微信小程序获取手机号，后端JAVA解密流程代码

小程序获取手机号，后端JAVA解密流程代码

微信官方文档获取手机号流程地址,先看下最好方便理解下面步骤
实现思路，步骤如下

1.前端需先调用官方wx.login接口获取登录凭证code。
2.后端接收code 调用官方接口地址获取用户秘钥 sessionKey。
3.前端通过官方getPhoneNumber获取encryptedData，iv
4.前端通过参数**【encryptedData】 、【iv】 、【sessionKey】** 发送请求后端接口，解密用户手机号

小程序获取sessionkey详细接口文档

后端工作如下，

• 1.参数code 解密出sessionKey
• {“session_key”:“eF9PAi5P7ZbSaQqkGzEY5g==”,“openid”:“otJ1I4zMSFGDtk7C33O_h6U3IRK8”}
• 2.参数sessionKey，iv，encryptedData 解密出手机号

代码如下：

下面工具类很全，放心代码必须全，良心教程。

业务代码Controller

package com.df.detection.controller;

import com.df.detection.base.entity.ResultBean;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiImplicitParam;
import io.swagger.annotations.ApiImplicitParams;
import org.apache.commons.codec.binary.Base64;
import org.json.JSONException;
import org.springframework.web.bind.annotation.*;

import java.io.UnsupportedEncodingException;
import java.security.InvalidAlgorithmParameterException;

import org.json.JSONObject;

/**
 * @Author Songzhongjin
 * @Date 2020/7/15 10:09
 * @Version 1.0
 */
@Api(value = "小程序登录授权 Controller",tags = {"小程序登录授权接口"})
@RestController
@RequestMapping("/app")
public class APPController {

  /**
   * 微信小程序登录获取
   * 获取session_key
   * @param
   * @return
   */
  @ResponseBody
  @PostMapping("/initWxLogin")
  @ApiImplicitParams({
      @ApiImplicitParam(name = "js_code", value = "登录时获取的code",paramType = "form", dataType = "string", required = true)
  })
  public ResultBeaninitWxLogin(@RequestParam(value = "js_code", required = true) String js_code) throws JSONException {

    //测试数据code
//    js_code = "081ZQ3f91fr9VM1HYdb91y93f91ZQ3fU";
    //微信获取session_key接口地址
    String wxLoginUrl = "https://api.weixin.qq.com/sns/jscode2session";
    //接口参数
    String param = "appid=小程序id&secret=小程序secret&js_code=" + js_code + "&grant_type=authorization_code";
    //调用获取session_key接口 请求方式get
    String jsonString = GetPostUntil.sendGet(wxLoginUrl, param);
    System.out.println(jsonString);
    //因为json字符串是大括号包围，所以用JSONObject解析
    JSONObject json = new JSONObject(jsonString);
    //json解析session_key值
    String session_key = json.getString("session_key");
    System.out.println("session_key：" + session_key);
    //返回给前端
    return ResultBean.success("session_key",session_key);
  }

  /**
   * 解密小程序用户敏感数据
   *
   * @param encryptedData 明文
   * @param iv      加密算法的初始向量
   * @param sessionKey  用户秘钥
   * @return
   */
  @ResponseBody
  @PostMapping(value = "/decodeUserInfo")
  @ApiImplicitParams({
      @ApiImplicitParam(name = "encryptedData", value = "包括敏感数据在内的完整用户信息的加密数据",paramType = "form", dataType = "string", required = true),
      @ApiImplicitParam(name = "iv", value = "加密算法的初始向量",paramType = "form", dataType = "string", required = true),
      @ApiImplicitParam(name = "sessionKey", value = "用户秘钥",paramType = "form", dataType = "string", required = true)
  })
  public ResultBean decodeUserInfo(@RequestParam(required = true, value = "encryptedData") String encryptedData,
                      @RequestParam(required = true, value = "iv") String iv,
                      @RequestParam(required = true, value = "sessionKey") String sessionKey
  ) throws UnsupportedEncodingException, InvalidAlgorithmParameterException, JSONException {
    //AESUtils微信获取手机号解密工具类
    AESUtils aes = new AESUtils();
    //调用AESUtils工具类decrypt方法解密获取json串
    byte[] resultByte = aes.decrypt(Base64.decodeBase64(encryptedData), Base64.decodeBase64(sessionKey), Base64.decodeBase64(iv));
    //判断返回参数是否为空
    if (null != resultByte && resultByte.length > 0) {
      String jsons = new String(resultByte, "UTF-8");
      System.out.println(jsons);
      JSONObject json = new JSONObject(jsons);
      //json解析phoneNumber值
      String phoneNumber = json.getString("phoneNumber");
      System.out.println("phoneNumber：" + phoneNumber);
      return ResultBean.success("手机号", phoneNumber);
    }
    return ResultBean.error(500,"session_key:失败");
  }
}

工具类代码如下

package com.df.detection.controller;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

/**
 * @Author Songzhongjin
 * @Date 2020/7/15 10:37
 * @Version 1.0
 */
public class GetPostUntil {

