有时候有这样子的情景，我们想把配置文件的信息，读取并自动封装成实体类，这样子，我们在代码里面使用就轻松方便多了，这时候，我们就可以使用@ConfigurationProperties，它可以把同类的配置信息自动封装成实体类
首先在配置文件里面，这些信息是这样子滴
connection.username=admin connection.password=kyjufskifas2jsfs connection.remoteAddress=192.168.1.1
这时候我们可以定义一个实体类在装载配置文件信息
@Component
@ConfigurationProperties(prefix="connection")
public class ConnectionSettings {
private String username;
private String remoteAddress;
private String password ;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getRemoteAddress() {
return remoteAddress;
}
public void setRemoteAddress(String remoteAddress) {
this.remoteAddress = remoteAddress;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
我们还可以把@ConfigurationProperties还可以直接定义在@bean的注解上，这是bean实体类就不用@Component和@ConfigurationProperties了
@SpringBootApplication
public class DemoApplication{
//...
@Bean
@ConfigurationProperties(prefix = "connection")
public ConnectionSettings connectionSettings(){
return new ConnectionSettings();
}
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
然后我们需要使用的时候就直接这样子注入
@RestController
@RequestMapping("/task")
public class TaskController {
@Autowired ConnectionSettings conn;
@RequestMapping(value = {"/",""})
public String hellTask(){
String userName = conn.getUsername();
return "hello task !!";
}
}
如果发现@ConfigurationPropertie不生效，有可能是项目的目录结构问题，
你可以通过@EnableConfigurationProperties(ConnectionSettings.class)来明确指定需要用哪个实体类来装载配置信息
@Configuration
@EnableConfigurationProperties(ConnectionSettings.class)
public class MailConfiguration {
@Autowired private MailProperties mailProperties;
@Bean public JavaMailSender javaMailSender() {
// omitted for readability
}
}