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基于redis如何实现小程序登录

小编这次要给大家分享的是基于redis如何实现小程序登录，文章内容丰富，感兴趣的小伙伴可以来了解一下，希望大家阅读完这篇文章之后能够有所收获。

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这张图是小程序的登录流程解析:

基于redis如何实现小程序登录

小程序登陆授权流程:

在小程序端调用wx.login()获取code,由于我是做后端开发的这边不做赘述,直接贴上代码了.有兴趣的直接去官方文档看下,链接放这里: wx.login()

wx.login({
 success (res) {
 if (res.code) {
 //发起网络请求
 wx.request({
 url: 'https://test.com/onLogin',
 data: {
 code: res.code
 }
 })
 } else {
 console.log('登录失败！' + res.errMsg)
 }
 }
})

小程序前端登录后会获取code,调用自己的开发者服务接口,调用个get请求:

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

需要得四个参数:
appid：小程序appid
secret： 小程序密钥
js_code： 刚才获取的code
grant_type：‘authorization_code' //这个是固定的

如果不出意外的话,微信接口服务器会返回四个参数:

基于redis如何实现小程序登录

下面附上我的代码:

@AuthIgnore
 @RequestMapping("/login")
 @ResponseBody
 public ResponseBean openId(@RequestParam(value = "code", required = true) String code,
  @RequestParam(value = "avatarUrl") String avatarUrl,
  @RequestParam(value = "city") String city,
  @RequestParam(value = "country") String country,
  @RequestParam(value = "gender") String gender,
  @RequestParam(value = "language") String language,
  @RequestParam(value = "nickName") String nickName,
  @RequestParam(value = "province") String province,
  HttpServletRequest request) { // 小程序端获取的CODE
 ResponseBean responseBean = new ResponseBean();
 try {
 boolean check = (StringUtils.isEmpty(code)) ? true : false;
 if (check) {
 responseBean = new ResponseBean(false, UnicomResponseEnums.NO_CODE);
 return responseBean;
 }
 //将获取的用户数据存入数据库;
 Map msgs = new HashMap<>();
 msgs.put("appid", appId);
 msgs.put("secret", secret);
 msgs.put("js_code", code);
 msgs.put("grant_type", "authorization_code");
 // java的网络请求，返回字符串
 String data = HttpUtils.get(msgs, Constants.JSCODE2SESSION);
 logger.info("======> " + data);
 String openId = JSONObject.parseObject(data).getString("openid");
 String session_key = JSONObject.parseObject(data).getString("session_key");
 String unionid = JSONObject.parseObject(data).getString("unionid");
 String errcode = JSONObject.parseObject(data).getString("errcode");
 String errmsg = JSONObject.parseObject(data).getString("errmsg");

 JSONObject json = new JSONObject();
 int userId = -1;

 if (!StringUtils.isBlank(openId)) {
 Users user = userService.selectUserByOpenId(openId);
 if (user == null) {
  //新建一个用户信息
  Users newUser = new Users();
  newUser.setOpenid(openId);
  newUser.setArea(city);
  newUser.setSex(Integer.parseInt(gender));
  newUser.setNickName(nickName);
  newUser.setCreateTime(new Date());
  newUser.setStatus(0);//初始
  if (!StringUtils.isBlank(unionid)) {
  newUser.setUnionid(unionid);
  }
  userService.instert(newUser);
  userId = newUser.getId();
 } else {
  userId = user.getId();
 }
 json.put("userId", userId);
 }
 if (!StringUtils.isBlank(session_key) && !StringUtils.isBlank(openId)) {
 //这段可不用redis存,直接返回session_key也可以
 String userAgent = request.getHeader("user-agent");
 String sessionid = tokenService.generateToken(userAgent, session_key);
 //将session_key存入redis
 redisUtil.setex(sessionid, session_key + "###" + userId, Constants.SESSION_KEY_EX);
 json.put("token", sessionid);

 responseBean = new ResponseBean(true, json);
 } else {
 responseBean = new ResponseBean<>(false, null, errmsg);
 }
 return responseBean;
 } catch (Exception e) {
 e.printStackTrace();
 responseBean = new ResponseBean(false, UnicomResponseEnums.JSCODE2SESSION_ERRO);
 return responseBean;
 }
 }

