PropertiesConfiguration 是 Apache 帮我们实现按照文件的顺序读取properties文件的类，Properties类能做的它都能做。不仅如此，他还有许多方便实用的附加功能。

工具类:

import org.apache.commons.configuration.PropertiesConfiguration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;public class PropertiesUtil {private static final Logger logger = LoggerFactory.getLogger(PropertiesUtil.class);private static final String NATIVE_FILE_ADDRESS = "zta-monitor-api/src/main/resources/dev/statistics.properties";private static final String DEPLOY_FILE_ADDRESS = "export/App/conf/statistics.properties";public static void setValueToProperties(String key, String value) {try {PropertiesConfiguration propsConfig = new PropertiesConfiguration(DEPLOY_FILE_ADDRESS);propsConfig.setAutoSave(true);propsConfig.setProperty(key, value);} catch (Exception e) {logger.error("setValueToProperties error : {}", e.getMessage());}}public static void addValueToProperties(String key, String value) {try {PropertiesConfiguration propsConfig = new PropertiesConfiguration(DEPLOY_FILE_ADDRESS);// 修改属性之后自动保存，省去了propsConfig.save()过程propsConfig.setAutoSave(true);propsConfig.addProperty(key, value);} catch (Exception e) {logger.error("addValueToProperties error : {}", e.getMessage());}}public static String getValueFromProperties(String key) {String res = null;try {PropertiesConfiguration propsConfig = new PropertiesConfiguration(DEPLOY_FILE_ADDRESS);res = propsConfig.getString(key);} catch (Exception e) {logger.error("getValueFromProperties error : {}", e.getMessage());}return res;}public static void main(String[] args) {try {setValueToProperties("name2", "testError");addValueToProperties("name4", "test4");String name2 = getValueFromProperties("name4");System.out.println(name2);} catch (Exception e) {e.printStackTrace();}}
}

除此之外，还可以 propsConfig.setEncoding("utf-8") 设置编码。

需要的maven依赖：

<dependency>  <groupId>commons-configuration</groupId>  <artifactId>commons-configuration</artifactId>  <version>1.10</version>  
</dependency>