java从properties文件中读取和写入属性

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configuration.properties中的文件内容如下

#name
#Mon Aug 20 13:58:41 CST 2012
\u4F5C\u7528=\u7528\u6765\u6D4B\u8BD5\u73A9\u7684\uFF0C\u5475\u5475...
name=testGetPropertiesValue
value=127.0.0.1
driver=oracle
\u59D3\u540D=\u674E
*********************************************************************************************************************

//ConfigUtil.java
package liweiTest;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
public class ConfigUtil
{
  
 private static Properties props = null;
 static
 {
  props = new Properties();
     reLoad();
 }
   //加载属性文件
 private static void reLoad()
 {
  try
  {
   InputStream input = ConfigUtil.class.getResourceAsStream("/configuration.properties");
   props.load(input);
  }
  catch (Exception ex)
  {
   System.out.println("exceptiom:"+ex);
  }
 }
 //获取当前文件的路径，返回成FileOutputStream
 public static FileOutputStream getUrl()
 {
  String url = ConfigUtil.class.getClassLoader().getResource(".").getPath(); 
  FileOutputStream file = null;
  try 
  {
   file = new FileOutputStream(url + File.separator + "configuration.properties");
  } 
  catch (FileNotFoundException e) 
  {
   e.printStackTrace();
  } // 指定要操作的文件
  return file;
 }
 
    //获取某个键的属性
 public static String getString(String name)
 {
  try 
  {
   return props.getProperty(name);
  } catch (Exception ex) 
  {
   System.out.println("exceptiom:"+ex);
   return null;
  }
 }
 
    /**
     * @param name 名称
     * @param def 参数
     * @return 结果
     */
    public static String getString(String name, String def)
    {
        String retval = null;
        try
        {
            retval = props.getProperty(name);
            retval = retval == null ? def : retval;
        }
        catch (Exception ex)
        {
            logger.error("", ex);
        }
        return retval;
    }
 
   //对configuration.properties进行遍历,获取全部的键值和属性值 
 public static HashMap<String,String> getAll()
 {
  Set<String> names = props.stringPropertyNames();
  HashMap<String,String> map = new HashMap<String,String>();  
  for(String name:names)
  {
   map.put(name, props.getProperty(name));
  }
  return map; 
 }
 
   //写入一对属性到 configuration.properties文件中
 public static void setValue(String name,String value)
 {
  props.setProperty(name,value) ; // 设置属性
  try 
  {
   props.store(getUrl(),"放入一对属性");
  } 
  catch (IOException e) 
  {
   e.printStackTrace();
  } // 保存属性到普通文件
 }
 
 //同时写入多个属性到 configuration.properties文件中
 public static void setAllValue(Map<String,String> map)
 {
  for(Map.Entry<String,String>me:map.entrySet())
  {
   props.setProperty(me.getKey(),me.getValue()) ; // 设置属性
  }  
  
  try 
  {
   props.store(getUrl(),"放入多个属性");
  } 
  catch (IOException e) 
  {
   e.printStackTrace();
  } // 保存属性到普通文件
 }
 public static void main(String[] args) 
 {
  System.out.println(ConfigUtil.getString("name"));
  System.out.println(ConfigUtil.getString("name2","qwertyuiop"));
  setValue("姓名", "李WEI123");
  HashMap<String ,String> map = new HashMap<String,String>();
  map.put("driver","oracle");
  map.put("value", "127.0.0.1");
  map.put("作用", "用来测试玩的，呵呵...");
  setAllValue(map);
  System.out.println(ConfigUtil.getString("姓名"));
  HashMap<String ,String> map2 = getAll();
  for(Map.Entry<String, String>m:map2.entrySet())
  {
   System.out.println(m.getKey()+" = "+m.getValue());
  }
 }
}