支付宝 初步学习
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String paygateway // 支付接口String service // //快速付款交易服务String sign_type = "MD5"; // 签名方式String out_trade_no // 商户网站订单String input_charset = "GBK"; String partner // 支付宝合作伙伴id// (账户内提取)String key // 支付宝安全校验码(账户内提取)String seller_email // 卖家支付宝帐户String extra_common_param="COD2MOTOPAY"; //货单付款返红包字段以上是账户信息，以下是商品信息String payment_type = "1";//支付宝类型.1代表商品购买String subject //商品名称String body // 商品描述，推荐格式：商品名称（订单编号：订单编号)String total_fee // 订单总价String show_url = "";String return_url // 支付完成后跳转返回的网址URLString notify_url // 支付完成后异步通知的网址URLString paymethod = "";//赋值:bankPay(网银);cartoon(卡通); directPay(余额)//三种付款方式都要，参数为空String defaultbank = "";
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//paygateway 的值为： https://www.alipay.com/cooperate/gateway.do? public static String CreateUrl(String paygateway, String service,String sign_type, String out_trade_no, String input_charset,String partner, String key, String show_url, String body,String total_fee, String payment_type, String seller_email,String subject, String notify_url, String return_url,String paymethod, String defaultbank,String token) {Map<String, String> params = new HashMap<String, String>();params.put("service", service);params.put("partner", partner);params.put("subject", subject);params.put("body", body);params.put("out_trade_no", out_trade_no);params.put("total_fee", total_fee);params.put("show_url", show_url);params.put("payment_type", payment_type);params.put("seller_email", seller_email);params.put("return_url", return_url);params.put("notify_url", notify_url);params.put("_input_charset", input_charset);params.put("paymethod", paymethod);params.put("defaultbank", defaultbank);if(token!=null){params.put("token", token);}String prestr = "";prestr = prestr + key;//System.out.println("prestr=" + prestr);String sign = com.homevv.cps.alipay.util.Md5Encrypt.md5(getContent(params, key));String parameter = "";parameter = parameter + paygateway;//System.out.println("prestr=" + parameter);List<String> keys = new ArrayList<String>(params.keySet());for (int i = 0; i < keys.size(); i++) {String value = params.get(keys.get(i));if (value == null || value.trim().length() == 0) {continue;}try {parameter = parameter + keys.get(i) + "="+ URLEncoder.encode(value, input_charset) + "&";} catch (UnsupportedEncodingException e) {e.printStackTrace();}}parameter = parameter + "sign=" + sign + "&sign_type=" + sign_type;return parameter;}private static String getContent(Map<String, String> params, String privateKey) {List<String> keys = new ArrayList<String>(params.keySet());Collections.sort(keys);String prestr = "";boolean first = true;for (int i = 0; i < keys.size(); i++) {String key = keys.get(i);String value = params.get(key);if (value == null || value.trim().length() == 0) {continue;}if (first) {prestr = prestr + key + "=" + value;first = false;} else {prestr = prestr + "&" + key + "=" + value;}}return prestr + privateKey;}?
完整的：
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package two;import java.io.UnsupportedEncodingException;import java.net.URLEncoder;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;import java.util.ArrayList;import java.util.Collections;import java.util.HashMap;import java.util.List;import java.util.Map;public class a1 {// paygateway 的值为： https://www.alipay.com/cooperate/gateway.do?private static final char[] DIGITS = { '0', '1', '2', '3', '4', '5', '6','7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };public static void main(String[] args) {String s = CreateUrl("https://www.alipay.com/cooperate/gateway.do?", "create_direct_pay_by_user", "MD5", "D130118960597", "GBK", "2088301328367423", "3lemaoraz4f8brjeaifdonhok7kwm3da", "", "订单编号", "0.1", "1", "790177486@qq.com", "测试。。。等等", "", "", "directPay", "BOCB2C", null);System.out.println(s);}public static String CreateUrl(String paygateway, String service,String sign_type, String out_trade_no, String input_charset,String partner, String key, String show_url, String body,String total_fee, String payment_type, String seller_email,String subject, String notify_url, String return_url,String paymethod, String defaultbank, String token) {Map<String, String> params = new HashMap<String, String>();params.put("service", service);params.put("partner", partner);params.put("subject", subject);params.put("body", body);params.put("out_trade_no", out_trade_no);params.put("total_fee", total_fee);params.put("show_url", show_url);params.put("payment_type", payment_type);params.put("seller_email", seller_email);params.put("return_url", return_url);params.put("notify_url", notify_url);params.put("_input_charset", input_charset);params.put("paymethod", paymethod);params.put("defaultbank", defaultbank);if (token != null) {params.put("token", token);}String prestr = "";prestr = prestr + key;// System.out.println("prestr=" + prestr);String sign = md5(getContent(params, key));String parameter = "";parameter = parameter + paygateway;// System.out.println("prestr=" + parameter);List<String> keys = new ArrayList<String>(params.keySet());for (int i = 0; i < keys.size(); i++) {String value = params.get(keys.get(i));if (value == null || value.trim().length() == 0) {continue;}try {parameter = parameter + keys.get(i) + "="+ URLEncoder.encode(value, input_charset) + "&";} catch (UnsupportedEncodingException e) {e.printStackTrace();}}parameter = parameter + "sign=" + sign + "&sign_type=" + sign_type;return parameter;}private static String getContent(Map<String, String> params,String privateKey) {List<String> keys = new ArrayList<String>(params.keySet());Collections.sort(keys);String prestr = "";boolean first = true;for (int i = 0; i < keys.size(); i++) {String key = keys.get(i);String value = params.get(key);if (value == null || value.trim().length() == 0) {continue;}if (first) {prestr = prestr + key + "=" + value;first = false;} else {prestr = prestr + "&" + key + "=" + value;}}return prestr + privateKey;}public static String md5(String text) {MessageDigest msgDigest = null;try {msgDigest = MessageDigest.getInstance("MD5");} catch (NoSuchAlgorithmException e) {throw new IllegalStateException("System doesn't support MD5 algorithm.");}try {msgDigest.update(text.getBytes("GBK"));} catch (UnsupportedEncodingException e) {throw new IllegalStateException("System doesn't support your EncodingException.");}byte[] bytes = msgDigest.digest();String md5Str = new String(encodeHex(bytes));return md5Str;}public static char[] encodeHex(byte[] data) {int l = data.length;char[] out = new char[l << 1];// two characters form the hex value.for (int i = 0, j = 0; i < l; i++) {out[j++] = DIGITS[(0xF0 & data[i]) >>> 4];out[j++] = DIGITS[0x0F & data[i]];}return out;}}?