Java实现微信扫码支付---方式二
话不多说直接上代码：
我这里将有关微信支付的代码都放到了util包下面。以下代码亲测可用。附上原文链接：https://blog.csdn.net/chen_pan_pan/article/details/71433679
HttpUtil：
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.URL;
import java.net.URLConnection;
import org.apache.log4j.Logger;
/**
* http请求工具类
* @author chenp
*
*/
public class HttpUtil {
private final static int CONNECT_TIMEOUT = 5000; // in milliseconds 连接超时的时间
private final static String DEFAULT_ENCODING = "UTF-8"; //字符串编码
private static Logger lg=Logger.getLogger(HttpUtil.class);
public static String postData(String urlStr, String data){
return postData(urlStr, data, null);
}
/**
* post数据请求
* @param urlStr
* @param data
* @param contentType
* @return
*/
public static String postData(String urlStr, String data, String contentType){
BufferedReader reader = null;
try {
URL url = new URL(urlStr);
URLConnection conn = url.openConnection();
conn.setDoOutput(true);
conn.setConnectTimeout(CONNECT_TIMEOUT);
conn.setReadTimeout(CONNECT_TIMEOUT);
if(contentType != null)
conn.setRequestProperty("content-type", contentType);
OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream(), DEFAULT_ENCODING);
if(data == null)
data = "";
writer.write(data);
writer.flush();
writer.close();
reader = new BufferedReader(new InputStreamReader(conn.getInputStream(), DEFAULT_ENCODING));
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line);
sb.append("\r\n");
}
return sb.toString();
} catch (IOException e) {
lg.info("Error connecting to " + urlStr + ": " + e.getMessage());
} finally {
try {
if (reader != null)
reader.close();
} catch (IOException e) {
}
}
return null;
}
} MD5Util：
import java.security.MessageDigest;
/**
* Md5加密类
* @author chenp
*
*/
public class MD5Util {
private static String byteArrayToHexString(byte b[]) {
StringBuffer resultSb = new StringBuffer();
for (int i = 0; i < b.length; i++)
resultSb.append(byteToHexString(b[i]));
return resultSb.toString();
}
private static String byteToHexString(byte b) {
int n = b;
if (n < 0)
n += 256;
int d1 = n / 16;
int d2 = n % 16;
return hexDigits[d1] + hexDigits[d2];
}
public static String MD5Encode(String origin, String charsetname) {
String resultString = null;
try {
resultString = new String(origin);
MessageDigest md = MessageDigest.getInstance("MD5");
if (charsetname == null || "".equals(charsetname))
resultString = byteArrayToHexString(md.digest(resultString
.getBytes()));
else
resultString = byteArrayToHexString(md.digest(resultString
.getBytes(charsetname)));
} catch (Exception exception) {
}
return resultString;
}
private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5",
"6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
}
PayForUtil ：
import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.InterfaceAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.SortedMap;
import org.apache.log4j.Logger;
public class PayForUtil {
private static Logger lg=Logger.getLogger(PayForUtil.class);
/**
* 是否签名正确,规则是:按参数名称a-z排序,遇到空值的参数不参加签名。
* @return boolean
*/
public static boolean isTenpaySign(String characterEncoding, SortedMap packageParams, String API_KEY) {
StringBuffer sb = new StringBuffer();
Set es = packageParams.entrySet();
Iterator it = es.iterator();
while(it.hasNext()) {
Map.Entry entry = (Map.Entry)it.next();
String k = (String)entry.getKey();
String v = (String)entry.getValue();
if(!"sign".equals(k) && null != v && !"".equals(v)) {
sb.append(k + "=" + v + "&");
}
}
sb.append("key=" + API_KEY);
//算出摘要
String mysign = MD5Util.MD5Encode(sb.toString(), characterEncoding).toLowerCase();
