java 读取和写入properties文件-Java频道-中国IT实验室

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 ConfigInfo {

    // 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));     props.load(in);     String value = props.getProperty(key);     return value;    } catch (Exception e) {     e.printStackTrace();     System.err.println("ConfigInfoError" + e.toString());     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();     System.err.println("ConfigInfoError" + e.toString());    } }

    // 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) {     e.printStackTrace();    } }

    public static void main(String args[]) {    String filePath="/a.properties";    System.out.println(ConfigInfo.readValue(filePath, "error.winsock")); }

    }

    //a.properties

    error.splash.exit= Web Start splash screen process exiting .....\n error.winsock=tLast WinSock Error: error.winsock.load=Couldn't load winsock.dll error.winsock.start=WSAStartup failed error.badinst.nohome=Bad installation: JAVAWS_HOME not set error.splash.noimage=Splash: couldn't load splash screen image error.splash.socket=Splash: server socket failed error.splash.cmnd=Splash: unrecognized command error.splash.port=Splash: port not specified error.splash.send=Splash: send failed error.splash.timer=Splash: couldn't create shutdown timer error.splash.x11.open=Splash: Can't open X11 display error.splash.x11.connect=Splash: X11 connection failed

        }

【责编:landy】

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