0

我是 Spring 新手，我正在尝试弄清楚如何在我的 Spring Boot 应用程序中使用环境变量。

当我运行 JAR 时，我收到以下消息：

***************************
APPLICATION FAILED TO START
***************************

Description:

Field fooConfig in com.example.controller.HomeController required a bean of type 'com.example.config.FooConfig' that could not be found.

The injection point has the following annotations:
        - @org.springframework.beans.factory.annotation.Autowired(required=true)


Action:

Consider defining a bean of type 'com.example.config.FooConfig' in your configuration.

我完全不确定我是否正确使用了注释，或者它正在为我的配置 POJO 扫描正确的路径。我希望我可以运行具有更详细输出的 JAR 以查看此信息，但我不知道这是否可行或如何执行此操作。

我有以下类定义：

package com.example;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.properties.ConfigurationPropertiesScan;
import org.springframework.context.annotation.ComponentScan;

@SpringBootApplication
@ComponentScan(basePackages={"com.example.controller"})
@ConfigurationPropertiesScan("com.example.config")
public class Application {
    public static void main(String[] args) throws Exception {
        SpringApplication.run(Application.class, args);
    }
}

package com.example.config;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;
import org.springframework.stereotype.Component;

@Component
@Configuration
@ConfigurationProperties(prefix = "foo")
public class FooConfig {
    private String bar;

    public String getBar() {
        return bar;
    }

    public void setBar(String bar) {
        this.bar = bar;
    }
}

package com.example.controller;

import com.example.config.FooConfig;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HomeController {
    @Autowired
    public FooConfig fooConfig;

    @GetMapping("/")
    public String index() {
        System.out.println(fooConfig.getBar());
        return new FooConfig().getBar();
    }
}

在我的application.properties档案中，

foo.bar=HelloWorld
4

0 回答 0