java对接微信小程序（登录&获取用户信息）

需求说明：

用户通过小程序登录，进入到平台系统，进行各功能操作；

解决方案：

首先通过对接小程序，用户通过小程序登录及授权获取用户信息，后端调用接口获取微信用户信息，进行保存到数据库，然后返回token给前端（实际在这里相当于用户的一个注册及登录），前端使用该token访问所有接口；

相关代码：

首先我们需要用到 http工具类 方便后续的接口调用：

import org.apache.http.NameValuePair;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

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

public class HttpClientUtils {
  
    final static int TIMEOUT = 1000;
 
    final static int TIMEOUT_MSEC = 5 * 1000;   
  
    public static String doPost(String url, Map<String, String> paramMap) throws IOException {
        // 创建Httpclient对象
        CloseableHttpClient httpClient = HttpClients.createDefault();
        CloseableHttpResponse response = null;
        String resultString = "";
 
        try {
            // 创建Http Post请求
            HttpPost httpPost = new HttpPost(url);
 
            // 创建参数列表
            if (paramMap != null) {
                List<NameValuePair> paramList = new ArrayList<>();
                for (Map.Entry<String, String> param : paramMap.entrySet()) {
                    paramList.add(new BasicNameValuePair(param.getKey(), param.getValue()));
                }
                // 模拟表单
                UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList);
                httpPost.setEntity(entity);
            }
 
            httpPost.setConfig(builderRequestConfig());
 
            // 执行http请求
            response = httpClient.execute(httpPost);
 
            resultString = EntityUtils.toString(response.getEntity(), "UTF-8");
        } catch (Exception e) {
            throw e;
        } finally {
            try {
                response.close();
            } catch (IOException e) {
                throw e;
            }
        }
 
        return resultString;
    }
  
    private static RequestConfig builderRequestConfig() {
        return RequestConfig.custom()
                .setConnectTimeout(TIMEOUT_MSEC)
                .setConnectionRequestTimeout(TIMEOUT_MSEC)
                .setSocketTimeout(TIMEOUT_MSEC).build();
    }
}

小程序用户表

CREATE TABLE `wechat_user` (
  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `nickname` varchar(100) DEFAULT NULL COMMENT '用户昵称',
  `avatar_url` varchar(500) DEFAULT NULL COMMENT '用户头像',
  `gender` int(11) DEFAULT NULL COMMENT '性别  0-未知、1-男性、2-女性',
  `country` varchar(100) DEFAULT NULL COMMENT '所在国家',
  `province` varchar(100) DEFAULT NULL COMMENT '省份',
  `city` varchar(100) DEFAULT NULL COMMENT '城市',
  `mobile` varchar(100) DEFAULT NULL COMMENT '手机号码',
  `open_id` varchar(100) NOT NULL COMMENT '小程序openId',
  `union_id` varchar(100) DEFAULT '' COMMENT '小程序unionId',
  `created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '插入时间',
  `updated_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
  PRIMARY KEY (`id`),
  KEY `idx_open_id` (`open_id`),
  KEY `idx_union_id` (`union_id`),
  KEY `idx_mobile` (`mobile`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8mb4 ROW_FORMAT=DYNAMIC COMMENT='小程序用户表';

dto

import io.swagger.annotations.ApiModelProperty;
import lombok.Data;

import javax.validation.constraints.NotNull;

@Data
public class WechatLoginRequest {

	//登录时获取的 code，可通过wx.login获取
    @NotNull(message = "code不能为空")
    @ApiModelProperty(value = "微信code", required = true)
    private String code;
	
	//这个入参其实里面包含了用户的信息 下面的impl层 就是解析这个json获取用户信息
    @ApiModelProperty(value = "用户非敏感字段")
    private String rawData;

    @ApiModelProperty(value = "签名")
    private String signature;

    @ApiModelProperty(value = "用户敏感字段")
    private String encryptedData;

    @ApiModelProperty(value = "解密向量")
    private String iv;
}

主要代码：

controller

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import lombok.extern.slf4j.Slf4j;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

