Java调用支付宝支付接口
这是一个简单的java调用支付宝支付接口的例子，代码较为原始，采用jsp+servlet模式，可根据业务场景项目框架稍做更改。
应用环境：沙箱（入驻开发不需要营业执照，但正式线上不可使用，下载沙箱支付宝进行测试），pc端支付（手机端略有不同）
前期工作：配置好沙箱环境（官方文档），关于私钥，公钥，以及验证算法等名词详见官方文档，下载沙箱板支付宝app，官方会提供一个测试账号。
案例结构：
直接贴代码（有些官方demo稍做更改可直接复制使用）：
AlipayConfig.java:
package com.alipay.config;
import java.io.FileWriter;
import java.io.IOException;
/* *
*类名：AlipayConfig
*功能：基础配置类
*详细：设置帐户有关信息及返回路径
*修改日期：2017-04-05
*说明：
*以下代码只是为了方便商户测试而提供的样例代码，商户可以根据自己网站的需要，按照技术文档编写,并非一定要使用该代码。
*该代码仅供学习和研究支付宝接口使用，只是提供一个参考。
*/
public class AlipayConfig {
//↓↓↓↓↓↓↓↓↓↓请在这里配置您的基本信息↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓
// 应用ID,您的APPID，收款账号既是您的APPID对应支付宝账号
public static String app_id = "2016091000482028";
// 商户私钥，您的PKCS8格式RSA2私钥
public static String merchant_private_key = "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";
// 支付宝公钥,查看地址：https://openhome.alipay.com/platform/keyManage.htm 对应APPID下的支付宝公钥。
public static String alipay_public_key = "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAyrCb/E84SZePt87PZhpdY6H2OlyHIUTlClAneKk/tn6LfhaAMLYE8xHDi4ZdwcYi8kYhZ0dscz4FwVAdEgO3nN56U5lpC88SJYV7+fQn0n2hj6Dlp4z7pKUSCljt3YZDNYRh3NHviDDR3QTSadOqbRxoCxQ3PRCzGMN6sojWWVKmCxXkgyMNvSkFgWerPsv7imkr2a8gzOaYyDcbjco1P7W2H7IBtIuk5JF9DMkXp0cseuGFsVhXxUfQHiOgTJl9MB/XV+/V2S94Q8sCFzj5OvhAqkJAPQWMwuECfhqEl8LE9QRvjbxkne9VWeM3Ce3bzHO4cg8OAECYGptMWfz9wQIDAQAB";
// 服务器异步通知页面路径 需http://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 = "http://工程公网访问地址/alipay.trade.page.pay-JAVA-UTF-8/notify_url.jsp";
// 页面跳转同步通知页面路径 需http://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 return_url = "http://工程公网访问地址/alipay.trade.page.pay-JAVA-UTF-8/return_url.jsp";
// 签名方式
public static String sign_type = "RSA2";
// 字符编码格式
public static String charset = "utf-8";
// 支付宝网关
public static String gatewayUrl = "https://openapi.alipaydev.com/gateway.do";
// 支付宝网关
public static String log_path = "C:\\";
//↑↑↑↑↑↑↑↑↑↑请在这里配置您的基本信息↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑
/**
* 写日志，方便测试（看网站需求，也可以改成把记录存入数据库）
* @param sWord 要写入日志里的文本内容
*/
public static void logResult(String sWord) {
FileWriter writer = null;
try {
writer = new FileWriter(log_path + "alipay_log_" + System.currentTimeMillis()+".txt");
writer.write(sWord);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (writer != null) {
try {
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
AlipayServlet.java:
package com.alipay.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.alipay.util.AlipayUtil;
public class AlipayServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//商户订单号，商户网站订单系统中唯一订单号，必填
String orderId = new String(request.getParameter("WIDout_trade_no").getBytes("ISO-8859-1"),"UTF-8");
//付款金额，必填
String money = new String(request.getParameter("WIDtotal_amount").getBytes("ISO-8859-1"),"UTF-8");
//订单名称，必填
String name = new String(request.getParameter("WIDsubject").getBytes("ISO-8859-1"),"UTF-8");
//商品描述，可空
String info = new String(request.getParameter("WIDbody").getBytes("ISO-8859-1"),"UTF-8");
try {
