SpringBoot把配置文件中的值映射到实体类中

配置文件中配置好需要映射的值

guns: 
  file-upload-path: d:/tmp   //文件上传地址

2.创建实体类

@ConfigurationProperties(prefix = "guns")   prefix：指定需要映射的配置文件  guns：和yml文件中保持一致

@Component:把实体类交给spring管理

package ;

import ;
import ;

import ;
import ;

import static ;
import static ;

/**
 * guns项目配置
 *
 * @author stylefeng
 * @Date 2017/5/23 22:31
 */
@Component
@ConfigurationProperties(prefix = )
public class GunsProperties {

    private String fileUploadPath;  //下划线转驼峰命名


    /**
     * session 失效时间（默认为30分钟 单位：秒）
     */
    private Integer sessionInvalidateTime = 30 * 60;

    /**
     * session 验证失效时间（默认为15分钟 单位：秒）
     */
    private Integer sessionValidationInterval = 15 * 60;

    public String getFileUploadPath() {
        //如果没有写文件上传路径,保存到临时目录
        if (isEmpty(fileUploadPath)) {
            return getTempPath();
        } else {
            //判断有没有结尾符,没有得加上
            if (!()) {
                fileUploadPath = fileUploadPath + ;
            }
            //判断目录存不存在,不存在得加上
            if (!haveCreatePath) {
                File file = new File(fileUploadPath);
                ();
                haveCreatePath = true;
            }
            return fileUploadPath;
        }
    }

    public void setFileUploadPath(String fileUploadPath) {
         = fileUploadPath;
    }

   
}

3.注入使用

//注入实体类
@Autowired
private GunsProperties gunsProperties;

//调用
(());

=admin
=admin
=localhost

5.实体类

@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) {
         = username;
    }
    public String getRemoteAddress() {
        return remoteAddress;
    }
    public void setRemoteAddress(String remoteAddress) {
         = remoteAddress;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String 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) {
        (, args);
    }
}

6.注入使用

@Controller
@RequestMapping("/test")
public class TaskController {

@Autowired ConnectionSettings conn;

@RequestMapping(value ="/dhi")
public String hellTask(){
    String userName = ();     
    return "hello task !!";
}

}