小伙伴啊，小伙伴，你真是懒得动手！
代码如下：
import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.text.SimpleDateFormat; import java.util.Date; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.Properties; import java.util.concurrent.Executors; import java.util.concurrent.ScheduledExecutorService; import java.util.concurrent.TimeUnit; import com.intector.fcy.csources.exception.EType; import com.intector.fcy.csources.exception.IntecException; /** * @ClassName: PropUtils * @Description: TODO(属性文件工具类) * @author intector_FHQ * @date 2017年3月10日 下午1:39:24 * */ public class PropUtils { private final ScheduledExecutorService service = Executors.newSingleThreadScheduledExecutor(); /** * 文件前缀 */ private String prefixNmae = "props"; protected boolean isScanning; private Long scanningS; private Long initialDelay = 10L; protected int fileCount; protected String txpath; protected Map<String, PropMegs> props; public Long getInitialDelay() { return initialDelay; } public void setInitialDelay(Long initialDelay) { this.initialDelay = initialDelay; } public Long getScanningS() { return scanningS; } public void setScanningS(Long scanningS) { this.scanningS = scanningS; } public String getPrefixNmae() { return prefixNmae; } public void setPrefixNmae(String prefixNmae) { this.prefixNmae = prefixNmae; } /** * @Title: getPropValueByKey @Description: TODO(获取属性文件中属性的值) @param @param * propName @param @param key @param @return 设定文件 @return String * 返回类型 @throws */ public String getPropValueByKey(String propName, String key) { if(this.props==null||this.props.size()==0){ return null; } if(this.props.get(propName)==null){ return null; } return this.props.get(propName).getProperties().getProperty(key); } /** * <p> * 构造器: * </p> * <p> * 扫描指定地方的文件，并加载: * </p> * * @throws Exception */ public PropUtils(boolean isScanning) { // TODO Auto-generated constructor stub try { this.txpath = java.net.URLDecoder .decode(ClassLoader.getSystemClassLoader().getResource(this.prefixNmae).getPath(), "utf-8"); this.isScanning = isScanning; this.getProps(); this.fileCount = this.props.size(); if (isScanning) { this.scanningS = 5L; this.scanningProps(this); } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } public PropUtils() { try { this.txpath = java.net.URLDecoder .decode(ClassLoader.getSystemClassLoader().getResource(this.prefixNmae).getPath(), "utf-8"); this.txpath = java.net.URLDecoder.decode(this.txpath, "utf-8"); this.getProps(); this.fileCount = this.props.size(); this.isScanning = false; } catch (Exception e) { // TODO: handle exception e.printStackTrace(); } } public PropUtils(boolean isScanning, Long scanningS) { try { this.txpath = java.net.URLDecoder .decode(ClassLoader.getSystemClassLoader().getResource(this.prefixNmae).getPath(), "utf-8"); this.isScanning = isScanning; this.getProps(); this.fileCount = this.props.size(); if (isScanning) { // 开始扫描 this.scanningS = scanningS; this.scanningProps(this); } } catch (Exception e) { // TODO: handle exception e.printStackTrace(); } } /** * <p> * 构造器: * </p> * <p> * Description: * </p> * * @param isScanning * @param scanningS * @param initialDelay * @throws Exception */ public PropUtils(boolean isScanning, Long initialDelay, Long scanningS) { try { this.txpath = java.net.URLDecoder .decode(ClassLoader.getSystemClassLoader().getResource(this.prefixNmae).getPath(), "utf-8"); this.getProps(); this.fileCount = this.props.size(); this.isScanning = isScanning; this.initialDelay = initialDelay; if (isScanning) { // 开始扫描 this.scanningS = scanningS; this.scanningProps(this); } } catch (Exception e) { // TODO: handle exception e.printStackTrace(); } } /** * @throws Exception * @Title: getPropMegs @Description: TODO(读取属性文件) @param @return * 设定文件 @return List<propMegs> 返回类型 @throws */ private void getProps() throws Exception { this.props = new HashMap<String, PropMegs>(); File file = new File(this.txpath); if (file.exists()) { this.Analyticaldata(file); } else { throw new IntecException("文件目录不存在！", EType.SYS); } } private void Analyticaldata(File file) throws IOException { // TODO Auto-generated method stub File[] files = file.listFiles(); for (File f : files) { if (f.isFile()) { if ("properties" .equals(f.getName().substring(f.getName().lastIndexOf(".") + 1, f.getName().length()))) { Properties prop = new Properties(); InputStream in = new FileInputStream(f); prop.load(in); PropMegs megs = new PropMegs(f.getName(),f.lastModified() + "", prop); megs.setFilePath(f.getPath()); this.props.put(f.getName().substring(0, f.getName().lastIndexOf(".")), megs); in.close(); } } else { this.Analyticaldata(f); } } } /** * @param propUtils * @Title: scanningProps @Description: TODO(定时扫描) @param @throws * Exception 设定文件 @return void 返回类型 @throws */ public void scanningProps(final PropUtils propUtils) throws Exception { // 第二个参数为首次执行的延时时间，第三个参数为定时执行的间隔时间 service.scheduleAtFixedRate(new Runnable() { public void run() { // task to run goes here System.out.println("Intector>Proputils