引荐课程：Java教程。
空话不多说，直接上代码：
PayController
@Api(tags = "付出模块")
@RestController
@RequestMapping("")
public class PayController {
@ApiOperation(value = "要求付出接口")
@RequestMapping(value = "/wxPay", method = RequestMethod.POST)
public JSONObject wxPay(HttpServletRequest request) { try { //生成的随机字符串
String nonce_str = getRandomStringByLength(32); //商品名称
String body = "测试商品名称"; //猎取客户端的ip地点
String spbill_create_ip = getIpAddr(request); //组装参数，用户生成一致下单接口的署名
Map<String, String> packageParams = new HashMap<>();
packageParams.put("appid", WechatConfig.appid);
packageParams.put("mch_id", WechatConfig.mch_id);
packageParams.put("nonce_str", nonce_str);
packageParams.put("body", body);
packageParams.put("out_trade_no", payOrderId + "");//商户定单号,本身的定单ID
packageParams.put("total_fee", 100 + "");//付出金额，这边须要转成字符串范例，不然背面的署名会失利
packageParams.put("spbill_create_ip", spbill_create_ip);
packageParams.put("notify_url", WechatConfig.notify_url);//付出胜利后的回调地点
packageParams.put("trade_type", WechatConfig.TRADETYPE);//付出体式格局
packageParams.put("openid", openId + "");//用户的openID，本身猎取
String prestr = PayUtil.createLinkString(packageParams); // 把数组一切元素，依据“参数=参数值”的形式用“&”字符拼接成字符串
//MD5运算生成署名，这里是第一次署名，用于挪用一致下单接口
String mysign = PayUtil.sign(prestr, WechatConfig.key, "utf-8").toUpperCase(); //拼接一致下单接口运用的xml数据，要将上一步生成的署名一同拼接进去
String xml = "<xml>" + "<appid>" + WechatConfig.appid + "</appid>"
+ "<body><![CDATA[" + body + "]]></body>"
+ "<mch_id>" + WechatConfig.mch_id + "</mch_id>"
+ "<nonce_str>" + nonce_str + "</nonce_str>"
+ "<notify_url>" + WechatConfig.notify_url + "</notify_url>"
+ "<openid>" + openid + "</openid>"
+ "<out_trade_no>" + payOrderId + "</out_trade_no>"
+ "<spbill_create_ip>" + spbill_create_ip + "</spbill_create_ip>"
+ "<total_fee>" + 100 + "</total_fee>"//付出的金额，单元：分
+ "<trade_type>" + WechatConfig.TRADETYPE + "</trade_type>"
+ "<sign>" + mysign + "</sign>"
+ "</xml>"; //挪用一致下单接口，并接收返回的效果
String result = PayUtil.httpRequest(WechatConfig.pay_url, "POST", xml); // 将剖析效果存储在HashMap中
Map map = PayUtil.doXMLParse(result); String return_code = (String) map.get("return_code");//返回状况码
String result_code = (String) map.get("result_code");//返回状况码
Map<String, Object> response = new HashMap<String, Object>();//返回给小顺序端须要的参数
if (return_code == "SUCCESS" && return_code.equals(result_code)) { String prepay_id = (String) map.get("prepay_id");//返回的预支单信息
response.put("nonceStr", nonce_str);
response.put("package", "prepay_id=" + prepay_id);
Long timeStamp = System.currentTimeMillis() / 1000;
response.put("timeStamp", timeStamp + "");//这边要将返回的时刻戳转化成字符串，不然小顺序端挪用wx.requestPayment要领会报署名毛病
//拼接署名须要的参数
String stringSignTemp = "appId=" + WechatConfig.appid + "&nonceStr=" + nonce_str + "&package=prepay_id=" + prepay_id + "&signType=MD5&timeStamp=" + timeStamp; //再次署名，这个署名用于小顺序端挪用wx.requesetPayment要领
String paySign = PayUtil.sign(stringSignTemp, WechatConfig.key, "utf-8").toUpperCase();
response.put("paySign", paySign);
}
response.put("appid", WechatConfig.appid); return Response.succ(response);
} catch (Exception e) {
e.printStackTrace();
} return null;
} //这里是付出回调接口，微信付出胜利后会自动挪用
@RequestMapping(value = "/wxNotify", method = RequestMethod.POST)
public void wxNotify(HttpServletRequest request, HttpServletResponse response) throws Exception {
BufferedReader br = new BufferedReader(new InputStreamReader(request.getInputStream())); String line = null;
StringBuilder sb = new StringBuilder(); while ((line = br.readLine()) != null) {
sb.append(line);
}
br.close(); //sb为微信返回的xml
String notityXml = sb.toString(); String resXml = ""; Map map = PayUtil.doXMLParse(notityXml); String returnCode = (String) map.get("return_code"); if ("SUCCESS".equals(returnCode)) { //考证署名是不是准确
