java手机发送验证码

1.导第三方jar包。

2.编写生成验证码的类。

import java.security.MessageDigest;

public class CheckSumBuilder {
	//计算并获取checkSum
    public static String getCheckSum(String appSecret,String nonce,String curTime){
        return encode("SHA",appSecret+nonce+curTime);
    }

    private static String encode(String algorithm,String value){
        if(value==null){
            return null;
        }

        try {
            MessageDigest messageDigest=MessageDigest.getInstance(algorithm);
            messageDigest.update(value.getBytes());
            return getFormattedText(messageDigest.digest());
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    private static String getFormattedText(byte[] bytes){
        int len=bytes.length;
        StringBuilder sb=new StringBuilder(len*2);
        for(int $i=0;$i<len;$i++){
            sb.append(HEX_DIGITS[(bytes[$i]>>4)&0x0f]);
            sb.append(HEX_DIGITS[bytes[$i]&0x0f]);
        }
        return sb.toString();
    }

    private static final char[] HEX_DIGITS={'0','1','2','3','4','5','6',
            '7','8','9','a','b','c','d','e','f'};

}

3.编写测试类。

import java.io.IOException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import com.alibaba.fastjson.JSON;

public class Test2018 {
	//发送验证码的请求路径URL
    private static final String
            SERVER_URL="https://api.netease.im/sms/sendcode.action";
    //网易云信分配的账号，请替换你在管理后台应用下申请的Appkey
    private static final String 
            APP_KEY="";//填写自己的APP_KEY
    //网易云信分配的**，请替换你在管理后台应用下申请的appSecret
    private static final String APP_SECRET="";//填写自己的appSecret
    //随机数
    private static final String NONCE="123456";
public static void main(String[] args) {
	String s="";//填写要发送的手机号码
	 try {
         String str = new Test2018().sendMsg(s);
         if("success".equals(str)){
             System.out.println("发送成功！");
         }else{
             System.out.println("发送失败！");
         }
     } catch (Exception e) {
         // TODO: handle exception
         e.printStackTrace();
     }
}
    public static String sendMsg(String phone) throws IOException {
        CloseableHttpClient httpclient = HttpClients.createDefault();
        HttpPost post = new HttpPost(SERVER_URL);

        String curTime=String.valueOf((new Date().getTime()/1000L));
        String checkSum=CheckSumBuilder.getCheckSum(APP_SECRET,NONCE,curTime);

        //设置请求的header
        post.addHeader("AppKey",APP_KEY);
        post.addHeader("Nonce",NONCE);
        post.addHeader("CurTime",curTime);
        post.addHeader("CheckSum",checkSum);
        post.addHeader("Content-Type","application/x-www-form-urlencoded;charset=utf-8");

        //设置请求参数
        List<NameValuePair> nameValuePairs =new ArrayList<>();
        nameValuePairs.add(new BasicNameValuePair("mobile",phone));

        post.setEntity(new UrlEncodedFormEntity(nameValuePairs,"utf-8"));

        //执行请求
        HttpResponse response=httpclient.execute(post);
        String responseEntity= EntityUtils.toString(response.getEntity(),"utf-8");

        //判断是否发送成功，发送成功返回true
        String code= JSON.parseObject(responseEntity).getString("code");//判断是否发送成功
        String obj= JSON.parseObject(responseEntity).getString("obj");//返回验证码
        System.out.println(code);
        if (code.equals("200")){
            return "success";
        }
        return "error";
    }
}

详细了解需参考发送验证码的开发者手册。