messagingTemplate;
this.messageRepository = messageRepository;
}
@Override
public void afterConnectionEstablished(WebSocketSession session) throws Exception {
super.afterConnectionEstablished(session);
List<Message> messages = messageRepository.findAll();
for (Message message : messages) {
messagingTemplate.convertAndSend("/topic/messages", message.getContent());
}
}
@Override
protected void handleTextMessage(WebSocketSession session, TextMessage message) throws Exception {
super.handleTextMessage(session, message);
String content = message.getPayload();
Message newMessage = new Message();
newMessage.setContent(content);
newMessage.setCreateTime(LocalDateTime.now());
messageRepository.save(newMessage);
messagingTemplate.convertAndSend("/topic/messages", content);
}
}
```
6. 创建Controller
创建一个名为“MessageController”的Controller类,用于向客户端发送消息:
```java
@RestController
@RequestMapping("/messages")
public class MessageController {
private final SimpMessagingTemplate messagingTemplate;
@Autowired
public MessageController(SimpMessagingTemplate messagingTemplate) {
this.messagingTemplate = messagingTemplate;
}
@PostMapping
public void sendMessage(@RequestBody String content) {
messagingTemplate.convertAndSend("/topic/messages", content);
}
}
```
7. 创建WebSocket客户端
在前端页面中,使用WebSocket连接到服务器,并监听服务器发送的消息:
```javascript
var socket = new WebSocket("ws://localhost:8080/ws");
socket.onmessage = function(event) {
console.log(event.data);
};
```
以上就是一个使用Spring Boot实现WebSocket消息推送的示例代码,同时包含数据库设计、实现类和接口。