Map<String, String> validParams = PayUtil.paraFilter(map); //回调验签时须要去除sign和空值参数
String prestr = PayUtil.createLinkString(validParams);
//依据微信官网的引见，此处不仅对回调的参数举行验签，还须要对返回的金额与体系定单的金额举行比对等
if (PayUtil.verify(prestr, (String) map.get("sign"), WechatConfig.key, "utf-8")) { /**此处增加本身的营业逻辑代码start**/
//注重要推断微信付出反复回调，付出胜利后微信会反复的举行回调
/**此处增加本身的营业逻辑代码end**/
//关照微信服务器已付出胜利
resXml = "<xml>" + "<return_code><![CDATA[SUCCESS]]></return_code>"
+ "<return_msg><![CDATA[OK]]></return_msg>" + "</xml> ";
}
} else {
resXml = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>"
+ "<return_msg><![CDATA[报文为空]]></return_msg>" + "</xml> ";
}
BufferedOutputStream out = new BufferedOutputStream(
response.getOutputStream());
out.write(resXml.getBytes());
out.flush();
out.close();
} //猎取随机字符串
private String getRandomStringByLength(int length) { String base = "abcdefghijklmnopqrstuvwxyz0123456789";
Random random = new Random();
StringBuffer sb = new StringBuffer(); for (int i = 0; i < length; i++) {
int number = random.nextInt(base.length());
sb.append(base.charAt(number));
} return sb.toString();
} //猎取IP
private String getIpAddr(HttpServletRequest request) { String ip = request.getHeader("X-Forwarded-For"); if (StringUtils.isNotEmpty(ip) && !"unKnown".equalsIgnoreCase(ip)) { //屡次反向代办后会有多个ip值，第一个ip才是实在ip
int index = ip.indexOf(","); if (index != -1) { return ip.substring(0, index);
} else { return ip;
}
}
ip = request.getHeader("X-Real-IP"); if (StringUtils.isNotEmpty(ip) && !"unKnown".equalsIgnoreCase(ip)) { return ip;
} return request.getRemoteAddr();
}
}
上面代码用到了PayUtil和WechatConfig这两个类，一个是设置类，一个是东西类，代码以下：
PayUtil
public class PayUtil { /**
* 署名字符串
*
* @param text 须要署名的字符串
* @param key 密钥
* @param input_charset 编码花样
* @return 署名效果
*/
public static String sign(String text, String key, String input_charset) {
text = text + "&key=" + key; return DigestUtils.md5Hex(getContentBytes(text, input_charset));
} /**
* 署名字符串
*
* @param text 须要署名的字符串
* @param sign 署名效果
* @param key 密钥
* @param input_charset 编码花样
* @return 署名效果
*/
public static boolean verify(String text, String sign, String key, String input_charset) {
text = text + key; String mysign = DigestUtils.md5Hex(getContentBytes(text, input_charset)); if (mysign.equals(sign)) { return true;
} else { return false;
}
} /**
* @param content
* @param charset
* @return
* @throws java.security.SignatureException
* @throws UnsupportedEncodingException
*/
public static byte[] getContentBytes(String content, String charset) { if (charset == null || "".equals(charset)) { return content.getBytes();
} try { return content.getBytes(charset);
} catch (UnsupportedEncodingException e) { throw new RuntimeException("MD5署名过程当中涌现毛病,指定的编码集不对,您现在指定的编码集是:" + charset);
}
}
private static boolean isValidChar(char ch) { if ((ch >= '0' && ch <= '9') || (ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z')) return true; if ((ch >= 0x4e00 && ch <= 0x7fff) || (ch >= 0x8000 && ch <= 0x952f)) return true;// 简体中文汉字编码
return false;
} /**
* 撤除数组中的空值和署名参数
*
* @param sArray 署名参数组
* @return 去掉空值与署名参数后的新署名参数组
*/
public static Map<String, String> paraFilter(Map<String, String> sArray) { Map<String, String> result = new HashMap<String, String>(); if (sArray == null || sArray.size() <= 0) { return result;
} for (String key : sArray.keySet()) { String value = sArray.get(key); if (value == null || value.equals("") || key.equalsIgnoreCase("sign")
|| key.equalsIgnoreCase("sign_type")) { continue;
}
result.put(key, value);
} return result;
} /**
* 把数组一切元素排序，并依据“参数=参数值”的形式用“&”字符拼接成字符串
*
* @param params 须要排序并介入字符拼接的参数组
* @return 拼接后字符串
