SpringBoot学习9 - 随机数RandomValuePropertySource

1. 随机数RandomValuePropertySource

官方文档： https://docs.spring.io/spring-boot/docs/current/reference/html/features.html#features.external-config.random-values
 
作用： 可注入到配置文件中

文档入口

使用1：方法调用

    @Test
    public void test1() {

        RandomValuePropertySource test = new RandomValuePropertySource("test");

        Console.log("数字格式必须遵守：要么random.数字类型，要么random.[数字类型][分隔符1][最小数字],[最大数字][分隔符2]");
        Console.log("\n===========随机的int数字===========");
        Console.log("=====不限定范围====");
        Integer intNum = (Integer) test.getProperty("random.int");
        Console.log(intNum);
        Console.log("=====限定范围（左闭右开）下面两个表达的意思是一样的====");
        intNum = (Integer) test.getProperty("random.int(1,2)");
        Console.log(intNum);
        intNum = (Integer) test.getProperty("random.int[1,2)");
        Console.log(intNum);

        Console.log("\n===========随机的long数字===========");
        Console.log("=====不限定范围====");
        Long longNum = (Long) test.getProperty("random.long");
        Console.log(longNum);
        Console.log("=====限定范围（左闭右开）====");
        longNum = (Long) test.getProperty("random.long(100,200)");
        Console.log(longNum);

        Console.log("\n===========随机的uuid===========");
        String uuid = (String) test.getProperty("random.uuid");
        Console.log(uuid);

        Console.log("\n===========随机的md5字符串===========");
        String md5 = (String) test.getProperty("random.");
        Console.log(md5);
        md5 = (String) test.getProperty("random.");
        Console.log(md5);
        md5 = (String) test.getProperty("random.rwewerwerewre");
        Console.log(md5);
    }
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使用2：注入到配置文件中

注意： 每次调用获取都会不一样，或者在不同的组件Bean中注入也不一样

 
application.yml

my:
  num: ${random.long}
  num2: ${random.int(100,200)}
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Environment获取

Spirngboot226ApplicationTests.java

@SpringBootTest
class Spirngboot226ApplicationTests {

    @Autowired
    Environment environment;
    
    @Test
    void contextLoads5() {

        String property = environment.getProperty("my.num");
        Console.log(property);

        property = environment.getProperty("my.num");
        Console.log(property);
        
        property = environment.getProperty("my.num2");
        Console.log(property);        

        property = environment.getProperty("my.num2");
        Console.log(property);


    }

}
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@Value注入

TestController.java

@RequestMapping("test")
@Controller
@Getter
public class TestController {

    @Value("${my.num}")
    Long random;
    
}
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Test2Controller.java

@RequestMapping("test")
@Controller
@Getter
public class Test2Controller {

    @Value("${my.num}")
    Long random;
    
}
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Spirngboot226ApplicationTests.java

@SpringBootTest
class Spirngboot226ApplicationTests {

    @Autowired
    TestController testController;

    @Autowired
    Test2Controller test2Controller;

    @Test
    void contextLoads8() {

        Long random = testController.getRandom();
        Console.log(random);

        random = testController.getRandom();
        Console.log(random);

        random = test2Controller.getRandom();
        Console.log(random);

        random = test2Controller.getRandom();
        Console.log(random);

    }

}
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