@SpringBootApplication
申明让Spring boot 自动给程序进行必要的配置，这个配置等于：@Configuration ，@EnableAutoConfiguration 和 @ComponentScan
@Controller
用于定义控制类，在Spring项目中将用户发来的url请求转发到对应的服务器接口（Service层）
@RestController
用于标注控制层组件，等同于@ResponseBody+@Controller
@RequestMapping
提供路由信息，负责映射url到具体函数，其组合注解如下：
- @GetMapping
- @PostMapping
- @DeleteMapping
- @PutMapping
@Autowired
自动导入依赖的bean
@Value
注入application中配置的属性值
@Value(value = “#{message}”)
private String message;
@Bean
用@Bean标注方法等价于XML中配置的bean。
@Component
泛指组件，当组件不好归类的时候，我们可以使用这个注解进行标注。
@PathVariable
获取url中的数据
RequestMapping(“user/get/mac/{macAddress}”)
public String getByMacAddress(@PathVariable String macAddress){
//do something;
}
@RequestParam
获取请求中传过来的值
@RequestParam(Value = "id", required = false, defaultValue =0)
@ConfigurationProperties
将配置文件转成对象，yml配置：
spring:
redis:
dbIndex: 0
hostName: 192.168.58.133
password: nmamtf
port: 6379
timeout: 0
poolConfig:
- maxIdle: 8
- minIdle: 0
- maxActive: 8
- maxWait: -1
定义转换对象：
@Component
@ConfigurationProperties(prefix="spring.redis")
public class RedisProps {
private int dbIndex;
@NotNull
private String hostname;
private String password;
@NotNull
private int port;
private long timeout;
private List<Map<String,String>> poolConfig;
public int getDbIndex() {
return dbIndex;
}
public void setDbIndex(int dbIndex) {
this.dbIndex = dbIndex;
}
public String getHostname() {
return hostname;
}
public void setHostname(String hostname) {
this.hostname = hostname;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public int getPort() {
return port;
}
public void setPort(int port) {
this.port = port;
}
public long getTimeout() {
return timeout;
}
public void setTimeout(long timeout) {
this.timeout = timeout;
}
public List<Map<String, String>> getPoolConfig() {
return poolConfig;
}
public void setPoolConfig(List<Map<String, String>> poolConfig) {
this.poolConfig = poolConfig;
}
}
