package com.it.action;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

@RestController
@RequestMapping("/source")
public class SourceAction {
    @Value("${petshop.name}")
    private String name;
    @Value("${petshop.introduce}")
    private String introduce;
    @Value("${petshop.licences}")
    private List<String> licences;
    @Value("#{${petshop.infos}}")
    private Map<String, String> infos;

    @RequestMapping("/show")
    public Object show() {
        Map<String, Object> map = new LinkedHashMap();
        map.put("name", name);
        map.put("introduce", introduce);
        map.put("licences", licences);
        map.put("infos", infos);
        return map;
    }
}

訪問http://localhost:8080/source/show觀察被注入的屬性：

二、@ConfigurationProperties注解批量注入屬性

@ConfigurationProperties注解用于注入有著相同前綴的屬性，注入的方式也是通過java類的setter方法來完成，但是這種方式缺少了@Value注解的靈活性，也無法結合spel語言進行處理。

例：將application.yml中的以下屬性注入到類中：

## 自定義屬性
petshop:
name: 睿芽寵物
introduce: 種類齊全，安全可靠
licences: 上市許可證,疫苗許可證
infos:
- phone: 36xx102
- address: xx省xx市

新建PetShop類并注入屬性：

package com.it.vo;

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

import java.util.List;
import java.util.Map;

@Data
@Component
@ConfigurationProperties(prefix = "petshop")
public class PetShop {
    private String name;
    private String introduce;
    private List<String> licences;
    private Map<String, String> infos;
}

測試注入的結果：

package com.it.action;

import com.it.vo.PetShop;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/source")
public class SourceAction {
    @Autowired
    private PetShop petShop;

    @RequestMapping("/show")
    public Object show() {
        return petShop;
    }
}

三、注入實體對象

使用@ConfigurationProperties注解可以將關聯的對象一同注入。

修改application.yml文件:

## 自定義屬性
petshop:
name: 睿芽寵物
introduce: 種類齊全，安全可靠
shopInfo:
    phone: 36xx102
    address: xx省xx市
    licences: 上市許可證,疫苗許可證
pets:
    - pet:
      name: 金毛
      price: 3365.21
    - pet:
      name: 巴哥
      price: 2136.10

新建三個java類，并設置好引用關系：

@Data
public class PetShopInfo {
    private String phone;
    private String address;
    private List<String> licences;
}

@Data
public class Pet {
    private String name;
    private double price;
}

@Data
@Component
@ConfigurationProperties(prefix = "petshop")
public class PetShop {
    private String name;
    private String introduce;
    private PetShopInfo shopInfo;
    private List<Pet> pets;
}

測試注入結果：

@RestController
@RequestMapping("/source")
public class SourceAction {
    @Autowired
    private PetShop petShop;

    @RequestMapping("/show")
    public Object show() {
        return petShop;
    }
}

四、自定義文件注入

在resource目錄下新建petshop/petshop.properties文件，將application.yml中的屬性轉換為properties中的key-value格式：

## 自定義屬性
petshop.name=睿芽寵物
petshop.introduce=種類齊全，安全可靠

petshop.shopInfo.phone=36xx102
petshop.shopInfo.address=xx省xx市
petshop.shopInfo.licences=上市許可證,疫苗許可證

petshop.pets[0].name=金毛
petshop.pets[0].price=3365.21

petshop.pets[1].name=巴哥
petshop.pets[1].price=2136.10

修改PetShop類，添加@PropertySource注解導入properties文件

@Data
@Component
@PropertySource(value = "classpath:petshop/petshop.properties", encoding = "UTF-8")
@ConfigurationProperties(prefix = "petshop")
public class PetShop {
    private String name;
    private String introduce;
    private PetShopInfo shopInfo;
    private List<Pet> pets;
}

訪問http://localhost:8080/source/show發(fā)現可以得到與上例相同的結果。