Java接入支付宝授权第三方登录的完整步骤

https://openauth.alipay.com/oauth2/publicAppAuthorize.htm?
app_id=2016####&scope=auth_user&edirect_uri=http://ip | 域名 + 接口地址

https://openauth.alipay.com/oauth2/publicAppAuthorize.htm?app_id=2016####
&state=自定义参数(多个用逗号拼接)&scope=auth_user&edirect_uri=http://ip | 域名 + 接口地址

# 支付宝配置
ali:
  appId: 2016####

  # 自己的私钥
  merchantPrivateKey: 连接生成的私钥
  # 支付宝公钥
  alipayPublicKey: 链接生成的公钥配置后支付宝给到的支付宝公钥
  # 签名方式
  signType: RSA2
  # 字符编码格式
  charset: UTF-8
  # 字符编码格式
  format: json
  # 支付宝网关 https://openapi.alipay.com/gateway.do 是正式的
  gatewayUrl: https://openapidev.alipay.com/gateway.do #dev是沙箱

import com.alipay.api.AlipayClient;
import com.alipay.api.DefaultAlipayClient;
import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

/**
 * 支付宝配置
 */
@Data
@Component
@ConfigurationProperties(prefix = "ali")
public class AliPayProperty {

    /**
     * 支付宝APPID
     */
    public String appId;
    /**
     * 商户私钥，您的PKCS8格式RSA2私钥
     */
    public String merchantPrivateKey ;
    /**
     * 支付宝公钥,查看地址：https://openhome.alipay.com 对应APPID下的支付宝公钥。
     */
    public String alipayPublicKey;
    /**
     * 接口格式规范
     */
    public String format;
    /**
     * 签名方式
     */
    public String signType;
    /**
     * 字符编码格式
     */
    public String charset;
    /**
     * 支付宝网关  https://openapi.alipay.com/gateway.do 这是正式地址
     */
    public String gatewayUrl;

    /**
     * 支付宝客户端
     * @return
     */
    public AlipayClient getAlipayClient(){
        AlipayClient alipayClient = new DefaultAlipayClient(
                this.gatewayUrl,
                this.appId,
                this.merchantPrivateKey,
                this.format,
                this.charset,
                this.alipayPublicKey,
                this.signType);
        return alipayClient;
    }

}

@GetMapping(value = "/loginCallBack")
public String loginCallBack(HttpServletRequest request){
	return aliPayService.loginCallBack(request);
}

public String loginCallBack(HttpServletRequest request){
	//获取用户扫码授权的参数
	Map<String,String> map = this.getAliPayParam(request);
	//获取用户扫码后的code
	String code = map.get("auth_code");
	//构建阿里客户端
    AlipayClient alipayClient = aliPayProperty.getAlipayClient();
	//获取阿里用户token
    AlipaySystemOauthTokenResponse aliUserToken = 
    			this.getAliUserToken(code, alipayClient,0);
    //获取用户信息
    AlipayUserInfoShareResponse infoShareResponse = 
    			this.getUserInfo(alipayClient, aliUserToken, 0);
    //！！！沙箱环境用户没有这些基本信息但是可以看到支付宝接口是成功的
    return "SUECCSS";
}

    public Map<String,String> getAliPayParam(HttpServletRequest request) {
        Map<String,String> map = new HashMap();
        Map<String, String[]> requestParams = request.getParameterMap();
        for (Iterator<String> iter = requestParams.keySet().iterator(); iter.hasNext();) {
            String name = (String) iter.next();
            String[] values = (String[]) requestParams.get(name);
            String valueStr = "";
            for (int i = 0; i < values.length; i++) {
                valueStr = (i == values.length - 1) ? valueStr + values[i] : valueStr + values[i] + ",";
            }
            // 乱码解决，这段代码在出现乱码时使用
//            valueStr = new String(valueStr.getBytes("ISO-8859-1"), "utf-8");
            map.put(name, valueStr);
            log.info("接受支付宝回调参数：{}",map);
        }
        return map;
    }

    private AlipaySystemOauthTokenResponse getAliUserToken(String code, AlipayClient alipayClient,int number) throws AlipayApiException {
        AlipaySystemOauthTokenRequest alipaySystemOauthTokenRequest = new AlipaySystemOauthTokenRequest();
        alipaySystemOauthTokenRequest.setGrantType("authorization_code");
        alipaySystemOauthTokenRequest.setCode(code);
        AlipaySystemOauthTokenResponse oauthTokenResponse = alipayClient.execute(alipaySystemOauthTokenRequest);
        log.info("获得用户+++++++++++++++token:{}+++++++++++++++",oauthTokenResponse.getAccessToken());
        log.info("获得用户+++++++++++++++uuid:{}+++++++++++++++",oauthTokenResponse.getUserId());
        if(oauthTokenResponse.isSuccess()){
            log.info("成功");
        } else {
        	log.info("***********失败，自旋开始第：{}次",number);
            number += 1;
            if(number < 3){
                log.info("获取token失败，尝试：*******{}*******",number);
                return this.getAliUserToken(apiPayLoginReq, alipayClient, number);
            }
        }
        return oauthTokenResponse;
    }

private AlipayUserInfoShareResponse getUserInfo(AlipayClient alipayClient,AlipaySystemOauthTokenResponse aliUserToken,int number) throws AlipayApiException {
        AlipayUserInfoShareRequest alipayUserInfoShareRequest = new AlipayUserInfoShareRequest();
        AlipayUserInfoShareResponse infoShareResponse = alipayClient.execute(alipayUserInfoShareRequest,aliUserToken.getAccessToken());
        log.info("----------------获得支付宝用户详情：{}",infoShareResponse.getBody());
        UserInfoReq userInfoReq = new UserInfoReq();
        if(infoShareResponse.isSuccess()){
            //用户授权成功
            log.info("----------------获得支付宝用户基本而信息：{}",userInfoReq);
            log.info("成功");
        } else {
            log.info("***********失败，自旋开始第：{}次",number);
            number += 1;
            if(number < 3){
                log.info("调用用户详情失败，尝试：*******{}*******",number);
                return this.getUserInfo(alipayClient,aliUserToken,number);
            }
            return infoShareResponse ;
        }
    }