InputStream转换String三种方式

    public static String inputStream2String(InputStream is) throws IOException {
        BufferedReader in = new BufferedReader(new InputStreamReader(is));
        StringBuffer buffer = new StringBuffer();
        String line = "";
        while ((line = in.readLine()) != null) {
            buffer.append(line);
        }
         return buffer.toString();
//        return new String(buffer.toString().getBytes("ISO-8859-1"), "utf-8");
    }


    public static String input2byte(InputStream inStream) throws IOException {
        ByteArrayOutputStream swapStream = new ByteArrayOutputStream();
        byte[] buff = new byte[100];
        int rc = 0;
        while ((rc = inStream.read(buff, 0, 100)) > 0) {
            swapStream.write(buff, 0, rc);
        }
        byte[] in2b = swapStream.toByteArray();
        return new String(in2b, "UTF-8");
    }


    // 带编码的
    public static String is2String(InputStream in) throws IOException {
        StringBuffer out = new StringBuffer();
        InputStreamReader inread = new InputStreamReader(in, "UTF-8");
        char[] b = new char[4096];
        for (int n; (n = inread.read(b)) != -1;) {
            out.append(new String(b, 0, n));
        }
        return out.toString();
    }