Spring-Boot常用注解

• • @SpringBootApplication
  • @Controller
  • • 配置文件
  • @RestController
  • @Service
  • @Component
  • @Autowrited
  • @Resource
  • @Bean
  • @Configuration
  • @CrossOrigin
  • @Value

@SpringBootApplication
public class AnnotationApplication {

    public static void main(String[] args) {
        SpringApplication.run(AnnotationApplication.class, args);
    }

}

前后端不分离时候使用这个注解

spring.mvc.view.prefix=/
spring.mvc.view.suffix=.html
# 先引入freemarker的包
spring.freemarker.suffix=.html
spring.freemarker.template-loader-path=classpath:/static/

@Controller
public class ViewController {

    public static final String PAGE = "view";

    @RequestMapping("view") // url: http:localhost:8080/view
    public String view(){

        return PAGE;
    }

    @RequestMapping("data")
    public ModelAndView data(){

        ModelAndView view = new ModelAndView(PAGE);

        view.addObject("str1","我叫Hello");
        view.addObject("str2","我叫张三");
        return view;
    }
}

前后端分离时使用，用于给前端返回数据

@RestController
@RequestMapping("action")
public class UserActionController {

    @Resource(name = "adminService")
    private UserService userService;

    @Value("${local.username}")
    private String val;

    //@Autowired()
    //@Qualifier("name")
    //相当于
    //@Resource(name = "name")

//    @Controller
//    
//    @PostMapping
//    @ResponseBody
//    相当于
//    @RestController
//    
//    @PostMapping
  

    @GetMapping("get")
    public User get(){
//        userService = new UserServiceImpl();
        return userService.get();
    }

    @GetMapping("get/{id}")
    public User getbyId(@PathVariable("id") int id,@RequestParam(value = "id", required = false, defaultValue = "122") int id){
        User user = new User(id, "张三--byId", "男", 25);
        System.out.println("user = " + user);
        return user;
    }

    @PostMapping("add")
    @CrossOrigin
    public User add(@RequestBody User user){
        System.out.println("user = " + user);
        return user;
    }
	@PostMapping("add2")
    public User add2(User user){
        System.out.println("user = " + user);
        return user;
    }
}

注册Bean

注册Bean

获取Bean

获取Bean

+@Bean 注册Bean

解决跨域问题，但是不推荐使用，应该使用全局过滤器配置

从配置文件中获取值