java开发微信小程序功能

　　整体流程如下：

　　- 1.获取code

　　- 2.用步骤1获取到的临时code换取用户唯一标识OpenId和会话密钥 session_key

　　- 3.获取用户手机号，用进行登录

　　请求地址：GET https://api.weixin.qq.com/sns/jscode2session?appid=APPID&secret=SECRET&js_code=JSCODE&grant_type=authorization_code

　　请求参数：

　　请求参数：

返回值：

　　开发前准备（必须）

appid：wx4c1d53****7a671

appsecret：fc9f99c08dcb2a0****eb26376c65eae

小程序代码：

login.js

// pages/login/login.wxml.jsconst app = getApp();Page({
  /**   * 页面的初始数据   */  data: {      // 判断小程序的API，回调，参数，组件等是否在当前版本可用。      canIUse: wx.canIUse('button.open-type.getPhoneNumber'),      wechat: '微信快捷登录',      isShow: false  },
  /**   * 生命周期函数--监听页面加载   */  onLoad: function (options) {      // 从缓存中取手机号      console.log("获取手机号！")      try {        var value = wx.getStorageSync('phoneNumber')        if (value) { // 说明已登录 跳转 页面          console.log("获取缓存："+value)          wx.navigateTo({            url: '../login?param=' + value          })        }else{// 未登录 显示 微信授权页面          this.setData({            isShow: true          })        }      } catch (e) {
      }      // 解决第一次获取手机号失败问题      wx.login({        success: res => {          if(res.code){            console.log("code->", res.code)          }        }      })    },
      // 0.获取手机号授权  getPhoneNumber: function(e) {    // 用户拒绝授权    if(e.detail.errMsg == "getPhoneNumber:fail user deny") {      wx.showToast({        icon: "none",        title: '请允许获取手机号，否则功能不可用！',      })      return    }  //  console.log("e->detail", e.detail)    /// 用户允许授权    // console.log("iv->", e.detail.iv); //包括敏感数据在内的完整用户信息的加密数据,需要解密    // console.log("encryptedData->", e.detail.encryptedData); //加密算法的初始向量，解密需要用到
    /// 获取手机号    // 1.获取临时登录凭证code    wx.login({      success: res => {        if(res.code){          this.code = res.code;          console.log("code->", res.code)          console.log("encryptedData->", encodeURIComponent(e.detail.encryptedData))          console.log("iv->", e.detail.iv)          this.getSessionKey(res.code, e.detail.encryptedData, e.detail.iv);        }      }    })    },  // 2.访问登录凭证校验接口获取session_key（后续改成后台实现）  getSessionKey: function(js_code, encryptedData, iv) {    // 3. 解密获取手机号    wx.request({      url: 'http://localhost:8082/wechat/appletLogin',      data: {          'encryptedData': encodeURIComponent(encryptedData),//需要进行编码          'iv': iv,          'jscode': js_code      },      method: 'POST',       header: {          'content-type': 'application/json'      }, // 设置请求的 header      success: function(data2) {          var data = data2.data          console.log(data)          if(data.resultCode == 200) {             if(data.data.user.phone==undefined){              // 获取手机号失败 跳转到 常规 用户登录页面（通过webview）              wx.navigateTo({                url: '用户登录页'              })              return            }            // 存储数据到缓存            wx.setStorage({              key:"phoneNumber",              data:data.data.user.phone            })            // 4.跳转页面          }      },      fail: function(err) {          console.log(err);          wx.showToast({            icon: "none",            title: '获取手机号失败，请重试！',          })      }    })  },  
  /**   * 生命周期函数--监听页面初次渲染完成   */  onReady: function () {
  },
  /**   * 生命周期函数--监听页面显示   */  onShow: function () {
  },
  /**   * 生命周期函数--监听页面隐藏   */  onHide: function () {
  },
  /**   * 生命周期函数--监听页面卸载   */  onUnload: function () {
  },
  /**   * 页面相关事件处理函数--监听用户下拉动作   */  onPullDownRefresh: function () {
  },
  /**   * 页面上拉触底事件的处理函数   */  onReachBottom: function () {
  },
  /**   * 用户点击右上角分享   */  onShareAppMessage: function () {
  }})

