ResourceBundle与Properties读取配置文件

　

resourcebundle

ResourceBundle与Properties的区别在于ResourceBundle通常是用于国际化的属性配置文件读取，Properties则是一般的属性配置文件读取。

ResourceBundle的单例使用如下

import java.util.ResourceBundle;

/**
 * 访问配置文件 - 单例
 * @author: cyq    
 * @since : 2015-09-30 10:17
 */

public class configuration {
	
	private static ResourceBundle rb    			= null;
	private volatile static Configuration instance	= null;
	
	private Configuration(String configFile) {
		rb = ResourceBundle.getBundle(configFile);
	}
	
	public static Configuration getInstance(String configFile) {
		if(instance == null) {
			synchronized(Configuration.class) {
				if(instance == null) {
					instance = new Configuration(configFile);
				}
			}
		}
		return instance;
	}
	
	public String getValue(String key) {
		return (rb.getString(key));
	}
}

Properties的使用

import java.io.File;
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 PropertiesMain {
	/**
	 * 根据Key读取Value
	 *
	 * @param filePath
	 * @param key
	 * @return
	 */
	public static String getValueByKey(String filePath, String key) {
		Properties pps = new Properties();
		InputStream in = null;
		try {
			// in = new BufferedInputStream(new FileInputStream(filePath));
			in = PropertiesMain.class.getResourceAsStream(filePath);
			pps.load(in);
			String value = pps.getProperty(key);
			System.out.println(key + " = " + value);
			return value;
		} catch (IOException e) {
			e.printstacktrace();
			return null;
		}
	}

	/**
	 * 读取Properties的全部信息
	 *
	 * @param filePath
	 * @throws IOException
	 */
	public static void getAllProperties(String filePath) throws IOException {
		Properties pps = new Properties();
		InputStream in = PropertiesMain.class.getResourceAsStream(filePath);
		pps.load(in);
		Enumeration en = pps.propertyNames(); // 得到配置文件的名字

		while (en.hasMoreElements()) {
			String strKey = (String) en.nextElement();
			String strValue = pps.getProperty(strKey);
			System.out.println(strKey + "=" + strValue);
		}
	}

	/**
	 * 写入Properties信息
	 *
	 * @param filePath
	 * @param pKey
	 * @param pValue
	 * @throws IOException
	 */
	public static void writeProperties(String filePath, String pKey,
			String pValue) throws IOException {
		Properties pps = new Properties();

		InputStream in = new FileInputStream(filePath);
		// 从输入流中读取属性列表（键和元素对）
		pps.load(in);
		OutputStream out = new FileOutputStream(filePath);
		Object setProperty = pps.setProperty(pKey, pValue);
		System.out.println(setProperty);
		// 将此 Properties 表中的属性列表（键和元素对）写入输出流
		pps.store(out, "Update " + pKey + " name");
	}

	public static void main(String[] args) throws IOException {
		// 打印当前目录
		// System.out.println(new File(".").getabsolutePath());
		// 如果使用FileInputStream方式读取文件流 ./config/myconfig.properties
		// 如果使用getResourceAsStream方式读取文件流 /myconfig.properties
		// String value = getValueByKey("/myconfig.properties", "say.hello");
		// System.out.println(value);
		// getAllProperties("/myconfig.properties");
		// writeProperties("./config/myconfig.properties","long", "2112");
	}

}

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