解析:

这边我的登录获取的session_key出于安全性考虑没有直接在前端传输,而是存到了redis里面给到前端session_key的token传输,
而且session_key的销毁时间是20分钟,时间内可以重复获取用户数据.
如果只是简单使用或者对安全性要求不严的话可以直接传session_key到前端保存.

session_key的作用:

校验用户信息(wx.getUserInfo(OBJECT)返回的signature);
解密(wx.getUserInfo(OBJECT)返回的encryptedData);

按照官方的说法，wx.checksession是用来检查 wx.login(OBJECT) 的时效性，判断登录是否过期;
疑惑的是（openid，unionid ）都是用户唯一标识，不会因为wx.login(OBJECT)的过期而改变，所以要是没有使用wx.getUserInfo(OBJECT)获得的用户信息，确实没必要使用wx.checksession()来检查wx.login(OBJECT) 是否过期；
如果使用了wx.getUserInfo(OBJECT)获得的用户信息，还是有必要使用wx.checksession()来检查wx.login(OBJECT) 是否过期的，因为用户有可能修改了头像、昵称、城市，省份等信息，可以通过检查wx.login(OBJECT) 是否过期来更新着些信息；

小程序的登录状态维护本质就是维护session_key的时效性

这边附上我的HttpUtils工具代码,如果只要用get的话可以复制部分:

