JAVA_WEB工具类---属性工具类

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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 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);
	}

	/**
	 * 

	 * 构造器:
	 * 
	 * 

	 * 扫描指定地方的文件，并加载:
	 * 
	 * 
	 * @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();
		}
	}

	/**
	 * 

	 * 构造器:
	 * 
	 * 

	 * Description:
	 * 
	 * 
	 * @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 返回类型 @throws
	 */
	private void getProps() throws Exception {
		this.props = new HashMap();
		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 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：

 

 

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");