Properties属性文件

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.HashMap;
import java.util.Map;
import java.util.Properties;

public class PropertiesFile {
 /**
  * 功能：读取属性文件全部的值
  * @param fileNamePath
  * @throws IOException
  */
 public static Map readProperties(String fileNamePath) throws IOException {
  Properties props = new Properties();
  Map map = new HashMap();
  InputStream in = null;
  try {
   in = new BufferedInputStream(new FileInputStream(fileNamePath));
   props.load(in);
   Enumeration en = props.propertyNames();
   while (en.hasMoreElements()) {
    String key = (String) en.nextElement();
    String Property = props.getProperty(key);
    map.put(key, Property);
   }
  } catch (Exception e) {
   if(null!=in)
    in.close();
   e.printStackTrace();
  } finally {
   if(null!=in)
    in.close();
  }
  return map;
 }
 /**
  * 功能：获取属性文件对应的key的值
  * @param fileNamePath
  * @param key
  * @return
  * @throws IOException
  */
 public static String getPropertiesValue(String fileNamePath, String key)
    throws IOException {
  Properties props = new Properties();
  InputStream in = null;
  try {
   in = new FileInputStream(fileNamePath);
   props.load(in);
   String value = props.getProperty(key);
   return value;
  } catch (IOException e) {
   e.printStackTrace();
   return null;
  } finally {
   if(null!=in)
    in.close();
  }
 }
 /**
  * 功能：设置属性文件的值
  * @param fileNamePath
  * @param parameterName
  * @param parameterValue
  * @throws IOException
  */
 public static void setPropertiesValue(String fileNamePath, String parameterName,
   String parameterValue) throws IOException {
  Properties prop = new Properties();
  InputStream in = null;
  OutputStream out = null;
  try {
   in = new FileInputStream(fileNamePath);
   prop.load(in);
   out = new FileOutputStream(fileNamePath);
   prop.setProperty(parameterName, parameterValue);
   prop.store(out, parameterName);
   out.flush();
   out.close();
  } catch (IOException e) {
   e.printStackTrace();
  } finally {
   if(null!=in)
    in.close();
   if(null!=out)
    out.close();
  }
 }
 
}