②准备好11个参数JSAPI支付方式
1 配置微信平台
①配置微信公众平台
登录微信公众平台=》公众号设置=》功能设置=》网页授权域名
②配置微信商家平台
①先去官方下载SDK，并导进项目中
2 后台代码的实现
JSAPI官方文档：https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_1
①先去官方下载SDK，并导进项目中
地址：https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=11_1
②准备好11个参数appid：商家平台ID。在微信的平台上有
body：商品描述。
mch_id：商户ID。在微信的平台上有
nonce_str：随机字符串，UUID就好了。
openid：用户标识。因为这边是用户已经登录成功了。所以在session中就能拿到。
out_trade_no：商户订单号
spbill_create_ip：终端IP。这个可以从请求头中拿到
total_fee：支付金额。单位是分。
trade_type：交易类型。这里我填JSAPI
notify_url：通知地址。就是用户支付成功之后，微信访问你的哪个接口，跟你传递支付成功的相关信息。
sign：签名。这个签名它是由上面的10个参数计算得出的。
③源码
sendPay类：
import java.io.IOException;import java.io.InputStream;import java.math.BigDecimal;import java.net.URLEncoder;import java.util.HashMap;import java.util.Map;import java.util.UUID;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.http.auth.AUTH;import org.hamcrest.core.Is;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.ResponseBody;import com.jc.util.wxPay.WXPayUtil;import com.sun.xml.internal.fastinfoset.Encoder;import controller.AuthUtil;import net.sf.json.JSONObject;
@Controller
@RequestMapping("/pay")public class sendPay { /** * @Description 微信浏览器内微信支付/公众号支付(JSAPI)
* @param request
* @param code
* @return Map */@RequestMapping(value = "orders")public @ResponseBody Map orders(HttpServletRequest request, HttpServletResponse response) {try {
String openId = "用户的openid";// 拼接统一下单地址参数Map paraMap = new HashMap();// 获取请求ip地址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.getRemoteAddr();
}if (ip.indexOf(",") != -1) {
String[] ips = ip.split(",");
ip = ips[0].trim();
}
paraMap.put("appid", AuthUtil.APPID); // 商家平台IDparaMap.put("body", "纯情小店铺-薯条"); // 商家名称-销售商品类目、String(128)paraMap.put("mch_id", AuthUtil.MCHID); // 商户IDparaMap.put("nonce_str", WXPayUtil.generateNonceStr()); // UUIDparaMap.put("openid", openId);
paraMap.put("out_trade_no", UUID.randomUUID().toString().replaceAll("-", ""));// 订单号,每次都不同paraMap.put("spbill_create_ip", ip);
paraMap.put("total_fee", "1"); // 支付金额，单位分paraMap.put("trade_type", "JSAPI"); // 支付类型paraMap.put("notify_url", "用户支付完成后，你想微信调你的哪个接口");// 此路径是微信服务器调用支付结果通知路径随意写String sign = WXPayUtil.generateSignature(paraMap, AuthUtil.PATERNERKEY);
paraMap.put("sign", sign);
String xml = WXPayUtil.mapToXml(paraMap);// 将所有参数(map)转xml格式// 统一下单 https://api.mch.weixin.qq.com/pay/unifiedorderString unifiedorder_url = "https://api.mch.weixin.qq.com/pay/unifiedorder";
System.out.println("xml为：" + xml);// String xmlStr = HttpRequest.sendPost(unifiedorder_url,// xml);//发送post请求"统一下单接口"返回预支付id:prepay_idString xmlStr = HttpRequest.httpsRequest(unifiedorder_url, "POST", xml);
System.out.println("xmlStr为：" + xmlStr);// 以下内容是返回前端页面的json数据String prepay_id = "";// 预支付idif (xmlStr.indexOf("SUCCESS") != -1) {
Map map = WXPayUtil.xmlToMap(xmlStr);
prepay_id = (String) map.get("prepay_id");
}
Map payMap = new HashMap();
payMap.put("appId", AuthUtil.APPID);
payMap.put("timeStamp", WXPayUtil.getCurrentTimestamp() + "");
payMap.put("nonceStr", WXPayUtil.generateNonceStr());
payMap.put("signType", "MD5");
payMap.put("package", "prepay_id=" + prepay_id);
String paySign = WXPayUtil.generateSignature(payMap, AuthUtil.PATERNERKEY);
payMap.put("paySign", paySign);//将这个6个参数传给前端return payMap;
} catch (Exception e) {
e.printStackTrace();
}return null;
}/** * @Title: callBack
* @Description: 支付完成的回调函数
* @param:
* @return: */@RequestMapping("/notify")public String callBack(HttpServletRequest request, HttpServletResponse response) {// System.out.println("微信支付成功,微信发送的callback信息,请注意修改订单信息");InputStream is = null;try {
is = request.getInputStream();// 获取请求的流信息(这里是微信发的xml格式所有只能使用流来读)String xml = WXPayUtil.InputStream2String(is);
Map notifyMap = WXPayUtil.xmlToMap(xml);// 将微信发的xml转map
