springboot如何读取模板文件

templateDir: template/

  Resource resource = new ClassPathResource(templateDir + templateName);

 ResourceLoader resourceLoader = new DefaultResourceLoader();
 Resource resource = resourceLoader.getResource("classpath:template/"+templateName);
 InputStream inputStream =resource.getInputStream() ;

 Resource resource = new PathResource(templateDir + "黑灰数据分享模板.xls");
        File file = resource.getFile();

server.port=8080
spring.datasource.url=jdbc:Mysql://localhost:3306/demo
spring.datasource.username=root
spring.datasource.passWord=root
# 演示内容  
demo.username=test
demo.password=test

server:
  port: 8080
spring:
  datasource:
    url: jdbc:mysql://localhost:3306/demo
    username: root
    password: root
    
# 演示内容    
demo:
  username: test
  password: test   

// 其他包
import org.springframework.beans.factory.annotation.Value;
@Component
public class ReadConfigValueDemo {
 
 @Value("${demo.username}")
    private String username;
 
 @Value("${demo.password}")
    private String password;
 // 业务代码
  
}

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

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
@Component
@ConfigurationProperties(prefix="demo")
public class DemoConfig {
    private String username; 
    private String password;
 public String getUsername() {
        return username;
    }
 public String getPassword() {
        return password;
    }
}

@Service
public class DemoServiceImpl{
 @Resource
    private DemoConfig demoConfig;
    public void test() {
     // 读取配置Bean中的值
  System.out.println(demoConfig.getUsername());
 }
}

# 当前启用dev配置文件
spring:
  profiles:
    active: dev

@Profile("dev") // 仅在dev环境下生效
@Component
@ConfigurationProperties(prefix="demo")
public class DemoConfig {
 // ...属性  
}

@Profile("!prod") // prod环境下不生效
@Component
@ConfigurationProperties(prefix="demo")
public class DemoConfig {
 // ...属性
}