java后端实现微信登录获取code，后端获取code、openid以及用户信息数据

2024-07-13 00:15| 来源: 网络整理| 查看: 265

业务描述：前端仅访问一下接口，后端java获取code以及用户的数据（重点：进行重定向,response.sendRedirect(url)）;

网上大部分是前端获取code传给后端进行操作，结合自己的场景，后端直接获取code进行数据的获取重点提示（注意看这里）：如果项目是前后端分离项目，不可以使用重定向，前端会出现跨域问题解决方式：获取前端的访问地址，向前端返回微信获取code的地址，前端进行访问，获取code，再传到后端，进行业务的操作

/** * description 微信授权登录接口 * param [] * return common.enums.ResultVO * author * createTime 2021/11/22 16:28 **/ @PostMapping("WxLogin") public ResultVO WxLogin(HttpServletRequest request, @RequestBody String param) throws Exception { String orgCode = request.getHeader("orgCode"); Organization organization = organizationService.findByOrgCode(orgCode); String appid = ""; String appsecret = ""; if (StringUtils.isNotBlank(organization.getAppid()) && StringUtils.isNotBlank(organization.getAppsecret())) { appid = organization.getAppid(); appsecret = organization.getAppsecret(); } String url = JSON.parseObject(param).getString("URL"); return new ResultVO(ResultCode.SUCCESS, WeChatLoginUtil.getUserUathUrl(appid, url)); } 1.搭建微信登录工具类： package util; import java.io.UnsupportedEncodingException; import java.net.URLEncoder; /** * 微信登录工具类 * * @description: * @projectName:alumni * @see:util * @author:lgb * @createTime:2021/8/27 17:02 * @version:1.0 */ public class WeChatLoginUtil { final Boolean flag = false; /** * description 1.获取用户的临时code * param [appid, redirectUrl] * return java.lang.String * authorlgb * createTime 2021/8/27 17:30 **/ public static String getUserUathUrl(String appid, String redirectUrl) throws UnsupportedEncodingException { StringBuffer getcodeUrl = new StringBuffer() .append("https://open.weixin.qq.com/connect/oauth2/authorize") .append("?appid=" + appid) .append("&redirect_uri=" + URLEncoder.encode(redirectUrl, "utf-8")) .append("&response_type=code") .append("&scope=snsapi_userinfo") .append("&state=" + System.currentTimeMillis()) .append("#wechat_redirect"); return getcodeUrl.toString(); } /** * description 2.获取用户的openid和access_token * param [appid, appSecret, code] * return java.lang.String * author * createTime 2021/8/27 17:30 **/ public static String getBaseAccessTokenUrl(String appid, String appSecret, String code) throws UnsupportedEncodingException { StringBuffer baseAccessTokenUrl = new StringBuffer() .append("https://api.weixin.qq.com/sns/oauth2/access_token") .append("?appid=" + appid) .append("&secret=" + appSecret) .append("&code=" + code) .append("&grant_type=authorization_code"); return baseAccessTokenUrl.toString(); } /** * description 3.根据openid 获取用户的信息 * param [accessToken, openid] * return java.lang.String * author * createTime 2021/8/27 17:31 **/ public static String getBaseUserInfoUrl(String accessToken, String openid) { StringBuffer baseUserInfoUrl = new StringBuffer() .append("https://api.weixin.qq.com/sns/userinfo") .append("?access_token=" + accessToken) .append("&openid=" + openid) .append("&lang=zh_CN"); return baseUserInfoUrl.toString(); } /** * description 4检验授权凭证（access_token）是否有效 * param [openid, accessToken] * return java.lang.String * author * createTime 2021/11/29 10:16 **/ public static String checkAccessToken(String openid, String accessToken) { StringBuffer stringBuffer = new StringBuffer().append(" https://api.weixin.qq.com/sns/auth") .append("?access_token=" + accessToken) .append("&openid=" + openid); return stringBuffer.toString(); } /** * description 微信小程序登录，通过code获取session_key和openid * param [appid, secret, code] * return java.lang.String * author * createTime 2021/8/30 10:15 **/ public static String getCode2Session(String appid, String secret, String code) { StringBuffer code2Session = new StringBuffer() .append("ttps://api.weixin.qq.com/sns/jscode2session") .append("?appid=" + appid) .append("&secret=" + secret) .append("&js_code=" + code) .append("&grant_type=authorization_code"); return code2Session.toString(); } } 2.