login.json

{  "usingComponents": {}}

login.wxml

<!--pages/login.wxml--><view class="modal-mask" catchtouchmove="preventTouchMove" wx:if="{{isShow}}"></view>  <view class="modal-dialog" wx:if="{{isShow}}">  <view class="modal-content">    <view><image src='../images/show.png' class='show'></image></view>    <!-- <view>绑定手机号</view>    <view>请先绑定手机号在进行此操作</view>   -->    <button class="show" type="primary" lang="zh_CN"    open-type='getPhoneNumber' bindgetphonenumber="getPhoneNumber" >      微信用户一键登录    </button>  </view></view>

login.wxss

/* pages/login/login.wxml.wxss */.show{  display: block;  border-radius: 8rpx;  margin: 20rpx 20rpx 20rpx 20rpx;  font-size: 35rpx;}
.container{  position: fixed;  /*关键属性，设置为fixed*/  display: flex;  flex-direction: column;  width: 100%;  height: 100%;}

后端代码

WxLoginController.java

@RestController@RequestMapping("/wechat")public class WxLoginController {
    private Logger logger = LoggerFactory.getLogger(WxLoginController.class);        @Autowired    UserDao userDao;        @Value("${wechat.appid}")    private String appid;    @Value("${wechat.appsecret}")    private String appsecret;        private Map<String, Object> userMap = new HashMap<>();        @GetMapping("/appletLogin")    public ResultBean appletLogin(String encryptedData, String iv, String jscode) {        System.out.println(encryptedData);        ResultBean resultBean = new ResultBean();        // jscode        if (StringUtils.isEmpty(jscode)) {            resultBean.setResultCode(-10001);            resultBean.setResultMessage("鉴权失败！");            return resultBean;        }        // sign        if (StringUtils.isEmpty(encryptedData)) {            resultBean.setResultCode(-10001);            resultBean.setResultMessage("鉴权失败！");            return resultBean;        }        if(StringUtils.isBlank(iv)) {            resultBean.setResultCode(-10002);            resultBean.setResultMessage("鉴权失败！");            return resultBean;        }
        // 创建Httpclient对象        CloseableHttpClient httpclient = HttpClients.createDefault();        String resultString = "";        CloseableHttpResponse response = null;        String url =WxContants.url.replace(WxContants.APPID, appid).                replace(WxContants.SECRET, appsecret).replace(WxContants.JSCODE, jscode);
        try {            // 创建uri            URIBuilder builder = new URIBuilder(url);            URI uri = builder.build();
            // 创建http GET请求            HttpGet httpGet = new HttpGet(uri);
            // 执行请求            response = httpclient.execute(httpGet);            // 判断返回状态是否为200            if (response.getStatusLine().getStatusCode() == 200) {                resultString = EntityUtils.toString(response.getEntity(), "UTF-8");            }        } catch (Exception e) {            e.printStackTrace();        }
        // 解析json        JSONObject jsonObject = (JSONObject) JSONObject.parse(resultString);        String session_key = jsonObject.getString("session_key");        String openid = jsonObject.getString("openid");
        System.out.println("session_key："+session_key + ",openid："+openid);        if (StringUtils.isEmpty(session_key)) {            resultBean.setResultCode(-10003);            resultBean.setResultMessage("获取sessionkey失败！");            return resultBean;        }
        // 解码        try {            encryptedData = URLDecoder.decode(encryptedData,"UTF-8");        } catch (UnsupportedEncodingException e) {            logger.error("encryptedData，decode失败！", e);            resultBean.setResultCode(-10003);            resultBean.setResultMessage("encryptedData，decode失败！");            return resultBean;        }        String decryptData = WechatDecryptDataUtil.decryptData(encryptedData, session_key, iv);        JSONObject userInfo = JSONObject.parseObject(decryptData);        // 存入redis+数据库，判断是否存在redis中，存在直接从redis返回        // 本地使用Map模拟        if (!userMap.containsKey(openid)) {            // 判断用户是否存在系统中            String phoneNumber = userInfo.getString("phoneNumber");            User user = userDao.findByPhone(phoneNumber);            if (user == null) {                resultBean.setResultCode(200);                resultBean.setResultMessage("此用户不存在，请先注册！");                return resultBean;            }            user.setOpenId(openid);            userDao.save(user);            userMap.put(openid, user);        }        User user = (User) userMap.get(openid);        resultBean.setResultCode(200);        resultBean.setResultMessage("成功！");        resultBean.setData(user);        return resultBean;    }}

