public class AlipayConfig {
 public static String APPID = "";
 
 //用支付寶密鑰生成工具生成的私鑰
 public static String RSA_PRIVATE_KEY = "";
 
 //電腦網(wǎng)站支付結(jié)果異步通知，可以參考異步文檔，一定要是外網(wǎng)能訪問的
 public static String notify_url = ""; 
 
 //電腦網(wǎng)站支付結(jié)果同步通知，用于轉(zhuǎn)跳到用戶自己的頁面，一定要是外網(wǎng)能訪問的
 public static String return_url = ""; 
 
 //沙箱接口，正式上線時請改用正式支付接口
 public static String URL = "https://openapi.alipaydev.com/gateway.do"; 
 public static String CHARSET = "UTF-8";
 public static String FORMAT = "json";
 
 //用支付寶密鑰生成工具生成的公鑰
 public static String ALIPAY_PUBLIC_KEY = "";
 public static String log_path = "/log";
 public static String SIGNTYPE = "RSA2";
 
 public AlipayConfig() {
 }
}

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

@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;
 }
 
}

@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 {
 
  //生成一筆支付記錄，支付完成時將支付狀態(tài)改為成功
 
 
  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();
 }
 
 
 //注意異步返回結(jié)果通知是以post請求形式返回的
 @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);
   //無論同步異步都要驗證簽名
   if(signVerified){
    if(trade_status.equals("TRADE_FINISHED") || trade_status.equals("TRADE_SUCCESS")){
     //處理自己系統(tǒng)的業(yè)務邏輯，如：將支付記錄狀態(tài)改為成功，需要返回一個字符串success告知支付寶服務器
     
     return "success";
    } else {
     //支付失敗不處理業(yè)務邏輯
     return "failure";
    }
   }else {
    //簽名驗證失敗不處理業(yè)務邏輯
    return "failure";
   }
  } catch (AlipayApiException e) {
   e.printStackTrace();
   return "failure";
  }
 }
 
 //注意同步返回結(jié)果是以get請求形式返回的
 @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){
    //跳轉(zhuǎn)支付成功界面
    return "支付成功頁面";
 
   }else {
    //跳轉(zhuǎn)支付失敗界面
    return "failure";
   }
  } catch (AlipayApiException e) {
   e.printStackTrace();
  }
  return "success";
 }
 
 
 //將請求中的參數(shù)轉(zhuǎn)換為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;
  }
 }
 
 //將字符串轉(zhuǎn)換為UTF-8編碼以防出現(xiàn)亂碼錯誤
 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;
 }
}