start scanning path[" + propUtils.txpath + "] time " + new SimpleDateFormat("yyyy-MM-DD HH:mm:ss").format(new Date())); try { propUtils.scanningDatas(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); System.out.println("Intector scanning stop because this catch " + e.getMessage() + " time is " + new SimpleDateFormat("yyyy-MM-DD HH:mm:ss").format(new Date())); service.shutdown(); } } }, this.initialDelay, this.scanningS, TimeUnit.MINUTES); } /** * 监听文件 @Title: scanningDatas @Description: * TODO(这里用一句话描述这个方法的作用) @param @throws Exception 设定文件 @return void * 返回类型 @throws */ private void scanningDatas() throws Exception { File file = new File(this.txpath); if (file.exists()) { if (file.listFiles().length == 0) { throw new IntecException("文件目录下不存在任何文件！", EType.SYS); } else { this.Analyticaldatas(file); Iterator<String> iterator = this.props.keySet().iterator(); while (iterator.hasNext()) { String key = (String) iterator.next(); PropMegs pm = this.props.get(key); File fi = new File(pm.getFilePath()); if (!fi.exists()) { iterator.remove(); // 添加该行代码 this.props.remove(key); } } this.fileCount = this.props.size(); } } else { throw new IntecException("文件目录不存在！", EType.SYS); } } private void Analyticaldatas(File file) throws Exception, IOException { // TODO Auto-generated method stub File[] files = file.listFiles(); for (File f : files) { if (f.isFile()) { if ("properties" .equals(f.getName().substring(f.getName().lastIndexOf(".") + 1, f.getName().length()))) { PropMegs pm = this.props.get(f.getName()); if (pm == null || !pm.getFileTime().equals(f.lastModified() + "")) { Properties prop = new Properties(); InputStream in = new FileInputStream(f); prop.load(in); PropMegs megs = new PropMegs(f.getName(),f.lastModified() + "", prop); megs.setFilePath(f.getPath()); this.props.put(f.getName().substring(0, f.getName().lastIndexOf(".")), megs); in.close(); } } } else { this.Analyticaldatas(f); } } } /** * * @Title: destory @Description: TODO(销毁时触发) @param 设定文件 @return void * 返回类型 @throws */ protected void destory() { service.shutdown(); this.props=null; this.fileCount=0; this.isScanning=false; this.scanningS=0L; this.initialDelay=0l; this.txpath=null; } /** * @ClassName: propMegs * @Description: TODO(文件描述对象--内部对象) * @author intector_FHQ * @date 2017年3月10日 下午5:43:41 */ public class PropMegs { private String fileName; private String fileTime; private String filePath; private Properties properties; public String getFilePath() { return filePath; } public void setFilePath(String filePath) { this.filePath = filePath; } public Properties getProperties() { return properties; } public void setProperties(Properties properties) { this.properties = properties; } public String getFileName() { return fileName; } public void setFileName(String fileName) { this.fileName = fileName; } public String getFileTime() { return fileTime; } public void setFileTime(String fileTime) { this.fileTime = fileTime; } public PropMegs() { super(); // TODO Auto-generated constructor stub } public PropMegs(String fileName, String fileTime, Properties properties) { super(); this.fileName = fileName; this.fileTime = fileTime; this.properties = properties; } } }测试代码如下： public class TProputils { public static void main(String[] args) { final PropUtils propUtils=new PropUtils(true); System.out.println(propUtils.toString()); ScheduledExecutorService service = Executors.newSingleThreadScheduledExecutor(); service.scheduleAtFixedRate(new Runnable() { public void run() { // task to run goes here System.out.println(propUtils.getPropValueByKey("server", "dirver")); } }, 20, 1, TimeUnit.SECONDS); } } spring 配置如下： <!-- 引入属性配置文件 自定义属相文件加载类 3中构造方法 isScanning：是否开启自动扫描 默认false scanningS: 扫描周期 默认5 单位分钟 initialDelay：延迟扫描时间 默认10 单位秒 --> <bean id="propsBean" class="com.intector.fcy.csources.comutils.props.PropUtils" scope="singleton" destroy-method="destory"/> <!-- <bean id="propsBean" class="com.intector.fcy.csources.comutils.props.PropUtils"> <constructor-arg name="isScanning" value="true" /> </bean> <bean id="propsBean" class="com.intector.fcy.csources.comutils.props.PropUtils"> <constructor-arg name="isScanning" value="true" /> <constructor-arg name="scanningS" value="5" /> </bean> <bean id="propsBean" class="com.intector.fcy.csources.comutils.props.PropUtils"> <constructor-arg name="isScanning" value="true" /> <constructor-arg name="scanningS" value="5" /> <constructor-arg name="initialDelay" value="10" /> </bean> --> 工具类使用说明：
1.在项目根目录创建 props 文件夹 （名称可在工具类下修改）这里不支持构造注入；
2.工具类运行后自动加载 props 文件加下的所有 属性文件（包含嵌套目录下的所有属性文件），将属性文件的内容及文件信息保存到工具类的map集合中；
3.可配置是否定期自动扫描文件，若文件发生变化（修改，删除，新增），则及时更新工具类map内容；
该工具类可用于java web 项目中 频繁修改属性文件，就不用重启服务了。
web 中将
this.txpath = java.net.URLDecoder .decode(ClassLoader.getSystemClassLoader().getResource(this.prefixNmae).getPath(), "utf-8");改为 this.txpath = java.net.URLDecoder.decode(this.getClass().getClassLoader().getResource(this.prefixNmae).getPath(), "utf-8");
