从文件读入流IO

//从文件读入流(每行读取)
    public boolean validate(String str)
    {
        // 设置按钮已经被点击
        if (!f)
        {
            f = true;
        }
       
        String s;
        try
        {
            FileInputStream is = new FileInputStream("G://zhnagtao//test.txt"); // 读出指定的文件，二进制流
            InputStreamReader ir = new InputStreamReader(is); // 读取二进制格式，字符流
            BufferedReader in = new BufferedReader(ir); // 读取字符流，变成反冲字符流
            while ((s = in.readLine()) != null)
            {
                // 以行读取
                String[] sArray = s.split(" ");
                if (sArray[0].equals(str))
                {
                    return true;
                }
               
            }
            in.close();
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
       
        return false;
    }