可以使用 JMeter 辅助测试 https://blog.csdn.net/weixin_45014379/article/details/124190381

@RestController

@RequestMapping({"/Test"})

public class test { 

    Logger logger = LoggerFactory.getLogger(this.getClass());

    // 使用 Semaphore 并发限制3个 超过阻塞

    private final Semaphore permit = new Semaphore(3, true);

    @GetMapping(value = {"/download"})

    public String download(HttpServletRequest request) {

        String result = "";

        try {

            // 获取令牌

            logger.info("锁住 {}", Thread.currentThread().getName());

            permit.acquire();

            logger.info("下载 {}", Thread.currentThread().getName());

            Thread.sleep(5000);

            result = "Success";

        } catch (Exception e) {

            e.printStackTrace();

            return e.getMessage();

        } finally {

            // 释放令牌

            permit.release();

            logger.info("释放 {}", Thread.currentThread().getName());

        }

    }

}


[2022-11-29 14:33:05.042] [http-nio-6201-exec-1] [INFO ] com.vipsoft.controller.ReleaseController - 锁住 http-nio-6201-exec-1

[2022-11-29 14:33:05.042] [http-nio-6201-exec-1] [INFO ] com.vipsoft.controller.ReleaseController - 工作 http-nio-6201-exec-1

[2022-11-29 14:33:05.097] [http-nio-6201-exec-4] [INFO ] com.vipsoft.controller.ReleaseController - 锁住 http-nio-6201-exec-4

[2022-11-29 14:33:05.097] [http-nio-6201-exec-4] [INFO ] com.vipsoft.controller.ReleaseController - 工作 http-nio-6201-exec-4

[2022-11-29 14:33:05.156] [http-nio-6201-exec-3] [INFO ] com.vipsoft.controller.ReleaseController - 锁住 http-nio-6201-exec-3

[2022-11-29 14:33:05.156] [http-nio-6201-exec-3] [INFO ] com.vipsoft.controller.ReleaseController - 工作 http-nio-6201-exec-3

[2022-11-29 14:33:05.204] [http-nio-6201-exec-5] [INFO ] com.vipsoft.controller.ReleaseController - 锁住 http-nio-6201-exec-5

[2022-11-29 14:33:05.205] [http-nio-6201-exec-5] [INFO ] com.vipsoft.controller.ReleaseController - 工作 http-nio-6201-exec-5

[2022-11-29 14:33:05.241] [http-nio-6201-exec-2] [INFO ] com.vipsoft.controller.ReleaseController - 锁住 http-nio-6201-exec-2

[2022-11-29 14:33:05.241] [http-nio-6201-exec-2] [INFO ] com.vipsoft.controller.ReleaseController - 工作 http-nio-6201-exec-2

[2022-11-29 14:33:05.291] [http-nio-6201-exec-6] [INFO ] com.vipsoft.controller.ReleaseController - 锁住 http-nio-6201-exec-6

[2022-11-29 14:33:05.292] [http-nio-6201-exec-6] [INFO ] com.vipsoft.controller.ReleaseController - 工作 http-nio-6201-exec-6

[2022-11-29 14:33:05.341] [http-nio-6201-exec-7] [INFO ] com.vipsoft.controller.ReleaseController - 锁住 http-nio-6201-exec-7

[2022-11-29 14:33:05.341] [http-nio-6201-exec-7] [INFO ] com.vipsoft.controller.ReleaseController - 工作 http-nio-6201-exec-7

[2022-11-29 14:33:05.396] [http-nio-6201-exec-8] [INFO ] com.vipsoft.controller.ReleaseController - 锁住 http-nio-6201-exec-8

[2022-11-29 14:33:05.396] [http-nio-6201-exec-8] [INFO ] com.vipsoft.controller.ReleaseController - 工作 http-nio-6201-exec-8

[2022-11-29 14:33:05.442] [http-nio-6201-exec-9] [INFO ] com.vipsoft.controller.ReleaseController - 锁住 http-nio-6201-exec-9

