生成60w手机号接口，返回下载路径

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@PostMapping("/exportTwo")
@ResponseBody
public AjaxResult exportTwo()
{
    String downloadPath="";
    try {
        FileOutputStream fileOutputStream=null;
        BufferedWriter bufferedWriter=null;
        downloadPath = Global.getDownloadPath() + UUID.randomUUID()+".txt";
        File desc = new File(downloadPath);
        if (!desc.getParentFile().exists())
        {
            desc.getParentFile().mkdirs();
        }
        bufferedWriter = new BufferedWriter(new FileWriter(downloadPath));
        for (int i = 0; i < 600000; i++) {
            bufferedWriter.write(generatePhoneNum()+"\r\n");
        }
        bufferedWriter.close();
        fileOutputStream.close();
    }catch (Exception e){

    }
    return AjaxResult.success(downloadPath);
}

public String generatePhoneNum() {
    //匹配国内手机号的正则（注意： js中d前面只有一个‘\’ ，java的是两个“\”）
    String s = "^((1[3|8][0-9])|(14[5|7])|(15([0-3]|[5-9])|(16[5|6]))|(17[0-8])|(19[8|9]))\\d{8}$";
    Pattern r = Pattern.compile(s);
    String phoneNum = "";
    Matcher matcher = r.matcher(phoneNum);
    do {
        phoneNum = autoGenerate();
        matcher = r.matcher(phoneNum);
    } while (matcher.matches() != true);
    return phoneNum;
}

private String autoGenerate() {
    Random random = new Random();
    StringBuffer buffer = new StringBuffer();
    buffer.append("1");
    for (int i = 0; i < 10; i++) {
        int num = random.nextInt(10);
        buffer.append(num);
    }
    return buffer.toString();
}

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