1、在支付宝开放平台（https://open.alipay.com/platform/home.htm）申请对应的功能
找到页或者移动应用列表
你可以看到你已申请的应用
点击进入应用详情增加功能：
2、在自己的javaweb应用里引入对应的jar包
<!--阿里支付SDK--><dependency><groupId>com.alipay.sdk</groupId><artifactId>alipay-sdk-java</artifactId><version>4.3.0.ALL</version></dependency>
3、支付宝相关配置信息
可根据自己的情况配置相关的内容，下面只作为相关示意
package com.fast.tpp.dto;public class AlipayConfig {/*** 签约的支付宝账号对应的支付宝唯一用户号，以2088开头的16位纯数字组成*/public static final String PID = "xx";/*** 正式环境请求地址*/public static String ALIPAY_URL = "https://openapi.alipay.com/gateway.do";/*** 支付宝分配给开发者的应用ID**/public static String APP_ID = "xx";/*** 仅支持JSON*/public static String FORMAT = "JSON";/*** 请求使用的编码格式*/public static String CHARSET = "utf-8";/*** 商户生成签名字符串所使用的签名算法类型*/public static String SIGN_TYPE = "RSA2";/*** 支付宝公钥*/public static String ALIPAY_PUBLIC_KEY =xx";/*** 商户私钥*/public static String PRIVATE_KEY =xx";/*** 回调地址*/public static String CALLBACK_URL = "xx";/*** web支付跳转地址*/public static String WEB_RETURN_URL = "xx";}4、初始化阿里支付相关配置，只贴部分代码作参考
@Service
@Log4j2
public class AlipaySaoImpl implements AlipaySao {@Autowiredprivate RedisService redisService;// 实例化客户端AlipayClient alipayClient;public AlipaySaoImpl(){// 实例化客户端alipayClient = new DefaultAlipayClient(AlipayConfig.ALIPAY_URL,AlipayConfig.APP_ID,AlipayConfig.PRIVATE_KEY,AlipayConfig.FORMAT,AlipayConfig.CHARSET,AlipayConfig.ALIPAY_PUBLIC_KEY,AlipayConfig.SIGN_TYPE);}
5、web支付相关方法代码
package com.fast.tpp.dto;import lombok.Getter;
import lombok.Setter;
import lombok.ToString;@Setter
@Getter
@ToString
public class AlipayWebPayDTO
{/*** 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= "5m";/*** 产品编号*/private String product_code= "FAST_INSTANT_TRADE_PAY";}/*** web支付接口* @param alipayBean* @return* @throws AlipayApiException*/@Overridepublic String webPagePay(AlipayWebPayDTO alipayBean) throws AlipayApiException {// 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(AlipayConfig.WEB_RETURN_URL);// 服务器异步通知页面路径alipayRequest.setNotifyUrl(AlipayConfig.CALLBACK_URL);// 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;}
6、最终返回给客户端的result值为,里面是一个form,页面拿到后会自动跳转到支付宝的订单支付页面
{"code": "00","msg": "请求成功！","data": {"orderString": "<form name=\"punchout_form\" method=\"post\" action=\"https://openapi.alipay.com/gateway.do?charset=utf-8&method=alipay.trade.page.pay&sign=G0jsaTORXtfF1VkQEK77qu%2BnYRU1YhCNQMFiWNNBUbYgQz8pxGRGVcnzbIXWkgWawV3AXco%2BJkFEemhV7qK2ALIn6uVziNklV6Folqb6OyVnsdKdCfHbID%2Bz79M1ngpyWsWvxXoAUN6Kuib5qkurDPQfMo4HWF4fxmLF70cFkQNeHxg577ByHS0%2Borv%2BzJ%2FwqehZZqOB1JQ0jzserODf2PGieoE5PCDnIYuXMZFqJqlCRUDc1IN3h9Usez8QJhLWepcFDsDR8tXiHrMmge9onHAl9bpLUtyOuVe4TCMU%2BLgMH21NUpeKJdXgQpnQxA8DoUuU0lRTmvPEp6EyXAmE%2FQ%3D%3D&return_url=http%3A%2F%2Fwww.moyou520.com%2Fdist%2Fhtml%2Fpay%2Fresult.html¬ify_url=http%3A%2F%2Fadmin.moyou520.com%2Fmoyou%2Fapp%2Ftrans%2FalipayNotice.do&version=1.0&app_id=2019081066129967&sign_type=RSA2×tamp=2020-02-17+15%3A58%3A24&alipay_sdk=alipay-sdk-java-4.3.0.ALL&format=JSON\">\n<input type=\"hidden\" name=\"biz_content\" value=\"{"body":"购买[年度VIP]","out_trade_no":"20200217155823617499935","product_code":"FAST_INSTANT_TRADE_PAY","subject":"默友APP","timeout_express":"5m","total_amount":"0.0"}\">\n<input type=\"submit\" value=\"立即支付\" style=\"display:none\" >\n</form>\n<script>document.forms[0].submit();</script>","orderNo": "20200217155823617499935"}
}7、回调方法相关代码
/*** 支付宝支付通知* @param request* @param response* @return* @throws IOException*/@RequestMapping(value="/alipayNotice.do",method = RequestMethod.POST)@ResponseBody@NoneAuth@SysLog(actionName = "支付宝支付通知")public String alipayNotice(HttpServletRequest request, HttpServletResponse response) throws IOException {Map<String, String> params = new HashMap<String, String>();Map requestParams = request.getParameterMap();for (Iterator 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] + ",";}params.put(name, valueStr);}// 切记alipaypublickey是支付宝的公钥，请去open.alipay.com对应应用下查看。try {boolean flag = AlipaySignature.rsaCheckV1(params, AlipayConfig.ALIPAY_PUBLIC_KEY, AlipayConfig.CHARSET,AlipayConfig.SIGN_TYPE);if (flag) {String tradeStatus = params.get("trade_status");String outTradeNo = params.get("out_trade_no");String tradeNo = params.get("trade_no");//购买者用户IDString openId = params.get("buyer_logon_id");this.orderService.alipayNotice(tradeStatus,outTradeNo,tradeNo,openId);if ("TRADE_SUCCESS".equals(tradeStatus)){return "success";}}} catch (Exception e) {e.printStackTrace();}return "fail";}
大致如上，欢迎大家批评指正
