io读取文件内容 Java

读取某个文件的内容

	File file=new File("D:\\t.txt");
		try {
			InputStream in=new FileInputStream(file);
			BufferedReader  bf=new BufferedReader(new InputStreamReader(in));
			String str="";
			String line="";
			while((str=bf.readLine())!=null){
				System.out.println(str);
				line +=str;
			}
			System.out.println(line);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

相同的效果；

	public String readData(String url) { 
//	     String url = "C:/data.txt"; 
	    StringBuffer sb = new StringBuffer(); 
	    try { 
	         FileReader read = new FileReader(new File(url)); 
	         BufferedReader br=new BufferedReader(read); 
	         String line; 
	         while((line=br.readLine())!=null){ 
	        	 
	        	    sb.append(line); 
		            sb.append("\n"); 
	        	 
	        
	          } 
	        
	     } catch (FileNotFoundException e) { 
	          e.printStackTrace(); 
	     } catch (IOException e) { 
	        e.printStackTrace(); 
	     } 
	     return sb.toString(); 
	}