java - properties read write

最新推荐文章于 2025-09-26 13:34:48 发布

原创最新推荐文章于 2025-09-26 13:34:48 发布 · 581 阅读

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本文详细介绍了Java中如何通过文件操作获取属性文件内容，使用正则表达式匹配特定属性，进行数值提取，并更新数据库数据。同时展示了如何将提取的数据写入新的属性文件，涉及属性文件读取、数据处理及文件写入的基本Java操作。

架构：

Get properties：

	public static Properties getProperties(String fileName) {
		String filePath = "src/resource/" + fileName + ".properties";
		File pFile = new File(filePath);
		FileInputStream pInStream = null;
		try {
            pInStream = new FileInputStream(pFile);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        Properties p = new Properties();
        try {
            p.load(pInStream); 
        } catch (IOException e) {
            e.printStackTrace();
        }
        // p.list(System.out);
        return p;
	}

取值：

	public static void transform(Connection conn, ResultSet rs, String propertyName, String rawField, 
			String newField) {
		int score = 0;
		Properties p = getProperties(propertyName);
		Enumeration<?> enu = p.propertyNames();
        while(enu.hasMoreElements()) {
        	String thisKey = (String)enu.nextElement();
            try {
				if (rawField.contains(thisKey)) {
					score = Integer.parseInt(p.getProperty(thisKey));
				}
			} catch (NumberFormatException e) {
				e.printStackTrace();
			} catch (Exception e) {
				e.printStackTrace();
			}
        }
        System.out.println(score);
        update(conn, rs, newField, score);
	}

写值：

	public static void updateProperties(String fileName, List<String> updateList) {  
	    String filePath = "src/crawl/" + fileName + ".properties";  
	    File pFile = new File(filePath);  
	    FileOutputStream pOutStream = null;  
	    try {  
	    	pOutStream = new FileOutputStream(pFile);  
	       } catch (FileNotFoundException e) {  
	           e.printStackTrace();  
	       }
	       Properties p = new Properties();  
	       try {
	    	   for (String updateValue:updateList) {
	    		   p.setProperty(updateValue,"");	//key, value
	    	   }
	    	   p.store(pOutStream, null);
	    	   pOutStream.close();
	       } catch (IOException e) {  
	           e.printStackTrace();  
	       }  
	}

参考：

http://blog.youkuaiyun.com/shixing_11/article/details/5652347