1.集成支付寶sdk

		com.alipay.sdk
		alipay-sdk-java
		3.7.26.ALL

2.創(chuàng)建一個輔助類，生成支付寶支付簽名與驗證簽名

package com.demo.test.utils;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import com.alipay.api.AlipayApiException;
import com.alipay.api.AlipayClient;
import com.alipay.api.DefaultAlipayClient;
import com.alipay.api.domain.AlipayTradeAppPayModel;
import com.alipay.api.internal.util.AlipaySignature;
import com.alipay.api.request.AlipayTradeAppPayRequest;
import com.alipay.api.response.AlipayTradeAppPayResponse;
public class AlipayUtils{
//請求網(wǎng)關(guān)地址
private static final String GATEWAY_URL="https://openapi.alipay.com/gateway.do";
//appid
private static final String APP_ID="創(chuàng)建的應(yīng)用id";
//應(yīng)用私鑰pkcs8
private static final String APP_PRIVATE_KEY="應(yīng)用私鑰";
//支付寶公鑰
private static final String ALIPAY_PUBLIC_KEY="支付寶公鑰";//支付寶公鑰
/**
*支付寶訂單生成
*@paramorderno訂單號
*@paramtitle商品名稱
*@paramdesc商品描述
*@parampaymoney支付金額
*@paramnotifyUrl回調(diào)地址
*@return
*/
public String getOrderSignString(String orderno,String title,String desc,String paymoney,String notifyUrl){
//實例化客戶端
AlipayClientali payClient=new DefaultAlipayClient(GATEWAY_URL,APP_ID,APP_PRIVATE_KEY,"json","UTF-8",ALIPAY_PUBLIC_KEY,"RSA2");
//實例化具體API對應(yīng)的request類,類名稱和接口名稱對應(yīng),當(dāng)前調(diào)用接口名稱：alipay.trade.app.pay
AlipayTradeAppPayRequest request=new AlipayTradeAppPayRequest();
//SDK已經(jīng)封裝掉了公共參數(shù)，這里只需要傳入業(yè)務(wù)參數(shù)。以下方法為sdk的model入?yún)⒎绞?model和biz_content同時存在的情況下取biz_content)。
AlipayTradeAppPayModel model=new AlipayTradeAppPayModel();
model.setBody(desc);
model.setSubject(title);
model.setOutTradeNo(orderno);
model.setTimeoutExpress("30m");
model.setTotalAmount(paymoney);
model.setProductCode("QUICK_MSECURITY_PAY");
request.setBizModel(model);
request.setNotifyUrl(notifyUrl);
try{
//這里和普通的接口調(diào)用不同，使用的是sdkExecute
AlipayTradeAppPayResponse response=alipayClient.sdkExecute(request);
//System.out.println(response.getBody());//就是orderString可以直接給客戶端請求，無需再做處理。
return response.getBody();
}catch(AlipayApiExceptione){
e.printStackTrace();
System.out.print("生成簽名異常:"+e.getErrMsg());
}catch(Exceptionex){
ex.printStackTrace();
System.out.print("生成簽名異常01:"+ex.getMessage());
}
return"";
}
public boolean verifySign(Map requestParams){
try{
//獲取支付寶POST過來反饋信息
Map params=new HashMap();
			//MaprequestParams=request.getParameterMap();
			for(Iteratoriter=requestParams.keySet().iterator();iter.hasNext();){
			Stringname=(String)iter.next();
			String[]values=(String[])requestParams.get(name);
			StringvalueStr="";
			for(inti=0;i			valueStr=(i==values.length-1)?valueStr+values[i]
			:valueStr+values[i]+",";
				}
			//亂碼解決，這段代碼在出現(xiàn)亂碼時使用。
				//valueStr=newString(valueStr.getBytes("ISO-8859-1"),"utf-8");
				params.put(name,valueStr);
			}
			//切記alipaypublickey是支付寶的公鑰，請去open.alipay.com對應(yīng)應(yīng)用下查看。
			//booleanAlipaySignature.rsaCheckV1(Mapparams,StringpublicKey,Stringcharset,Stringsign_type)
			booleanflag=AlipaySignature.rsaCheckV1(params,ALIPAY_PUBLIC_KEY,"UTF-8","RSA2");
			
			returnflag;
		}catch(Exceptione){
			e.printStackTrace();
			returnfalse;
			
		}
		
	}
}

3.測試生成支付簽名，調(diào)用支付寶

AlipayUtils alipay=new AlipayUtils();
String payInfo=alipay.getOrderSignString("20191351245451","充值10元","錢包充值","10","http://localhost:8080/notify/alipay");

獲取的payInfo值可以app端調(diào)用支付寶進行支付

4.支付寶回調(diào)驗證

package com.demo.test.controller;
import java.math.BigDecimal;
import java.util.Date;
import java.util.Map;
import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import com.demo.test.utils.AlipayUtils;
//支付寶回調(diào)
@RestController
@RequestMapping("/notify")
public class AlipayNotifyController{
	
	private static final Logger log=LoggerFactory.getLogger(AlipayNotifyController.class);
	
	@Resource
	private HttpServletRequest request;
	
	
	@ResponseBody
	@RequestMapping(value="/alipay",method=RequestMethod.POST,produces=MediaType.TEXT_PLAIN_VALUE)
	public String notify(@RequestBody String requestStr,@RequestParam Map params){
		try{
			log.info("支付寶回調(diào)請求內(nèi)容："+requestStr);
			AlipayUtils alipay=new AlipayUtils();
 if(alipay.verifySign(request.getParameterMap())){
 return"success";
 }
 			
 			return"fail";
 		}catch(Exceptione){
 			e.printStackTrace();
 			log.error("支付轉(zhuǎn)化失敗:{}",e);
 			return"fail";
 		}
 	}
 }