1、Spring Boot的Controller使用

(1)@Controller ---處理http請求

(2)@RestController---Spring4之後新加的註解，原來返回json需要 @ResponseBody配合@Controller

(3)RequestMapping配置url對映

(4)PathVariable獲取url中的資料

(5)RequestParam獲取請求引數的值

(6)GetMapping  組合註解

GirlProperties.java(在src/main/java/com.example包中)

package com.example;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
@Component
@ConfigurationProperties(prefix="girl")
public class GirlProperties {
    private String cupSize;
    private Integer age;
    public String getCupSize() {
        return cupSize;
    }
    public GirlProperties setCupSize(String cupSize) {
        this.cupSize = cupSize;
        return this;
    }
}
 

application.yml(在src/main/resources包下)

server:
  port: 8081
girl:
  cupSize: B
  age: 18

GirlController.java

package com.example;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
@ResponseBody
public class GirlController {
    @Autowired
   private GirlProperties girlProperties;
    @RequestMapping(value="/hello")
    public String say() {
        return girlProperties.getCupSize();
    }
}
 

GirlApplication.java

package com.example;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication//開啟自動配置
public class GirlApplication {
   //main方法作用：作為專案啟動的入口
   public static void main(String[] args) {
      SpringApplication.run(GirlApplication.class, args);
   }
}
 

執行GirlApplication.java結果：