Java对properties配置文件的操作

/*   * Created on 2005-1-4   *   * TODO To change the template for this generated file go to   * Window - Preferences - Java - Code Style - Code Templates   */  package com.yorsun;

import java.io.File;  import java.io.FileInputStream;  import java.io.FileNotFoundException;  import java.io.FileOutputStream;  import java.io.IOException;  import java.util.Properties;

import javax.servlet.ServletContext;  import javax.servlet.http.HttpServlet;

/**   * @author Administrator   *   * TODO To change the template for this generated type comment go to Window -   * Preferences - Java - Code Style - Code Templates   */  public class PropertiesUnit {   private String filename;

 private Properties p;

 private FileInputStream in;

 private FileOutputStream out;

 public PropertiesUnit(String filename) {    this.filename = filename;    File file = new File(filename);    try {     in = new FileInputStream(file);     p = new Properties();     p.load(in);     in.close();    } catch (FileNotFoundException e) {     // TODO Auto-generated catch block     System.err.println("配置文件config.properties找不到！");     e.printStackTrace();    } catch (IOException e) {     // TODO Auto-generated catch block     System.err.println("读取配置文件config.properties错误！");     e.printStackTrace();    }   }

 public static String getConfigFile(HttpServlet hs) {    return getConfigFile(hs, "config.properties");   }

 /**    * @param hs    * @param configFileName    * @return configFile    */   private static String getConfigFile(HttpServlet hs, String configFileName) {    String configFile = "";    ServletContext sc = hs.getServletContext();    configFile = sc.getRealPath("/" + configFileName);    if (configFile == null || configFile.equals("")) {     configFile = "/" + configFileName;    }    // TODO Auto-generated method stub    return configFile;   }

 public void list() {    p.list(System.out);   }

 public String getValue(String itemName) {    return p.getProperty(itemName);   }

 public String getValue(String itemName, String defaultValue) {    return p.getProperty(itemName, defaultValue);   }

 public void setValue(String itemName, String value) {    p.setProperty(itemName, value);   }

 public void saveFile(String filename, String description) throws Exception {    try {     File f = new File(filename);     out = new FileOutputStream(f);     p.store(out, description);     out.close();    } catch (IOException ex) {     throw new Exception("无法保存指定的配置文件:" + filename);    }   }      public void saveFile(String filename) throws Exception{    saveFile(filename,"");   }      public void saveFile() throws Exception{    if(filename.length()==0)     throw new Exception("需指定保存的配置文件名");    saveFile(filename);   }      public void deleteValue(String value){    p.remove(value);   }      public static void main(String args[]){    String file="/eclipse/workspace/NewsTest/WEB-INF/config.properties";  //  String file="D:\\eclipse\\workspace\\NewsTest\\WEB-INF\\config.properties";    PropertiesUnit pu=new PropertiesUnit(file);    pu.list();   }

}