java读写文件

写入文件：

public void saveToFile(String fileName, InputStream in) throws IOException { 
	    FileOutputStream fos = null;    
	    BufferedInputStream bis = null;    
//	    HttpURLConnection httpUrl = null;    
//	    URL url = null;    
	    int BUFFER_SIZE = 1024; 
	    byte[] buf = new byte[BUFFER_SIZE];    
	    int size = 0;    
//	        
//	    //建立链接    
//	    url = new URL(destUrl);    
//	    httpUrl = (HttpURLConnection) url.openConnection();    
//	    //连接指定的资源    
//	    httpUrl.connect();    
//	    //获取网络输入流    
	    bis = new BufferedInputStream(in);    
//	    //建立文件    
	    fos = new FileOutputStream(fileName);    
//	   
//	    //保存文件    
	    while ( (size = bis.read(buf)) != -1)     
	      fos.write(buf, 0, size);    
//	        
	    fos.close();    
	    bis.close();    
//	    httpUrl.disconnect();    
	  }

读取文件：

FileInputStream fis = new FileInputStream(String filename);
			BufferedInputStream bis = new BufferedInputStream(fis);