java直接读取网络文件到内存，不保存到本地

        StringBuffer sb = new StringBuffer();
        URL url = new URL("https://common.cnblogs.com/script/encoder.js");
        URLConnection conn = url.openConnection();
        InputStream inStream = conn.getInputStream();
        BufferedReader reader = new BufferedReader(new InputStreamReader(inStream));
        String tempString;  
        while ((tempString = reader.readLine()) != null) {
            sb.append(tempString.trim());
        }  
        reader.close();
        System.out.println(sb);

 注意try catch