如果是直

/**
 * HttpUtils工具类
 *
 * @author
 */
public class HttpUtils {
 /**
 * 请求方式：post
 */
 public static String POST = "post";
 /**
 * 编码格式：utf-8
 */
 private static final String CHARSET_UTF_8 = "UTF-8";
 /**
 * 报文头部json
 */
 private static final String APPLICATION_JSON = "application/json";
 /**
 * 请求超时时间
 */
 private static final int CONNECT_TIMEOUT = 60 * 1000;
 /**
 * 传输超时时间
 */
 private static final int SO_TIMEOUT = 60 * 1000;
 /**
 * 日志
 */
 private static final Logger logger = LoggerFactory.getLogger(HttpUtils.class);
 /**
 * @param protocol
 * @param url
 * @param paraMap
 * @return
 * @throws Exception
 */
 public static String doPost(String protocol, String url,
  Map paraMap) throws Exception {
 CloseableHttpClient httpClient = null;
 CloseableHttpResponse resp = null;
 String rtnValue = null;
 try {
 if (protocol.equals("http")) {
 httpClient = HttpClients.createDefault();
 } else {
 // 获取https安全客户端
 httpClient = HttpUtils.getHttpsClient();
 }
 HttpPost httpPost = new HttpPost(url);
 List list = msgs2valuePairs(paraMap);
// List list = new ArrayList();
// if (null != paraMap &¶Map.size() > 0) {
// for (Entry entry : paraMap.entrySet()) {
//  list.add(new BasicNameValuePair(entry.getKey(), entry
//  .getValue().toString()));
// }
// }
 RequestConfig requestConfig = RequestConfig.custom()
  .setSocketTimeout(SO_TIMEOUT)
  .setConnectTimeout(CONNECT_TIMEOUT).build();// 设置请求和传输超时时间
 httpPost.setConfig(requestConfig);
 httpPost.setEntity(new UrlEncodedFormEntity(list, CHARSET_UTF_8));
 resp = httpClient.execute(httpPost);
 rtnValue = EntityUtils.toString(resp.getEntity(), CHARSET_UTF_8);
 } catch (Exception e) {
 logger.error(e.getMessage());
 throw e;
 } finally {
 if (null != resp) {
 resp.close();
 }
 if (null != httpClient) {
 httpClient.close();
 }
 }
 return rtnValue;
 }
 /**
 * 获取https，单向验证
 *
 * @return
 * @throws Exception
 */
 public static CloseableHttpClient getHttpsClient() throws Exception {
 try {
 TrustManager[] trustManagers = new TrustManager[]{new X509TrustManager() {
 public void checkClientTrusted(
  X509Certificate[] paramArrayOfX509Certificate,
  String paramString) throws CertificateException {
 }
 public void checkServerTrusted(
  X509Certificate[] paramArrayOfX509Certificate,
  String paramString) throws CertificateException {
 }
 public X509Certificate[] getAcceptedIssuers() {
  return null;
 }
 }};
 SSLContext sslContext = SSLContext
  .getInstance(SSLConnectionSocketFactory.TLS);
 sslContext.init(new KeyManager[0], trustManagers,
  new SecureRandom());
 SSLContext.setDefault(sslContext);
 sslContext.init(null, trustManagers, null);
 SSLConnectionSocketFactory connectionSocketFactory = new SSLConnectionSocketFactory(
  sslContext,
  SSLConnectionSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
 HttpClientBuilder clientBuilder = HttpClients.custom()
  .setSSLSocketFactory(connectionSocketFactory);
 clientBuilder.setRedirectStrategy(new LaxRedirectStrategy());
 CloseableHttpClient httpClient = clientBuilder.build();
 return httpClient;
 } catch (Exception e) {
 throw new Exception("http client 远程连接失败", e);
 }
 }
 /**
 * post请求
 *
 * @param msgs
 * @param url
 * @return
 * @throws ClientProtocolException
 * @throws UnknownHostException
 * @throws IOException
 */
 public static String post(Map msgs, String url)
 throws ClientProtocolException, UnknownHostException, IOException {
 CloseableHttpClient httpClient = HttpClients.createDefault();
 try {
 HttpPost request = new HttpPost(url);
 List valuePairs = msgs2valuePairs(msgs);
// List valuePairs = new ArrayList();
// if (null != msgs) {
// for (Entry entry : msgs.entrySet()) {
//  if (entry.getValue() != null) {
//  valuePairs.add(new BasicNameValuePair(entry.getKey(),
//  entry.getValue().toString()));
//  }
// }
// }
 request.setEntity(new UrlEncodedFormEntity(valuePairs, CHARSET_UTF_8));
 CloseableHttpResponse resp = httpClient.execute(request);
 return EntityUtils.toString(resp.getEntity(), CHARSET_UTF_8);
 } finally {
 httpClient.close();
 }
 }
 /**
 * post请求
 *
 * @param msgs
 * @param url
 * @return
 * @throws ClientProtocolException
 * @throws UnknownHostException
