读取文件的相关

public static void main(String[] args) throws IOException { 
   //File dir = new File("D:\\files\\file","/file11");
  // dir.mkdirs();
  File file = new File("../common");
  String canoPath = file.getCanonicalPath(); //此种的..做解析 
  String absPath = file.getAbsolutePath(); // 此种的.. 不做解析
  System.out.println(canoPath +"  "+absPath);
 } 

 上面是第一点

 下面就是读取

try {
			FileInputStream fi =new FileInputStream(new File("d:\\a.txt"));
			BufferedInputStream bf =new BufferedInputStream(fi);
			StringBuffer sb =new StringBuffer();
		    if(bf.available()>0){
		    	int i  = 0;		    	
		    	 while(i!=-1){ // 此处不能用fi.read!=-1 这样的话在加上下面的则相当于读了两次
		    		  i = bf.read();
		    		  sb.append((char)i);
		    	 }		    	 
		    }
		   bf.close();
		   System.out.println(sb.toString());
		   BufferedReader br = new BufferedReader(new FileReader("d:\\a.txt"));
		   String line = "";
		   while((line=br.readLine())!=null){
			   System.out.println(line); 
		   }
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}