序

之前写过一篇文章：springmvc不断输出文本到网页，采用的是对response不断进行write和flush实现的。在spring 4.2版本的时候提供了一个SseEmitter可以直接用来实现这个功能。

实例

@Controller
@RequestMapping("/sse")
public class SseEmitterController {
    private static final Logger LOGGER = LoggerFactory.getLogger(SseEmitterController.class);
    @Autowired
    @Qualifier("mvcTaskExecutor")
    ThreadPoolTaskExecutor mvcTaskExecutor;
    @GetMapping("")
    public SseEmitter sseDemo() throws InterruptedException {
        final SseEmitter emitter = new SseEmitter(0L); //timeout设置为0表示不超时
        mvcTaskExecutor.execute(() -> {
            try {
                for(int i=0;i<100;i++){
                    emitter.send("hello"+i);
                    LOGGER.info("emit:{}","hello"+i);
                    Thread.sleep(1000*1);
                emitter.complete();
            } catch (Exception e) {
                emitter.completeWithError(e);
        return emitter;
}

输出实例

data:"hello0"
data:"hello1"
data:"hello2"
data:"hello3"
data:"hello4"