String tenpaySign = ((String)packageParams.get("sign")).toLowerCase();
return tenpaySign.equals(mysign);
}
/**
* @author chenp
* @Description：sign签名
* @param characterEncoding
* 编码格式
* @param parameters
* 请求参数
* @return
*/
public static String createSign(String characterEncoding, SortedMap packageParams, String API_KEY) {
StringBuffer sb = new StringBuffer();
Set es = packageParams.entrySet();
Iterator it = es.iterator();
while (it.hasNext()) {
Map.Entry entry = (Map.Entry) it.next();
String k = (String) entry.getKey();
String v = (String) entry.getValue();
if (null != v && !"".equals(v) && !"sign".equals(k) && !"key".equals(k)) {
sb.append(k + "=" + v + "&");
}
}
sb.append("key=" + API_KEY);
String sign = MD5Util.MD5Encode(sb.toString(), characterEncoding).toUpperCase();
return sign;
}
/**
* @author chenp
* @Description：将请求参数转换为xml格式的string
* @param parameters
* 请求参数
* @return
*/
public static String getRequestXml(SortedMap parameters) {
StringBuffer sb = new StringBuffer();
sb.append("" );
Set es = parameters.entrySet();
Iterator it = es.iterator();
while (it.hasNext()) {
Map.Entry entry = (Map.Entry) it.next();
String k = (String) entry.getKey();
String v = (String) entry.getValue();
if ("attach".equalsIgnoreCase(k) || "body".equalsIgnoreCase(k) || "sign".equalsIgnoreCase(k)) {
sb.append("<" + k + ">" + " + v + "]]> + k + ">");
} else {
sb.append("<" + k + ">" + v + " + k + ">");
}
}
sb.append("");
return sb.toString();
}
/**
* 取出一个指定长度大小的随机正整数.
*
* @param length
* int 设定所取出随机数的长度。length小于11
* @return int 返回生成的随机数。
*/
public static int buildRandom(int length) {
int num = 1;
double random = Math.random();
if (random < 0.1) {
random = random + 0.1;
}
for (int i = 0; i < length; i++) {
num = num * 10;
}
return (int) ((random * num));
}
/**
* 获取当前时间 yyyyMMddHHmmss
* @author chenp
* @return String
*/
public static String getCurrTime() {
Date now = new Date();
SimpleDateFormat outFormat = new SimpleDateFormat("yyyyMMddHHmmss");
String s = outFormat.format(now);
return s;
}
/**
* 获取本机IP地址
* @author chenp
* @return
*/
public static String localIp(){
String ip = null;
Enumeration allNetInterfaces;
try {
allNetInterfaces = NetworkInterface.getNetworkInterfaces();
while (allNetInterfaces.hasMoreElements()) {
NetworkInterface netInterface = (NetworkInterface) allNetInterfaces.nextElement();
List InterfaceAddress = netInterface.getInterfaceAddresses();
for (InterfaceAddress add : InterfaceAddress) {
InetAddress Ip = add.getAddress();
if (Ip != null && Ip instanceof Inet4Address) {
ip = Ip.getHostAddress();
}
}
}
} catch (SocketException e) {
lg.warn("获取本机Ip失败:异常信息:"+e.getMessage());
}
return ip;
}
} WeChatConfig ：
说明：此类与原文相比稍作了修改，大家也可以根据自己需要修改相关代码。
import com.iptop.service.base.ConfigProperties;
/**
* 微信支付配置文件
* @author chenp
*
*/
public class WeChatConfig {
/**
* 微信服务号APPID
*/
public static String APPID="";
/**
* 微信支付的商户号
*/
public static String MCHID="";
/**
* 微信支付的API密钥
*/
public static String APIKEY="";
/**
* 微信支付成功之后的回调地址【注意：当前回调地址必须是公网能够访问的地址】
*/
public static String WECHAT_NOTIFY_URL_PC="";
/**
* 微信统一下单API地址
*/
public static String UFDODER_URL="https://api.mch.weixin.qq.com/pay/unifiedorder";
/**
* true为使用真实金额支付，false为使用测试金额支付（1分）
*/
public static String WXPAY="";
} WeChatParams ：
/**
* 微信支付需要的一些参数
* @author chenp
*
*/
@Data//此注解代替了set、get方法，如果不想用这个注解也可以自己写set、get方法。
public class WeChatParams {
public String total_fee;//订单金额【备注：以分为单位】
public String body;//商品名称
public String out_trade_no;//商户订单号
public String attach;//附加参数
