第十一节：学习通过动态调用application.properties参数配置实体类（自学Spring boot 3.x的第二天）

大家好，我是网创有方。这节实现的效果是通过代码灵活地调用application.properties实现配置类参数赋值。

第一步：编写配置类

package cn.wcyf.wcai.config;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;

@Configuration   //声明是个配置类
public class WechatConfig {
    public String getAppId() {
        return appId;
    }

    public void setAppId(String appId) {
        this.appId = appId;
    }

    public String getToken() {
        return token;
    }

    public void setToken(String token) {
        this.token = token;
    }

    public String getSecretKey() {
        return secretKey;
    }

    public void setSecretKey(String secretKey) {
        this.secretKey = secretKey;
    }
    private String appId;
    private String token;
    private String secretKey;
}

第二步：编写application.properties

spring.application.name=wcai
server.port=80
#用于配置请求controller的path前缀，比如/demo，就是在请求前面加上/demo，留空就不加
server.servlet.context-path=
wechat.app-id=wx4dqdadqqdq
wechat.token=da6644qd44ad72q
wechat.secret-key=7a78d57q4523szd45357

第三步：编写 Controller，通过environment的getProperty动态获取application.properties的参数

@RestController
public class HellowordController {
    @Resource
    ApplicationContext applicationContext;
    @RequestMapping("/helloword")
    public String getHelloword(){
        return "helloword";
    }


        @RequestMapping("/getWechatConfig")
        public WechatConfig getWechatSetting(){
            Environment enr = applicationContext.getEnvironment();
            String appId = enr.getProperty("wechat.app-id");
            String token = enr.getProperty("wechat.token");
            String secret_key = enr.getProperty("wechat.secret-key");
            WechatConfig wechatSetting = new WechatConfig();
            wechatSetting.setAppId(appId);
            wechatSetting.setToken(token);
            wechatSetting.setSecretKey(secret_key);
            return wechatSetting;
    }
}