官方文档：https://opendocs.alipay.com/open/270/105899

本地开发环境支付回调调试方法可以参考：https://www.cnblogs.com/pxblog/p/11623053.html

所需内容：

1、APPID(APPID) 即创建应用后生成 获取：https://opendocs.alipay.com/open/200/105310
2、APP_PRIVATE_KEY(开发者私钥) 获取：https://opendocs.alipay.com/open/291/105971
3、ALIPAY_PUBLIC_KEY(支付宝公钥) 获取： https://opendocs.alipay.com/open/291/105971

jar包下载：https://yvioo.lanzous.com/iGR8pe3qkha

配置类

AliPayConfig.java

package com.alipay;

public class AliPayConfig {
/*******支付宝支付参数*********/

// 商户appid  教程：https://opendocs.alipay.com/open/200/105310  
public static String APPID = "";

// 私钥 pkcs8格式的 由开发者自己生成  教程：https://opendocs.alipay.com/open/291/105971  
public static String RSA\_PRIVATE\_KEY = "";

// 支付宝公钥 由支付宝生成  教程：https://opendocs.alipay.com/open/291/105971  
public static String ALIPAY\_PUBLIC\_KEY = "";

// 服务器异步通知路径 需http://或者https://格式的完整路径，不能加?id=123这类自定义参数，必须外网可以正常访问  
public static String notify\_url = "/alipay\_notice";

// 页面跳转同步通知页面路径 需http://或者https://格式的完整路径，不能加?id=123这类自定义参数，必须外网可以正常访问 商户可以自定义同步跳转地址  
public static String return\_url = "/alipay\_return";

// 请求网关地址  
public static String URL = "https://openapi.alipay.com/gateway.do";

// 编码  
public static String CHARSET = "UTF-8";

// 返回格式  
public static String FORMAT = "json";

// 日志记录目录  
public static String log\_path = "/log";

// RSA2  
public static String SIGNTYPE = "RSA2";

}

支付工具类

AliPay.java

package com.alipay;

import com.alipay.api.AlipayClient;
import com.alipay.api.DefaultAlipayClient;
import com.alipay.api.request.AlipayTradePagePayRequest;

import javax.servlet.http.HttpServletResponse;

public class AliPay {

/\*\*  
 \* PC网站快速支付  
 \*  
 \* @param response  
 \* @param orderNo 订单号  
 \* @param totalAmount 支付金额  
 \*/  
public static void enterAlipayInPC(HttpServletResponse response,  
                                   String orderNo, Double totalAmount,String returnUrl,String notifyUrl) {  
    //获得初始化的AlipayClient  
    AlipayClient alipayClient = new DefaultAlipayClient(AliPayConfig.URL, AliPayConfig.APPID, AliPayConfig.RSA\_PRIVATE\_KEY,AliPayConfig.FORMAT, AliPayConfig.CHARSET, AliPayConfig.ALIPAY\_PUBLIC\_KEY, AliPayConfig.SIGNTYPE);  
    //创建API对应的request  
    AlipayTradePagePayRequest alipayRequest = new AlipayTradePagePayRequest();  
    //在公共参数中设置回跳地址  
    //同步跳转链接  
    alipayRequest.setReturnUrl(returnUrl);

    //异步跳转链接  
    alipayRequest.setNotifyUrl(notifyUrl);

    //填充业务数据  
    alipayRequest.setBizContent( "{"  +  
            "    \\"out\_trade\_no\\":\\""+orderNo+"\\","  +  
            "    \\"product\_code\\":\\"FAST\_INSTANT\_TRADE\_PAY\\","  +  
            "    \\"total\_amount\\":"+totalAmount+","  +  
            "    \\"subject\\":\\"订单标题\\","  +  
            "    \\"extend\_params\\":{"  +  
            "    \\"sys\_service\_provider\_id\\":\\"\\""  +  
            "    }" +  
            "  }" );//填充业务参数  
    String form;  
    try {  
        //调用SDK生成表单  
        form = alipayClient.pageExecute(alipayRequest).getBody();  
        response.setContentType("text/html;charset=UTF-8");  
        response.getWriter().write(form);//直接将完整的表单html输出到页面  
        response.getWriter().flush();  
    } catch (Exception e) {  
        e.printStackTrace();  
    }  
}

