properties配置文件的读取和写入

/**
* 类名：PropertiesUtil
* 功能：提供对properties配置文件的读取和写入
* @author ChengTao
*/
package com.xy.xyd.rest.biz.service.impl;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Properties;

public class PropertiesUtil {



/**
* 根据key值查找配置文件里的值
* @param key
* @return
*/
public String getProperty(String key){
      Properties prop = new Properties();
      // URL resource = Thread.currentThread().getContextClassLoader().getResource("");
      InputStream resourceAsStream =

                Thread.currentThread().getContextClassLoader().getResourceAsStream("properties/development/Parameter_xyd.properties");
      try {
            prop.load(resourceAsStream);
            prop.getProperty(key);
      } catch (FileNotFoundException e) {
            e.printStackTrace();
     } catch (IOException e) {
            e.printStackTrace();
      }
     return prop.getProperty(key);
}

/**
* 将文件加载到内存中，在内存中修改key对应的value值，再将文件保存 getFile
* @throws Exception
*/
public void setProper(String key,String value){
      Properties prop = new Properties();
      File file       new File(Thread.currentThread().getContextClassLoader().getResource("properties/development/Parameter_xyd.properties").getFile());      try {

          prop.setProperty(key, value);
          FileOutputStream fos = new FileOutputStream(file);
          prop.store(fos, null);
          fos.close();
     } catch (FileNotFoundException e) {
         e.printStackTrace();
     } catch (IOException e) {
         e.printStackTrace();
      }
}

//inputStream转outputStream
public ByteArrayOutputStream parse(InputStream in) throws Exception{

          ByteArrayOutputStream swapStream = new ByteArrayOutputStream();
          int ch;
          while ((ch = in.read()) != -1) {
              swapStream.write(ch);
          }
         return swapStream;
}

//outputStream转inputStream
public ByteArrayInputStream parse(OutputStream out) throws Exception{
         ByteArrayOutputStream baos=new ByteArrayOutputStream();
         baos=(ByteArrayOutputStream) out;
         ByteArrayInputStream swapStream = new ByteArrayInputStream(baos.toByteArray());
         return swapStream;
 }
}