构建微信配置类 package mobile.config; import lombok.Data; import org.springframework.beans.factory.InitializingBean; import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Component; /** * @description: 微信相关信息配置 * @projectName:alumni * @see:mobile.config * @author: * @createTime:2021/8/30 9:31 * @version:1.0 */ @Component @Data public class WxOpenLoginConfig implements InitializingBean { //微信登录的appid,应用唯一标识 @Value("${wx.open.app_id}") private String appId; // 微信登录的应用密钥AppSecret @Value("${wx.open.app_secret}") private String appSecret; //重定向地址，使用urlEncode对链接进行处理 @Value("${wx.open.redirect_url}") private String redirectUrl; //token @Value("${wx.open.token}") private String appToken; //消息加解密秘钥 @Value("${wx.open.encodingAESKey}") private String encodingAESKey; //微信小程序登录录的appid,应用唯一标识 @Value("${wx.applet.app_id}") private String appletAppId; // 微信小程序登录的应用密钥AppSecret @Value("${wx.applet.app_secret}") private String appletAppSecret; public static String WX_OPEN_APP_ID; public static String WX_OPEN_APP_SECRET; public static String WX_OPEN_REDIRECT_URL;//回调地址 public static String WX_APPLET_APP_ID; public static String WX_APPLET_APP_SECRET; @Override public void afterPropertiesSet() throws Exception { WX_OPEN_APP_ID = appId; WX_OPEN_APP_SECRET = appSecret; WX_OPEN_REDIRECT_URL = redirectUrl; WX_APPLET_APP_ID = appletAppId; WX_APPLET_APP_SECRET = appletAppSecret; } } 3.重点来啦，代码的实现（非前后端分离项目，前后端分离看最前面的重要提示） 3.1重定向 /** * description 微信授权登录接口 * param [] * return common.enums.ResultVO * author * createTime 2021/11/22 16:28 **/ @GetMapping("/WxLogin") public ResultVO WxLogin(HttpServletRequest request, HttpServletResponse response) throws Exception { response.sendRedirect(WeChatLoginUtil.getUserUathUrl(WxOpenLoginConfig.WX_OPEN_APP_ID, WxOpenLoginConfig.WX_OPEN_REDIRECT_URL));//(openid和微信回调地址/WxCallback)进行重定向 return new ResultVO(ResultCode.SUCCESS, WeChatLoginUtil.getUserUathUrl(WxOpenLoginConfig.WX_OPEN_APP_ID, WxOpenLoginConfig.WX_OPEN_REDIRECT_URL)); } return new ResultVO(ResultCode.ERROR, "请重新尝试"); } 3.1进行微信的回调 /* * * description 微信公众号回调地址 * param [code, state] * return javax.annotation.Resource * author * createTime 2021/8/27 17:42 * */ @GetMapping("/WxCallback") public ResultVO WxCallback(HttpServletRequest request) throws Exception { String code = request.getParameter("code"); String errcode = request.getParameter("errcode"); String state = request.getParameter("state"); if (StringUtils.isBlank(code)) {//返回的code为空 return new ResultVO(ResultCode.VALIDATE_FAILED); } //获取openid和access_token String accesstokenInfo = HttpClientUtil.get(util.WeChatLoginUtil.getBaseAccessTokenUrl(WxOpenLoginConfig.WX_OPEN_APP_ID, WxOpenLoginConfig.WX_OPEN_APP_SECRET, code)); if (StringUtils.isNotBlank(JSON.parseObject(accesstokenInfo).getString("errcode"))) { return new ResultVO(ResultCode.ERROR, "请重新尝试"); } JSONObject jsonObject = JSONObject.parseObject(accesstokenInfo); String accessToken = jsonObject.getString("access_token"); String openid = jsonObject.getString("openid"); String s = HttpClientUtil.get(WeChatLoginUtil.checkAccessToken(openid, accessToken));//检验授权凭证（access_token）是否有效 if (JSON.parseObject(s).getString("errcode").equals("0")) { // 3根据openid获取该用户的信息 String resultInfo = HttpClientUtil.get(util.WeChatLoginUtil.getBaseUserInfoUrl(accessToken, openid)); if (StringUtils.isNotBlank(errcode)) { return new ResultVO(ResultCode.FAILED, errcode); } ResultVO ret = getRet(request, resultInfo);//将用户数据存入到数据库 return ret; } return new ResultVO(ResultCode.SERVER_FAILED, "请重新尝试"); } 3.3之后拿到数据你就可以进行相关业务的操作啦！

参考微信官方文档微信登录官方文档：参考链接部分实现参考：

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