 * @throws IOException
 */
 public static byte[] postGetByte(Map msgs, String url)
 throws ClientProtocolException, UnknownHostException, IOException {
 CloseableHttpClient httpClient = HttpClients.createDefault();
 InputStream inputStream = null;
 byte[] data = null;
 try {
 HttpPost request = new HttpPost(url);
 List valuePairs = msgs2valuePairs(msgs);
// List valuePairs = new ArrayList();
// if (null != msgs) {
// for (Entry entry : msgs.entrySet()) {
//  if (entry.getValue() != null) {
//  valuePairs.add(new BasicNameValuePair(entry.getKey(),
//  entry.getValue().toString()));
//  }
// }
// }
 request.setEntity(new UrlEncodedFormEntity(valuePairs, CHARSET_UTF_8));
 CloseableHttpResponse response = httpClient.execute(request);
 try {
 // 获取相应实体
 HttpEntity entity = response.getEntity();
 if (entity != null) {
  inputStream = entity.getContent();
  data = readInputStream(inputStream);
 }
 return data;
 } catch (Exception e) {
 e.printStackTrace();
 } finally {
 httpClient.close();
 return null;
 }
 } finally {
 httpClient.close();
 }
 }
 /** 将流 保存为数据数组
 * @param inStream
 * @return
 * @throws Exception
 */
 public static byte[] readInputStream(InputStream inStream) throws Exception {
 ByteArrayOutputStream outStream = new ByteArrayOutputStream();
 // 创建一个Buffer字符串
 byte[] buffer = new byte[1024];
 // 每次读取的字符串长度，如果为-1，代表全部读取完毕
 int len = 0;
 // 使用一个输入流从buffer里把数据读取出来
 while ((len = inStream.read(buffer)) != -1) {
 // 用输出流往buffer里写入数据，中间参数代表从哪个位置开始读，len代表读取的长度
 outStream.write(buffer, 0, len);
 }
 // 关闭输入流
 inStream.close();
 // 把outStream里的数据写入内存
 return outStream.toByteArray();
 }
 /**
 * get请求
 *
 * @param msgs
 * @param url
 * @return
 * @throws ClientProtocolException
 * @throws UnknownHostException
 * @throws IOException
 */
 public static String get(Map msgs, String url)
 throws ClientProtocolException, UnknownHostException, IOException {
 CloseableHttpClient httpClient = HttpClients.createDefault();
 try {
 List valuePairs = msgs2valuePairs(msgs);
// List valuePairs = new ArrayList();
// if (null != msgs) {
// for (Entry entry : msgs.entrySet()) {
//  if (entry.getValue() != null) {
//  valuePairs.add(new BasicNameValuePair(entry.getKey(),
//  entry.getValue().toString()));
//  }
// }
// }
 // EntityUtils.toString(new UrlEncodedFormEntity(valuePairs),
 // CHARSET);
 url = url + "?" + URLEncodedUtils.format(valuePairs, CHARSET_UTF_8);
 HttpGet request = new HttpGet(url);
 CloseableHttpResponse resp = httpClient.execute(request);
 return EntityUtils.toString(resp.getEntity(), CHARSET_UTF_8);
 } finally {
 httpClient.close();
 }
 }
 public static  T post(Map msgs, String url,
  Class clazz) throws ClientProtocolException,
 UnknownHostException, IOException {
 String json = HttpUtils.post(msgs, url);
 T t = JSON.parseObject(json, clazz);
 return t;
 }
 public static  T get(Map msgs, String url, Class clazz)
 throws ClientProtocolException, UnknownHostException, IOException {
 String json = HttpUtils.get(msgs, url);
 T t = JSON.parseObject(json, clazz);
 return t;
 }
 public static String postWithJson(Map msgs, String url)
 throws ClientProtocolException, IOException {
 CloseableHttpClient httpClient = HttpClients.createDefault();
 try {
 String jsonParam = JSON.toJSONString(msgs);
 HttpPost post = new HttpPost(url);
 post.setHeader("Content-Type", APPLICATION_JSON);
 post.setEntity(new StringEntity(jsonParam, CHARSET_UTF_8));
 CloseableHttpResponse response = httpClient.execute(post);
 return new String(EntityUtils.toString(response.getEntity()).getBytes("iso8859-1"), CHARSET_UTF_8);
 } finally {
 httpClient.close();
 }
 }
 public static  T postWithJson(Map msgs, String url, Class clazz) throws ClientProtocolException,
 UnknownHostException, IOException {
 String json = HttpUtils.postWithJson(msgs, url);
 T t = JSON.parseObject(json, clazz);
 return t;
 }
 public static List msgs2valuePairs(Map msgs) {
 List valuePairs = new ArrayList();
 if (null != msgs) {
 for (Entry entry : msgs.entrySet()) {
 if (entry.getValue() != null) {
  valuePairs.add(new BasicNameValuePair(entry.getKey(),
  entry.getValue().toString()));
 }
 }
 }
 return valuePairs;
 }
}

