@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：

/**
 * @author sunhan
 */
@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();
    }
}

参考：
https://stackoverflow.com/questions/52321988/best-practice-for-value-fields-lombok-and-constructor-injection