Java根据文件路径/http路径获取文件内容

    /**
     * 根据文件路径读取文件内容
     * @param filePath
     * @return
     */
    public static String readFileContent(String filePath) {
        StringBuilder result = new StringBuilder();
        try {
            BufferedReader bfr = new BufferedReader(new InputStreamReader(new FileInputStream(new File(filePath)), Constants.UTF8));
            String lineTxt = null;
            while ((lineTxt = bfr.readLine()) != null) {
                result.append(lineTxt);
            }
            bfr.close();
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
        return result.toString();
    }

    /**
     * 根据http路径读取文件内容
     * @param urlStr
     * @return
     */
    public static String readFileByUrl(String urlStr) {
        String res = null;
        try {
            URL url = new URL(urlStr);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            //设置超时间为3秒
            conn.setConnectTimeout(3 * 1000);
            //防止屏蔽程序抓取而返回403错误
            conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
            //得到输入流
            InputStream inputStream = conn.getInputStream();
            res = readInputStream(inputStream);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return res;
    }


    /**
     * 从输入流中获取字符串
     * @param inputStream
     * @return
     * @throws IOException
     */
    public static String readInputStream(InputStream inputStream) throws IOException {
        byte[] buffer = new byte[1024];
        int len = 0;
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        while ((len = inputStream.read(buffer)) != -1) {
            bos.write(buffer, 0, len);
        }
        bos.close();
        return new String(bos.toByteArray(), "utf-8");
    }