spring boot學習(7)— 配置信息的獲取方式

1. 使用 ConfigurationProperties 來使用 properties 的值。

1. 啓用自定義配置： @Configuration @EnableConfigurationProperties({YourConfigClass}.class)
2. @ConfigurationProperties(prefix) 註解自定義的 YourConfigClass
3. 通過 bean 來使用自定義的配置信息類

@SpringBootApplication
@EnableConfigurationProperties(TestConfigurationProperties.class)
public class DemoApplication{

    @Autowired
    TestConfigurationProperties testConfig;

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
        new DemoApplication().testConfig.printProperties();
    }

    @PostConstruct
    private void init(){
        testConfig.printProperties();
    }
}

@ConfigurationProperties("testconfig")
public class TestConfigurationProperties {
    private String first;
    private String second;
    private String third;
    private String fourth;
    private String fifth;
    private String sixth;
    private String seventh;
    private String eightth;
    
    //getters and setters

這樣就可以通過 Bean 來使用。

2. 通過 @Value 使用

通過註解 @Value("${testconfig.first}") 可以給變量賦值成 配置 testconfig.first 的信息。

@Component
public class TestValue {

    @Value("${testconfig.first}")
    private String first;

    @Value("${testconfig.second}")
    private String second;

    @Value("${testconfig.third}")
    private String third;

    @Value("${testconfig.fourth}")
    private String fourth;

    @Value("${testconfig.fifth}")
    private String fifth;

    @Value("${testconfig.sixth}")
    private String sixth;

    @Value("${testconfig.seventh}")
    private String seventh;

    @Value("${testconfig.eightth}")
    private String eightth;

    public String getFirst() {
        return first;
    }

    public void setFirst(String first) {
        this.first = first;
    }

    public String getSecond() {
        return second;
    }

    public void setSecond(String second) {
        this.second = second;
    }

    public String getThird() {
        return third;
    }

    public void setThird(String third) {
        this.third = third;
    }

    public String getFourth() {
        return fourth;
    }

    public void setFourth(String fourth) {
        this.fourth = fourth;
    }

    public String getFifth() {
        return fifth;
    }

    public void setFifth(String fifth) {
        this.fifth = fifth;
    }

    public String getSixth() {
        return sixth;
    }

    public void setSixth(String sixth) {
        this.sixth = sixth;
    }

    public String getSeventh() {
        return seventh;
    }

    public void setSeventh(String seventh) {
        this.seventh = seventh;
    }

    public String getEightth() {
        return eightth;
    }

    public void setEightth(String eightth) {
        this.eightth = eightth;
    }

    public void printProperties(){
        System.out.println("\ntest value:");
        System.out.println("first: " + first);
        System.out.println("second: " + second);
        System.out.println("third: " + third);
        System.out.println("fourth: " + fourth);
        System.out.println("fifth: " + fifth);
        System.out.println("sixth: " + sixth);
        System.out.println("seventh: " + seventh);
        System.out.println("eightth: " + eightth);
    }
}

輸出爲：

test value:
first: ./config/
second: ./config/yml
third: classpath/config/
fourth: classpath
fifth: ./config/
sixth: ./config/
seventh: ./config/
eightth: ./config/