springboot读取环境变量

准备一个.properties文件user.name=张三user.age=18user.addr=上海user.professional=法师准备一个UserInfo类public class UserInfo {private String name;private String age;private String addr;private String professional;}第一种方

可乐丿不加冰

6550人浏览 · 2022-05-24 17:20:11

可乐丿不加冰 · 2022-05-24 17:20:11 发布

准备一个.properties文件

user.name=张三
user.age=18
user.addr=上海
user.professional=法师

准备一个UserInfo类

public class UserInfo {
    private String name;
    private String age;
    private String addr;
    private String professional;

}

第一种方式：采用下面的注解
@Configuration
@EnableConfigurationProperties(UserInfo.class)
@PropertySource(value = “classpath:userinfo.properties”,encoding = “utf-8”)
@ConfigurationProperties(prefix = “user”)

@Data
@Configuration
@EnableConfigurationProperties(UserInfo.class)
@PropertySource(value = "classpath:userinfo.properties",encoding = "utf-8")
@ConfigurationProperties(prefix = "user")
public class UserInfo {
    private String name;
    private String age;
    private String addr;
    private String professional;

}

测试类：

import com.lcj.common.UserInfo;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;

import javax.annotation.Resource;

@SpringBootTest
class ServletAppTests {

    @Resource
    private UserInfo userInfo;

    @Test
    void test(){
        System.out.println(userInfo.toString());
    }
}

第二种方式：和第一种方式差不多，只是将@Configuration和@EnableConfigurationProperties(UserInfo.class)替换为@Component

@Data
@Component
@PropertySource(value = "classpath:userinfo.properties",encoding = "utf-8")
@ConfigurationProperties(prefix = "user")
public class UserInfo {
    private String name;
    private String age;
    private String addr;
    private String professional;

}

测试结果：

以上两种方式适合配置实体类这种情况

第三种方式：借助Environment 来进行属性的获取

实体类

import lombok.Data;
import lombok.experimental.Accessors;

@Data
@Accessors(chain = true)
public class UserInfo {
    private String name;
    private String age;
    private String addr;
    private String professional;
}

配置类

import com.lcj.common.UserInfo;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.core.env.Environment;

import javax.annotation.Resource;

@Configuration
@PropertySource(value = "classpath:userinfo.properties",encoding = "utf-8")
public class UserConfig {

    @Resource
    private Environment config;

    @Bean
    public UserInfo getUserInfo(){
        return new UserInfo().setName(config.getProperty("user.name1"))
                .setAge(config.getProperty("user.age1"))
                .setAddr(config.getProperty("user.addr1"))
                .setProfessional(config.getProperty("user.professional1"));
    }
}