简化Spring开发

入门案例

创建工程

创建Controller类

@RestController
@RequestMapping("/books")
public class BookController {
    @GetMapping("/{id}")
    public String getById(@PathVariable Integer id){
        System.out.println(id);
        return "hello world SpringBoot";
    }
}

完成

启动app程序，用postman发请求即可看到功能已实现。

起步依赖

切换功能

配置文件格式

读取数据

例如在yml中有如下配置

lesson: SpringBoot

server:
  port: 80

enterprise:
  name: 111
  age: 11
  tel: 123
  subject:
    - aa
    - 22
    - cc

读取数据有如下几种方式

用变量加入@Value注解，或者创建environment变量进行自动装配

@RestController
@RequestMapping("/books")
public class BookController {

    @Value("${lesson}")
    private String lesson;

    @Autowired
    private Environment environment;

    @GetMapping("/{id}")
    public String getById(@PathVariable Integer id){
        System.out.println(id);
        System.out.println(lesson);
        System.out.println(environment.getProperty("enterprise.subject[0]"));
        return "hello world SpringBoot";
    }
}

或者创建实体类并添加注解

1 2	@Component @ConfigurationProperties(prefix = "enterprise")

然后直接自动装配即可使用

@RestController
@RequestMapping("/books")
public class BookController {

    @Value("${lesson}")
    private String lesson;

    @Autowired
    private Environment environment;

    @Autowired
    private EnterPrise enterPrise;

    @GetMapping("/{id}")
    public String getById(@PathVariable Integer id){
        System.out.println(id);
        System.out.println(lesson);
        System.out.println(environment.getProperty("enterprise.subject[0]"));
        System.out.println(enterPrise);
        return "hello world SpringBoot";
    }
}

环境更改

按如下方式写

spring:
  profiles:
    active: dev

---

spring:
  config:
    activate:
      on-profile: dev

server:
  port: 9001

---

spring:
  config:
    activate:
      on-profile: pro

server:
  port: 9002

---

spring:
  config:
    activate:
      on-profile: test

server:
  port: 9003