}

控制器调用方法

AliPayController.java

package com.alipay;

import com.alipay.api.AlipayApiException;
import com.alipay.api.internal.util.AlipaySignature;
import org.apache.commons.lang.StringUtils;
import org.json.JSONObject;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

@Controller
public class AliPayController {

/\*\*  
 \* 支付宝PC支付，  
 \* 这只是简单的demo，需要自行完善逻辑  
 \*/  
@RequestMapping(value = "/aliPCPay")  
public void aliPay(HttpServletResponse response) {

    //订单号  
    String orderNo = "";

    //订单总金额，单位为元，精确到小数点后两位，取值范围\[0.01,100000000\]。  可以参考：https://www.cnblogs.com/pxblog/p/13186037.html  
    Double totalAmount = 1.00;

    AliPay.enterAlipayInPC(response, orderNo, totalAmount,AliPayConfig.returnUrl,AliPayConfig.notifyUrl);  
}

/\*\*  
 \* 支付宝异步通知地址  
 \*  
 \* @return  
 \* @throws IOException  
 \* @throws AlipayApiException  
 \*/  
@RequestMapping(value = "/alipay\_notice")  
public String alipayNotice(HttpServletRequest request, HttpServletResponse response, ModelMap model) throws IOException, AlipayApiException {  
    PrintWriter out = response.getWriter();  
    //获取支付宝POST过来反馈信息  
    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\[i\] + ",";  
        }  
        //乱码解决，这段代码在出现乱码时使用。如果mysign和sign不相等也可以使用这段代码转化  
        //valueStr = new String(valueStr.getBytes("ISO-8859-1"), "gbk");  
        params.put(name, valueStr);  
    }

    System.out.println(new JSONObject(params));

    //获取支付宝的通知返回参数，可参考技术文档中页面跳转同步通知参数列表(以下仅供参考)//  
    //商户订单号  
    String out\_trade\_no = new String(request.getParameter("out\_trade\_no").getBytes("ISO-8859-1"), "UTF-8");  
    //支付宝交易号  
    String trade\_no = new String(request.getParameter("trade\_no").getBytes("ISO-8859-1"), "UTF-8");  
    //交易状态  
    String trade\_status = new String(request.getParameter("trade\_status").getBytes("ISO-8859-1"), "UTF-8");

    //获取支付宝的通知返回参数，可参考技术文档中页面跳转同步通知参数列表(以上仅供参考)//  
    //计算得出通知验证结果  
    String sign = params.get("sign");  
    String content = AlipaySignature.getSignCheckContentV1(params);  
    boolean verify\_result = AlipaySignature.rsaCheck(content,sign, AliPayConfig.ALIPAY\_PUBLIC\_KEY, AliPayConfig.CHARSET,AliPayConfig.SIGNTYPE);

    Order order = orderMng.findByOrderNo(out\_trade\_no);  
    //支付宝交易号  
    order.setTransactionId(trade\_no);  
    String result = "success";  
    System.out.println("订单编号：" + order.getOrderNo());  
    System.out.println("验证结果：" + verify\_result);  
    if (verify\_result) {  
        //验证成功  
        //判断支付宝是否返回付款成功状态  
        if ("TRADE\_SUCCESS".equalsIgnoreCase(trade\_status)){  
            //判断订单状态是否是未支付状态  
            if (!order.getStatus().equals(PayEnums.PAY\_SUCCESS.getCode())) {  
                order.setStatus(PayEnums.PAY\_SUCCESS.getCode());  
                orderMng.update(order);  
            }  
            System.out.println("支付成功");  
        }  
        out.println(result);    //请不要修改或删除  
        out.flush();  
        out.close();  
    } else {  
        //验证失败  
        order.setStatus(PayEnums.PAY\_FAIL.getCode());  
        result = "fail";  
        orderMng.update(order);  
        System.out.println("支付失败");  
        out.println(result);    //请不要修改或删除  
        out.flush();  
        out.close();  
    }  
    return null;  
}