*/
public static String createLinkString(Map<String, String> params) {
List<String> keys = new ArrayList<>(params.keySet());
Collections.sort(keys); String prestr = ""; for (int i = 0; i < keys.size(); i++) { String key = keys.get(i); String value = params.get(key); if (i == keys.size() - 1) {// 拼接时，不包括末了一个&字符
prestr = prestr + key + "=" + value;
} else {
prestr = prestr + key + "=" + value + "&";
}
} return prestr;
} /**
* @param requestUrl 要求地点
* @param requestMethod 要求要领
* @param outputStr 参数
*/
public static String httpRequest(String requestUrl, String requestMethod, String outputStr) { // 建立SSLContext
StringBuffer buffer = null; try {
URL url = new URL(requestUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod(requestMethod);
conn.setDoOutput(true);
conn.setDoInput(true);
conn.connect(); //往服务器端写内容
if (null != outputStr) {
OutputStream os = conn.getOutputStream();
os.write(outputStr.getBytes("utf-8"));
os.close();
} // 读取服务器端返回的内容
InputStream is = conn.getInputStream();
InputStreamReader isr = new InputStreamReader(is, "utf-8");
BufferedReader br = new BufferedReader(isr);
buffer = new StringBuffer(); String line = null; while ((line = br.readLine()) != null) {
buffer.append(line);
}
br.close();
} catch (Exception e) {
e.printStackTrace();
} return buffer.toString();
}
public static String urlEncodeUTF8(String source) { String result = source; try {
result = java.net.URLEncoder.encode(source, "UTF-8");
} catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block
e.printStackTrace();
} return result;
} /**
* 剖析xml,返回第一级元素键值对。假如第一级元素有子节点，则此节点的值是子节点的xml数据。
*
* @param strxml
* @return
* @throws org.jdom2.JDOMException
* @throws IOException
*/
public static Map doXMLParse(String strxml) throws Exception { if (null == strxml || "".equals(strxml)) { return null;
} Map m = new HashMap();
InputStream in = String2Inputstream(strxml);
SAXBuilder builder = new SAXBuilder();
Document doc = builder.build(in);
Element root = doc.getRootElement();
List list = root.getChildren();
Iterator it = list.iterator(); while (it.hasNext()) {
Element e = (Element) it.next(); String k = e.getName(); String v = "";
List children = e.getChildren(); if (children.isEmpty()) {
v = e.getTextNormalize();
} else {
v = getChildrenText(children);
}
m.put(k, v);
} //封闭流
in.close(); return m;
} /**
* 猎取子结点的xml
*
* @param children
* @return String
*/
public static String getChildrenText(List children) {
StringBuffer sb = new StringBuffer(); if (!children.isEmpty()) {
Iterator it = children.iterator(); while (it.hasNext()) {
Element e = (Element) it.next(); String name = e.getName(); String value = e.getTextNormalize();
List list = e.getChildren();
sb.append("<" + name + ">"); if (!list.isEmpty()) {
sb.append(getChildrenText(list));
}
sb.append(value);
sb.append("</" + name + ">");
}
} return sb.toString();
}
public static InputStream String2Inputstream(String str) { return new ByteArrayInputStream(str.getBytes());
}
}
WechatConfig
public class WechatConfig { //小顺序appid
public static final String appid = ""; //微信付出的商户id
public static final String mch_id = ""; //微信付出的商户密钥
public static final String key = ""; //付出胜利后的服务器回调url，这里填PayController里的回调函数地点
public static final String notify_url = ""; //署名体式格局，固定值
public static final String SIGNTYPE = "MD5"; //交易范例，小顺序付出的固定值为JSAPI
public static final String TRADETYPE = "JSAPI"; //微信一致下单接口地点
public static final String pay_url = "https://api.mch.weixin.qq.com/pay/unifiedorder";
}
在刚刚开始打仗小顺序付出的时刻，也以为比较的辣手，由于本身并没有写过付出相干的代码。厥后经由过程百度查找材料和浏览官方文档，末了把这个付出的controller完成了。末了，一定要多读几遍官方文档，然后连系PayController的代码去看，就会发明实在付出也不是很难。
以上就是小顺序后端用什么写的细致内容，更多请关注ki4网别的相干文章！