[2022-11-29 14:33:05.442] [http-nio-6201-exec-9] [INFO ] com.vipsoft.controller.ReleaseController - 工作 http-nio-6201-exec-9

[2022-11-29 14:33:05.492] [http-nio-6201-exec-10] [INFO ] com.vipsoft.controller.ReleaseController - 锁住 http-nio-6201-exec-10

[2022-11-29 14:33:05.492] [http-nio-6201-exec-10] [INFO ] com.vipsoft.controller.ReleaseController - 工作 http-nio-6201-exec-10

[2022-11-29 14:33:05.542] [http-nio-6201-exec-11] [INFO ] com.vipsoft.controller.ReleaseController - 锁住 http-nio-6201-exec-11

[2022-11-29 14:33:05.592] [http-nio-6201-exec-13] [INFO ] com.vipsoft.controller.ReleaseController - 锁住 http-nio-6201-exec-13

[2022-11-29 14:33:05.642] [http-nio-6201-exec-12] [INFO ] com.vipsoft.controller.ReleaseController - 锁住 http-nio-6201-exec-12

[2022-11-29 14:33:05.691] [http-nio-6201-exec-14] [INFO ] com.vipsoft.controller.ReleaseController - 锁住 http-nio-6201-exec-14

[2022-11-29 14:33:05.742] [http-nio-6201-exec-16] [INFO ] com.vipsoft.controller.ReleaseController - 锁住 http-nio-6201-exec-16

[2022-11-29 14:33:05.792] [http-nio-6201-exec-15] [INFO ] com.vipsoft.controller.ReleaseController - 锁住 http-nio-6201-exec-15

[2022-11-29 14:33:05.842] [http-nio-6201-exec-17] [INFO ] com.vipsoft.controller.ReleaseController - 锁住 http-nio-6201-exec-17

[2022-11-29 14:33:05.892] [http-nio-6201-exec-18] [INFO ] com.vipsoft.controller.ReleaseController - 锁住 http-nio-6201-exec-18

[2022-11-29 14:33:05.942] [http-nio-6201-exec-19] [INFO ] com.vipsoft.controller.ReleaseController - 锁住 http-nio-6201-exec-19

[2022-11-29 14:33:05.992] [http-nio-6201-exec-20] [INFO ] com.vipsoft.controller.ReleaseController - 锁住 http-nio-6201-exec-20

[2022-11-29 14:33:08.045] [http-nio-6201-exec-1] [INFO ] com.vipsoft.controller.ReleaseController - 释放 http-nio-6201-exec-1

[2022-11-29 14:33:08.045] [http-nio-6201-exec-11] [INFO ] com.vipsoft.controller.ReleaseController - 工作 http-nio-6201-exec-11

[2022-11-29 14:33:08.105] [http-nio-6201-exec-4] [INFO ] com.vipsoft.controller.ReleaseController - 释放 http-nio-6201-exec-4

[2022-11-29 14:33:08.105] [http-nio-6201-exec-13] [INFO ] com.vipsoft.controller.ReleaseController - 工作 http-nio-6201-exec-13

[2022-11-29 14:33:08.165] [http-nio-6201-exec-3] [INFO ] com.vipsoft.controller.ReleaseController - 释放 http-nio-6201-exec-3

[2022-11-29 14:33:08.165] [http-nio-6201-exec-12] [INFO ] com.vipsoft.controller.ReleaseController - 工作 http-nio-6201-exec-12

[2022-11-29 14:33:08.210] [http-nio-6201-exec-5] [INFO ] com.vipsoft.controller.ReleaseController - 释放 http-nio-6201-exec-5

[2022-11-29 14:33:08.210] [http-nio-6201-exec-14] [INFO ] com.vipsoft.controller.ReleaseController - 工作 http-nio-6201-exec-14

[2022-11-29 14:33:08.256] [http-nio-6201-exec-2] [INFO ] com.vipsoft.controller.ReleaseController - 释放 http-nio-6201-exec-2