@RestController
@RequestMapping("/wechat")
@Api(tags = {"微信小程序"}, value = "/wechat")
@Slf4j
public class LoginController {
    @Resource
    private WechatService wechatService;
    
    @ApiOperation(value = "登入接口", httpMethod = "POST")
    @PostMapping("/login")
    public ResponseResult login(@Validated @RequestBody WechatLoginRequest loginRequest) throws Exception {
        return wechatService.getUserInfoMap(loginRequest);
    }
}

mapper

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.mmc.aircraftsystemserver.api.wechet.pojo.WechatUser;
import org.apache.ibatis.annotations.Mapper;

@Mapper
public interface WechatMapper extends BaseMapper<WechatUser> {

}

impl

package com.mmc.aircraftsystemserver.api.wechet.service.impl;

import cn.hutool.core.codec.Base64;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.conditions.update.UpdateWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.lang3.StringUtils;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.security.AlgorithmParameters;
import java.security.Security;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

@Slf4j
@Service
public class WechatServiceImpl extends ServiceImpl<WechatMapper, WechatUser> implements WechatService {
	
	//小程序 appId
    @Value("${wechat.appid}")
    private String APPID;
    
    //小程序 appSecret
    @Value("${wechat.secret}")
    private String SECRET;
    
    //${wechat.grantType} = authorization_code
    @Value("${wechat.grantType}")
    private String GRANT_TYPE;
    
    // ${wechat.url} = https://api.weixin.qq.com/sns/jscode2session
    @Value("${wechat.url}")
    private String REQUEST_URL;


    public ResponseResult getUserInfoMap(WechatLoginRequest loginRequest) throws Exception {
        JSONObject sessionKeyOpenId = getSessionKeyOrOpenId(loginRequest.getCode());
        // 获取openId && sessionKey
        String openId = sessionKeyOpenId.getString("openid");
        String sessionKey = sessionKeyOpenId.getString("session_key");

        //校验签名 小程序发送的签名signature与服务器端生成的签名signature2 = sha1(rawData + sessionKey)
        String signature2 = DigestUtils.sha1Hex(loginRequest.getRawData() + sessionKey);
        if (!loginRequest.getSignature().equals(signature2)) {
            return ResponseResult.errorResult(HttpCodeEnum.FAIL, "签名校验失败");
        }
        
        WechatUser insertOrUpdateDO = buildWechatUserAuthInfoDO(loginRequest, sessionKey, openId);
 
        // 根据code保存openId和sessionKey
        JSONObject sessionObj = new JSONObject();
        sessionObj.put("openId", openId);
        sessionObj.put("sessionKey", sessionKey);

        // 根据openid查询用户
        QueryWrapper wrapper = new QueryWrapper();
        wrapper.eq("open_id",openId);
        WechatUser user = getOne(wrapper);
        if (user == null) {
            // 用户不存在，insert用户
            save(insertOrUpdateDO);
        } else {
            // 已存在，更新用户的信息
            UpdateWrapper<WechatUser> updateWrapper = new UpdateWrapper();
            updateWrapper.eq("openId",openId)
                    .set("nickname",insertOrUpdateDO.getNickname())
                    .set("avatar_url",insertOrUpdateDO.getAvatarUrl())
                    .set("gender",insertOrUpdateDO.getGender())
                    .set("country",insertOrUpdateDO.getCountry())
                    .set("province",insertOrUpdateDO.getProvince())
                    .set("city",insertOrUpdateDO.getCity())
                    .set("mobile",insertOrUpdateDO.getMobile());
           update(updateWrapper);
        }
        ResponseResult token = createToken(insertOrUpdateDO);
        return ResponseResult.okResult(token);
    }

	//调用接口
    private JSONObject getSessionKeyOrOpenId(String code) throws Exception {
        Map<String, String> requestUrlParam = new HashMap<>();
        requestUrlParam.put("appid", APPID);
        requestUrlParam.put("secret", SECRET);
        requestUrlParam.put("js_code", code);
        requestUrlParam.put("grant_type", GRANT_TYPE);
 
