spring boot学习(7)— 配置信息的获取方式

1. 使用 ConfigurationProperties 来使用 properties 的值。

启用自定义配置：@Configuration @EnableConfigurationProperties({YourConfigClass}.class)

@ConfigurationProperties(prefix) 注解自定义的 YourConfigClass

通过 bean 来使用自定义的配置信息类

@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
这样就可以通过 Bean 来使用。
2. 通过 @Value 使用
通过注解 @Value(“${testconfig.first}”) 可以给变量赋值成 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);
}
}

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