QrCodeUtil.generate("www.baidu.com", 300, 300, FileUtil.file("D:\\qrcode.jpg"));

/**

 * 生成一个 600 * 600 的二维码

 * 纠错级别设置为 H

 * L,M,Q,H 几个参数，由低到高，低级别的像素块更大

 */

QrConfig config = new QrConfig(600, 600);

// 设置纠错级别

config.setErrorCorrection(ErrorCorrectionLevel.H);

// 设置二维码的颜色

config.setBackColor(Color.BLUE);

QrCodeUtil.generate("www.baidu.com", config, FileUtil.file("D:\\qrcode.jpg"));

@GetMapping("wxCheck")

public String er(String signature, String timestamp, String nonce, String echostr) {

   System.out.println("echostr 微信给的随机字符串 = " + echostr);

   // 如果这里不返回 那么在点击提交时就会报错提示配置失败的

   return echostr;

}

// 将测试号管理页面的 appid 放到此处，后续可以配置到 yml 中进行读取

private static final String appid = "wx0777296eb82be4f2";

@GetMapping("wxLogin")

public void wxLoginPage(HttpServletResponse response) {

   try

   {

      // 回调地址

      String redirectUrl = URLEncoder.encode("http://z7yqny.natappfree.cc/wxCallback", "UTF-8");

      // 用户同意授权获取 code 其中拼接上 appid 和回调地址

      String url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=" + appid + "&redirect_uri=" + redirectUrl

         + "&response_type=code&scope=snsapi_userinfo&state=STATE#wechat_redirect";

      // 设置响应格式为图片

      response.setContentType("image/png");

      // 生成二维码写出到页面中

      QrCodeUtil.generate(url, 300, 300, "jpg", response.getOutputStream());

   } catch (Exception e)

   {

      throw new RuntimeException(e);

   }

}

@Data

public class TokenInfo

{

    private String access_token;

    private String expires_in;

    private String refresh_token;

    private String openid;

    private String scope;

}

@GetMapping("wxCallback")

public String pcCallback(String code, String state, HttpServletRequest request, HttpServletResponse response, HttpSession session) throws IOException

{

   return JSON.toJSONString(WechatUtils.getUserInfo(code));

}

public class WechatUtils

{

    private static final String appId = "wx0777296eb82be4f2";

    private static final String secret = "8f93fb4fb289037d1ea0775ad33cccd0";

    public static WeChatUser getUserInfo(String code) throws IOException

    {

        HttpClient httpClient = HttpClients.createDefault();

        // 用 code 交换 token 访问的地址，需要给 appid 还有 (秘钥) secret 以及刚刚微信返回的 code 码，以及指定方式授权类型为授权码模式

        String tokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=" + appId + "&SECRET=" + secret + "&code=" + code + "&grant_type=authorization_code";

        // 通过 HttpGet 对象构造发起 GET 请求，请求上面的连接

        HttpGet httpGet = new HttpGet(tokenUrl);

        // 存储响应结果的变量

        String responseResult = "";

        // 发起 GET 请求

        HttpResponse response = httpClient.execute(httpGet);

        // 如果状态码为 200 及成功就将结果赋值给 存储结果变量

        if (response.getStatusLine().getStatusCode() == 200)

        {

            responseResult = EntityUtils.toString(response.getEntity(), "UTF-8");

        }

        return null;

    }

}

@Data

public class WeChatUser

{

    private String openid;

    private String nickname;

    private Integer sex;

    private String country;

    private String city;

    private String province;

    private String headimgurl;

    private String privilege;

    private String unionid;

}

public class WechatUtils

{

    private static final String appId = "wx0777296eb82be4f2";

    private static final String secret = "8f93fb4fb289037d1ea0775ad33cccd0";

    public static WeChatUser getUserInfo(String code) throws IOException

    {

        HttpClient httpClient = HttpClients.createDefault();

        // 用 code 交换 token 访问的地址，需要给 appid 还有 (秘钥) secret 以及刚刚微信返回的 code 码，以及指定方式授权类型为授权码模式

        String tokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=" + appId + "&SECRET=" + secret + "&code=" + code + "&grant_type=authorization_code";

        // 通过 HttpGet 对象构造发起 GET 请求，请求上面的连接

        HttpGet httpGet = new HttpGet(tokenUrl);

        // 存储响应结果的变量

        String responseResult = "";

        // 发起 GET 请求

        HttpResponse response = httpClient.execute(httpGet);

        // 如果状态码为 200 及成功就将结果赋值给 存储结果变量

        if (response.getStatusLine().getStatusCode() == 200)

        {

            responseResult = EntityUtils.toString(response.getEntity(), "UTF-8");

        }

        // 拿到 token 信息将信息封装到 TokenInfo 对象中

        TokenInfo tokenInfo = JSON.parseObject(responseResult, TokenInfo.class);

        // 通过连接加上 token 还有 openId 获取个人信息

        String userInfoUrl = "https://api.weixin.qq.com/sns/userinfo?access_token=" + tokenInfo.getAccess_token() + "&openid=" + tokenInfo.getOpenid() + "&lang=zh_CN";

        HttpGet httpGetOne = new HttpGet(userInfoUrl);

        HttpResponse responseOne = httpClient.execute(httpGetOne);

        if (responseOne.getStatusLine().getStatusCode() == 200)

        {

            responseResult = EntityUtils.toString(responseOne.getEntity(), "UTF-8");

        }

        // 将请求到的用户信息封装到 用户信息类中并返回这个对象

        WeChatUser weChatuser = JSON.parseObject(responseResult, WeChatUser.class);

        return weChatuser;

    }

}