java - Spring，无法更改 @RequestScope 服务的值

Question

我正在尝试创建一个日志服务来存储两个变量，我将在 http 请求的生命周期中使用它们。问题是我无法更改字段。我尝试了 setter 、初始化方法，我可以在调试器中看到值的变化，但在退出方法后，字段为空

唯一的原因是我没有修改同一个对象，但我有RequestScope....

@Service
@RequestScope
public class LogService {

    private String id;
    private String type;

    public void init(String id, String type) {
       this.id = id;
       this.type = type;
    }
}


@RestController
@RequestMapping("/")
@AllArgsConstructor
public class Controller {

    private OtherService otherService;
    private LogService logService;

    @PostMapping(value = "create", produces = MediaType.APPLICATION_JSON_VALUE, consumes = MediaType.APPLICATION_JSON_VALUE)
    public ResponseEntity create(@RequestBody BodyObject body) {

       /* in the debugger i can see that the values are set in the object but after getting out of the logService.init the object the variables are null */
        logService.init("service", body.getId());

         /* here both fields are null and also inside other services using the  logService */
         otherService.execute(body);
        .....
    }

Answer 1

无法重现。这里已满Minimal, Reproducible Example :

@Service
@RequestScope
public class LogService {

    private String id;
    private String type;

    @SuppressWarnings("hiding")
    public void init(String id, String type) {
        this.id = id;
        this.type = type;
    }

    public String getId() {
        return this.id;
    }

    public String getType() {
        return this.type;
    }

    @Override
    public String toString() {
        return "LogService[id=" + this.id + ", type=" + this.type + "]";
    }

}

@Service
public class ScopeService {

    @Autowired
    private LogService logService;

    public void test() {
        System.out.println("ScopeService: " + this.logService);
        System.out.println("  id=" + this.logService.getId() + ", type=" + this.logService.getType());
    }

}

@RestController
public class ScopeController {

    @Autowired
    private ScopeService scopeService;
    @Autowired
    private LogService logService;

    @GetMapping("/dmz/scope")
    public String create(@RequestParam String id, @RequestParam String type) throws InterruptedException {
        this.logService.init(id, type);
        Thread.sleep(10000);
        this.scopeService.test();
        return this.logService.toString();
    }

}

Thread.sleep() 用于测试并行 Web 请求处理，以确保 LogService 确实处于请求范围内。

因此我使用以下 2 个 URL，彼此在 10 秒内提交:
http://localhost:8080/dmz/scope?id=1&type=TEST1
http://localhost:8080/dmz/scope?id=2&type=TEST2

它们返回的页面显示:LogService[id=1, type=TEST1]
和:LogService[id=2，type=TEST2]

我的日志显示:

2020-05-01 13:10:29.117 DEBUG 5888 --- [nio-8080-exec-1] o.s.w.f.CommonsRequestLoggingFilter      : Before request [GET /dmz/scope?id=1&type=TEST1]
2020-05-01 13:10:30.312 DEBUG 5888 --- [nio-8080-exec-2] o.s.w.f.CommonsRequestLoggingFilter      : Before request [GET /dmz/scope?id=2&type=TEST2]
ScopeService: LogService[id=1, type=TEST1]
  id=1, type=TEST1
2020-05-01 13:10:39.162  INFO 5888 --- [nio-8080-exec-1] shared.EventLogger                       : EVENT: ServletRequestHandledEvent
2020-05-01 13:10:39.162 DEBUG 5888 --- [nio-8080-exec-1] o.s.w.f.CommonsRequestLoggingFilter      : REQUEST DATA : GET /dmz/scope?id=1&type=TEST1]
ScopeService: LogService[id=2, type=TEST2]
  id=2, type=TEST2
2020-05-01 13:10:40.319  INFO 5888 --- [nio-8080-exec-2] shared.EventLogger                       : EVENT: ServletRequestHandledEvent
2020-05-01 13:10:40.320 DEBUG 5888 --- [nio-8080-exec-2] o.s.w.f.CommonsRequestLoggingFilter      : REQUEST DATA : GET /dmz/scope?id=2&type=TEST2]