不写前端代码，curl直接调试sse

不写前端代码，curl直接开两个终端调试sse

过程：

客户端向服务端发送建立连接请求；
服务端向客户端推送内容；
服务端向客户端发送结束信号并结束

注意事项：

只有连接时要求content-type是xxx

其他问题：

服务端打算断开时，是否需要先得到客户端应答再断开？

java代码参考：

controller层

@RestController
public class ChatController {@Autowiredprivate ChatService chatService;// TODO: 2023/10/16 执行顺序@CrossOrigin@PostMapping(value = "/ask")@SneakyThrowspublic void chatGPT(@RequestBody ChatRequest request) {chatService.chat(request);// TODO: 2023/10/16 执行顺序 2}@CrossOrigin@GetMapping(value = "/link", produces = "text/event-stream;charset=utf-8")@SneakyThrowspublic SseEmitter link() {return chatService.link();// TODO: 2023/10/16 执行顺序 1}@CrossOrigin@PostMapping(value = "/stop")@SneakyThrowspublic void chatGPT() {chatService.stop();// TODO: 2023/10/16 执行顺序 3}
}

请求体

@Data
@AllArgsConstructor
@NoArgsConstructor
public class ChatRequest {private String question;
}

接口

public interface ChatService {void chat(ChatRequest request);SseEmitter link();void stop();}

实现类

@Slf4j
@Service
public class ChatServiceImpl implements ChatService {static HashMap<String, SseEmitter> map = new HashMap<>();@SneakyThrows@Overridepublic void chat(ChatRequest request) {SseEmitter sseEmitter = map.get("222");String question = request.getQuestion();char[] chars = question.toCharArray();for (int i = 0; i < chars.length; i++) {sseEmitter.send(SseEmitter.event().id("111").data(chars[i]));}}@SneakyThrows@Overridepublic SseEmitter link() {SseEmitter sseEmitter = new SseEmitter(0L);//设置超时时间，单位为毫秒map.put("222", sseEmitter);//  >> 回调1：长链接完成后回调接口(即关闭连接时调用)sseEmitter.onCompletion(() -> {map.remove("222");log.info("连接关闭, userId = {},  sessionId = {}, 时间戳 = {}", null, null, System.currentTimeMillis());// TODO: 2023/10/16 执行顺序 4});//  >> 回调2：出现异常会调用此方法sseEmitter.onError(new Consumer<Throwable>() {@Overridepublic void accept(Throwable throwable) {log.info("连接出错, userId = {},  sessionId = {}, 时间戳 = {}", null, null, System.currentTimeMillis());sseEmitter.completeWithError(new RuntimeException("SSE 超时了"));}});//  >> 回调3：出现连接超时，会调用此方法sseEmitter.onTimeout(() -> {log.info("连接超时, userId = {},  sessionId = {}, 时间戳 = {}", null, null , System.currentTimeMillis());sseEmitter.completeWithError(new RuntimeException("SSE 超时了"));});sseEmitter.send(SseEmitter.event().data("操作成功"));return sseEmitter;}@SneakyThrows@Overridepublic void stop() {SseEmitter sseEmitter = map.get("222");sseEmitter.send(SseEmitter.event().id("111").data("中断"));sseEmitter.complete();}
}

终端开两个窗口通过curl验证效果

• 请求连接的curl

curl -H "Accept: text/event-stream" http://localhost:9033/link

得到应答：

• 提问的curl（这个演示的是将输入的文字推送出来）：

curl -X POST -H "Content-Type: application/json" -d "{\"question\": \"hhhhh\"}" http://localhost:9033/ask

提问后得到的响应：

• mock服务主动断开的curl：

curl -X POST http://localhost:9033/stop

客户端收到的：