String result = AlipayUtil.pay(response, money, info, name, orderId);
request.setAttribute("result", result);
System.out.println(result);
} catch (Exception e) {
e.printStackTrace();
}
request.getRequestDispatcher("/hello.jsp").forward(request,response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doGet(request, response);
}
}
AlipayUtil.java:
package com.alipay.util;
import javax.servlet.http.HttpServletResponse;
import com.alipay.api.AlipayClient;
import com.alipay.api.DefaultAlipayClient;
import com.alipay.api.request.AlipayTradePagePayRequest;
import com.alipay.config.AlipayConfig;
public class AlipayUtil {
public static String pay(HttpServletResponse response,String money,String info,String name,String orderId) throws Exception{
//获得初始化的AlipayClient
AlipayClient alipayClient = new DefaultAlipayClient(AlipayConfig.gatewayUrl, AlipayConfig.app_id, AlipayConfig.merchant_private_key, "json", AlipayConfig.charset, AlipayConfig.alipay_public_key, AlipayConfig.sign_type);
//设置请求参数
AlipayTradePagePayRequest alipayRequest = new AlipayTradePagePayRequest();
alipayRequest.setReturnUrl(AlipayConfig.return_url);
alipayRequest.setNotifyUrl(AlipayConfig.notify_url);
/*AlipayTradeAppPayModel model = new AlipayTradeAppPayModel();
model.setBody(name); //名称
model.setSubject(info); //描述
model.setOutTradeNo(orderId);//订单id
model.setTimeoutExpress("30m"); //描述
model.setTotalAmount(money); //金额
//model.setPassbackParams( "2" );
model.setProductCode("FAST_INSTANT_TRADE_PAY");
alipayRequest.setBizModel(model);
alipayRequest.setNotifyUrl(AlipayConfig.notify_url);*/
/*//商户订单号，商户网站订单系统中唯一订单号，必填
String out_trade_no = new String(request.getParameter("WIDout_trade_no").getBytes("ISO-8859-1"),"UTF-8");
//付款金额，必填
String total_amount = new String(request.getParameter("WIDtotal_amount").getBytes("ISO-8859-1"),"UTF-8");
//订单名称，必填
String subject = new String(request.getParameter("WIDsubject").getBytes("ISO-8859-1"),"UTF-8");
//商品描述，可空
String body = new String(request.getParameter("WIDbody").getBytes("ISO-8859-1"),"UTF-8");*/
alipayRequest.setBizContent("{\"out_trade_no\":\""+ orderId +"\","
+ "\"total_amount\":\""+ money +"\","
+ "\"subject\":\""+ name +"\","
+ "\"body\":\""+ info +"\","
+ "\"product_code\":\"FAST_INSTANT_TRADE_PAY\"}");
//若想给BizContent增加其他可选请求参数，以增加自定义超时时间参数timeout_express来举例说明
//alipayRequest.setBizContent("{\"out_trade_no\":\""+ out_trade_no +"\","
// + "\"total_amount\":\""+ total_amount +"\","
// + "\"subject\":\""+ subject +"\","
// + "\"body\":\""+ body +"\","
// + "\"timeout_express\":\"10m\","
// + "\"product_code\":\"FAST_INSTANT_TRADE_PAY\"}");
//请求参数可查阅【电脑网站支付的API文档-alipay.trade.page.pay-请求参数】章节
//请求
String result = alipayClient.pageExecute(alipayRequest).getBody();
//返回
return result;
}
}
hello.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
Insert title here
${result }
index.jsp：（官方demo,只修改了form表单里的action让其跳转到后台，代码较长就不贴了）
web.xml：配置下servlet请求即可。
点击付款，跳转至支付宝支付页面
使用沙箱版支付宝登录官方提供的账号进行扫一扫付款，可能输入交易密码时系统会出错，多试几次。
支付成功后会跳转至预先设定的页面，在config.java里面：
需要是部署到服务器的项目url（外网能访问到的）。
查询，退款等代码类似，再次就不一一列举了。