第二步，引入jar包：

<dependency>
    <groupId>com.egzosn</groupId>
    <artifactId>pay-java-common</artifactId>
    <version>2.10.2</version>
</dependency>
<dependency>
    <groupId>com.egzosn</groupId>
    <artifactId>pay-java-ali</artifactId>
    <version>2.10.2</version>
</dependency>

第三步： 基於沙箱環境 配置引數，正式環境的  需要配置正式環境：

private PayService service = null;

@PostConstruct
public void init() {
    AliPayConfigStorage aliPayConfigStorage = new AliPayConfigStorage();
    aliPayConfigStorage.setPid("合作者id");
    aliPayConfigStorage.setAppId("應用id");
    aliPayConfigStorage.setKeyPublic("支付寶公鑰");
    aliPayConfigStorage.setKeyPrivate("應用私鑰");
    aliPayConfigStorage.setNotifyUrl("非同步回撥地址");
    aliPayConfigStorage.setSignType(SignUtils.RSA.name());
    aliPayConfigStorage.setSeller(“上家收款賬號”);
    aliPayConfigStorage.setInputCharset("utf-8");

    //是否為測試賬號，沙箱環境
    aliPayConfigStorage.setTest(true);

    //請求連線池配置
    HttpConfigStorage httpConfigStorage = new HttpConfigStorage();
    //最大連線數
    httpConfigStorage.setMaxTotal(20);
    //預設的每個路由的最大連線數
    httpConfigStorage.setDefaultMaxPerRoute(10);
    service =  new AliPayService(aliPayConfigStorage, httpConfigStorage);


}

第四步：供app提供建立訂單資訊介面：

@ApiOperation("返回訂單資訊")
@RequestMapping(value = "app", method = RequestMethod.POST)
public Map payBack(@RequestBody PayOrder payOrder) throws IOException{
    init();
    payOrder.setTransactionType(AliTransactionType.APP);
    Map<String, Object> data = new HashMap<>();
    data.put("state", 1);
    //App支付
    payOrder.setTransactionType(AliTransactionType.APP);
    data.put("orderInfo", service.orderInfo(payOrder));
    //獲取APP支付所需的資訊組，直接給app端就可使用
    return data;
}

第五步：校驗回撥資訊，設定業務邏輯：注意：此api,不需要設定api方法。否則，可能會回撥不成功。

@ApiOperation("回撥地址")
@RequestMapping(value = "payBack")
public String payBack(HttpServletRequest request) throws IOException{
    init();
    //獲取支付寶POST過來反饋資訊
    Map params=service.getParameter2Map(request.getParameterMap(), request.getInputStream());
    if(null ==params) return service.getPayOutMessage("fail", "失敗").toMessage();
    System.out.println("支付寶支付結果通知"+params.toString());

    //校驗
    if (service.verify(params)) {

        //這裡處理業務邏輯
        String orderNo=(String)params.get("out_trade_no");
        if(StringUtils.isNotBlank(orderNo)){
            scmSalesOrderService.updateStatus(orderNo);
        }
        //......業務邏輯處理塊........
        return service.getPayOutMessage("success", "成功").toMessage();
    }

    return service.getPayOutMessage("fail", "失敗").toMessage();
}