java -jar demo.jar --server.port=9000

java -jar demo.jar --spring.application.json='{"foo":"bar"}'

@RestController
@RequestMapping("/task")
public class TaskController {

@Value("${connection.remoteAddress}") private String address;

@RequestMapping(value = {"/",""})
public String hellTask(@Value("${connection.username}")String name){

  return "hello task !!";
}

}

@RestController
@RequestMapping("/task")
public class TaskController {

@Autowired Environment ev ;

@Value("${connection.remoteAddress}") private String address;

@RequestMapping(value = {"/",""})
public String hellTask(@Value("${connection.username}")String name){

  String password = ev.getProperty("connection.password");
  return "hello task !!";
}

}

@Component
public class SystemConfig {

  private static Properties props ;

  public SystemConfig(){

    try {
      Resource resource = new ClassPathResource("/application.properties");//
      props = PropertiesLoaderUtils.loadProperties(resource);
    } catch (IOException e) {
      e.printStackTrace();
    }
  }


  /**
   * 获取属性
   * @param key
   * @return
   */
  public static String getProperty(String key){

    return props == null ? null : props.getProperty(key);

  }

  /**
   * 获取属性
   * @param key 属性key
   * @param defaultValue 属性value
   * @return
   */
  public static String getProperty(String key,String defaultValue){

     return props == null ? null : props.getProperty(key, defaultValue);

  }

  /**
   * 获取properyies属性
   * @return
   */
  public static Properties getProperties(){
    return props;
  }

}

//用的话，就直接这样子
String value = SystemConfig.getProperty("key");

myapp.name=spring
myapp.desc=${myapp.name} nice

my.secret=${random.value}
my.number=${random.int}
my.bignumber=${random.long}
my.number.less.than.ten=${random.int(10)}
my.number.in.range=${random.int[1024,65536]}