输入流转换成字符串

public  class Utils {
    public static String getTextFromStream(InputStream is){
        int len=0;
        byte[] b=new byte[1024];
        ByteArrayOutputStream baos=new ByteArrayOutputStream();
        try {
            while((len=is.read(b))!=-1){
                baos.write(b,0,len);

            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        String text=new String(baos.toByteArray());
        return text;
    }
}