最近在做一个项目中的一个小功能是关于微信支付的，在这里总结一下代码
微信支付：
//C端微信支付
public String CDWeiXinPay(HttpServletRequest request,
HttpServletResponse response) {
Map<String, String> map = getRequestParams(request);
CallResult result = new CallResult();
try {
String paramContent = "";
String sign = "";
String nonceStr = CheckUtil.generateNonceStr();
Map<String, String> param = new HashMap<>();
param.put("appid", WeiXinConst.APPID); //公众号id
param.put("mch_id", WeiXinConst.MCHID);//商户平台id
param.put("device_info", "WEB");
param.put("nonce_str", nonceStr);
param.put("body", "蚁传播公众号支付");//订单标题
param.put("out_trade_no", map.get("orderId"));//订单ID
param.put("total_fee", map.get("payAmount")); //订单需要支付的金额
param.put("trade_type", "JSAPI");//交易类型 JSAPI 公众号支付 NATIVE 扫码支付 APP APP支付
param.put("notify_url",WeiXinConst.cd_notify_url);//notify_url 支付成功之后 微信会进行异步回调的地址
param.put("openid", map.get("openId"));//微信授权获取openId
param.put("sign_type", "MD5");
sign = WXPayUtil.generateSignature(param,WeiXinConst.KEY);
param.put("sign", sign);
paramContent = WXPayUtil.mapToXml(param);
String s = OkHttpUtil.getInstance().doPost(WeiXinConst.sm_weiXinPay_url, paramContent);//微信支付路径
Map<String, String> returnResult = WXPayUtil.xmlToMap(s);
String prepay_id;
HashMap<String, String> pageParam = new HashMap<>();
if (returnResult.get("return_code").equals("SUCCESS") && returnResult.get("result_code").equals("SUCCESS")) {
prepay_id = returnResult.get("prepay_id");
String timestamp = CheckUtil.create_timestamp();
pageParam.put("appId", WeiXinConst.APPID);
pageParam.put("nonceStr", nonceStr);
pageParam.put("package", "prepay_id=" + prepay_id);
pageParam.put("timeStamp", timestamp);
pageParam.put("signType", "MD5");
String pageSign =WXPayUtil.generateSignature(pageParam,WeiXinConst.KEY);
pageParam.put("paySign", pageSign);
pageParam.put("prepay_id", prepay_id);
result.addSuccess("请求成功");
} else {
result.addError("请求失败");
}
result.setData(pageParam);
System.out.println("--------------------"+JsonUtil.transformObject(result)+"--------------------------------------");
logger.info(result);
} catch (Exception e) {
logger.error(e.toString(), e);
result.addError("服务器异常：" + e.getMessage());
}
return JsonUtil.transformObject(result);
}
public static String generateNonceStr() {
return UUID.randomUUID().toString().replaceAll("-", "").substring(0, 32);
}
public class OkHttpUtil {
private static OkHttpUtil okHttpUtil;
private static OkHttpClient okHttpClient;
private OkHttpUtil() {
/**
* OkHttp是一个第三方类库，
* 用于android中请求网络
* 创建OkHttpClient对象
*/
okHttpClient = new OkHttpClient();
}
public static OkHttpUtil getInstance() {
if (okHttpUtil == null) {
okHttpUtil = new OkHttpUtil();
}
return okHttpUtil;
}
public String doGet(String url) {
/**
* 请求接口
* 创建Request对象
*/
Request request = new Request.Builder()
.url(url)
.build();
//得到request对象
Call call = okHttpClient.newCall(request);
try {
Response response = call.execute();
return response.body().string();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
public String doPost(String url, Map<String, String> param) {
FormBody.Builder builder = new FormBody.Builder();
for (Map.Entry<String, String> entry : param.entrySet()) {
builder.add(entry.getKey(), entry.getValue());
}
RequestBody body = builder.build();
Request request = new Request.Builder()
.url(url)
.post(body)
.build();
Call call = okHttpClient.newCall(request);
try {
Response response = call.execute();
return response.body().string();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
public String doPostParam(String url, Map<String, Object> param) {
FormBody.Builder builder = new FormBody.Builder();
for (Map.Entry<String, Object> entry : param.entrySet()) {
builder.add(entry.getKey(), (String) entry.getValue());
}
RequestBody body = builder.build();
Request request = new Request.Builder()
.url(url)
.post(body)
.build();
