简单的辅助程序

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这篇博客记录平时一些可以重复使用的辅助程序。多了以后或许可以做成一个库。

PropertiesReader

使用

文件

D:\workspace\RyanTool\doc\test.properties

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age=30
gender=male

显示所有内容

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String filePath = "D:\\workspace\\RyanTool\\doc\\test.properties";
PropertiesReader propertiesReader = new PropertiesReader();
propertiesReader.printAll(filePath);

根据特定的key获取value:

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String filePath = "D:\\workspace\\RyanTool\\doc\\test.properties";
PropertiesReader propertiesReader = new PropertiesReader();
System.out.println(propertiesReader.getByKey("age", filePath));

PropertiesReader.java

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package ryanluoxu.tool;

import java.io.File;
import java.io.FileInputStream;
import java.util.Enumeration;
import java.util.Properties;

public class PropertiesReader {
	
	/**
	 * Key must be unique.
	 * @param key
	 * @param filePath
	 * @return value
	 */
	public String getByKey(String key, String filePath) {
		String value = null;
		Properties properties = new Properties();
		try {
			File file = new File(filePath);
			FileInputStream fileInput = new FileInputStream(file);
			properties.load(fileInput);
			fileInput.close();
		} catch (Exception e) {
			System.err.println(">>> Error when loading properties file..");
		}
		Enumeration<Object> enuKeys = properties.keys();
		while (enuKeys.hasMoreElements()) {
			String k = (String) enuKeys.nextElement();
			if (k.equals(key)) {
				value = properties.getProperty(k);
				break;
			}
		}
		return value;
	}
	
	/**
	 * print all values
	 * @param filePath
	 */
	public void printAll(String filePath) {
		Properties properties = new Properties();
		try {
			File file = new File(filePath);
			FileInputStream fileInput = new FileInputStream(file);
			properties.load(fileInput);
			fileInput.close();
		} catch (Exception e) {
			System.err.println(">>> Error when loading properties file..");
		}
		Enumeration<Object> enuKeys = properties.keys();
		while (enuKeys.hasMoreElements()) {
			String k = (String) enuKeys.nextElement();
			String value = properties.getProperty(k);
			System.out.println(k + ": " + value);
		}
	}
}