Java spring boot 实现支付宝支付功能的示例代码

<dependency>
   <groupId>com.alipay.sdk</groupId>
   <artifactId>alipay-sdk-java</artifactId>
   <version>4.9.9</version>
  </dependency>

# 您的APPID
appId = 2016102200738709
# 商户私钥
privateKey = 您的商户私钥
# 支付宝公钥
publicKey = 您的支付宝公钥
# 服务器异步通知页面路径 ,需要公网能访问到。
notifyUrl = http://公网能访问的路径
# 页面跳转同步通知页面路径 需要公网能访问到。
returnUrl = http://公网能访问的路径
# 签名方式
signType = RSA2
# 字符编码格式
charset = utf-8
# 支付宝网关
gatewayUrl = https://openapi.alipaydev.com/gateway.do
# 支付宝网关
logPath = "C:\\"

public class AlipayBean {

 /**
  * 商户订单号，必填
  *
  */
 private String out_trade_no;
 /**
  * 订单名称，必填
  */
 private String subject;
 /**
  * 付款金额，必填
  * 根据支付宝接口协议，必须使用下划线
  */
 private String total_amount;
 /**
  * 商品描述，可空
  */
 private String body;
 /**
  * 超时时间参数
  */
 private String timeout_express= "10m";
 /**
  * 产品编号
  */
 private String product_code= "FAST_INSTANT_TRADE_PAY";
	
 /**
  * 省略get set 方法
  */
}

/**
 * 支付宝支付接口
 */
@Component
public class Alipay {

 /**
  * 支付接口
  * @param alipayBean
  * @return
  * @throws AlipayApiException
  */
 public String pay(AlipayBean alipayBean) throws AlipayApiException {
  // 1、获得初始化的AlipayClient
  String serverUrl = AlipayProperties.getGatewayUrl();
  String appId = AlipayProperties.getAppId();
  String privateKey = AlipayProperties.getPrivateKey();
  String format = "json";
  String charset = AlipayProperties.getCharset();
  String alipayPublicKey = AlipayProperties.getPublicKey();
  String signType = AlipayProperties.getSignType();
  String returnUrl = AlipayProperties.getReturnUrl();
  String notifyUrl = AlipayProperties.getNotifyUrl();
  AlipayClient alipayClient = new DefaultAlipayClient(serverUrl, appId, privateKey, format, charset, alipayPublicKey, signType);
  // 2、设置请求参数
  AlipayTradePagePayRequest alipayRequest = new AlipayTradePagePayRequest();
  // 页面跳转同步通知页面路径
  alipayRequest.setReturnUrl(returnUrl);
  // 服务器异步通知页面路径
  alipayRequest.setNotifyUrl(notifyUrl);
  // 封装参数
  alipayRequest.setBizContent(JSON.toJSONString(alipayBean));
  // 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;
 }
}

/**
 * 应用启动加载文件
 */
@Component
public class AlipayProperties {

 public static final String APP_ID = "appId";
 public static final String PRIVARY_KEY = "privateKey";
 public static final String PUBLIC_KEY = "publicKey";
 public static final String NOTIFY_URL = "notifyUrl";
 public static final String RETURN_URL = "returnUrl";
 public static final String SIGN_TYPE = "signType";
 public static final String CHARSET = "charset";
 public static final String GATEWAY_URL = "gatewayUrl";
 public static final String LOG_PATH = "logPath";

 /**
  * 保存加载配置参数
  */
 private static Map<String, String> propertiesMap = new HashMap<String, String>();

 /**
  * 加载属性
  */
 public static void loadProperties() {
  // 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:你的alipay.properties文件路径");
   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");
  }
 }

 /**
  * 获取配置参数值
  * @param key
  * @return
  */
 public static String getKey(String key) {
  return propertiesMap.get(key);
 }

 public static String getAppId() {
  return propertiesMap.get(APP_ID);
 }

 public static String getPrivateKey() {
  return propertiesMap.get(PRIVARY_KEY);
 }

 public static String getPublicKey() {
  return propertiesMap.get(PUBLIC_KEY);
 }

 public static String getNotifyUrl() {
  return propertiesMap.get(NOTIFY_URL);
 }

 public static String getReturnUrl() {
  return propertiesMap.get(RETURN_URL);
 }

 public static String getSignType() {
  return propertiesMap.get(SIGN_TYPE);
 }

 public static String getCharset() {
  return propertiesMap.get(CHARSET);
 }

 public static String getGatewayUrl() {
  return propertiesMap.get(GATEWAY_URL);
 }

 public static String getLogPath() {
  return propertiesMap.get(LOG_PATH);
 }

}

/**
 * 配置文件监听器，用来加载自定义配置文件
 */
@Component
public class PropertiesListener implements ApplicationListener<ApplicationStartedEvent> {

 @Override
 public void onApplicationEvent(ApplicationStartedEvent event) {
  AlipayProperties.loadProperties();
 }
}

/**
 * 支付服务
 */
public interface PayService {

 /**
  * 支付宝支付接口
  * @param alipayBean
  * @return
  * @throws AlipayApiException
  */
 String aliPay(AlipayBean alipayBean) throws AlipayApiException;

}

@Service
public class PayServiceImpl implements PayService {

 @Autowired
 private Alipay alipay;

 @Override
 public String aliPay(AlipayBean alipayBean) throws AlipayApiException {
  return alipay.pay(alipayBean);
 }

}

/**
 * 订单接口
 *
 * @author Louis
 * @date Dec 12, 2018
 */
@RestController()
@RequestMapping("order")
public class OrderController {

 @Autowired
 private PayService payService;

 @RequestMapping(value = "alipay")
 public String alipay(String outTradeNo, String subject, String totalAmount, String body) throws AlipayApiException {
  AlipayBean alipayBean = new AlipayBean();
  alipayBean.setOut_trade_no(outTradeNo);
  alipayBean.setSubject(subject);
  alipayBean.setTotal_amount(totalAmount);
  alipayBean.setBody(body);
  return payService.aliPay(alipayBean);
 }

	//支付成功支付宝调用方法：
 @RequestMapping(value = "ok")
 public void ok(){
  System.out.println("付款成功！");
 }
}