@SpringBootApplication
这是开启SpringBoot项目的首要注解
@SpringBootApplication
public class SpringbootLearningApplication {
public static void main(String[] args) {
SpringApplication.run(SpringbootLearningApplication.class, args);
}
}@Autowired
装配容器内对应的bean,自动导入到当前对象
@RestController
public class IndexController {
@Autowired
private TestService testService;
}@Service
一般标记业务层组件
@Service
public class TestService {
}@Repository
一般标记持久层组件
@Repository
public class TestDao {
}@Controller
对应SpringMVC层
@Controller
public class IndexController {
}@RestController
该注解是@Controller和@ResponseBody的结合体，将响应数据直接塞到响应体里面
@RestController
public class IndexController {
}@Configuration
对应Spring 的Beans定义
@Configuration
public class TestConfiguration {
}@Bean
对应xml中的bean定义
@Configuration
public class TestConfiguration {
@Bean
public TestHelper testHelper(){
return new TestHelper();
}
}@RequestMapping
定义uri，接口的访问地址
@RequestMapping("/helloworld")
public String helloWorld(){
return "helloWorld";
}@GetMapping
只允许get方式请求
@GetMapping("/helloworld")
public String helloWorld(){
return "helloWorld";
}@PostMapping
只允许post方式请求
@PostMapping("/helloworld")
public String helloWorld(){
return "helloWorld";
}@DeleteMapping
只允许delete方式请求
@DeleteMapping("/helloworld")
public String helloWorld(){
return "helloWorld";
}@PatchMapping
只允许patch方式请求
@PatchMapping("/helloworld")
public String helloWorld(){
return "helloWorld";
}@PutMapping
只允许put方式请求
@PutMapping("/helloworld")
public String helloWorld(){
return "helloWorld";
}@PathVariable
接收占位符方式传参
@GetMapping("/helloworld/{name}/{age}")
public String helloWorld(@PathVariable("name") String name,@PathVariable("age") String age){
return name;
}@RequestParam
接受url中的参数
public String helloWorld(@RequestParam String name){
return name;
}@RequestBody
接收请求体里面的参数,一般用来接收json字符串转化为实体对象
public String helloWorld(@RequestBody User user){
return user.getName();
}@value
读取配置文件的变量
@Value("${name}")
private String name;@ConfigurationProperties
整体读取配置文件的变量
@Configuration
@ConfigurationProperties(prefix = "user")
public class UserConfig {
private String userName;
private String age;
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
}@Autowired
private UserConfig userConfig;
