(C), Spring Boot read the data in the configuration file

A, Spring Boot applicaion.properties reading the configuration file and the data file application.yml

Application.properties contents of the file are as follows:

book.name = SpringCloudInAction
book.author = HDN

1, read by @Value comment

     1.1, a configuration that it is loaded into Spring Bean Ioc container

/**
 * @author HDN
 * @date 2019/6/14 14:37
 */
@Component
public class Book {
    @Value("${book.name}")
    private String name;
    @Value("${book.author}")
    private String author;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }
}

     1.2, to obtain the value in the configuration file by implanting Book

/**
 * @author HDN
 * @date 2019/6/5 16:19
 */
@RestController
@RequestMapping("/controller")
public class HelloController {
    @Autowired
    Book book;

    @RequestMapping("/getProperties")
    public String getProperties(){
        return "1、通过@Value注解获取配置文件的属性值："+book.getName()+"----"+book.getAuthor()+"<p>"+
    }
}

     1.3, the results are as follows:

2, the configuration file to read the contents of the object by injecting Environment

      2.1, direct injection Environment object can be obtained in accordance with a value corresponding getProperty (param) Method

              param: = foregoing configuration file attributes (key attributes)

/**
 * @author HDN
 * @date 2019/6/5 16:19
 */
@RestController
@RequestMapping("/controller")
public class HelloController {
    @Autowired
    Book book;

    @Autowired
    Environment env;

    @RequestMapping("/getProperties")
    public String getProperties(){
        return "1、通过@Value注解获取配置文件的属性值："+book.getName()+"----"+book.getAuthor()+"<p>"+
                "2、通过Environment注入对象来获取配置文件属性值："+env.getProperty("book.name")+"----"+env.getProperty("book.author")+"<p>"+
    }
}

       2.2, the results are as follows:

3, to read the contents of the configuration file by @ConfigurationProperties

     3.1, a configuration that it Ioc Bean Spring loaded into the container

/**
 * @author HDN
 * @date 2019/6/14 15:25
 */
@Component
@ConfigurationProperties(prefix = "book")
public class BookConfigPro {
    private String name;

    private String author;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }
}

      3.2, to obtain the value in the configuration file by implanting BookConfigPro

/**
 * @author HDN
 * @date 2019/6/5 16:19
 */
@RestController
@RequestMapping("/controller")
public class HelloController {
    @RequestMapping("/hello")
    public String hello(){
        return "Hello World!";
    }

    @Autowired
    Book book;

    @Autowired
    Environment env;

    @Autowired
    BookConfigPro bookConfigPro;

    @RequestMapping("/getProperties")
    public String getProperties(){
        return "1、通过@Value注解获取配置文件的属性值："+book.getName()+"----"+book.getAuthor()+"<p>"+
                "2、通过Environment注入对象来获取配置文件属性值："+env.getProperty("book.name")+"----"+env.getProperty("book.author")+"<p>"+
                "3、通过@ConfigurationProperties注解获取配置文件属性："+bookConfigPro.getName()+"----"+bookConfigPro.getAuthor();
    }
}

      3.3, the results are as follows:

  

Second, if you have your own defined configuration files, such as config.properties, you want to use @PropertySource (value = "config.properties") annotation to load custom configuration file content.

Two elements worth noting here: First, the file can not be used @PropertySource YAML annotations; second, if from the same profile and configuration application.properties defined preferentially loads the contents of the configuration file application.properties.