自己写的支付宝集成工具类，直接调用

package com.xhlc.pay.util;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.StringUtils;

import com.alibaba.fastjson.JSON;
import com.alipay.api.AlipayApiException;
import com.alipay.api.AlipayClient;
import com.alipay.api.AlipayConstants;
import com.alipay.api.DefaultAlipayClient;
import com.alipay.api.domain.AlipayTradeAppPayModel;
import com.alipay.api.request.AlipayOpenAuthTokenAppRequest;
import com.alipay.api.request.AlipaySystemOauthTokenRequest;
import com.alipay.api.request.AlipayTradeAppPayRequest;
import com.alipay.api.request.AlipayTradeQueryRequest;
import com.alipay.api.request.AlipayTradeRefundRequest;
import com.alipay.api.request.AlipayUserInfoShareRequest;
import com.alipay.api.response.AlipayOpenAuthTokenAppResponse;
import com.alipay.api.response.AlipaySystemOauthTokenResponse;
import com.alipay.api.response.AlipayTradeAppPayResponse;
import com.alipay.api.response.AlipayTradeQueryResponse;
import com.alipay.api.response.AlipayTradeRefundResponse;
import com.alipay.api.response.AlipayUserInfoShareResponse;
import com.smy.framework.core.config.Property;
import com.xhlc.pay.dto.AliRefundRequestDto;
import com.xhlc.pay.dto.AliSignOrderRequestDto;

/**
 * https://openauth.alipay.com/oauth2/appToAppAuth.htm?app_id=2017121300692655&
 * redirect_uri=http://oliver.vicp.io:12886/alipayTest/return_url.jsp 支付宝 集成工具
 * 
 * @since 2017-12-20
 * @author oliver
 * 
 */
public class AlipayUtils {

	private static String appId;

	private static String privateKey;

	public static String publicKey;

	private static String redirectIp;

	static {
		appId = Property.getProperty（“alipay.appId“ ““）;
		privateKey = Property.getProperty（“alipay.privateKey“ ““）;
		publicKey = Property.getProperty（“alipay.publicKey“ ““）;
		redirectIp = Property.getProperty（“alipay.redirectIp“ ““）;
	}

	private static Logger LOG = LoggerFactory.getLogger（AlipayUtils.class）;
	// 统一收单交易创建接口
	private static AlipayClient alipayClient = null;

	public static AlipayClient getAlipayClient（） {
		if （alipayClient == null） {
			synchronized （AlipayUtils.class） {
				if （null == alipayClient） {
					alipayClient = new DefaultAlipayClient（“https://openapi.alipay.com/gateway.do“ appId privateKey
							AlipayConstants.FORMAT_JSON AlipayConstants.CHARSET_UTF8 publicKey “RSA2“）;
				}
			}
		}
		return alipayClient;
	}

	/**
	 * 用户同意授权，获取authCode
	 * 
	 * @param url
	 *            回调地址
	 * @return
	 */
	public static String visitUrl（String url） {
		String encodeUrl = ““;
		try {
			encodeUrl = URLEncoder.encode（url “UTF-8“）;
		} catch （UnsupportedEncodingException e） {
			return null;
		}
		String scope = “auth_userauth_base“;
		String visitUrl = “https://openauth.alipay.com/oauth2/publicAppAuthorize.htm?app_id=“ + appId + “&s