Java操作Properties文件

package com.club.soap.tools;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;
import java.util.ResourceBundle;

/**
 *  类描述：Propertites文件操作工具类
 */
public final class PropertiesUtils {
 
 static final String PROPER_PATH = "com/club/soap/tools/SysConfig.properties";
 
 
 public static String getProperty(String filePath, String key) throws IOException{
  if(filePath == null){
   filePath = PROPER_PATH;
  }
  //创建一个属性集，用于Properties可以保存在流中或从流中加载
  Properties _properties = new Properties();
  
  FileInputStream fis = new FileInputStream(StringUtils.getFileFullPath(filePath));
  
  _properties.load(fis);
  
  fis.close();
  
  return _properties.getProperty(key);
  
 }
 
 public static String getProperty(String key) throws IOException{
  return getProperty(PROPER_PATH, key);
 }
 
 
 public static void setProperty(String filePath, String key, String value) throws Exception{
  
  if(filePath == null){
   filePath = StringUtils.getFileFullPath(PROPER_PATH);
  }
  //1.读取properties文件内容，
  
  //文件输入流
  FileInputStream fin = new FileInputStream(filePath);
  
  //字节流转化字符流
  InputStreamReader inputStreamReader = new InputStreamReader(fin);
  
  BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
  
  
  //2.修改Properties文件中属性键对应的键值
  
  List contentList = new ArrayList();
  
  String line = "";
   
  key = key + "=";
  
  while((line = bufferedReader.readLine()) != null){
   if(line.trim().indexOf(key) != -1){
    
    key = key + value;
    contentList.add(key);
   }else{
    contentList.add(line);
   } 
  }
  bufferedReader.close();
  inputStreamReader.close();
  fin.close();
  
  //3.删除原有Properties文件，并创建新文件,重新写入
  File file = new File(filePath);
  
  if(file.exists()){
   file.delete();
   file.createNewFile();
  }
  file.canWrite();
  FileWriter fileWriter = new FileWriter(file,true);
  
  Iterator it = contentList.iterator();
  while(it.hasNext()){
   fileWriter.write(it.next().toString() + "\r\n");
   
  }
  fileWriter.flush();
  fileWriter.close(); 
 }
 
 public static String getKeyValue(String key){
  ResourceBundle resourceBundle = null;
  String value = "";
  
  resourceBundle = ResourceBundle.getBundle("com.club.soap.tools.SysConfig");
  
  value = StringUtils.toChinese(resourceBundle.getString(key));
  
  return value;
 }
 
 
 public static void main(String[] args) throws Exception {
  //修改前
  System.out.println(PropertiesUtils.getProperty(null, "DB.DRIVER"));
  
  PropertiesUtils.setProperty(null, "DB.DRIVER", "sdfsdf121212aa12aacc");
  //修改后
  System.out.println(PropertiesUtils.getProperty(null, "DB.DRIVER"));
  

 }

}

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