Java开发支付宝PC支付完整版

一：准备工作

1：如没有账号的请先去 支付宝商户平台 注册商户号

2：开发前需要导入支付宝SDK 支付宝SDK下载链接 Maven依赖也在里面

3：生成支付宝密钥、公钥，需要用到支付宝密钥生成工具 密钥生成工具下载链接 ，密钥用于签名使用

4：电脑网站支付结果异步通知（关于支付结果异步通知后续会专门写一个博客，需要重点注意）

注意：请先详细查看官方文档按步骤开发，一切以官方文档为主 支付宝官方开发文档，如使用老接口请移步 老版即时到账文档

5：测试的时候一定要使用内网穿透软件，否则会报错

二：开发代码

博主使用的是沙箱环境，正式上线时请将环境改为正式环境

AlipayConfig：

public class AlipayConfig {
  public static String APPID = "";

  //用支付宝密钥生成工具生成的私钥
  public static String RSA_PRIVATE_KEY = "";

  //电脑网站支付结果异步通知，可以参考异步文档，一定要是外网能访问的
  public static String notify_url = ""; 

  //电脑网站支付结果同步通知，用于转跳到用户自己的页面，一定要是外网能访问的
  public static String return_url = ""; 

  //沙箱接口，正式上线时请改用正式支付接口
  public static String URL = "https://openapi.alipaydev.com/gateway.do";
  public static String CHARSET = "UTF-8";
  public static String FORMAT = "json";

  //用支付宝密钥生成工具生成的公钥
  public static String ALIPAY_PUBLIC_KEY = "";
  public static String log_path = "/log";
  public static String SIGNTYPE = "RSA2";

  public AlipayConfig() {
  }
}

AlipayService：

public interface AlipayService {
  public String toAlipay(Map<String, String> sourceMap) throws IOException;
}

AlipayServiceImpl：

@Service
public class AlipayServiceImpl implements AlipayService {

  @Override
  public String toAlipay(Map<String, String> sourceMap) throws IOException {
    AlipayClient alipayClient = new DefaultAlipayClient(AlipayConfig.URL,AlipayConfig.APPID,AlipayConfig.RSA_PRIVATE_KEY,AlipayConfig.FORMAT,AlipayConfig.CHARSET,AlipayConfig.ALIPAY_PUBLIC_KEY,AlipayConfig.SIGNTYPE);
    AlipayTradePagePayRequest alipayRequest = new AlipayTradePagePayRequest();
    alipayRequest.setReturnUrl(AlipayConfig.return_url);
    alipayRequest.setNotifyUrl(AlipayConfig.notify_url);
    AlipayTradeWapPayModel alipayTradeWapPayModel = new AlipayTradeWapPayModel();
    alipayTradeWapPayModel.setOutTradeNo(sourceMap.get("out_trade_no"));
    alipayTradeWapPayModel.setProductCode("FAST_INSTANT_TRADE_PAY");
    alipayTradeWapPayModel.setTotalAmount(sourceMap.get("total_amount"));
    alipayTradeWapPayModel.setSubject("Alipay");
    alipayTradeWapPayModel.setBody(sourceMap.get("body"));
    alipayRequest.setBizModel(alipayTradeWapPayModel);
    String form="";
    try {
      form = alipayClient.pageExecute(alipayRequest).getBody();
    } catch (AlipayApiException e) {
      e.printStackTrace();
    }
    return form;
  }

}

AlipayController：

@Controller
public class AlipayController {

  @Autowired
  public AlipayService alipayService;

  @RequestMapping("pay")
  public void toAlipay(HttpServletRequest httpRequest , HttpServletResponse httpResponse, String payId, String totalFee, String body) throws IOException {

    //生成一笔支付记录，支付完成时将支付状态改为成功

    Map<String, String> sourceMap = new HashMap<>();
    sourceMap.put("out_trade_no",payId);
    sourceMap.put("total_amount",totalFee);
    sourceMap.put("body",getUTF8XMLString(body));

