spring-boot-configuration-processor加载配置文件注入controller

傷城~ 2023-07-01 08:51 29阅读 0赞

个人经常使用@Value注解的方式，其实springboot提供另外一种更加优雅的方式，就是我们现在要讲的  
在pom.xml文件中增加如下依赖。

<dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-configuration-processor</artifactId>
            </dependency>

在我们的对象上加入以下注解，我们就可以在controller层注入我们的对象

package com.hbk.springbootmail.model;
    
    import org.springframework.boot.context.properties.ConfigurationProperties;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.context.annotation.PropertySource;
    
    @Configuration
    @ConfigurationProperties(prefix = "com.hbk")
    @PropertySource(value = "classpath:hbk.properties")
    public class Hbk {
        private String author;
        private int age;
        private String address;
    
        public String getAuthor() {
            return author;
        }
    
        public void setAuthor(String author) {
            this.author = author;
        }
    
        public int getAge() {
            return age;
        }
    
        public void setAge(int age) {
            this.age = age;
        }
    
        public String getAddress() {
            return address;
        }
    
        public void setAddress(String address) {
            this.address = address;
        }
    
        @Override
        public String toString() {
            return "Hbk{" +
                    "author='" + author + '\'' +
                    ", age=" + age +
                    ", address='" + address + '\'' +
                    '}';
        }
    }

hbk.properties文件放到工程resources目录下，因为编译会在classpath，内容如下：

com.hbk.author=huangbaokang
    com.hbk.age=30
    com.hbk.address=ganzhou

package com.hbk.springbootmail.controller;
    
    import com.hbk.springbootmail.model.Hbk;
    import com.hbk.springbootmail.model.User;
    import org.springframework.beans.BeanUtils;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    import java.util.Date;
    import java.util.HashMap;
    import java.util.Map;
    
    @RestController
    @RequestMapping("/user")
    public class UserController {
        @Autowired
        private Hbk hbk;
    
        @GetMapping("/hello")
        public User hello(){
            User user = new User();
            user.setId(1);
            user.setBirthday(new Date());
            user.setName("huangbaokang222");
            user.setPassword("123456");
            user.setDesc("描述2");
            return user;
        }
    
        @GetMapping("/test")
        public Hbk test(){
            Hbk result = new Hbk();
            BeanUtils.copyProperties(hbk, result);
            return result;
            // 直接return hbk会报序列化的问题，在这里new了一个对象，通过拷贝的方式解决了此问题。
        }
    }

浏览器访问localhost:8008/user/test  
![在这里插入图片描述][20200120172750397.png]

[20200120172750397.png]: https://img-blog.csdnimg.cn/20200120172750397.png