    /**
     * 向指定URL发送GET方法的请求
     *
     * @param url
     *      发送请求的URL
     * @param param
     *      请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return URL 所代表远程资源的响应结果
     */
    public static String sendGet(String url, String param) {
      String result = "";
      BufferedReader in = null;
      try {
        String urlNameString = url + "?" + param;
        URL realUrl = new URL(urlNameString);
        // 打开和URL之间的连接
        URLConnection connection = realUrl.openConnection();
        // 设置通用的请求属性
        connection.setRequestProperty("accept", "*/*");
        connection.setRequestProperty("connection", "Keep-Alive");
        connection.setRequestProperty("user-agent",
            "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
        // 建立实际的连接
        connection.connect();
        // 获取所有响应头字段
        Map<String, List<String>> map = connection.getHeaderFields();
        // 遍历所有的响应头字段
        for (String key : map.keySet()) {
          System.out.println(key + "--->" + map.get(key));
        }
        // 定义 BufferedReader输入流来读取URL的响应
        in = new BufferedReader(new InputStreamReader(
            connection.getInputStream()));
        String line;
        while ((line = in.readLine()) != null) {
          result += line;
        }
      } catch (Exception e) {
        System.out.println("发送GET请求出现异常！" + e);
        e.printStackTrace();
      }
      // 使用finally块来关闭输入流
      finally {
        try {
          if (in != null) {
            in.close();
          }
        } catch (Exception e2) {
          e2.printStackTrace();
        }
      }
      return result;
    }

    /**
     * 向指定 URL 发送POST方法的请求
     *
     * @param url
     *      发送请求的 URL
     * @param param
     *      请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost(String url, String param) {
      PrintWriter out = null;
      BufferedReader in = null;
      String result = "";
      try {
        URL realUrl = new URL(url);
        // 打开和URL之间的连接
        URLConnection conn = realUrl.openConnection();
        // 设置通用的请求属性
        conn.setRequestProperty("accept", "*/*");
        conn.setRequestProperty("connection", "Keep-Alive");
        conn.setRequestProperty("user-agent",
            "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
        // 发送POST请求必须设置如下两行
        conn.setDoOutput(true);
        conn.setDoInput(true);
        // 获取URLConnection对象对应的输出流
        out = new PrintWriter(conn.getOutputStream());
        // 发送请求参数
        out.print(param);
        // flush输出流的缓冲
        out.flush();
        // 定义BufferedReader输入流来读取URL的响应
        in = new BufferedReader(
            new InputStreamReader(conn.getInputStream()));
        String line;
        while ((line = in.readLine()) != null) {
          result += line;
        }
      } catch (Exception e) {
        System.out.println("发送 POST 请求出现异常！"+e);
        e.printStackTrace();
      }
      //使用finally块来关闭输出流、输入流
      finally{
        try{
          if(out!=null){
            out.close();
          }
          if(in!=null){
            in.close();
          }
        }
        catch(IOException ex){
          ex.printStackTrace();
        }
      }
      return result;
    }
  }

AESUtils工具类 解密手机号

package com.df.detection.controller;

import org.apache.tomcat.util.codec.binary.Base64;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

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 javax.xml.transform.Result;
import java.security.*;

/**
 * @Author Songzhongjin
 * @Date 2020/7/15 11:46
 * @Version 1.0
 */
public class AESUtils {

  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;
  }

}

接口返回对象ResultBean定义工具类 防止有些朋友发现没有这个类

package com.df.detection.base.entity;

import io.swagger.annotations.ApiModelProperty;

/**
 * @author Liu Yaoguang
 * @Classname aaa
 * @Description
 * @Date 2019/12/06 09:22
 */
public class ResultBean<T> {

  @ApiModelProperty(value = "返回码",dataType = "int")
  private int code;

  @ApiModelProperty(value = "返回描述信息",dataType = "string")
  private String message;

  @ApiModelProperty(value = "返回数据")
  private T data;

  @ApiModelProperty(value = "口令",dataType = "string")
  private String token;

  private ResultBean() {

  }

  public static ResultBean error(int code, String message) {
    ResultBean resultBean = new ResultBean();
    resultBean.setCode(code);
    resultBean.setMessage(message);
    return resultBean;
  }
  public static<T> ResultBean error(int code, String message,T data) {
    ResultBean resultBean = new ResultBean();
    resultBean.setCode(code);
    resultBean.setMessage(message);
    resultBean.setData(data);
    return resultBean;
  }

  public static ResultBean success(String message) {
    ResultBean resultBean = new ResultBean();
    resultBean.setCode(200);
    resultBean.setMessage(message);
    return resultBean;
  }

  public static<T> ResultBean success(String message,T data) {
    ResultBean resultBean = new ResultBean();
    resultBean.setCode(200);
    resultBean.setMessage(message);
    resultBean.setData(data);
    return resultBean;
  }
  public static ResultBean success(String message,Object data,String token) {
    ResultBean resultBean = new ResultBean();
    resultBean.setCode(200);
    resultBean.setMessage(message);
    resultBean.setData(data);
    resultBean.setToken(token);
    return resultBean;
  }

  public int getCode() {
    return code;
  }

  public void setCode(int code) {
    this.code = code;
  }

  public String getMessage() {
    return message;
  }

  public void setMessage(String message) {
    this.message = message;
  }

  public T getData() {
    return data;
  }

  public void setData(T data) {
    this.data = data;
  }

  public String getToken() {
    return token;
  }

  public void setToken(String token) {
    this.token = token;
  }
}

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