AlipayHandler.java

package me.xhh.alipay;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import me.xhh.alipay.config.AlipayConfig;
import me.xhh.alipay.util.AlipayBase;
import me.xhh.alipay.util.AlipayNotify;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class AlipayHandler {

	private HttpServletRequest request;
	private HttpServletResponse response;

	private String trade_no;
	@SuppressWarnings("unused")
	private String extra_value;
	private String total_fee;
	private String subject;
	private String buyer_email;
	private String trade_status;

	private static final Logger log = LoggerFactory.getLogger(AlipayHandler.class);

	public AlipayHandler(HttpServletRequest req, HttpServletResponse resp) {
		this.request = req;
		this.response = resp;
	}

	public void process() throws IOException {
		boolean result = verify() && handle();
		PrintWriter out = response.getWriter();
		out.println(result ? "success" : "fail");
	}

	@SuppressWarnings("unchecked")
	private boolean verify() throws IOException {
		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 = iter.next();
			String[] values = 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"), "UTF-8");
			params.put(name, valueStr);
		}

		String mysign = AlipayNotify.GetMysign(params, AlipayConfig.key);
		String sign = request.getParameter("sign");

		Object[] logArgs = {AlipayBase.CreateLinkString(params), sign, mysign};
		log.info("Alipay notification got. Arguments: {}\nSign: {}\nMy sign: {}", logArgs);

		// verify with Alipay
		String responseTxt = AlipayNotify.Verify(request.getParameter("notify_id"));
		log.info("Alipay verify-result: {}", responseTxt);

		boolean verified = (mysign.equals(sign) && responseTxt.equals("true"));
		if (!verified) {
			log.error("Alipay handling failed! Not verified!");
			return false;
		}

		// verification succeeded
		// 获取支付宝的通知返回参数
		trade_no = request.getParameter("trade_no"); // 支付宝交易号
		extra_value = request.getParameter("extra_common_param"); // 获取 extra_common_param 的值
		total_fee = request.getParameter("total_fee"); // 获取总金额
		//		subject = new String(request.getParameter("subject").getBytes("ISO-8859-1"), "UTF-8");// 商品名称、订单名称 encoding problem
		subject = request.getParameter("subject");// 商品名称、订单名称
		//		body = new String(request.getParameter("body").getBytes("ISO-8859-1"), "UTF-8");// 商品描述、订单备注、描述
		buyer_email = request.getParameter("buyer_email"); // 买家支付宝账号
		trade_status = request.getParameter("trade_status"); // 交易状态

		return true;
	}

	/**
	 * @return true for writing "success" back, false for "fail"
	 */
	private boolean handle() {
		String[] logArgs = {trade_no, buyer_email, total_fee, subject};
		log.info("Alipay handling... trade_no: {}, buyer_email: {}, total_fee: {}, subject: {}", logArgs);

		// payment status not expected
		if (!trade_status.equals("TRADE_FINISHED") && !trade_status.equals("TRADE_SUCCESS")) {
			log.info("Alipay notification skipped. Payment status: {}", trade_status);
			return true;
		}

		/* Example processing
		if (isTransactionAlreadyProcessed()) {
			log.warn("Alipay transaction already processed before, exit.");
			return true;
		}

		boolean result = addFunds();
		if (!result) {
			log.error("Alipay handling failed! Remove the transaction ID from database...");
			removeTransactionID();
		} else {
			log.info("Alipay handling completed.");
		}

		return result;
		 */
		return false;
	}

}