1、構造手機驗證碼：使用random對象生成要求的隨機數(shù)作為驗證碼，例如4位驗證碼:1000~9999之間隨機數(shù)；

2、使用接口向短信平臺發(fā)送手機號和驗證碼數(shù)據(jù)，然后短信平臺再把驗證碼發(fā)送到制定手機號上，接口參數(shù)一般包括：目標手機號，隨機驗證碼(或包含失效時間)，平臺接口地址，平臺口令；

3、保存接口返回的信息（一般為json文本數(shù)據(jù)，然后需轉換為json對象格式）；

4、將手機號--驗證碼、操作時間存入Session中，作為后面驗證使用；

5、接收用戶填寫的驗證碼及其他數(shù)據(jù)；

6、對比提交的驗證碼與Session中的驗證碼是否一致，同時判斷提交動作是否在有效期內(nèi)；

7、驗證碼正確且在有效期內(nèi)，請求通過，處理相應的業(yè)務。

一，首先添加一個jar包，工具類會用到。

<dependency>
??<groupId>commons-codecgroupId>
??<artifactId>commons-codecartifactId>
??<version>1.11version>
dependency>

二、我這里只是編寫一個簡單的短信驗證功能，要是用其他的語音驗證。。。。等等需要去秒滴云官方下載文檔，下面是編寫的一個config文檔，專門存放一些參數(shù)

三、編寫http請求工具類

public?class?HttpUtil
{
???/**
????*?構造通用參數(shù)timestamp、sig和respDataType
????*
????*?@return
????*/
???public?static?String?createCommonParam()
???{
??????//?時間戳
??????SimpleDateFormat?sdf?=?new?SimpleDateFormat("yyyyMMddHHmmss");
??????String?timestamp?=?sdf.format(new?Date());


??????//?簽名
??????String?sig?=?DigestUtils.md5Hex(Config.ACCOUNT_SID?+?Config.AUTH_TOKEN?+?timestamp);


??????return?"×tamp="?+?timestamp?+?"&sig="?+?sig?+?"&respDataType="?+?Config.RESP_DATA_TYPE;
???}


???/**
????*?post請求
????*
????*?@param?url
????*?功能和操作
????*?@param?body
????*?要post的數(shù)據(jù)
????*?@return
????*?@throws?IOException
????*/
???public?static?String?post(String?url,?String?body)
???{
??????System.out.println("url:"?+?System.lineSeparator()?+?url);
??????System.out.println("body:"?+?System.lineSeparator()?+?body);


??????String?result?=?"";
??????try
??????{
?????????OutputStreamWriter?out?=?null;
?????????BufferedReader?in?=?null;
?????????URL?realUrl?=?new?URL(url);
?????????URLConnection?conn?=?realUrl.openConnection();


?????????//?設置連接參數(shù)
?????????conn.setDoOutput(true);
?????????conn.setDoInput(true);
?????????conn.setConnectTimeout(5000);
?????????conn.setReadTimeout(20000);
?????????conn.setRequestProperty("Content-Type",?"application/x-www-form-urlencoded");
?????????//?提交數(shù)據(jù)
?????????out?=?new?OutputStreamWriter(conn.getOutputStream(),?"UTF-8");
?????????out.write(body);
?????????out.flush();


?????????//?讀取返回數(shù)據(jù)
?????????in?=?new?BufferedReader(new?InputStreamReader(conn.getInputStream(),?"UTF-8"));
?????????String?line?=?"";
?????????boolean?firstLine?=?true;?//?讀第一行不加換行符
?????????while?((line?=?in.readLine())?!=?null)
?????????{
????????????if?(firstLine)
????????????{
???????????????firstLine?=?false;
????????????}?else
????????????{
???????????????result?+=?System.lineSeparator();
????????????}
????????????result?+=?line;
?????????}
??????}?catch?(Exception?e)
??????{
?????????e.printStackTrace();
??????}
??????return?result;
???}


???/**
????*?回調(diào)測試工具方法
????*
????*?@param?url
????*?@param?reqStr
????*?@return
????*/
???public?static?String?postHuiDiao(String?url,?String?body)
???{
??????String?result?=?"";
??????try
??????{
?????????OutputStreamWriter?out?=?null;
?????????BufferedReader?in?=?null;
?????????URL?realUrl?=?new?URL(url);
?????????URLConnection?conn?=?realUrl.openConnection();


?????????//?設置連接參數(shù)
?????????conn.setDoOutput(true);
?????????conn.setDoInput(true);
?????????conn.setConnectTimeout(5000);
?????????conn.setReadTimeout(20000);


?????????//?提交數(shù)據(jù)
?????????out?=?new?OutputStreamWriter(conn.getOutputStream(),?"UTF-8");
?????????out.write(body);
?????????out.flush();


?????????//?讀取返回數(shù)據(jù)
?????????in?=?new?BufferedReader(new?InputStreamReader(conn.getInputStream(),?"UTF-8"));
?????????String?line?=?"";
?????????boolean?firstLine?=?true;?//?讀第一行不加換行符
?????????while?((line?=?in.readLine())?!=?null)
?????????{
????????????if?(firstLine)
????????????{
???????????????firstLine?=?false;
????????????}?else
????????????{
???????????????result?+=?System.lineSeparator();
????????????}
????????????result?+=?line;
?????????}
??????}?catch?(Exception?e)
??????{
?????????e.printStackTrace();
??????}
??????return?result;
???}
}

四、生成四位數(shù)的方法

public?static?String?runNumber()?{
???String?str="ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
???StringBuilder?sb=new?StringBuilder(4);
???for(int?i=0;i<4;i++)
???{
??????char?ch=str.charAt(new?Random().nextInt(str.length()));
??????sb.append(ch);
???}
???System.out.println(sb.toString());
???String?code?=?sb.toString();
???return?code;
}

4、執(zhí)行方法execute()，便會發(fā)送成功

public?class?IndustrySMS
{
???private?static?String?operation?=?"/industrySMS/sendSMS";


???private?static?String?accountSid?=?Config.ACCOUNT_SID;
???private?static?String?to?=?"15342349382";
??private?static?String?smsContent?=?"【小陶科技】登錄驗證碼：{"+runNumber().toString()+"}，如非本人操作，請忽略此短信。";


???/**
????*?驗證碼通知短信
????*/
???public?static?void?execute()
???{
??????String?tmpSmsContent?=?null;
???????try{
?????????tmpSmsContent?=?URLEncoder.encode(smsContent,?"UTF-8");
???????}catch(Exception?e){
???????}
???????String?url?=?Config.BASE_URL?+?operation;
???????String?body?=?"accountSid="?+?accountSid?+?"&to="?+?to?+?"&smsContent="?+?tmpSmsContent
???????????+?HttpUtil.createCommonParam();


???????//?提交請求
???????String?result?=?HttpUtil.post(url,?body);
???????System.out.println("result:"?+?System.lineSeparator()?+?result);
}

獲得原創(chuàng)整理：《第2版：互聯(lián)網(wǎng)大廠面試題》