package com.luang.util.properties;  import java.io.File;  import java.io.FileInputStream;    import java.io.FileOutputStream;    import java.io.IOException;    import java.io.InputStream;  import java.io.OutputStream;    import java.net.URI;  import java.util.Enumeration;    import java.util.HashMap;    import java.util.Map;    import java.util.Properties;    import java.util.ResourceBundle;      /**   *    * PropertiesUtil.java   *   * @desc properties 资源文件解析工具   * @author Guoxp   * @datatime Apr 7, 2013 3:58:45 PM   *   */  public class PropertiesUtil {            private Properties props;        private URI uri;            public PropertiesUtil(String fileName){            readProperties(fileName);        }        private void readProperties(String fileName) {            try {                props = new Properties();                InputStream fis =getClass().getResourceAsStream(fileName);                props.load(fis);                uri = this.getClass().getResource("/dbConfig.properties").toURI();          } catch (Exception e) {                e.printStackTrace();            }        }        /**        * 获取某个属性        */        public String getProperty(String key){            return props.getProperty(key);        }        /**        * 获取所有属性，返回一个map,不常用        * 可以试试props.putAll(t)        */        public Map getAllProperty(){            Map map=new HashMap();            Enumeration enu = props.propertyNames();            while (enu.hasMoreElements()) {                String key = (String) enu.nextElement();                String value = props.getProperty(key);                map.put(key, value);            }            return map;        }        /**        * 在控制台上打印出所有属性，调试时用。        */        public void printProperties(){            props.list(System.out);        }        /**        * 写入properties信息        */        public void writeProperties(String key, String value) {            try {            OutputStream fos = new FileOutputStream(new File(uri));                props.setProperty(key, value);                // 将此 Properties 表中的属性列表（键和元素对）写入输出流                props.store(fos, "『comments』Update key：" + key);            } catch (Exception e) {            e.printStackTrace();          }        }           public static void main(String[] args) {            PropertiesUtil util=new PropertiesUtil("src/dbConfig.properties");            util.writeProperties("dbtype", "MSSQL");        }        }