        // 发送post请求读取调用微信接口获取openid用户唯一标识
        String result = HttpClientUtils.doPost(REQUEST_URL, requestUrlParam);
        return JSON.parseObject(result);
    }
  
    private WechatUser buildWechatUserAuthInfoDO(WechatLoginRequest loginRequest, String sessionKey, String openId){
        WechatUser wechatUserDO = new WechatUser();
        wechatUserDO.setOpenId(openId);
 
        if (loginRequest.getRawData() != null) {
            RawDataDO rawDataDO = JSON.parseObject(loginRequest.getRawData(), RawDataDO.class);
            wechatUserDO.setNickname(rawDataDO.getNickName());
            wechatUserDO.setAvatarUrl(rawDataDO.getAvatarUrl());
            wechatUserDO.setGender(rawDataDO.getGender());
            wechatUserDO.setCity(rawDataDO.getCity());
            wechatUserDO.setCountry(rawDataDO.getCountry());
            wechatUserDO.setProvince(rawDataDO.getProvince());
        }
 
        // 解密加密信息，获取unionID
        if (loginRequest.getEncryptedData() != null){
            JSONObject encryptedData = getEncryptedData(loginRequest.getEncryptedData(), sessionKey, loginRequest.getIv());
            if (encryptedData != null){
                String unionId = encryptedData.getString("unionId");
                wechatUserDO.setUnionId(unionId);
            }
        }
 
        return wechatUserDO;
    }
  
    private JSONObject getEncryptedData(String encryptedData, String sessionkey, String iv) {
        // 被加密的数据
        byte[] dataByte = Base64.decode(encryptedData);
        // 加密秘钥
        byte[] keyByte = Base64.decode(sessionkey);
        // 偏移量
        byte[] ivByte = Base64.decode(iv);
        try {
            // 如果密钥不足16位，那么就补足.这个if中的内容很重要
            int base = 16;
            if (keyByte.length % base != 0) {
                int groups = keyByte.length / base + 1;
                byte[] temp = new byte[groups * base];
                Arrays.fill(temp, (byte) 0);
                System.arraycopy(keyByte, 0, temp, 0, keyByte.length);
                keyByte = temp;
            }
            // 初始化
            Security.addProvider(new BouncyCastleProvider());
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding", "BC");
            SecretKeySpec spec = new SecretKeySpec(keyByte, "AES");
            AlgorithmParameters parameters = AlgorithmParameters.getInstance("AES");
            parameters.init(new IvParameterSpec(ivByte));
            cipher.init(Cipher.DECRYPT_MODE, spec, parameters);// 初始化
            byte[] resultByte = cipher.doFinal(dataByte);
            if (null != resultByte && resultByte.length > 0) {
                String result = new String(resultByte, "UTF-8");
                return JSONObject.parseObject(result);
            }
        } catch (Exception e) {
            log.error("解密加密信息报错", e.getMessage());
        }
        return null;
    }

	//生成token 这里可以忽略 根据自己当前业务系统选取生成方式
    public ResponseResult createToken(WechatUser wechatUser) {
        String openid = wechatUser.getOpenId();
        String token = MD5Util.getMD5Str(openid + System.currentTimeMillis());

        String flyingSessionId = MD5Util.getMD5Str("HAHA" + wechatUser.getOpenId());
        wechatUser.getStringRedisTemplate().opsForValue().set(token, wechatUser.getNickname());

        //外部登录生成token
        String key = token + flyingSessionId;
        Map<String, String> redisData = new HashMap<>();
        redisData.put("HAHA-TOKEN", token);
        redisData.put("HAHA-SESSIONID", flyingSessionId);
        redisData.put("uid", wechatUser.getId() + "");
        redisData.put("openid", wechatUser.getOpenId());
        redisData.put("nickname", wechatUser.getNickname());
        wechatUser.getStringRedisTemplate().opsForHash().putAll(key, redisData);
        wechatUser.getStringRedisTemplate().expire(key, 86400, TimeUnit.SECONDS);
        return ResponseResult.okResult(redisData);
    }

}

注意：

微信小程序更新后：

#### 前端调用接口 参数一次性给齐 这样就可以一次调用 获取所有；文章来源地址https://www.toymoban.com/news/detail-555058.html

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