字符串和输入流互转

 /**
     * 将一个字符串转化为输入流
     */
    public static InputStream getStringStream(String sInputString)
    {
        if (sInputString != null && !sInputString.trim().equals(""))
        {
            try
            {
                ByteArrayInputStream tInputStringStream = new ByteArrayInputStream(sInputString.getBytes());
                return tInputStringStream;
            }
            catch (Exception ex)
            {
                ex.printStackTrace();
            }
        }
        return null;
    }

    /**
     * 将一个输入流转化为字符串
     */
    public static String getStreamString(InputStream tInputStream)
    {
        if (tInputStream != null)
        {
            try
            {
                BufferedReader tBufferedReader = new BufferedReader(new InputStreamReader(tInputStream));
                StringBuffer tStringBuffer = new StringBuffer();
                String sTempOneLine = new String("");
                while ((sTempOneLine = tBufferedReader.readLine()) != null)
                {
                    tStringBuffer.append(sTempOneLine);
                }
                return tStringBuffer.toString();
            }
            catch (Exception ex)
            {
                ex.printStackTrace();
            }
        }
        return null;
    }