使用springboot在工具类中读取配置文件(ClassPathResource)

spring.activemq.broker-url=tcp://localhost:61616
spring.activemq.user=admin
spring.activemq.password=admin
spring.activemq.in-memory=true
spring.activemq.pool.enabled=false

package com.jeff.utils;
import java.io.IOException;
import java.util.Properties;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.support.PropertiesLoaderUtils;
public class PropertiesUtil {
	private static String user;
	static {
		System.out.println("application.properties属性文件读取开始");
		ClassPathResource resource = new ClassPathResource("application.properties");
		try {
			Properties properties = PropertiesLoaderUtils.loadProperties(resource);
			user = properties.getProperty("spring.activemq.user");
			System.out.println("user的值：" + user);
		} catch (IOException e) {
			System.out.println("application.properties属性文件读取异常" + e);
		}
		System.out.println("application.properties属性文件读取完成");
	}
	public static String getUser() {
		System.out.println("获取user的值：" + user);
		return user;
	}
}

package com.jeff.controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.jeff.utils.PropertiesUtil;
@RestController
public class MyController {
	@RequestMapping("myTest")
	public String myTest() {
		PropertiesUtil.getUser();
		return "success";
	}
}

import javax.annotation.PostConstruct;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.env.Environment;
import org.springframework.stereotype.Component;
/**
 * 
 * @Description: 配置常量类——根据不同的spring-profile加载不同的配置
 * @author: eric.zhang
 * @date: 2018年7月20日 上午10:59:24
 */
@Component
public class ConfigConstant {
  @Autowired
  private Environment env;
  
  public static String url;
  public static String param;
  
  @PostConstruct
  public void readConfig() {
    url = env.getProperty("config.url");
    param = env.getProperty("config.param");
  }
}

import java.io.UnsupportedEncodingException;
import java.lang.reflect.Field;
import javax.annotation.PostConstruct;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.env.Environment;
import org.springframework.stereotype.Component;
/**
 * 
 * @Description: 配置常量类——根据不同的spring-profile加载不同的配置,变量名要与配置文件里写的名一致
 * @author: eric.zhang
 * @date: 2018年7月20日 上午10:59:24
 */
@Component
public class ConfigConstant {
  @Autowired
  private Environment env;
  
  public static String url;
  public static String name;
  
  
  @PostConstruct
  public void readConfig() throws Exception {
    String prefix = "config.";
    Field[] fields = ConfigConstant.class.getFields();
    for(Field field : fields ){
      field.set(null, getProperty(prefix + field.getName()));
    }
  }
  
  private String getProperty(String key) throws UnsupportedEncodingException {
    return new String(env.getProperty(key).getBytes("ISO-8859-1"), "UTF-8");
  }
}

import java.io.InputStreamReader;
import java.lang.reflect.Field;
import java.util.Properties;
/**
 * 
 * @Description: 配置常量类——根据不同的spring-profile加载不同的配置
 *               变量名把配置文件的key中的"."替换成"_"命名
 * @author: eric.zhang
 * @date: 2018年7月20日 上午10:59:24
 */
public class ConfigConstant {
  public static String CONFIG_URL;
  public static String CONFIG_NAME;
  static {
    try {
      Properties props = new Properties();
      props.load(new InputStreamReader(
          ConfigConstant.class.getClassLoader().getResourceAsStream("application.properties"),
          "UTF-8"));
      String profile = props.getProperty("spring.profiles.active");
      String envFile = "application-" + profile + ".properties";
      Properties envProps = new Properties();
      envProps.load(new InputStreamReader(
          ConfigConstant.class.getClassLoader().getResourceAsStream(envFile), "UTF-8"));
      Field[] fields = ConfigConstant.class.getFields();
      for (Field field : fields) {
        field.set(null, envProps.getProperty(field.getName().replace("_", ".").toLowerCase()));
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}