项目总结27：properties配置文件的读取(源码)

项目总结27：properties配置文件的读取(源码)

前言 

使用properties文件配置的好处在于，可以统一管理一些可能会进行调整的参数；

直接上源码

配置文件：thirdpartyconfig.properties； 直接放在 resources目录下；

#这个配置类是为了配置实验室第三方对接的数据
lab_data_ws_url=http://XXX.XX.com:8000/Webjy.asmx/GetDataBYSyXX

配置读取类：ThirdPartyConfig；项目启动时，读取配置文件

package com.hs.api.service.thirdparty;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;
import java.util.Properties;


public class ThirdPartyConfig {
    private static final Logger log = LoggerFactory.getLogger(ThirdPartyConfig.class);

    private static Properties properties = new Properties();

    private static final String SYSTEM_CONFIG_NAME = "thirdpartyconfig.properties";

    private static ThirdPartyConfig singleton = new ThirdPartyConfig();    //在定义变量时就将其实例化

    private ThirdPartyConfig(){
        //System.out.println("构造函数被调用");
    }
     
    public static ThirdPartyConfig getInstance(){
        return singleton;
    }
    
    public static void load(){
      String filePath = null;
      String confPath = System.getenv().get("CONFIG_PATH");
      if(null == confPath){
          load(SYSTEM_CONFIG_NAME);
      }else{
          //System.out.println("进这里就读了环境变量--->"+confPath);
          if (!confPath.endsWith(File.separator)) {
              confPath = confPath + File.separator;
          }
          filePath = confPath + SYSTEM_CONFIG_NAME;
          File file = new File(filePath);
          if(file.exists()){
              InputStream is = null;
              try {
                  is = new FileInputStream(file);
                  properties.load(is);
              }catch (FileNotFoundException e) {
                  log.warn("The config file '" + filePath + "' does not exist.",e);
              }catch (IOException e) {
                    log.warn("Failed to load the settings from the file: " + filePath);
              }finally {
                  if (is != null) {
                      try {
                          is.close();
                      } catch (IOException e){}
                  }
              } 
          }else{
              load(SYSTEM_CONFIG_NAME);
          }
      }
    }
    
    public static void load(String path){
        //System.out.println("进这里就没做配置分离--->"+path);
        try {
            properties.load(ThirdPartyConfig.class.getResourceAsStream("/" + path));
        } catch (FileNotFoundException e) {
            log.warn("The config file core-config.properties does not exist.");
        } catch (IOException e) {
            log.warn("Failed to load the settings from the file: core-config.properties");
        }
    }
    
    static {
        load();
    }
    
    public static String getConfig(String key) {
        return properties.getProperty(key);
    }
    
    public static void main(String args[]){
        System.out.println(ThirdPartyConfig.getConfig("lab_data_ws_url"));
    }
}

 配置外放类：ThirdPartyConfigUtil；其他业务类可以通过ThirdPartyConfigUtil获取需要的参数

package com.hs.api.service.thirdparty;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;


    public class ThirdPartyConfigUtil {

    private static final Log log = LogFactory.getLog(ThirdPartyConfigUtil.class);


    //实验数据
    public String lab_data_ws_url = "";//webservice的URL
    
    
    private static final ThirdPartyConfigUtil single = new ThirdPartyConfigUtil();
     //饿汉式单例类.在类初始化时，已经自行实例化  
    public static ThirdPartyConfigUtil getInstance() {
        return single;
    } 
    
    private ThirdPartyConfigUtil() {
        initPropertis();
    }

    private void initPropertis(){
        lab_data_ws_url = ThirdPartyConfig.getConfig("lab_data_ws_url");
    }

}

测试类

package com.hs.api.service.thirdparty;

/* *
 *@Description:
 *@Author:TYJ
 *@Date: create in  2019/5/28 11:24
 */

public class test {

    public static void main(String[] args) {
        System.out.println(ThirdPartyConfigUtil.getInstance().lab_data_ws_url);
        //日志输出：http://XXX.XX.com:8000/Webjy.asmx/GetDataBYSyXX
    }
}