Spring boot 注解

@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

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@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）

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@RestController

用于标注控制层组件，等同于@ResponseBody+@Controller

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@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

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@Autowired

自动导入依赖的bean

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@Value

注入application中配置的属性值

@Value(value = “#{message}”) 
private String message;

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@Bean

用@Bean标注方法等价于XML中配置的bean。

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@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。

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@PathVariable

获取url中的数据

RequestMapping(“user/get/mac/{macAddress}”) 
public String getByMacAddress(@PathVariable String macAddress){ 
//do something; 
} 

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@RequestParam

获取请求中传过来的值

@RequestParam(Value = "id", required = false, defaultValue =0)

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@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;
    }
    
}