java通過URL擷取常值內容

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原文地址https://www.cnblogs.com/myadmin/p/7634262.html

public static String readFileByUrl(String urlStr) {        String res=null;        try {            URL url = new URL(urlStr);              HttpURLConnection conn = (HttpURLConnection)url.openConnection();              //設定逾時間為3秒            conn.setConnectTimeout(3*1000);            //防止屏蔽程式抓取而返回403錯誤            conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");            //得到輸入資料流            InputStream inputStream = conn.getInputStream();              res = readInputStream(inputStream);        } catch (Exception e) {            logger.error("通過url地址擷取常值內容失敗 Exception：" + e);        }        return res;    }

/**     * 從輸入資料流中擷取字串     * @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();          System.out.println(new String(bos.toByteArray(),"utf-8"));        return new String(bos.toByteArray(),"utf-8");    }  

java通過URL擷取常值內容