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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);
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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 class Test {
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();
}
}
}