接传session_key到前端的,下面的可以不用看了.
如果是redis存的sesssion_key的token的话,这边附上登陆的时候的token转换为session_key.

自定义拦截器注解:

import java.lang.annotation.*;
@Target({ElementType.METHOD,ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface AuthIgnore {
}

拦截器部分代码:

 @Override
 public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
 AuthIgnore annotation;
 if(handler instanceof HandlerMethod) {
 annotation = ((HandlerMethod) handler).getMethodAnnotation(AuthIgnore.class);
 }else{
 return true;
 }
 //如果有@AuthIgnore注解，则不验证token
 if(annotation != null){
 return true;
 }
// //获取微信access_token;
// if(!redisUtil.exists(Constants.ACCESS_TOKEN)){
// Map msgs = new HashMap<>();
// msgs.put("appid",appId);
// msgs.put("secret",secret);
// msgs.put("grant_type","client_credential");
// String data = HttpUtils.get(msgs,Constants.GETACCESSTOKEN); // java的网络请求，返回字符串
// String errcode= JSONObject.parseObject(data).getString("errcode");
// String errmsg= JSONObject.parseObject(data).getString("errmsg");
// if(StringUtils.isBlank(errcode)){
// //存储access_token
// String access_token= JSONObject.parseObject(data).getString("access_token");
// long expires_in=Long.parseLong(JSONObject.parseObject(data).getString("expires_in"));
// redisUtil.setex("ACCESS_TOKEN",access_token, expires_in);
// }else{
// //异常返回数据拦截，返回json数据
// response.setCharacterEncoding("UTF-8");
// response.setContentType("application/json; charset=utf-8");
// PrintWriter out = response.getWriter();
// ResponseBean responseBean=new ResponseBean<>(false,null, errmsg);
// out = response.getWriter();
// out.append(JSON.toJSON(responseBean).toString());
// return false;
// }
// }
 //获取用户凭证
 String token = request.getHeader(Constants.USER_TOKEN);
// if(StringUtils.isBlank(token)){
// token = request.getParameter(Constants.USER_TOKEN);
// }
// if(StringUtils.isBlank(token)){
// Object obj = request.getAttribute(Constants.USER_TOKEN);
// if(null!=obj){
// token=obj.toString();
// }
// }
// //token凭证为空
// if(StringUtils.isBlank(token)){
// //token不存在拦截，返回json数据
// response.setCharacterEncoding("UTF-8");
// response.setContentType("application/json; charset=utf-8");
// PrintWriter out = response.getWriter();
// try{
// ResponseBean responseBean=new ResponseBean<>(false,null, UnicomResponseEnums.TOKEN_EMPTY);
// out = response.getWriter();
// out.append(JSON.toJSON(responseBean).toString());
// return false;
// }
// catch (Exception e) {
// e.printStackTrace();
// response.sendError(500);
// return false;
// }
// }
 if(token==null||!redisUtil.exists(token)){
 //用户未登录，返回json数据
 response.setCharacterEncoding("UTF-8");
 response.setContentType("application/json; charset=utf-8");
 PrintWriter out = response.getWriter();
 try{
 ResponseBean responseBean=new ResponseBean<>(false,null, UnicomResponseEnums.DIS_LOGIN);
 out = response.getWriter();
 out.append(JSON.toJSON(responseBean).toString());
 return false;
 }
 catch (Exception e) {
 e.printStackTrace();
 response.sendError(500);
 return false;
 }
 }
 tokenManager.refreshUserToken(token);
 return true;
 }
}
过滤器配置:
@Configuration
public class InterceptorConfig extends WebMvcConfigurerAdapter {
 @Override
 public void addInterceptors(InterceptorRegistry registry) {
 registry.addInterceptor(authorizationInterceptor())
 .addPathPatterns("/**")// 拦截所有请求，通过判断是否有 @AuthIgnore注解 决定是否需要登录
 .excludePathPatterns("/user/login");//排除登录
 }
 @Bean
 public AuthorizationInterceptor authorizationInterceptor() {
 return new AuthorizationInterceptor();
 }
}
token管理:
@Service
public class TokenManager {
 @Resource
 private RedisUtil redisUtil;
