Java代码 ：
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
public class SystemConfigUtil {
private static SystemConfigUtil systemConfigUtil = null;
private static Map proMap = new HashMap();
private SystemConfigUtil() {
File file = new File("src\\system-config.properties");
InputStream is = null;
Properties pro = new Properties();
try {
is = new FileInputStream(file);
pro.load(is);
Enumeration e = pro.propertyNames();
while (e.hasMoreElements()) {
String key = (String) e.nextElement();
String value = (String) pro.get(key);
proMap.put(key, value);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();//千万别忘了关闭资源哦！
} catch (IOException e) {
e.printStackTrace();
}
}
}
public static SystemConfigUtil getInstance() {
if (systemConfigUtil == null) {
systemConfigUtil = new SystemConfigUtil();
}
return null;
}
public static Map getProMap() {
return proMap;
}
public static void main(String[] args) {
//写一个main方法，来验证一下
SystemConfigUtil d1 = SystemConfigUtil.getInstance();
SystemConfigUtil d2 = SystemConfigUtil.getInstance();
System.out.println(d1 == d2);
Map m1 = d1.getProMap();
Map m2 = d2.getProMap();
System.out.println(m1 == m2);
System.out.println(m1.get("ip"));
}
}
由于是在一个工程中使用的，所以配置文件直接写死在了程序里。稍加改动就可以变成动态的。经过测试这样读取一个配置文件（5K）只需要2毫秒（我的机器配置中等偏上）。