把流转化为字符串

** 由于把流转化为字符串是一个非常常见的操作,所以抽出来做成一个工具类* */public class StreamTools {    public static String readStream(InputStream in) throws Exception {        //定义一个内存输出流        ByteArrayOutputStream baos = new ByteArrayOutputStream();        int len = -1;        byte[] buffer = new byte[1024];//1kb        while ((len = in.read(buffer)) != -1) {            baos.write(buffer, 0, len);        }        in.close();        String content = new String(baos.toByteArray());        return content;    }}