1. 后台开发环境：

语言：java

框架：springboot

2. 代码示例：

package com.zc.wechat.web;import com.zc.common.api.util.Result;
import com.zc.wechat.model.Token;
import com.zc.wechat.model.app.Jscode2sessionResult;
import com.zc.wechat.service.WechatAppService;
import com.zc.wechat.service.WechatServerService;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;import java.io.IOException;@Controller
@RequestMapping("/wechat")
public class WechatController {@Value("${wechat.appid}")private String appid;@Autowiredprivate WechatServerService wechatServerService;@Autowiredprivate WechatAppService wechatAppService;/*** 获取登录系统的token** @return*/@RequestMapping(value = "/user/getToken", method = {RequestMethod.GET})@ResponseBodypublic Result<Token> getToken(@RequestParam(value = "code") String code) throws IOException {final String appId = appid;Jscode2sessionResult openidResult = wechatAppService.getJscode2session(appId, code, "authorization_code");Result<Token> result = new Result();Token token = wechatServerService.getTokenByOpenid(openidResult.getOpenid());result.setResult(token);return result;}@RequestMapping(value = "/user/bind", method = {RequestMethod.POST})@ResponseBodypublic Result<Token> bindUser(@RequestParam(value = "userName") String userName,@RequestParam(value = "password") String password,@RequestParam(value = "state", required = false) String state,@RequestParam(value = "code") String code) {Result<Token> result = new Result();if(!wechatServerService.checkUser(userName, password)){result.setStatus(Result.STATUS_FAIL);return result;}final String appId = appid;Jscode2sessionResult openidResult = wechatAppService.getJscode2session(appId, code, "authorization_code");String openid= openidResult.getOpenid();if(StringUtils.isEmpty(openid)){result.setStatus(Result.STATUS_FAIL);return result;}if(!wechatServerService.bindUser(userName, openid)){result.setStatus(Result.STATUS_FAIL);return result;}result.setResult(wechatServerService.getTokenByOpenid(openid));return result;}
}

说明：bindUser方法获取从小程序端传过来的参数，其中userName和password是自身系统的用户名密码，code是上一篇帖子里提到的微信小程序的code，通过微信的API接口拿到openid，和自身的系统进行绑定。getToken方法是获取auth2的用户token，以后用户进入小程序后，去拿token，没有的话跳转到绑定页面。用户的其他请求都要带上token，这样就能判断登录用户了。