小程序登录，通过code获取openId 或者通过code或者手机号码(新版)

小程序的登录，通过前端传过来code，在服务端（java）获取openId返回给前端进行登录。

首先你得有appid以及secret(秘钥).

 

下面是业务逻辑代码（这里为了方便展示直接写在了controller）

@GetMapping("getCode")
public AjaxResult getCode(String code){
    // 授权（必填）
    String wxspAppid = "填写小程序appid";
    String wxspSecret = "填写小程序密钥";
    //默认是authorization_code
    String grant_type = "authorization_code";
    // 请求参数
    String params = "appid=" + wxspAppid + "&secret=" + wxspSecret + "&js_code=" + code + "&grant_type=" + grant_type;
    // 发送请求
    String sr = HttpRequest.sendPost("https://api.weixin.qq.com/sns/jscode2session", params);
    // 解析相应内容（转换成json对象）
    JSONObject json = JSONObject.parseObject(sr);
    logger.info("解析code请求结果:"+json.toString());
    // 获取会话密钥（session_key）
    //String session_key = json.getString("session_key");
    //获取openId
    String openid = json.getString("openid");
    return AjaxResult.success(openid);
}

JSONObject 引入的是alibaba的jar

import com.alibaba.fastjson.JSONObject;

 

依赖

        <!-- alibaba json 工具  -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
        </dependency>

 

 

HttpRequest工具类类

/**
     * 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，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost(String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        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("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()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送 POST 请求出现异常！" + 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;
    }

 

新版本，通过code去获取手机号码

phonenumber.getPhoneNumber

 

    //新版本
    public String getPhoneByCode(String code) {
        ResponseEntity<String> responseEntity = restTemplate.getForEntity(weChatConfig.getApiAddress() + "/cgi-bin/token?grant_type={grant_type}&appid={appid}&secret={secret}", String.class, weChatConfig.getClientCredential(), weChatConfig.getAppId(), weChatConfig.getSecretKey());
        //ResponseEntity<String> responseEntity = restTemplate.getForEntity("https://api.weixin.qq.com/cgi-bin/token?grant_type={grant_type}&appid={appid}&secret={secret}", String.class, params);
        log.info("获取wxtoken结果集 {}", responseEntity);
        Map map = JSONObject.parseObject(responseEntity.getBody(), Map.class);
        if (!StringUtils.isEmpty(map.get("errcode"))) {
            throw new DefaultException("获取token参数有误");
        }
        if (!StringUtils.isEmpty(map.get("access_token"))) {
            String accessToken = map.get("access_token").toString();

            Map<String, String> param = new HashMap<>();
            if (!StringUtils.isEmpty(code)) {
                param.put("code", code);
            }
            HttpHeaders headers = new HttpHeaders();
            headers.setContentType(MediaType.APPLICATION_JSON);
            headers.set("Accept", "application/json");
            HttpEntity<Map<String, String>> httpEntity = new HttpEntity<Map<String, String>>(param, headers);
            String url = weChatConfig.getApiAddress() + "/wxa/business/getuserphonenumber?access_token=" + accessToken;
            ResponseEntity<String> postResponseEntity = restTemplate.postForEntity(url, httpEntity, String.class);
            log.info("获取postResponseEntity结果集 {}", postResponseEntity);
            log.info("根据code过获取手机号码返回值 {}", postResponseEntity.getBody());
            Map postMap = JSONObject.parseObject(postResponseEntity.getBody(), Map.class);
            log.info("根据code过获取手机号码返回值转json {}", postMap);

            // 使用Jackson库将JSON字符串解析为Map
            ObjectMapper objectMapper = new ObjectMapper();
            Map<String, Object> resultMap = null;
            try {
                resultMap = objectMapper.readValue(postResponseEntity.getBody(), Map.class);
            } catch (JsonProcessingException e) {
                e.printStackTrace();
            }
            Map<String, Object> phoneInfo = (Map<String, Object>) resultMap.get("phone_info");
            log.info("objectMapper返回成功 {}", phoneInfo);
            assert postMap != null;
            if (!StringUtils.isEmpty(postMap.get("errcode"))) {
                String errcode = postMap.get("errcode").toString();
                if (WxLoginEnum.SYSTEM_BUSY.getCode().equals(errcode)) {
                    throw new DefaultException(WxLoginEnum.SYSTEM_BUSY.getValue());
                }
                if (WxLoginEnum.EXPIRED.getCode().equals(errcode)) {
                    throw new DefaultException(WxLoginEnum.EXPIRED.getValue());
                }
                if (WxLoginEnum.ILLEGALITY.getCode().equals(errcode)) {
                    throw new DefaultException(WxLoginEnum.ILLEGALITY.getValue());
                }
                if (WxLoginEnum.SUCCESS.getCode().equals(errcode)) {
                    return phoneInfo.get("phoneNumber").toString();
                }
            }
        }
        throw new DefaultException("未获取到手机号");
    }

 

 

WxLoginEnum

public enum WxLoginEnum {

    SYSTEM_BUSY("-1", "系统繁忙，请稍后重试"),
    EXPIRED("40029", "code不存在或已过期，请重试"),
    ILLEGALITY("40013", "不合法AppId"),
    SUCCESS("0", "成功");

    private String code;

    private String value;

    WxLoginEnum(String code, String value) {
        this.code = code;
        this.value = value;
    }
    public String getCode() {
        return code;
    }


    public String getValue() {
        return value;
    }

}

 

配置

  client-credential: client_credential
  login-address: https://api.weixin.qq.com/sns/jscode2session
  api-address: https://api.weixin.qq.com

appid和秘钥跟之前的一样

 

 

好了，有问题的小伙伴请留言哦！

 

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