public String memberid;//会员ID
} XMLUtil ：
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
public class XMLUtil {
/**
* 解析xml,返回第一级元素键值对。如果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 JDOMException
* @throws IOException
*/
public static Map doXMLParse(String strxml) throws JDOMException, IOException {
strxml = strxml.replaceFirst("encoding=\".*\"", "encoding=\"UTF-8\"");
if(null == strxml || "".equals(strxml)) {
return null;
}
Map m = new HashMap();
InputStream in = new ByteArrayInputStream(strxml.getBytes("UTF-8"));
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 = XMLUtil.getChildrenText(children);
}
m.put(k, v);
}
//关闭流
in.close();
return m;
}
/**
* 获取子结点的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(XMLUtil.getChildrenText(list));
}
sb.append(value);
sb.append(" + name + ">");
}
}
return sb.toString();
}
}
WeixinPay ：
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
public class WeixinPay {
public static Logger lg=Logger.getLogger(WeixinPay.class);
private static final int BLACK = 0xff000000;
private static final int WHITE = 0xFFFFFFFF;
/**
* 获取微信支付的二维码地址
* @return
* @author chenp
* @throws Exception
*/
public static String getCodeUrl(WeChatParams ps) throws Exception {
/**
* 账号信息
*/
String appid = WeChatConfig.APPID;//微信服务号的appid
String mch_id = WeChatConfig.MCHID; //微信支付商户号
String key = WeChatConfig.APIKEY; // 微信支付的API密钥
String notify_url = WeChatConfig.WECHAT_NOTIFY_URL_PC;//回调地址【注意，这里必须要使用外网的地址】
String ufdoder_url=WeChatConfig.UFDODER_URL;//微信下单API地址
String trade_type = "NATIVE"; //类型【网页扫码支付】
/**
* 时间字符串
*/
String currTime = PayForUtil.getCurrTime();
String strTime = currTime.substring(8, currTime.length());
String strRandom = PayForUtil.buildRandom(4) + "";
String nonce_str = strTime + strRandom;
/**
* 参数封装
*/
SortedMap packageParams = new TreeMap();
packageParams.put("appid", appid);
packageParams.put("mch_id", mch_id);
packageParams.put("nonce_str", nonce_str);//随机字符串
packageParams.put("body", ps.body);//支付的商品名称
packageParams.put("out_trade_no", ps.out_trade_no+nonce_str);//商户订单号【备注：每次发起请求都需要随机的字符串，否则失败。】
packageParams.put("total_fee", ps.total_fee);//支付金额
packageParams.put("spbill_create_ip", PayForUtil.localIp());//客户端主机
packageParams.put("notify_url", notify_url);
packageParams.put("trade_type", trade_type);
packageParams.put("attach", ps.attach);//额外的参数【业务类型+会员ID+支付类型】
String sign = PayForUtil.createSign("UTF-8", packageParams,key); //获取签名
packageParams.put("sign", sign);
String requestXML = PayForUtil.getRequestXml(packageParams);//将请求参数转换成String类型
lg.info("微信支付请求参数的报文"+requestXML);
String resXml = HttpUtil.postData(ufdoder_url,requestXML); //解析请求之后的xml参数并且转换成String类型
Map map = XMLUtil.doXMLParse(resXml);
lg.info("微信支付响应参数的报文"+resXml);
String urlCode = (String) map.get("code_url");
return urlCode;
}
/**
* 将路径生成二维码图片
* @author chenp
* @param content
* @param response
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
public static void encodeQrcode(String content,HttpServletResponse response){
if(StringUtils.isBlank(content))
return;
MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
Map hints = new HashMap();
BitMatrix bitMatrix = null;
try {
bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, 250, 250,hints);
BufferedImage image = toBufferedImage(bitMatrix);
//输出二维码图片流
try {
ImageIO.write(image, "png", response.getOutputStream());
} catch (IOException e) {
e.printStackTrace();
}
} catch (WriterException e1) {
e1.printStackTrace();
}
}
/**
* 类型转换
* @author chenp
* @param matrix