/\*\*  
 \* 支付宝同步通知页面请求  
 \*  
 \* @return  
 \*/  
@RequestMapping(value = "/alipay\_return")  
public String alipayReturn(HttpServletRequest request, ModelMap model) {  
    //跳转到支付结果页  
    Map<String, String> params = new HashMap<String, String>();  
    Map<String, String\[\]> requestParams = request.getParameterMap();  
    for (Iterator<String> 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\[i\] + ",";  
        }  
        //乱码解决，这段代码在出现乱码时使用  
        try {  
            valueStr = new String(valueStr.getBytes("ISO-8859-1"), "utf-8");  
        } catch (UnsupportedEncodingException e) {  
            e.printStackTrace();  
        }  
        params.put(name, valueStr);  
    }

    boolean signVerified = false;  
    try {  
        //调用SDK验证签名

        String sign = params.get("sign");  
        String content = AlipaySignature.getSignCheckContentV1(params);  
        signVerified = AlipaySignature.rsaCheck(content,sign, AliPayConfig.ALIPAY\_PUBLIC\_KEY, AliPayConfig.CHARSET,AliPayConfig.SIGNTYPE);

    } catch (Exception e) {  
        e.printStackTrace();  
    }

    String out\_trade\_no = null;  
    if (signVerified) {  
        //商户订单号  
        try {  
            out\_trade\_no = new String(request.getParameter("out\_trade\_no").getBytes("ISO-8859-1"), "UTF-8");  
        } catch (UnsupportedEncodingException e) {  
            e.printStackTrace();  
        }

    } else {  
        System.out.println("验签失败");

    }

    Order order = new Order();if (StringUtils.isNotBlank(out\_trade\_no)) {  
        order = orderMng.findByOrderNo(out\_trade\_no);  
        if (order != null) {  
            return "成功页面";  
        }  
    }

    return "失败页面";  
}

@Autowired  
private OrderMng orderMng;

}

查询订单支付状态接口
官方文档地址：https://opendocs.alipay.com/apis/api_1/alipay.trade.query/

/**
* 交易查询
* @param out_trade_no 订单号
*/
public static AlipayTradeQueryResponse query(String out_trade_no) {
//获得初始化的AlipayClient
AlipayClient alipayClient = new DefaultAlipayClient(AliPayConfig.URL, AliPayConfig.APPID, AliPayConfig.RSA_PRIVATE_KEY,AliPayConfig.FORMAT, AliPayConfig.CHARSET, AliPayConfig.ALIPAY_PUBLIC_KEY, AliPayConfig.SIGNTYPE);
AlipayTradeQueryRequest alipayQueryRequest = new AlipayTradeQueryRequest();
String biz_content = "{\"out_trade_no\":\"" + out_trade_no + "\"}";
alipayQueryRequest.setBizContent(biz_content);
AlipayTradeQueryResponse alipayQueryResponse = null;
try {
alipayQueryResponse = alipayClient.execute(alipayQueryRequest);

        if (null != alipayQueryResponse && alipayQueryResponse.isSuccess()) {  
            if (alipayQueryResponse.getCode().equals("10000")) {  
                if ("TRADE\_SUCCESS".equalsIgnoreCase(alipayQueryResponse  
                        .getTradeStatus())) {

                    //表示支付成功  
                } else if ("TRADE\_CLOSED".equalsIgnoreCase(alipayQueryResponse  
                        .getTradeStatus())) {  
                    // 表示未付款关闭，或已付款的订单全额退款后关闭  
                } else if ("TRADE\_FINISHED".equalsIgnoreCase(alipayQueryResponse  
                        .getTradeStatus())) {  
                    // 此状态，订单不可退款或撤销  
                }  
            } else {  
                // 如果请求未成功，请重试

            }  
        }  
    } catch (AlipayApiException e) {  
        // TODO Auto-generated catch block  
        e.printStackTrace();  
    }

    return alipayQueryResponse;  
}