java 读入数据

//把一篇文章当作一个String读入
    public static String readFile(String file) throws FileNotFoundException, IOException
    {
        StringBuffer strSb = new StringBuffer(); //String is constant， StringBuffer can be changed.
        InputStreamReader inStrR = new InputStreamReader(new FileInputStream(file), "utf-8"); //byte streams to character streams
        BufferedReader br = new BufferedReader(inStrR); 
        String line = br.readLine();
        while(line != null){
            strSb.append(line).append("\r\n");
            line = br.readLine();    
        }

        return strSb.toString();
    }