The examples in this article share the payment code of java WeChat APP for your reference. The specific content is as follows
import java.io.IOException;import java.io.UnsupportedEncodingException;import java.util.Random;import org.apache.http.ParseException;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.Methods.HttpPost;import org.apache.http.entity.StringEntity;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.util.EntityUtils;import org.json.JSONArray;import org.json.JSONML;import org.json.JSONObject;public class Test { private static final String appid = "wx0378bf81abfe3d26";//Set private static final int mch_id = 1252196606;//Set private static final String api_key = "b8b9c2bbe92d57cc38fde49745056167";//Set private static final String notify_url = "http://www.xxx.com/weixin_notify_url.jsp";//Set private static final String trade_type = "APP";// public static void main(String[] args) { postToWeChat("5455545", "test", 0.01); postToWeChat("5455545", "Chinese", 0.01);//It will fail} /** * Submit to WeChat* * @param out_trade_no * Order number of your own system* @param body * Title* @param money * Amount * @return */ private static JSONObject postToWeChat(String out_trade_no, String body, double money) { StringBuilder xml = new StringBuilder(); String nonce_str = getRandomString(32); String ip = "127.0.0.1";// The client IP handles JSONObject itself JSONObject jso = new JSONObject(); String prepay_id = "", sign = ""; try { String weixinMoney = new java.text.DecimalFormat("#").format(money * 100);// WeChat is divided into units so it needs to be multiplied by 100 xml.append("appid=").append(appid).append("&body=").append(new String(body.getBytes("UTF-8"), "utf-8")); xml.append("&mch_id=").append(mch_id).append("&nonce_str=").append(nonce_str); xml.append("¬ify_url=").append(notify_url).append("&out_trade_no=").append(out_trade_no).append("&spbill_create_ip=").append(ip); xml.append("&total_fee=").append(weixinMoney).append("&trade_type=").append(trade_type).append("&key=").append(api_key); sign = new Util().MD5Purity(xml.toString()).toUpperCase();// MD5 encryption signature encryption class is solved by itself and it won't be put on xml.delete(0, xml.length()); xml.append("<xml>"); xml.append(" <appid>").append(appid).append("</appid>"); xml.append(" <body>").append(body).append("</body>"); xml.append(" <mch_id>").append(mch_id).append("</mch_id>"); xml.append(" <nonce_str>").append(nonce_str).append("</nonce_str>"); xml.append(" <notify_url>").append(notify_url).append("</notify_url>"); xml.append(" <out_trade_no>").append(out_trade_no).append("</out_trade_no>"); xml.append(" <spbill_create_ip>").append(ip).append("</spbill_create_ip>"); xml.append(" <total_fee>").append(weixinMoney).append("</total_fee>"); xml.append(" <trade_type>").append(trade_type).append("</trade_type>"); xml.append(" <sign>").append(sign).append("</sign>"); xml.append("</xml>"); HttpPost post = new HttpPost("https://api.mch.weixin.qq.com/pay/unifiedorder"); StringEntity entity = new StringEntity(xml.toString(), "UTF-8"); entity.setContentEncoding("utf-8"); entity.setContentType("text/xml"); post.setEntity(entity); JSONArray childNodes = JSONML.toJSONObject(EntityUtils.toString(new DefaultHttpClient().execute(post).getEntity(), "utf-8")).getJSONArray( "childNodes"); System.out.println(childNodes); int len = childNodes.length() - 1; for (int i = len; i > -1; i--) { JSONObject js = childNodes.getJSONObject(i); if (js.get("tagName").equals("prepay_id")) { prepay_id = js.getJSONArray("childNodes").getString(0); break; } } } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (ParseException e) { e.printStackTrace(); } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } jso.put("sign", sign); jso.put("appid", appid); jso.put("noncestr", nonce_str); jso.put("package", "Sign=WXPay"); jso.put("partnerid", mch_id); jso.put("prepayid", prepare_id); jso.put("timestamp", System.currentTimeMillis()); return jso; } /** * Indicates the length of the generated string* * @param length * @return */ private static String getRandomString(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(); }}The above is all about this article, I hope it will be helpful for everyone to learn Java programming.