将输入流转为字符串工具类

public class StreamTools {
    public static String readFromStream(InputStream is) throws IOException{
        ByteArrayOutputStream baos=new ByteArrayOutputStream();
        byte[] buffer=new byte[1024];
        int len=0;
        while ((len=is.read(buffer))!=-1) {
            baos.write(buffer, 0, len);
        }
        is.read();
        String result=baos.toString();
        baos.close();
        return result;
    }
}