Call call = okHttpClient.newCall(request);
try {
Response response = call.execute();
return response.body().string();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
public String doPost(String url, String param) {
MediaType JSON = MediaType.parse("application/json; charset=utf-8");
RequestBody body = RequestBody.create(JSON, param);
Request request = new Request.Builder()
.url(url)
.post(body)
.build();
Call call = okHttpClient.newCall(request);
try {
Response response = call.execute();
return response.body().string();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
public class CheckUtil {
/**
* 生成签名. 注意，若含有sign_type字段，必须和signType参数保持一致。
* @param data 待签名数据
* @param key API密钥
* @param signType 签名方式
* @return 签名
*/
public static String generateSignature(final Map<String, String> data, String key, WXPayConstants.SignType signType) throws Exception {
Set<String> keySet = data.keySet();
String[] keyArray = keySet.toArray(new String[keySet.size()]);
Arrays.sort(keyArray);
StringBuilder sb = new StringBuilder();
for (String k : keyArray) {
if (k.equals(WXPayConstants.FIELD_SIGN)) {
continue;
}
if (data.get(k).trim().length() > 0) // 参数值为空，则不参与签名
sb.append(k).append("=").append(data.get(k).trim()).append("&");
}
sb.append("key=").append(key);
if (WXPayConstants.SignType.MD5.equals(signType)) {
return MD5(sb.toString()).toUpperCase();
}
else if (WXPayConstants.SignType.HMACSHA256.equals(signType)) {
return HMACSHA256(sb.toString(), key);
}
else {
throw new Exception(String.format("Invalid sign_type: %s", signType));
}
}
/**
* 通过HttpServletRequest返回IP地址
* @param request HttpServletRequest
* @return ip String
* @throws Exception
*/
public static String getIpAddr(HttpServletRequest request) throws Exception {
String ip = request.getHeader("x-forwarded-for");
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("Proxy-Client-IP");
}
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("WL-Proxy-Client-IP");
}
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("HTTP_CLIENT_IP");
}
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("HTTP_X_FORWARDED_FOR");
}
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getRemoteAddr();
}
return ip;
}
public static String generateNonceStr() {
return UUID.randomUUID().toString().replaceAll("-", "").substring(0, 32);
}
public static String getXMLFromMap(Map<String, String> map) throws Exception {
StringBuffer sb = new StringBuffer();
sb.append("<xml>");
Set<String> set = map.keySet();
Iterator<String> it = set.iterator();
while (it.hasNext()) {
String key = it.next();
sb.append("<" + key + ">").append(map.get(key)).append("</" + key + ">");
}
sb.append("</xml>");
return sb.toString();
}
/**
* XML格式字符串转换为Map
*
* @param strXML XML字符串
* @return XML数据转换后的Map
* @throws Exception
*/
public static Map<String, String> xmlToMap(String strXML) throws Exception {
try {
Map<String, String> data = new HashMap<String, String>();
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
InputStream stream = new ByteArrayInputStream(strXML.getBytes("UTF-8"));
org.w3c.dom.Document doc = documentBuilder.parse(stream);
doc.getDocumentElement().normalize();
NodeList nodeList = doc.getDocumentElement().getChildNodes();
for (int idx = 0; idx < nodeList.getLength(); ++idx) {
Node node = nodeList.item(idx);
if (node.getNodeType() == Node.ELEMENT_NODE) {
org.w3c.dom.Element element = (org.w3c.dom.Element) node;
data.put(element.getNodeName(), element.getTextContent());
}
}
try {
stream.close();
} catch (Exception ex) {
// do nothing
}
return data;
} catch (Exception ex) {
throw ex;
}
}
public static String create_timestamp() {
return Long.toString(System.currentTimeMillis() / 1000);
}
}
上面代码里WeiXinConst实体类中主要是配置了微信支付的一系列的参数。微信支付中所需要的参数都可以写到这个实体类中，在支付成功之后微信会自动回调我们在上面配置的微信回调地址，进行支付成功之后的操作。
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