try {    
			  String encoding = "GBK"; // 字符编码(可解决中文乱码问题 )    
			  File file = new File("d:/aa.txt");   //文件位置 
			  if (file.isFile() && file.exists()) {    
			  InputStreamReader read = new InputStreamReader(    
					  new FileInputStream(file), encoding);    
			  BufferedReader bufferedReader = new BufferedReader(read);
			  String lineTXT = null;
			  while ((lineTXT = bufferedReader.readLine()) != null) {
				  str+=lineTXT.toString();
				  
				  }
			  read.close();
			  }else{
				  System.out.println("找不到指定的文件！");
				  }
			  } catch (Exception e) {
				  System.out.println("读取文件内容操作出错");
				  e.printStackTrace();
				  }