import java.io.FileNotFoundException;import java.io.IOException;import java.io.InputStream;import java.util.Properties;/** * Created by zhangyue on 16/9/22. * 读取配置文件工具类 */public class PropertiesUtil {    private static String username;    private static String password;    private static String url;    private static String slaveUrl;    private static String driver;    public void init(){        InputStream is=null;        try {             is = this.getClass().getClassLoader().getResourceAsStream("app.properties");            System.out.println("is:"+is);            Properties properties = new Properties();            properties.load(is);            //中文可能会出现乱码，需要转换一下            username = new String(properties.getProperty("username").getBytes("ISO-8859-1"), "UTF-8");            password = properties.getProperty("password");            driver = properties.getProperty("driver");            url = properties.getProperty("url");            slaveUrl = properties.getProperty("slaveUrl");        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }finally {            if(is!=null){                try {                    is.close();                } catch (IOException e) {                    e.printStackTrace();                }            }        }    }    @Override    public String toString() {        return "PropertiesUtil{} \n"+PropertiesUtil.username+",\n"+PropertiesUtil.password                +",\n"+PropertiesUtil.url+",\n"+PropertiesUtil.slaveUrl                +",\n"+PropertiesUtil.driver;    }    public static String getValueByProperiesKey(String key){        InputStream is=null;        try {            is = PropertiesUtil.class.getClassLoader().getResourceAsStream("app.properties");            System.out.println("is:"+is);            Properties properties = new Properties();            properties.load(is);            password = properties.getProperty(key);            return password;        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }finally {            if(is!=null){                try {                    is.close();                } catch (IOException e) {                    e.printStackTrace();                }            }        }        return "";    }    public static void main(String[] args) {        PropertiesUtil p = new PropertiesUtil();        p.init();        System.out.println(p.toString());        System.out.println(PropertiesUtil.getValueByProperiesKey("maxActive"));    }}