UserDao.java

public interface UserDao extends JpaRepository<User, Long> {
    User findByPhone(String phone);
    User findByOpenId(String openId);}

User.java：

@Entity@Table(name = "user")public class User {
    @Id    @GeneratedValue(strategy = GenerationType.IDENTITY)    private Long id;    private String openId;    private String phone;
    public Long getId() {        return id;    }
    public void setId(Long id) {        this.id = id;    }
    public String getOpenId() {        return openId;    }
    public void setOpenId(String openId) {        this.openId = openId;    }
    public String getPhone() {        return phone;    }
    public void setPhone(String phone) {        this.phone = phone;    }}

WechatDecryptDataUtil.java

public class WechatDecryptDataUtil {    private static Logger logger = LogManager.getLogger(WechatDecryptDataUtil.class);
    public static void main(String[] args) {        String result = decryptData(                "BLY05rL1qLzGdqn+m4s4KfnM9CbMCm2sTZmgIcUJUpoOVeZkKKYh06ATVm2BgX8HUsH1a93811fhwr70MTh2Pk2qw9rPBzvos3husUJdVfaZgBk3Afp6wNFS0/kcoyt+7q2eMrIHMe6wkc4J0hgbbkxdUwZag/pyKXwe4pUzSQfta7dfBHy3DLu+REvwHiDNfvI3KJbZ0l8/9vRjfSmT4Q==",                "C9Z59YjFkCDT8+9NQ3OxcA==",                "oOWTpbZ80evG/GQqRdUu3w=="        );        System.out.println("result = " + result);    }
    public synchronized static String decryptData(String encryptDataB64, String sessionKeyB64, String ivB64) {        String res = null;        try {            res = new String(                    decryptOfDiyIV(                            Base64.decode(encryptDataB64),                            Base64.decode(sessionKeyB64),                            Base64.decode(ivB64)                    )            );        } catch (Exception e) {            logger.error("encryptDataB64:"+encryptDataB64+"\n"+"sessionKeyB64:"+sessionKeyB64+"\n"+"ivB64:"+ivB64);        }
        return res;    }
    private static final String KEY_ALGORITHM = "AES";    private static final String ALGORITHM_STR = "AES/CBC/PKCS7Padding";    private static Key key;    private static Cipher cipher;
    private static void init(byte[] keyBytes) {        // 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 (keyBytes.length % base != 0) {            int groups = keyBytes.length / base + (keyBytes.length % base != 0 ? 1 : 0);            byte[] temp = new byte[groups * base];            Arrays.fill(temp, (byte) 0);            System.arraycopy(keyBytes, 0, temp, 0, keyBytes.length);            keyBytes = temp;        }        // 初始化        Security.addProvider(new BouncyCastleProvider());        // 转化成JAVA的密钥格式        key = new SecretKeySpec(keyBytes, KEY_ALGORITHM);        try {            // 初始化cipher            cipher = Cipher.getInstance(ALGORITHM_STR, "BC");        } catch (Exception e) {            e.printStackTrace();        }    }
    /**     * 解密方法     *     * @param encryptedData 要解密的字符串     * @param keyBytes      解密密钥     * @param ivs           自定义对称解密算法初始向量 iv     * @return 解密后的字节数组     */    private static byte[] decryptOfDiyIV(byte[] encryptedData, byte[] keyBytes, byte[] ivs) {        byte[] encryptedText = null;        init(keyBytes);        try {            cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(ivs));            encryptedText = cipher.doFinal(encryptedData);        } catch (Exception e) {            e.printStackTrace();        }        return encryptedText;    }
}

WxContants.java

public interface WxContants {
    String APPID = "APPID";    String SECRET = "SECRET";    String JSCODE = "JSCODE";    String TRADE_TYPE = "JSAPI";    String url = "https://api.weixin.qq.com/sns/jscode2session?appid=APPID&secret=SECRET&js_code=JSCODE&grant_type=authorization_code";}

java开发微信小程序功能

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java开发微信小程序功能

延伸阅读

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