如何使用Java读写系统属性？
读：
Properties props = System.getProperties(); Enumeration prop_names = props.propertyNames(); while (prop_names.hasMoreElements()) { String prop_name = (String) prop_names.nextElement(); String property = props.getProperty(prop_name); System.out.println(“Property ‘” + prop_name + “‘ is ‘”+ property + “‘”); } |
写：
System.setProperties(props);
简述properties文件的结构和基本用法
结构：扩展名为properties的文件，内容为key、value的映射，例如”a=2″
用法：
public static void main(String args[]) { try { String name = “test.properties”; InputStream in = new BufferedInputStream(new FileInputStream(name)); Properties p = new Properties(); p.load(in); System.out.println(“a的值==” + p.getProperty(“a”)); } catch (Exception err) { err.printStackTrace(); } } } |
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