微信小程序获取手机号后台springboot开发

微信小程序获取手机号需要后台进行解密

以java为例

想要获取用户在小程序里面的手机号,需要用户先在小程序里面登录,因为微信小程序提供的登录接口(这个接口在微信开发文档里面有)里面返回值有一个code,
前端拿到这个code后再进行访问微信的另外一个接口,传三个参数:刚获取的code和appId和appSecret(appId和appSecret在小程序管理后台可以看见)

String params = "appid=" + appId + "&secret=" + appSecret + "&js_code=" + code + "&grant_type=" + "authorization_code";
// 发送请求
String result = HttpRequest.sendGet("https://api.weixin.qq.com/sns/jscode2session", params);
return jsonObject.getString("session_key");

我是用java写的,你们可以根据自己情况改

获取到sessionKey之后

前端在访问一个微信小程序提高的获取手机号接口,得到三个返回值,其中有两个返回值(encryptedData和iv使我们解密的时候需要用到的)再搭配刚才获取的sessionKey把这三个值传给java后端,后端进行解密

后端需要干的工作:

导入依赖

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.bouncycastle</groupId>
            <artifactId>bcprov-jdk15on</artifactId>
            <version>1.68</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.79</version>
        </dependency>
        <dependency>
            <groupId>commons-codec</groupId>
            <artifactId>commons-codec</artifactId>
            <version>1.15</version>
        </dependency>

        <dependency>
            <groupId>org.bouncycastle</groupId>
            <artifactId>bcprov-jdk16</artifactId>
            <version>1.46</version>
        </dependency>

第一步

定义接口获取前端提供的三个参数

@RequestMapping("/phone")
    public String getPhone(
            @RequestParam("encryptedData") String encryptedData,
            @RequestParam("sessionKey") String sessionKey,
            @RequestParam("iv") String iv) {
        return decrypt(encryptedData, sessionKey, iv);
    }

第二步

定义解密方法对这三个方法进行解密

    /**
     * 解密数据
     *
     * @return
     * @throws Exception
     */
    public static String decrypt(String encryptedData, String sessionKey, String iv) {

        String result = "";
        try {
            AES aes = new AES();
            byte[] resultByte = aes.decrypt(Base64.decodeBase64(encryptedData), Base64.decodeBase64(sessionKey), Base64.decodeBase64(iv));
            if (null != resultByte && resultByte.length > 0) {
                result = new String(WxPKCS7Encoder.decode(resultByte));
                // 这里也可以让前端把appid传过来,在做一下检验,我没做,懒得做
            }
        } catch (Exception e) {
            result = "";
            e.printStackTrace();
        }
        return result;
    }

将解密和工具类创建好

package com.zhm.utls;

import java.security.AlgorithmParameters;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.Security;
 
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
 
/**
 * AES加密
 */
public class AES {
	public static boolean initialized = false;
	/**
	 * AES解密
	 * @param content
	 *            密文
	 * @return
	 * @throws InvalidAlgorithmParameterException
	 * @throws NoSuchProviderException
	 */
	public byte[] decrypt(byte[] content, byte[] keyByte, byte[] ivByte) throws InvalidAlgorithmParameterException {
		initialize();
		try {
			Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
			Key sKeySpec = new SecretKeySpec(keyByte, "AES");
			cipher.init(Cipher.DECRYPT_MODE, sKeySpec, generateIV(ivByte));// 初始化
			byte[] result = cipher.doFinal(content);
			return result;
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		} catch (NoSuchPaddingException e) {
			e.printStackTrace();
		} catch (InvalidKeyException e) {
			e.printStackTrace();
		} catch (IllegalBlockSizeException e) {
			e.printStackTrace();
		} catch (BadPaddingException e) {
			e.printStackTrace();
		} catch (NoSuchProviderException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}
 
	public static void initialize() {
		if (initialized){
			return;
		}
		Security.addProvider(new BouncyCastleProvider());
		initialized = true;
	}
 
	// 生成iv
	public static AlgorithmParameters generateIV(byte[] iv) throws Exception {
		AlgorithmParameters params = AlgorithmParameters.getInstance("AES");
		params.init(new IvParameterSpec(iv));
		return params;
	}
}

第二个解密工具类

package com.zhm.utls;
 
import java.nio.charset.Charset;
import java.util.Arrays;
 
 
/**
 * 微信小程序加解密
 * @author liuyazhuang
 *
 */
public class WxPKCS7Encoder {
	private static final Charset CHARSET = Charset.forName("utf-8");
	private static final int BLOCK_SIZE = 32;
 
	/**
	 * 获得对明文进行补位填充的字节.
	 *
	 * @param count
	 *            需要进行填充补位操作的明文字节个数
	 * @return 补齐用的字节数组
	 */
	public static byte[] encode(int count) {
		// 计算需要填充的位数
		int amountToPad = BLOCK_SIZE - (count % BLOCK_SIZE);
		if (amountToPad == 0) {
			amountToPad = BLOCK_SIZE;
		}
		// 获得补位所用的字符
		char padChr = chr(amountToPad);
		String tmp = new String();
		for (int index = 0; index < amountToPad; index++) {
			tmp += padChr;
		}
		return tmp.getBytes(CHARSET);
	}
 
	/**
	 * 删除解密后明文的补位字符
	 *
	 * @param decrypted
	 *            解密后的明文
	 * @return 删除补位字符后的明文
	 */
	public static byte[] decode(byte[] decrypted) {
		int pad = decrypted[decrypted.length - 1];
		if (pad < 1 || pad > 32) {
			pad = 0;
		}
		return Arrays.copyOfRange(decrypted, 0, decrypted.length - pad);
	}
 
	/**
	 * 将数字转化成ASCII码对应的字符，用于对明文进行补码
	 *
	 * @param a
	 *            需要转化的数字
	 * @return 转化得到的字符
	 */
	public static char chr(int a) {
		byte target = (byte) (a & 0xFF);
		return (char) target;
	}
}

你也可以写成一个,根据自己需求来