java 读取系统Properties代码实例

import java.util.*; public class PropertiesTest {   public static void main(String[] args) {     Properties properties = System.getProperties();    PropertiesTest pt = new PropertiesTest();    Map<String,String> map = pt.getSpecialMap(properties);    //便于方便读取，配置较多的属性打印出来    pt.showMap(map);  }    Map<String,String> getSpecialMap(Properties properties){     Set<Map.Entry<Object,Object>> props = properties.entrySet();    Map<String,String> map = new HashMap<String, String>();    Iterator<Map.Entry<Object, Object>> it = props.iterator();    while (it.hasNext()) {      Map.Entry<Object,Object> entry = it.next();      System.out.println("key= " + entry.getKey() );      System.out.println("value= " + entry.getValue());      if("java.library.path".equalsIgnoreCase("" + entry.getKey())) {        map.put(entry.getKey()+"",entry.getValue()+"");      }      if("java.class.path".equalsIgnoreCase("" + entry.getKey())) {        map.put(entry.getKey()+"",entry.getValue()+"");      }      if ("sun.boot.class.path".equalsIgnoreCase("" + entry.getKey())) {        map.put(entry.getKey()+"",entry.getValue()+"");      }      if("java.ext.dirs".equalsIgnoreCase("" + entry.getKey())) {        map.put(entry.getKey()+"",entry.getValue()+"");      }    }    return map;  }    void showMap(Map<String,String> map) {    for (Map.Entry<String, String> entry : map.entrySet()) {      System.out.println("----------------------------------------------------");      System.out.println(entry.getKey() +":");      splitStr(entry.getValue());      System.out.println("----------------------------------------------------");    }  }   void splitStr(String string) {    String[] str = string.split(";");    for (int i = 0; i < str.length; i++) {      System.out.println(str[i]);    }  }}