资源文件解析类PropertiesUtil

淡淡的烟草味﹌ 2022-05-10 01:40 143阅读 0赞

package cn.edu.hbcit.util;
    /** 
     * <p>Description: Properties文件操作</p> 
     * 
     * <p>Copyright: Copyright (c) 2009</p> 
     * 
     */  
    import java.io.BufferedInputStream;  
    import java.io.FileInputStream;  
    import java.io.FileOutputStream;  
    import java.io.IOException;  
    import java.io.InputStream;  
    import java.io.OutputStream;  
    import java.util.Enumeration;  
    import java.util.Properties;  
     
    public class OperateProperties {
    	
    public OperateProperties(){
    		
    	}
     
    	//根据key读取value
    	 public static String readValue(String filePath,String key) {
    	  Properties props = new Properties();
    	        try {
    	         //InputStream in = new BufferedInputStream (new FileInputStream(filePath));
    	        	InputStream in = OperateProperties.class.getResourceAsStream(filePath);
    	        	props.load(in);
    	        	String value = props.getProperty (key);
    	            System.out.println("key:"+key+"   "+"value:"+value);
    	            return value;
    	        } catch (Exception e) {
    	         e.printStackTrace();
    	         return null;
    	        }
    	 }
    	 
    	//读取properties的全部信息
    	    public static void readProperties(String filePath) {
    	     Properties props = new Properties();
    	        try {
    	         InputStream in = new BufferedInputStream (new FileInputStream(filePath));
    	         props.load(in);
    	            Enumeration en = props.propertyNames();
    	             while (en.hasMoreElements()) {
    	              String key = (String) en.nextElement();
    	                    String Property = props.getProperty (key);
    	                    System.out.println(key+Property);
    	                }
    	        } catch (Exception e) {
    	         e.printStackTrace();
    	        }
    	    }
    	    
    	  //写入properties信息
    	    public static void writeProperties(String filePath,String parameterName,String parameterValue) {
    	     Properties prop = new Properties();
    	     try {
    	      InputStream fis = new FileInputStream(filePath);
    	            //从输入流中读取属性列表（键和元素对）
    	            prop.load(fis);
    	            //调用 Hashtable 的方法 put。使用 getProperty 方法提供并行性。
    	            //强制要求为属性的键和值使用字符串。返回值是 Hashtable 调用 put 的结果。
    	            OutputStream fos = new FileOutputStream(filePath);
    	            prop.setProperty(parameterName, parameterValue);
    	            //以适合使用 load 方法加载到 Properties 表中的格式，
    	            //将此 Properties 表中的属性列表（键和元素对）写入输出流
    	            prop.store(fos, "Update '" + parameterName + "' value");
    	        } catch (IOException e) {
    	         System.err.println("Visit "+filePath+" for updating "+parameterName+" value error");
    	        }
    	    }