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();

     }

   }

}