Java获取项目properties配置文件属性、获取外部配置文件，无需重启系统实现刷新配置文件

柔情只为你懂 2022-02-13 19:11 336阅读 0赞

**目标：springboot打包发布后，可以读取jar外部的配置文件中的属性，并实现不重启更新配置文件。**

## 项目结构： ##

![项目结构][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZhbmdjaGFvMjAxMQ_size_16_color_FFFFFF_t_70]

## 实现方法： ##

package com.bdxh.fileserver.utils;
    
    import java.io.UnsupportedEncodingException;
    import java.util.List;
    import java.util.Properties;
    
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
    import org.springframework.core.io.support.PropertiesLoaderUtils;
    
    /** * 功能说明:资源工具类 */
    public final class ConfigMgr { 
    
    	private static Logger logger = LoggerFactory.getLogger(ConfigMgr.class);
    	private static Properties properties = new Properties();
    
    	public static final String LOCATIONS = "file:./config/,file:./,classpath:/config/,classpath:/";
    
    	private static String DEFAULT_MESSAGE = null;
    
    	static { 
    		try { 
    			List<String> locs = IdUtil.splitStrings(LOCATIONS);
    			for (String location : locs) { 
    				properties = loadProperties(location);
    				if (properties != null) { 
    					break;
    				}
    			}
    		} catch (Exception e1) { 
    			logger.error("配置文件加载出错", e1);
    		}
    	}
    
    	public static Properties loadProperties(String location) { 
    		try { 
    			String s = "Load resource file - " + location;
    			logger.info(s);
    			return PropertiesLoaderUtils.loadProperties(new PathMatchingResourcePatternResolver().getResource(location + "application.properties"));
    		} catch (Exception e) { 
    			String s = "Load resource file failed - " + location;
    			logger.error(s);
    			return null;
    		}
    	}
    
    	public static void reloadProperties() { 
    		Properties reloadProperties = new Properties();
    		List<String> locs = IdUtil.splitStrings(LOCATIONS);
    		for (String location : locs) { 
    			try { 
    				reloadProperties = PropertiesLoaderUtils.loadProperties(new PathMatchingResourcePatternResolver().getResource(location + "application.properties"));
    
    			} catch (Exception e) { 
    				String s = "Load resource file failed - ";
    				logger.error(s);
    			}
    			if (reloadProperties != null && reloadProperties.size()>0) { 
    				properties = reloadProperties;
    				String s = "Load resource file success - application.properties";
    				logger.info(s);
    				break;
    			}
    		}
    
    	}
    
    	public static String getResource(String key) { 
    		String message = properties.getProperty(key, DEFAULT_MESSAGE);
    		try { 
    			message = new String(message.getBytes(), "UTF-8");
    		} catch (UnsupportedEncodingException e) { 
    			e.printStackTrace();
    			return DEFAULT_MESSAGE;
    		}
    		return message;
    	}
    
    	public static String getResource(String key, String defaultValue) { 
    		String message = properties.getProperty(key, defaultValue);
    		try { 
    			message = new String(message.getBytes(), "UTF-8");
    		} catch (UnsupportedEncodingException e) { 
    			e.printStackTrace();
    			return defaultValue;
    		}
    		return message;
    	}
    
    }

## 在线刷新配置文件： ##

写一个controller调用下 上面工具类的reloadProperties()方法即可

@RequestMapping("/reloadConfig")
        @ResponseBody
        public String reloadConfig(){ 
            try { 
                ConfigMgr.reloadProperties();
            } catch (Exception e1) { 
                logger.error("配置文件加载出错", e1);
                return "ReloadConfig failed -"+e1;
            }
            return "ReloadConfig Success ";
        }

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZhbmdjaGFvMjAxMQ_size_16_color_FFFFFF_t_70]: /images/20220213/1a320bbb892a4750ad708f4ce773f16e.png