 //生成token(格式为token:设备-加密的用户名-时间-六位随机数)
 public String generateToken(String userAgentStr, String username) {
 StringBuilder token = new StringBuilder("token:");
 //设备
 UserAgent userAgent = UserAgent.parseUserAgentString(userAgentStr);
 if (userAgent.getOperatingSystem().isMobileDevice()) {
 token.append("MOBILE-");
 } else {
 token.append("PC-");
 }
 //加密的用户名
 token.append(MD5Utils.MD5Encode(username) + "-");
 //时间
 token.append(new SimpleDateFormat("yyyyMMddHHmmssSSS").format(new Date()) + "-");
 //六位随机字符串
 token.append(UUID.randomUUID().toString());
 System.out.println("token-->" + token.toString());
 return token.toString();
 }
 /**
 * 登录用户，创建token
 *
 * @param token
 */
 //把token存到redis中
 public void save(String token, Users user) {
 if (token.startsWith("token:PC")) {
 redisUtil.setex(token,JSON.toJSONString(user), Constants.TOKEN_EX);
 } else {
 redisUtil.setex(token,JSON.toJSONString(user), Constants.TOKEN_EX);
 }
 }
 /**
 * 刷新用户
 *
 * @param token
 */
 public void refreshUserToken(String token) {
 if (redisUtil.exists(token)) {
 String value=redisUtil.get(token);
 redisUtil.setex(token, value, Constants.TOKEN_EX);
 }
 }
 /**
 * 用户退出登陆
 *
 * @param token
 */
 public void loginOut(String token) {
 redisUtil.remove(token);
 }
 /**
 * 获取用户信息
 *
 * @param token
 * @return
 */
 public Users getUserInfoByToken(String token) {
 if (redisUtil.exists(token)) {
 String jsonString = redisUtil.get(token);
 Users user =JSONObject.parseObject(jsonString, Users.class);
 return user;
 }
 return null;
 }
}
redis工具类:
@Component
public class RedisUtil {
 @Resource
 private RedisTemplate redisTemplate;
 public void set(String key, String value) {
 ValueOperations valueOperations = redisTemplate.opsForValue();
 valueOperations.set(key, value);
 }
 public void setex(String key, String value, long seconds) {
 ValueOperations valueOperations = redisTemplate.opsForValue();
 valueOperations.set(key, value, seconds,TimeUnit.SECONDS);
 }
 public Boolean exists(String key) {
 return redisTemplate.hasKey(key);
 }
 public void remove(String key) {
 redisTemplate.delete(key);
 }
 public String get(String key) {
 ValueOperations valueOperations = redisTemplate.opsForValue();
 return valueOperations.get(key);
 }
}
最后redis要实现序列化,序列化最终的目的是为了对象可以跨平台存储，和进行网络传输。而我们进行跨平台存储和网络传输的方式就是IO，而我们的IO支持的数据格式就是字节数组。本质上存储和网络传输 都需要经过 把一个对象状态保存成一种跨平台识别的字节格式，然后其他的平台才可以通过字节信息解析还原对象信息。
@Configuration
@ConditionalOnClass(RedisOperations.class)
@EnableConfigurationProperties(RedisProperties.class)
public class RedisConfig {
 @Bean
 @ConditionalOnMissingBean(name = "redisTemplate")
 public RedisTemplate redisTemplate(
 RedisConnectionFactory redisConnectionFactory) {
 RedisTemplate template = new RedisTemplate<>();
 //使用fastjson序列化
 FastJsonRedisSerializer fastJsonRedisSerializer = new FastJsonRedisSerializer(Object.class);
 // value值的序列化采用fastJsonRedisSerializer
 template.setValueSerializer(fastJsonRedisSerializer);
 template.setHashValueSerializer(fastJsonRedisSerializer);
 // key的序列化采用StringRedisSerializer
 template.setKeySerializer(new StringRedisSerializer());
 template.setHashKeySerializer(new StringRedisSerializer());
 template.setConnectionFactory(redisConnectionFactory);
 return template;
 }
 @Bean
 @ConditionalOnMissingBean(StringRedisTemplate.class)
 public StringRedisTemplate stringRedisTemplate(
 RedisConnectionFactory redisConnectionFactory) {
 StringRedisTemplate template = new StringRedisTemplate();
 template.setConnectionFactory(redisConnectionFactory);
 return template;
 }
}
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