WebClientd的Block和Subscribe

最新推荐文章于 2025-12-29 09:00:04 发布

原创最新推荐文章于 2025-12-29 09:00:04 发布 · 2.6k 阅读

1 ·

CC 4.0 BY-SA版权

文章标签：

#spring 5 #java

WebClient 专栏收录该内容

2 篇文章

订阅专栏

本文通过Java代码示例展示了WebClient在调用服务时，使用block和subscribe方法的区别。block是同步调用，会阻塞直到服务完成；而subscribe是异步调用，不会等待服务完成。实验结果显示，服务是否有返回值并不影响这一行为，block始终同步，subscribe始终异步。

探究WebClient的block和subscribe call有无return的服务的区别

Java代码

Server

Server1

@RequestMapping("/server1")
    public void server1(){
        for (int i = 0; i < 5; i++) {
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            log.info("server1 is executing");
        }
        log.info("server1 is done");
    }

Server2

 @RequestMapping("/server2")
    public String server2(){
        for (int i = 0; i < 5; i++) {
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            log.info("server2 is executing");
        }
        log.info("server2 is done");
        return "server2's return";
    }

Client

client1

@RequestMapping("/client1")
    public void client1() {
        log.info("block call 无return");
        Void block = webClient.get().uri("/server1").retrieve().bodyToMono(Void.class).block();
        log.info("client1 finished");
    }

client2

 @RequestMapping("/client2")
    public void client2() {
        log.info("block call 有return");
        String block = webClient.get().uri("/server2").retrieve().bodyToMono(String.class).block();
        log.info("client2 finished");
    }

client3

@RequestMapping("/client3")
    public void client3() {
        log.info("subscribe call 无return");
        Disposable subscribe = webClient.get().uri("/server1").retrieve().bodyToMono(Void.class).subscribe();
        log.info("client3 finished");
    }

client4

@RequestMapping("/client4")
    public void client4() {
        log.info("subscribe call 有return");
        Disposable subscribe = webClient.get().uri("/server2").retrieve().bodyToMono(String.class).subscribe();
        log.info("client4 finished");
    }