System.out.println("微信返回给回调函数的信息为："+xml); if (notifyMap.get("result_code").equals("SUCCESS")) {
String ordersSn = notifyMap.get("out_trade_no");// 商户订单号String amountpaid = notifyMap.get("total_fee");// 实际支付的订单金额:单位 分BigDecimal amountPay = (new BigDecimal(amountpaid).divide(new BigDecimal("100"))).setScale(2);// 将分转换成元-实际支付金额:元/* * 以下是自己的业务处理------仅做参考 更新order对应字段/已支付金额/状态码 */System.out.println("===notify===回调方法已经被调！！！");
} // 告诉微信服务器收到信息了，不要在调用回调action了========这里很重要回复微信服务器信息用流发送一个xml即可response.getWriter().write("");
} catch (Exception e) {
e.printStackTrace();
} finally {if (is != null) {try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
} return null;
}
}
HttpRequest类：
import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStream;import java.io.PrintWriter;import java.net.URL;import java.net.URLConnection;import java.util.List;import java.util.Map;import javax.net.ssl.HttpsURLConnection;public class HttpRequest {/** * 向指定URL发送GET方法的请求
*
* @param url
* 发送请求的URL
* @param param
* 请求参数,请求参数应该是 name1=value1&name2=value2 的形式。
* @return URL 所代表远程资源的响应结果 */public static String sendGet(String url, String param) {
String result = "";
BufferedReader in = null;try {
String urlNameString = url + "?" + param;
System.out.println(urlNameString);
URL realUrl = new URL(urlNameString);// 打开和URL之间的连接URLConnection connection = realUrl.openConnection();// 设置通用的请求属性connection.setRequestProperty("accept", "*/*");
connection.setRequestProperty("connection", "Keep-Alive");
connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");// 建立实际的连接 connection.connect();// 获取所有响应头字段Map> map = connection.getHeaderFields();// 遍历所有的响应头字段for (String key : map.keySet()) {
System.out.println(key + "--->" + map.get(key));
}// 定义 BufferedReader输入流来读取URL的响应in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String line;while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
System.out.println("发送GET请求出现异常！" + e);
e.printStackTrace();
}// 使用finally块来关闭输入流finally {try {if (in != null) {
in.close();
}
} catch (Exception e2) {
e2.printStackTrace();
}
}return result;
}/** * 向指定 URL 发送POST方法的请求
*
* @param url
* 发送请求的 URL
* @param param
* 请求参数,请求参数应该是 name1=value1&name2=value2 的形式。
* @return 所代表远程资源的响应结果 */public static String sendPost(String url, String param) {
PrintWriter out = null;
BufferedReader in = null;
String result = "";try {
URL realUrl = new URL(url);// 打开和URL之间的连接URLConnection conn = realUrl.openConnection();// 设置通用的请求属性conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");// 发送POST请求必须设置如下两行conn.setDoOutput(true);
conn.setDoInput(true);// 获取URLConnection对象对应的输出流out = new PrintWriter(conn.getOutputStream());// 发送请求参数 out.print(param);// flush输出流的缓冲 out.flush();// 定义BufferedReader输入流来读取URL的响应in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
String line;while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
System.out.println("发送 POST 请求出现异常！" + e);
e.printStackTrace();
}// 使用finally块来关闭输出流、输入流finally {try {if (out != null) {
out.close();
}if (in != null) {
in.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}return result;
}/** * post请求并得到返回结果
*
* @param requestUrl
* @param requestMethod
* @param output
* @return */public static String httpsRequest(String requestUrl, String requestMethod, String output) {try {
URL url = new URL(requestUrl);
HttpsURLConnection connection = (HttpsURLConnection) url.openConnection();
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setUseCaches(false);
connection.setRequestMethod(requestMethod);if (null != output) {
OutputStream outputStream = connection.getOutputStream();
outputStream.write(output.getBytes("UTF-8"));
outputStream.close();
}// 从输入流读取返回内容InputStream inputStream = connection.getInputStream();
InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String str = null;
StringBuffer buffer = new StringBuffer();while ((str = bufferedReader.readLine()) != null) {
buffer.append(str);
}
bufferedReader.close();
inputStreamReader.close();
inputStream.close();
inputStream = null;
connection.disconnect();return buffer.toString();
} catch (Exception ex) {
ex.printStackTrace();
}return "";
}
}
AuthUtil类import java.io.IOException;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.util.EntityUtils;import net.sf.json.JSONObject;public class AuthUtil {public static final String APPID = "平台ID";public static final String APPSECRET = "平台密钥";public static final String MCHID = "商家ID";public static final String PATERNERKEY = "商家密钥";
public static JSONObject doGetJson(String url) throws ClientProtocolException, IOException {
JSONObject jsonObject = null;// 首先初始化HttpClient对象DefaultHttpClient client = new DefaultHttpClient();// 通过get方式进行提交HttpGet httpGet = new HttpGet(url);// 通过HTTPclient的execute方法进行发送请求HttpResponse response = client.execute(httpGet);// 从response里面拿自己想要的结果HttpEntity entity = response.getEntity();if (entity != null) {
String result = EntityUtils.toString(entity, "UTF-8");
jsonObject = jsonObject.fromObject(result);
}// 把链接释放掉 httpGet.releaseConnection();return jsonObject;
}
}
2.3 前端的实现
这是只用一个jsp页面来做测试
html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
微信支付JSP$(function(){var appId,timeStamp,nonceStr,package,signType,paySign;
$("#payId").click(function(){
pay();
}); //去后台拿六个参数function pay(){ var url = "http://localhost:8082/WeChat/pay/orders";
$.get(url,function(result) {
appId = result.appId;
timeStamp = result.timeStamp;
nonceStr = result.nonceStr;
package = result.package;
signType = result.signType;
paySign = result.paySign; if (typeof WeixinJSBridge == "undefined") {if (document.addEventListener) {
document.addEventListener('WeixinJSBridgeReady',onBridgeReady, false);
} else if (document.attachEvent) {
document.attachEvent('WeixinJSBridgeReady',onBridgeReady);
document.attachEvent('onWeixinJSBridgeReady',onBridgeReady);
}
alert("请在微信上进行支付操作！");
onBridgeReady();
} else {
onBridgeReady();
}
});
}//去微信那边发起支付请求function onBridgeReady(){
alert("appId:"+appId+" "+"timeStamp:"+timeStamp+" "+"nonceStr:"+nonceStr+" "+"package:"+package+" "+"signType:"+signType+" "+"paySign:"+paySign+" ");
WeixinJSBridge.invoke( 'getBrandWCPayRequest', { "appId":appId, //公众号名称,由商户传入 "timeStamp":timeStamp, //时间戳,自1970年以来的秒数 "nonceStr":nonceStr, //随机串 "package":package,
"signType":signType, //微信签名方式： "paySign":paySign //微信签名 },
function(res){
if(res.err_msg == "get_brand_wcpay_request:ok" ) { //alert('支付成功'); console.log("支付成功"); //支付成功后跳转的页面 }else if(res.err_msg == "get_brand_wcpay_request:cancel"){
alert('支付取消');
}else if(res.err_msg == "get_brand_wcpay_request:fail"){
alert('支付失败');
alert(JSON.stringify(res));
WeixinJSBridge.call('closeWindow');
} //使用以上方式判断前端返回,微信团队郑重提示：res.err_msg将在用户支付成功后返回ok,但并不保证它绝对可靠。 });
}
})
三，总结
虽然第一次看官方文档很乱，信息量很多，但仔细总结一下，其实就下面这点流程而已。
再记录点，以防有用：
url urlencodepublic static String inputStream2String(InputStream inStream, String encoding){
String result = null;
ByteArrayOutputStream outStream = null;try { if(inStream != null){
outStream = new ByteArrayOutputStream(); byte[] tempBytes = new byte[1024]; int count = 0; while((count = inStream.read(tempBytes)) != -1){
outStream.write(tempBytes, 0, count);
}
tempBytes = null;
outStream.flush();
result = new String(outStream.toByteArray(), encoding);
outStream.close();
}
} catch (Exception e) {
result = null;
} return result;
}
转载：
https://blog.csdn.net/daotiao0199/article/details/85284038
https://blog.csdn.net/javaYouCome/article/details/79473743