    String form = alipayService.toAlipay(sourceMap);
    httpResponse.setContentType("text/html;charset=" + AlipayConfig.CHARSET);
    httpResponse.getWriter().write(form);
    httpResponse.getWriter().flush();
    httpResponse.getWriter().close();
  }

  //注意异步返回结果通知是以post请求形式返回的
  @RequestMapping("notifyUrl")
  public String notify_url(HttpServletRequest request){
    Map<String, String> paramsMap = convertRequestParamsToMap(request);
    String out_trade_no= paramsMap.get("out_trade_no");
    try {
      boolean signVerified = AlipaySignature.rsaCheckV1(paramsMap, AlipayConfig.ALIPAY_PUBLIC_KEY, AlipayConfig.CHARSET, AlipayConfig.SIGNTYPE);
      //无论同步异步都要验证签名
      if(signVerified){
        if(trade_status.equals("TRADE_FINISHED") || trade_status.equals("TRADE_SUCCESS")){
          //处理自己系统的业务逻辑，如：将支付记录状态改为成功，需要返回一个字符串success告知支付宝服务器

          return "success";
        } else {
          //支付失败不处理业务逻辑
          return "failure";
        }
      }else {
        //签名验证失败不处理业务逻辑
        return "failure";
      }
    } catch (AlipayApiException e) {
      e.printStackTrace();
      return "failure";
    }
  }

  //注意同步返回结果是以get请求形式返回的
  @RequestMapping("returnUrl")
  public String return_url(HttpServletRequest request){
    Map<String, String> paramsMap = convertRequestParamsToMap(request);
    try {
      boolean signVerified = AlipaySignature.rsaCheckV1(paramsMap, AlipayConfig.ALIPAY_PUBLIC_KEY, AlipayConfig.CHARSET, AlipayConfig.SIGNTYPE);
      if(signVerified){
        //跳转支付成功界面
        return "支付成功页面";

      }else {
        //跳转支付失败界面
        return "failure";
      }
    } catch (AlipayApiException e) {
      e.printStackTrace();
    }
    return "success";
  }

  //将请求中的参数转换为Map
  public static Map<String, String> convertRequestParamsToMap(HttpServletRequest request) {
    Map<String, String> retMap = new HashMap();
    Set<Entry<String, String[]>> entrySet = request.getParameterMap().entrySet();
    Iterator var3 = entrySet.iterator();

    while(true) {
      while(var3.hasNext()) {
        Entry<String, String[]> entry = (Entry)var3.next();
        String name = (String)entry.getKey();
        String[] values = (String[])entry.getValue();
        int valLen = values.length;
        if(valLen == 1) {
          retMap.put(name, values[0]);
        } else if(valLen <= 1) {
          retMap.put(name, "");
        } else {
          StringBuilder sb = new StringBuilder();
          String[] var9 = values;
          int var10 = values.length;

          for(int var11 = 0; var11 < var10; ++var11) {
            String val = var9[var11];
            sb.append(",").append(val);
          }

          retMap.put(name, sb.toString().substring(1));
        }
      }

      return retMap;
    }
  }

  //将字符串转换为UTF-8编码以防出现乱码错误
  public static String getUTF8XMLString(String xml) {
    StringBuffer sb = new StringBuffer();
    sb.append(xml);
    String xmString = "";
    String xmlUTF8="";
    try {
      xmString = new String(sb.toString().getBytes("UTF-8"));
      xmlUTF8 = URLEncoder.encode(xmString, "UTF-8");
    } catch (UnsupportedEncodingException e) {
      e.printStackTrace();
    }
    return xmlUTF8;
  }
}

至此代码已经完成！！！

三：演示结果

注意：扫码或者登陆账户时如果用的是沙箱开发环境请使用沙盒支付宝APP扫码，或者使用沙盒账户支付，否则会弹出码已失效错误

支付宝沙箱

支付成功页面是从支付结果同步通知controller中跳转的，后续会更新最详细最完整的微信Navicat支付跟PayPal支付，有兴趣请关注博主

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