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微信小程序请求微信api授权登录(Java后端)

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1.小程序端调用wx.login(),获取到微信返回的code临时凭证.2.小程序端调用我方的后台接口,Java后端调用微信的api,需要appId,appSecret,js_code,grant_type:authorization_code代码如下:private JSONObject getUserWXLoginInfo(String wxCode) {String requestUrl = “https://api.weixin.qq.com/sns/jscode2session”;MapString,String requestUrlParam = new HashMapString,String();requestUrlParam.put(“appid”, GameConstants.AppID);//开发者设置中的appIdrequestUrlParam.put(“secret”, GameConstants.AppSecret);//开发者设置中的appSecretrequestUrlParam.put(“js_code”, wxCode);//小程序调用wx.login返回的coderequestUrlParam.put(“grant_type”, “authorization_code”);//默认参数//发送post请求读取调用微信 https://api.weixin.qq.com/sns/jscode2session 接口获取openid用户唯一标识JSONObject jsonObject = JSON.parseObject(UrlUtil.sendPost(requestUrl, requestUrlParam));return jsonObject;}public String login(String wxCode) throws ParseException {//请求微信api获取用户的openid和sessionKeyJSONObject jsonObject = getUserWXLoginInfo(wxCode);if(jsonObject!=null&&!jsonObject.containsKey(“openid”)) {return Common.getErrorReturn(GameMsg.CANSHU_ERROR);}String openid = (String)jsonObject.get(“openid”);String sessionKey = (String)jsonObject.get(“session_key”);//通过openid查询数据库是否有此用户ListUser userList = getUserByOpenId(openid);if(userList!=null&&userList.size()!=0) {//用户已存在if(userList.get(0).getPhone()==null) {jsonObject.put(“phone”, “”);}else {jsonObject.put(“phone”, userList.get(0).getPhone());}RedisSetter.setRedisStringDuration(openid, sessionKey, 60*60);//存到redis中,设置失效时间jsonObject.put(“userId”, userList.get(0).getUserId());jsonObject.put(“dateTime”,DatetimeUtil.dateToStamp(new Date()));return Common.getReturn(jsonObject);}User user = new User();user.setOpenid(openid);userDao.insertUser(user);ListUser newUser = getUserByOpenId(openid);if(newUser.get(0).getPhone()==null) {jsonObject.put(“phone”, “”);}else {jsonObject.put(“phone”, newUser.get(0).getPhone());}RedisSetter.setRedisStringDuration(openid, sessionKey, 60*60);//存到redis中,设置失效时间jsonObject.put(“userId”, newUser.get(0).getUserId());jsonObject.put(“dateTime”,DatetimeUtil.dateToStamp(new Date()));return Common.getReturn(jsonObject);}http请求的工具类:package com.king.util;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.URL;import java.net.URLConnection;import java.util.Iterator;import java.util.Map;import org.apache.log4j.LogManager;import org.apache.log4j.Logger;public class UrlUtil {private final Logger LOG = LogManager.getLogger(this.getClass());/** * 向指定 URL 发送POST方法的请求 *  * @param url 发送请求的 URL * @param param 请求参数 * @return 所代表远程资源的响应结果 */public static String sendPost(String url, MapString, ? paramMap) {        PrintWriter out = null;        BufferedReader in = null;        String result = “”;                String param = “”;IteratorString it = paramMap.keySet().iterator();while(it.hasNext()) {String key = it.next();param += key + “=” + paramMap.get(key) + “&”;}        try {            URL realUrl = new URL(url);            // 打开和URL之间的连接            URLConnection conn = realUrl.openConnection();            // 设置通用的请求属性            conn.setRequestProperty(“accept”, “*/*”);            conn.setRequestProperty(“connection”, “Keep-Alive”);            conn.setRequestProperty(“Accept-Charset”, “utf-8”);            conn.setRequestProperty(“user-agent”, “Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)”);            // 发送POST请求必须设置如下两行            conn.setDoOutput(true);            conn.setDoInput(true);            // 获取URLConnection对象对应的输出流            out = new PrintWriter(conn.getOutputStream());            // 发送请求参数            out.print(param);            // flush输出流的缓冲            out.flush();            // 定义BufferedReader输入流来读取URL的响应            in = new BufferedReader(new InputStreamReader(conn.getInputStream(), “UTF-8”));            String line;            while ((line = in.readLine()) != null) {                result += line;            }        } catch (Exception e) {        e.printStackTrace();        }        //使用finally块来关闭输出流、输入流        finally{            try{                if(out!=null){                    out.close();                }                if(in!=null){                    in.close();                }            }            catch(IOException ex){                ex.printStackTrace();            }        }        return result;    }}返回给小程序所需要的参数即可

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