字节，字符流转换工具

1、字节流转换为String

    /**     * 将字节流转换为字符串     * @param is     * @return     */    private String getStringFromStream(InputStream is){        int len=0;        byte[] b=new byte[1024];        ByteArrayOutputStream bos=new ByteArrayOutputStream();        try {            while((len=is.read(b))!=-1){                bos.write(b);            }        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        String str=new String(bos.toByteArray());        return str;    }