java读取properties

package com.avonaco.web.excel;  
  
import java.io.BufferedInputStream;  
import java.io.FileInputStream;  
import java.io.InputStream;  
import java.util.Enumeration;  
import java.util.HashMap;  
import java.util.Map;  
import java.util.Properties;  
import org.apache.commons.logging.Log;  
import org.apache.commons.logging.LogFactory;  
  
public class PropertiesUtil {  
      
    private static final Log log = LogFactory.getLog(PropertiesUtil.class);  
  
    private static Properties properties = new Properties() ;  
      
    public static final String US = "ApplicationResources.properties";          //英文  
  
    public static final String CHINA = "ApplicationResources_zh_CN.properties"; //中文  
      
    public static final String CHINA_USER = "ApplicationResourcesUserManager_zh_CN.properties" ;  
      
    public static final String US_USER = "ApplicationResourcesUserManager.properties";  
    /** 
     * @desc 取得全部的key和value 
     * @param propertiesName 
     * @return 
     * @author:  lic 
     * @datetime:2011-12-14 上午9:50:21 
     */  
    @SuppressWarnings({ "rawtypes", "unchecked" })  
    public static Map getProperties( String propertiesName){  
          
        Map map = new HashMap();   
          
        if ( propertiesName != null && !propertiesName.equals("") ){  
            String  url = PropertiesUtil.getPropertiesPath(propertiesName);  
            if( log.isDebugEnabled() ){  
                log.debug(">>>>>>>>>>>>>>>>>>>获取Properties文件路径-- " + url);  
            }  
              
            try {  
                InputStream in =new BufferedInputStream(new FileInputStream(url));  
                PropertiesUtil.properties.load(in);  
                  
                System.out.println("1");  
                  Enumeration en = PropertiesUtil.properties.propertyNames();  
                   while (en.hasMoreElements()) {  
                       String key = (String) en.nextElement();  
                       String value = PropertiesUtil.properties.getProperty(key);  
                     map.put(key, value);  
                    System.out.println();  
                    if( log.isDebugEnabled()){  
                        log.debug(">>>>>>>>>>>>>>>>>>>>>>>>>>  " + propertiesName + " -- : " + key  + " >>> value = " + value);  
                    }  
                   }  
            } catch (Exception e) {  
                log.debug(">>>>>>>> PropertiesUtil取得全部的key和value出错  :  " + e);  
                e.printStackTrace();  
            }  
        }  
          
          
        return map ;  
    }  
      
      
      
    /** 
     * @desc 根据key得到properties的value 
     * @param propertiesKey 
     * @return Map 
     * @author:  lic 
     * @datetime:2011-12-14 上午10:02:13 
     */  
    @SuppressWarnings("rawtypes")  
    public static String getPropertiesValue( String propertieskey , String filename){  
              
            String value = "" ;  
              
            if ( propertieskey != null && !propertieskey.equals("") ){  
                String pkey = filename;  
                String  url = PropertiesUtil.getPropertiesPath(filename);  
                try {  
                    InputStream in =new BufferedInputStream(new FileInputStream(url));  
//                  this.properties.load(in);  
                    PropertiesUtil.properties.load(in);  
                    System.out.println("1");  
//                    Enumeration en = properties.propertyNames();  
                      Enumeration en = PropertiesUtil.properties.propertyNames();  
                       while (en.hasMoreElements()) {  
                           String key = (String) en.nextElement();  
                           if ( key.equals(propertieskey) ){  
//                             value = this.properties.getProperty(key);  
                               value = PropertiesUtil.properties.getProperty(key);  
                           }  
                       }  
                } catch (Exception e) {  
                    e.printStackTrace();  
                }  
            }  
              
              
            return value ;  
        }  
          
      
  
    /** 
     * @desc 根据properties文件名获取路径 
     * @param propertiesKey 
     * @return Map 
     * @author:  lic 
     * @datetime:2011-12-13 下午15:53:58 
     */  
    public static String getPropertiesPath( String propertiesName ){  
              
            String path = "";  
            if ( propertiesName != null && !propertiesName.equals("") ){  
                path = PropertiesUtil.class.getClassLoader().getResource(propertiesName).toString().substring(6);  
            }  
              
            return path ;  
    }  
          
          
}  

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.Properties;

public class PropertiesControl {
 
 //根据key读取value
 public static String readValue(String filePath, String key) {
  Properties props = new Properties();
        try {
         InputStream in = new BufferedInputStream (new FileInputStream(filePath));
         props.load(in);
         String value = props.getProperty (key);
            //System.out.println(key+value);
            return value;
        } catch (Exception e) {
         e.printStackTrace();
         return null;
        }
 }
 
 //读取properties的全部信息
    public static void readProperties(String filePath) {
     Properties props = new Properties();
        try {
         InputStream in = new BufferedInputStream (new FileInputStream(filePath));
         props.load(in);
            Enumeration en = props.propertyNames();
             while (en.hasMoreElements()) {
              String key = (String) en.nextElement();
                    String Property = props.getProperty (key);
                    System.out.println(key+Property);
                }
        } catch (Exception e) {
         e.printStackTrace();
        }
    }

    //写入properties信息
    public static void writeProperties(String filePath,String parameterName,String parameterValue) {
     Properties prop = new Properties();
     try {
      InputStream fis = new FileInputStream(filePath);
            //从输入流中读取属性列表（键和元素对）
            prop.load(fis);
            //调用 Hashtable 的方法 put。使用 getProperty 方法提供并行性。
            //强制要求为属性的键和值使用字符串。返回值是 Hashtable 调用 put 的结果。
            OutputStream fos = new FileOutputStream(filePath);
            prop.setProperty(parameterName, parameterValue);
            //以适合使用 load 方法加载到 Properties 表中的格式，
            //将此 Properties 表中的属性列表（键和元素对）写入输出流
            prop.store(fos, "Update '" + parameterName + "' value");
        } catch (IOException e) {
         System.err.println("Visit "+filePath+" for updating "+parameterName+" value error");
        }
    }

    public static void main(String[] args) {
        readValue("info.properties","url");
        writeProperties("info.properties","age","21");
        readProperties("info.properties" );
        System.out.println("OK");
    }
}