* @return
*/
public static BufferedImage toBufferedImage(BitMatrix matrix) {
int width = matrix.getWidth();
int height = matrix.getHeight();
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
for (int x = 0; x < width; x++) {
for (int y = 0; y < height; y++) {
image.setRGB(x, y, matrix.get(x, y) == true ? BLACK : WHITE);
}
}
return image;
}
// 特殊字符处理
public static String UrlEncode(String src) throws UnsupportedEncodingException {
return URLEncoder.encode(src, "UTF-8").replace("+", "%20");
}
} 最后还有一段支付后的回调代码。
/**
* pc端微信支付之后的回调方法
* @param request
* @param response
* @throws Exception
*/
@RequestMapping(value="wechat_notify_url_pc",method=RequestMethod.POST)
public void wechat_notify_url_pc(HttpServletRequest request,HttpServletResponse response) throws Exception{
//读取参数
InputStream inputStream ;
StringBuffer sb = new StringBuffer();
inputStream = request.getInputStream();
String s ;
BufferedReader in = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
while ((s = in.readLine()) != null){
sb.append(s);
}
in.close();
inputStream.close();
//解析xml成map
Map<String, String> m = new HashMap<String, String>();
m = XMLUtil.doXMLParse(sb.toString());
//过滤空 设置 TreeMap
SortedMap<Object,Object> packageParams = new TreeMap<Object,Object>();
Iterator<String> it = m.keySet().iterator();
while (it.hasNext()) {
String parameter = it.next();
String parameterValue = m.get(parameter);
String v = "";
if(null != parameterValue) {
v = parameterValue.trim();
}
packageParams.put(parameter, v);
}
// 微信支付的API密钥
String key = WeChatConfig.APIKEY; // key
lg.info("微信支付返回回来的参数："+packageParams);
//判断签名是否正确
if(PayForUtil.isTenpaySign("UTF-8", packageParams,key)) {
//------------------------------
//处理业务开始
//------------------------------
String resXml = "";
if("SUCCESS".equals((String)packageParams.get("result_code"))){
// 这里是支付成功
//执行自己的业务逻辑开始
String app_id = (String)packageParams.get("appid");
String mch_id = (String)packageParams.get("mch_id");
String openid = (String)packageParams.get("openid");
String is_subscribe = (String)packageParams.get("is_subscribe");//是否关注公众号
//附加参数【商标申请_0bda32824db44d6f9611f1047829fa3b_15460】--【业务类型_会员ID_订单号】
String attach = (String)packageParams.get("attach");
//商户订单号
String out_trade_no = (String)packageParams.get("out_trade_no");
//付款金额【以分为单位】
String total_fee = (String)packageParams.get("total_fee");
//微信生成的交易订单号
String transaction_id = (String)packageParams.get("transaction_id");//微信支付订单号
//支付完成时间
String time_end=(String)packageParams.get("time_end");
lg.info("app_id:"+app_id);
lg.info("mch_id:"+mch_id);
lg.info("openid:"+openid);
lg.info("is_subscribe:"+is_subscribe);
lg.info("out_trade_no:"+out_trade_no);
lg.info("total_fee:"+total_fee);
lg.info("额外参数_attach:"+attach);
lg.info("time_end:"+time_end);
//执行自己的业务逻辑结束
lg.info("支付成功");
//通知微信.异步确认成功.必写.不然会一直通知后台.八次之后就认为交易失败了.
resXml = "" + "" + "因为采用的是微信扫码支付的第二种方式，这种方式较第一种业务逻辑相对简单，也不需要在商户平台进行设置什么的（我这里就没有进行什么设置，沿用的还是以前的设置，但是我看了文档很明显此种扫码支付方式没有用到以前的配置，文档中也没有提到要进行什么设置。仅供参考！！！！！！！！）
完成上述代码之后，写一个测试接口：
//微信支付接口
@RequestMapping("/wxPay")
public String wxPay(WeChatParams ps) throws Exception {
ps.setBody("测试商品3");
ps.setTotal_fee("1");
ps.setOut_trade_no("hw5409550792199899");
ps.setAttach("xiner");
ps.setMemberid("888");
String urlCode = WeixinPay.getCodeUrl(ps);
System.out.println(urlCode);
return "";
}直接在浏览器中访问此接口，控制台打印以下信息：
接收到以上返回信息后我们将code_url对应的链接地址转成二维码，然后用微信中的扫一扫，扫码生成的二维码进行支付。
我们点击立即支付，输入密码完成支付。
在我们完成支付的同时，微信会调用我们的回调接口。告诉我们支付结果，我们就可以根据这个支付结果进行业务处理，同时告知微信端我们收到了支付结果通知。
另附上用户支付完成是控制台打印的信息：
