java操作properties配置文件

1.1.1. Properties类图

1.1.2. 读取Properties配置文件比较常用的方式

1。使用java.lang.Class类的getResourceAsStream(String name)方法
InputStream in = getClass().getResourceAsStream("文件名称");

2.使用流的方式操作

InputStream in = new BufferedInputStream(new FileInputStream(filepath));

1.1.3. 缺点

1.格式必须是k=v 不能有空格。

2.不能定时刷新变化的值(比如线上环境修改值程序读取到的还是旧值)。需要自己写程序控制。

3.值都是string类型需要自己获取的时候根据需求转换。

基于上面的缺点我们可以使用org.apache.commons.configuration类解决下面是日常开发中读取properties封装。

1.1.4. commons-configuration框架的使用

1.1.4.1. maven包导入

         commons-configuration        commons-configuration        1.8

1.1.4.2. 工具类封装

package cn.xhgg.common.configuration; import java.util.HashMap;import java.util.Iterator;import java.util.List;import java.util.Map;import java.util.concurrent.ConcurrentHashMap; import org.apache.commons.configuration.ConfigurationException;import org.apache.commons.configuration.PropertiesConfiguration;import org.apache.commons.configuration.reloading.FileChangedReloadingStrategy;import org.apache.commons.lang.StringUtils;import org.slf4j.Logger;import org.slf4j.LoggerFactory; public class PropertiesConfigUtil {private static Logger log = LoggerFactory.getLogger(PropertiesConfigUtil.class); public static final String PROPS_SUFFIX = ".properties";private static Map configMap = new ConcurrentHashMap();private static PropertiesConfiguration getConfig(String configName) {//去除空格configName = configName.trim();//有后缀使用后缀 没后缀 添加后缀String configSig = StringUtils.endsWith(configName, PROPS_SUFFIX) ? configName : configName+PROPS_SUFFIX;if (configMap.containsKey(configSig)) {return configMap.get(configSig);}PropertiesConfiguration config = null;try {config=new PropertiesConfiguration();config.setEncoding("UTF-8");config.load(configSig);//默认五秒检查一次config.setReloadingStrategy(new FileChangedReloadingStrategy());config.setThrowExceptionOnMissing(true);configMap.put(configSig, config);} catch (ConfigurationException e) {e.printStackTrace();}return config;}public static Map getKeyValuePairs(String configSig) {PropertiesConfiguration config = getConfig(configSig);if (config == null) {return null;}Iterator iters = config.getKeys();Map retMap = new HashMap();while (iters.hasNext()) {String beforeKey = iters.next();if (retMap.containsKey(beforeKey)) {log.warn(configSig + " configKey:" + beforeKey + " repeated!!");}retMap.put(beforeKey, config.getString(beforeKey));}return retMap;}static public String getString(String configSig, String key) {return getConfig(configSig).getString(key);} static public String getString(String configSig, String key, String defaultValue) {return getConfig(configSig).getString(key, defaultValue);} static public int getInt(String configSig, String key) {return getConfig(configSig).getInt(key);} static public int getInt(String configSig, String key, int defaultValue) {return getConfig(configSig).getInt(key, defaultValue);} static public boolean getBoolean(String configSig, String key) {return getConfig(configSig).getBoolean(key);} static public boolean getBoolean(String configSig, String key, boolean defaultValue) {return getConfig(configSig).getBoolean(key, defaultValue);} static public double getDouble(String configSig, String key) {return getConfig(configSig).getDouble(key);} static public double getDouble(String configSig, String key, double defaultValue) {return getConfig(configSig).getDouble(key, defaultValue);} static public float getFloat(String configSig, String key) {return getConfig(configSig).getFloat(key);} static public float getFloat(String configSig, String key, float defaultValue) {return getConfig(configSig).getFloat(key, defaultValue);} static public long getLong(String configSig, String key) {return getConfig(configSig).getLong(key);} static public long getLong(String configSig, String key, long defaultValue) {return getConfig(configSig).getLong(key, defaultValue);} static public short getShort(String configSig, String key) {return getConfig(configSig).getShort(key);} static public short getShort(String configSig, String key, short defaultValue) {return getConfig(configSig).getShort(key, defaultValue);} static public List