[2022-11-29 14:33:08.256] [http-nio-6201-exec-16] [INFO ] com.vipsoft.controller.ReleaseController - 工作 http-nio-6201-exec-16

[2022-11-29 14:33:08.302] [http-nio-6201-exec-6] [INFO ] com.vipsoft.controller.ReleaseController - 释放 http-nio-6201-exec-6

[2022-11-29 14:33:08.302] [http-nio-6201-exec-15] [INFO ] com.vipsoft.controller.ReleaseController - 工作 http-nio-6201-exec-15

[2022-11-29 14:33:08.347] [http-nio-6201-exec-7] [INFO ] com.vipsoft.controller.ReleaseController - 释放 http-nio-6201-exec-7

[2022-11-29 14:33:08.347] [http-nio-6201-exec-17] [INFO ] com.vipsoft.controller.ReleaseController - 工作 http-nio-6201-exec-17

[2022-11-29 14:33:08.408] [http-nio-6201-exec-8] [INFO ] com.vipsoft.controller.ReleaseController - 释放 http-nio-6201-exec-8

[2022-11-29 14:33:08.408] [http-nio-6201-exec-18] [INFO ] com.vipsoft.controller.ReleaseController - 工作 http-nio-6201-exec-18

[2022-11-29 14:33:08.454] [http-nio-6201-exec-19] [INFO ] com.vipsoft.controller.ReleaseController - 工作 http-nio-6201-exec-19

[2022-11-29 14:33:08.454] [http-nio-6201-exec-9] [INFO ] com.vipsoft.controller.ReleaseController - 释放 http-nio-6201-exec-9

[2022-11-29 14:33:08.498] [http-nio-6201-exec-10] [INFO ] com.vipsoft.controller.ReleaseController - 释放 http-nio-6201-exec-10

[2022-11-29 14:33:08.498] [http-nio-6201-exec-20] [INFO ] com.vipsoft.controller.ReleaseController - 工作 http-nio-6201-exec-20

[2022-11-29 14:33:11.047] [http-nio-6201-exec-11] [INFO ] com.vipsoft.controller.ReleaseController - 释放 http-nio-6201-exec-11

[2022-11-29 14:33:11.109] [http-nio-6201-exec-13] [INFO ] com.vipsoft.controller.ReleaseController - 释放 http-nio-6201-exec-13

[2022-11-29 14:33:11.167] [http-nio-6201-exec-12] [INFO ] com.vipsoft.controller.ReleaseController - 释放 http-nio-6201-exec-12

[2022-11-29 14:33:11.213] [http-nio-6201-exec-14] [INFO ] com.vipsoft.controller.ReleaseController - 释放 http-nio-6201-exec-14

[2022-11-29 14:33:11.258] [http-nio-6201-exec-16] [INFO ] com.vipsoft.controller.ReleaseController - 释放 http-nio-6201-exec-16

[2022-11-29 14:33:11.304] [http-nio-6201-exec-15] [INFO ] com.vipsoft.controller.ReleaseController - 释放 http-nio-6201-exec-15

[2022-11-29 14:33:11.350] [http-nio-6201-exec-17] [INFO ] com.vipsoft.controller.ReleaseController - 释放 http-nio-6201-exec-17

[2022-11-29 14:33:11.411] [http-nio-6201-exec-18] [INFO ] com.vipsoft.controller.ReleaseController - 释放 http-nio-6201-exec-18

[2022-11-29 14:33:11.458] [http-nio-6201-exec-19] [INFO ] com.vipsoft.controller.ReleaseController - 释放 http-nio-6201-exec-19

[2022-11-29 14:33:11.503] [http-nio-6201-exec-20] [INFO ] com.vipsoft.controller.ReleaseController - 释放 http-nio-6201-exec-20

Disconnected from the target VM, address: '127.0.0.1:7367', transport: 'socket'

Process finished with exit code -1

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