Properties 类读取配置文件1、使用java.util.Properties类的load()方法 示例： Java代码 InputStream in
Properties 类读取配置文件
1、使用java.util.Properties类的load()方法 示例：
Java代码
InputStream in = lnew BufferedInputStream(new FileInputStream(name));
Properties p = new Properties();
p.load(in);
2、使用java.util.ResourceBundle类的getBundle()方法
示例：
Java代码
ResourceBundle rb = ResourceBundle.getBundle(name, Locale.getDefault());
用ResourceBundle读取.properties文件可避免路径问题
我在jar里读取.properties文件时，总是找不到文件路径，后来用ResourceBundle读取.properties文件即可避免路径问题，代码如下：
//process为文件名，切记不要加 .properties， URL是文件里的键名
Java代码
ResourceBundle bundle = ResourceBundle.getBundle("com.ihandy.smsoc.app.process");
String s = bundle.getString("URL");
System.out.println(s);
pURL = s;
3、使用java.util.PropertyResourceBundle类的构造函数
示例：
Java代码
InputStream in = new BufferedInputStream(new FileInputStream(name));
ResourceBundle rb = new PropertyResourceBundle(in);
4、使用class变量的getResourceAsStream()方法
示例：
Java代码
InputStream in = 类名.class.getResourceAsStream(name);
Properties p = new Properties();
p.load(in);
5、使用class.getClassLoader()所得到的java.lang.ClassLoader的getResourceAsStream()方法 示例：
Java代码
InputStream in = 类名.class.getClassLoader().getResourceAsStream(name);
Properties p = new Properties();
p.load(in);
6、使用java.lang.ClassLoader类的getSystemResourceAsStream()静态方法 示例：
Java代码
InputStream in = ClassLoader.getSystemResourceAsStream(name);
Properties p = new Properties();
p.load(in);
7、Servlet中可以使用javax.servlet.ServletContext的getResourceAsStream()方法 示例：
Java代码
InputStream in = context.getResourceAsStream(path);
Properties p = new Properties();
p.load(in);
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import?java.io.IOException; ??import?java.io.InputStream; ??import?java.util.Enumeration; ??import?java.util.Properties; ??????/** ??*??Properties? ??*??配置文件要有中文就使用xml文件加载 ??*?@author?whp ??* ??*/??public?class?PropertiesConfig?extends?Properties?{ ??????/** ??????*? ??????*/??????private?static?final?long?serialVersionUID?=?1L; ?????? ??????protected?static?final?Properties?p=new?Properties(); ??????public?PropertiesConfig(String?file)?{ ??????????InputStream?in=PropertiesConfig.class.getResourceAsStream(file); ??????????if(in!=null){ ??????????????try?{ ??????????????????p.load(in); ??????????????????in.close(); ??????????????}?catch?(IOException?e)?{ ??????????????????System.out.println("加载配置文件错误"); ??????????????????e.printStackTrace(); ??????????????} ?????????????? ??????????} ??????} ??????@Override??????public??String?getProperty(String?key,?String?defaultValue)?{ ??????????return?p.getProperty(key,?defaultValue); ??????} ??????@Override??????public?String?getProperty(String?key)?{ ??????????return?p.getProperty(key); ??????} ?????? ??????/** ??????*??属性列表 ??????*/??????private?void?propertiesList(){ ??????????Enumeration?e=p.keys(); ??????????while(e.hasMoreElements()){ ??????????????String?key=(String)e.nextElement(); ??????????????System.out.println(key+"="+p.getProperty(key)); ??????????} ??????} ?????? ??????public?static?void?main(String[]?args)?{ ??????????PropertiesConfig?pro=new?PropertiesConfig("config.properties"); ??????????//String?s=pro.getProperty("name"); ??????????pro.propertiesList(); ??????????//System.out.println(s); ??????} ?????? ?????? ????}??
