properties文件操作类

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首先定义一个properties文件：test.properties

路径为D:/dev_env/workspace/test/WebRoot/WEB-INF/classes/test.properties

url=url0username=username0password=password0

定义操作类OperationPropertiesFile.java：

/** *  */package com.adam.dev.test.properties;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.InputStream;import java.io.OutputStream;import java.util.Enumeration;import java.util.Properties;/** * @author adam.胡升阳 * 创建日期 2011-11-4 */public class OperationPropertiesFile {//读取properties文件信息 public static void readPropertiesFile(String filePath){try {InputStream is = new BufferedInputStream(new FileInputStream(filePath));Properties pros = new Properties();pros.load(is);Enumeration enum = pros.propertyNames();while(enum.hasMoreElements()){String key = (String) enum.nextElement();String value = pros.get(key).toString();System.out.println(key+"="+value);}} catch (Exception e) {e.printStackTrace();}}//写入properties文件public static void writePropertiesFile(String filePath,String key,String value){Properties pros = new Properties();try {OutputStream os = new BufferedOutputStream(new FileOutputStream(filePath));pros.setProperty(key, value);pros.store(os, "properties_"+key);} catch (Exception e) {e.printStackTrace();}}public static void main(String[] args){String filePath = "D:/dev_env/workspace/test/WebRoot/WEB-INF/classes/test.properties";OperationPropertiesFile.readPropertiesFile(filePath);System.out.println("----------------分割线-------------------");OperationPropertiesFile.writePropertiesFile(filePath, "driver", "oracle.jdbc.driver.OracleDriver");OperationPropertiesFile.readPropertiesFile(filePath);}}

控制台输出结果：

url=url0password=password0username=username0----------------分割线-------------------driver=oracle.jdbc.driver.OracleDriver

再看test.properties文件内容：

#properties_driver#Fri Nov 04 17:51:45 CST 2011driver=oracle.jdbc.driver.OracleDriver

文件中只有新写入的driver了。