@AllArgsConstructor与@Value共用的问题解决
平时我们用lombok的方式来实现Bean的构造函数方式的注入,但是当遇到@Value注解的时候,就会出现问题,看下面这段代码:
@RestController @AllArgsConstructor @RequestMapping("test") public class TestController { @Value("${test}") private String test; private TestService testService; @GetMapping() public String get() { System.out.println(test); return testService.get(); } }
启动项目的时候,会抛出异常
*************************** APPLICATION FAILED TO START *************************** Description: Parameter 0 of constructor in com.good.base.controller.TestController required a bean of type 'java.lang.String' that could not be found. Action: Consider defining a bean of type 'java.lang.String' in your configuration.
如何解决这个问题呢?
其实很简单,将AllArgsConstructor改成RequiredArgsConstructor,然后把需要注入的bean改成final类型的,就可以了
@RestController @RequiredArgsConstructor @RequestMapping("test") public class TestController { @Value("${test}") private String test; private final TestService testService; @GetMapping() public String get() { System.out.println(test); return testService.get(); } }
愿你眼中有光芒,活成你想要的模样