调用支付宝支付接口

 service层：

import com.alipay.api.AlipayApiException;
import java.util.Map;

public interface PayService {

	String AlipayTradePagePay(Map content) throws AlipayApiException;

}

import com.alibaba.fastjson.JSON;
import com.alipay.api.AlipayClient;
import com.alipay.api.DefaultAlipayClient;
import com.alipay.api.request.AlipayTradePagePayRequest;
import org.springframework.beans.factory.config.PropertiesFactoryBean;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.stereotype.Service;
import com.alipay.api.AlipayApiException;
import com.louis.epay.alipay.service.PayService;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;

@Service
public class PayServiceImpl implements PayService {
	/**
	 * AlipayTradePagePay 方法
	 * 说明：网页支付
	 * 创建人：yangkai
	 * @param content: 
	 * @return java.lang.String
	 * @throws 
	 */
	@Override
	public String AlipayTradePagePay(Map content) throws AlipayApiException {
		Map propertiesMap=new HashMap<>();
		// 获得PathMatchingResourcePatternResolver对象
		PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
		try {
			// 加载resource文件(也可以加载resources)
			Resource resources = resolver.getResource("classpath:alipay.properties");
			PropertiesFactoryBean config = new PropertiesFactoryBean();
			config.setLocation(resources);
			config.afterPropertiesSet();
			Properties prop = config.getObject();
			// 循环遍历所有得键值对并且存入集合
			for (String key : prop.stringPropertyNames()) {
				propertiesMap.put(key, (String) prop.get(key));
			}
		} catch (Exception e) {
			new Exception("配置文件加载失败");
		}

		String gatewayUrl = propertiesMap.get("gatewayUrl");
		String appId = propertiesMap.get("appId");
		String privateKey = propertiesMap.get("privateKey");
		String format = "json";
		String charset = propertiesMap.get("charset");
		String publicKey = propertiesMap.get("publicKey");
		String signType = propertiesMap.get("signType");
		String notifyUrl = propertiesMap.get("notifyUrl");
		String returnUrl = propertiesMap.get("returnUrl");

		AlipayClient alipayClient = new DefaultAlipayClient(gatewayUrl, appId, privateKey, format, charset, publicKey, signType);
		// 设置请求参数
		AlipayTradePagePayRequest alipayRequest = new AlipayTradePagePayRequest();
		// 服务器异步通知页面路径
		alipayRequest.setNotifyUrl(notifyUrl);
		// 页面跳转同步通知页面路径
		alipayRequest.setReturnUrl(returnUrl);
		// 封装参数
		alipayRequest.setBizContent(JSON.toJSONString(content));
		// 3、请求支付宝进行付款，并获取支付结果
		String result = alipayClient.pageExecute(alipayRequest).getBody();
		// 返回付款信息
		return result;
	}

}

controller层：

import com.louis.epay.alipay.bean.AlipayBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import com.alipay.api.AlipayApiException;
import com.louis.epay.alipay.service.PayService;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import java.util.Map;

@RestController
@RequestMapping("Alipay")
public class AlipayController {

	@Autowired
	private PayService payService;

	@PostMapping(value = "AlipayTradePagePay")
	public String AlipayTradePagePay(String out_trade_no, String subject, String total_amount, String body) throws AlipayApiException {
		// 封装请求支付信息
		Map content=AlipayBean.AlipayTradePagePay(out_trade_no,total_amount,subject);
		return payService.AlipayTradePagePay(content);
	}

	@RequestMapping("returnUrl")
	public void returnUrl(HttpServletRequest request) {
		System.out.println("同步回调");
	}
	@RequestMapping("notifyUrl")
	@ResponseBody
	public void notifyUrl(HttpServletRequest request) {
		System.out.println("异步回调");
	}
}