springboot之生成随机值

怼烎@ 2022-10-07 00:59 198阅读 0赞

## 1：作用 ##

用于生成随机值，比如生成随机的字符串，数字等，如果是在项目中有这种需求的话可以考虑使用这种方式来实现。

## 2：例子 ##

### 2.1：定义bean ###

@Component
    public class MyBean implements CommandLineRunner { 
    
        @Value("${random.value}")
        private String mySecret;
    
        @Value("${my.number}")
        private Integer myNumber;
    
        @Value("${my.bignumber}")
        private long myBignumber;
    
        @Value("${my.uuid}")
        private String myUuid;
    
        @Value("${my.number.less.than.ten}")
        private String myNumberLessThanTen;
    
        @Value("${my.number.in.range}")
        private String myNumberInRange;
    
    
        @Override
        public void run(String... args){ 
            System.out.println("mySecret:"+mySecret);
            System.out.println("myNumber:"+myNumber);
            System.out.println("myBignumber:"+myBignumber);
            System.out.println("myUuid:"+myUuid);
            System.out.println("myNumberLessThanTen:"+myNumberLessThanTen);
            System.out.println("myNumberInRange:"+myNumberInRange);
        }
    }

> 这里实现org.springframework.boot.CommandLineRunner接口，只是为了方便看结果，仅此而已！！！

### 2.2：定义配置 ###

my.secret=${random.value}
    my.number=${random.int}
    my.bignumber=${random.long}
    my.uuid=${random.uuid}
    my.number.less.than.ten=${random.int(10)}
    my.number.in.range=${random.int[1024,65536]}

### 2.3：运行 ###

...snip...
    2021-06-15 14:19:21.359  INFO 24280 --- [           main] pringbootIntegrationSpringmvcApplication : Started SpringbootIntegrationSpringmvcApplication in 2.127 seconds (JVM running for 2.535)
    mySecret:5301a3d9a7dc6585c1e6ecef9ebec909
    myNumber:-1682194653
    myBignumber:-3035536012830314099
    myUuid:9007f4fd-06fc-431e-a5ab-e78c56498067
    myNumberLessThanTen:0
    myNumberInRange:29250
    ...snip...