Java实现微信扫码支付【方式二】

package com.wxpay.util;


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;
    }
}

package com.wxpay.util;


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" };

}


package com.wxpay.util;


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<Object, Object> 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<Object, Object> 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<Object, Object> parameters) {
        StringBuffer sb = new StringBuffer();
        sb.append("<xml>");
        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 + ">" + "<![CDATA[" + v + "]]></" + k + ">");
            } else {
                sb.append("<" + k + ">" + v + "</" + k + ">");
            }
        }
        sb.append("</xml>");
        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> 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;
    }

}

package com.wxpay.util;


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=ConfigProperties.get("APPID");
public static String APPID_APP=ConfigProperties.get("APPID_APP");
/**
* 微信支付的商户号
*/
public static String MCHID=ConfigProperties.get("MCHID");
public static String MCHID_APP=ConfigProperties.get("MCHID_APP");
/**
* 微信支付的API密钥
*/
public static String APIKEY=ConfigProperties.get("APIKEY");
public static String APIKEY_APP=ConfigProperties.get("APIKEY_APP");
/**
* 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=ConfigProperties.get("WECHAT_NOTIFY_URL_PC");
public static String WECHAT_NOTIFY_URL_APP=ConfigProperties.get("WECHAT_NOTIFY_URL_APP");
/**
* 微信下单API地址
*/
public static String UFDODER_URL=ConfigProperties.get("UFDODER_URL");
/**
* 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=ConfigProperties.get("WXPAY");

}

package com.wxpay.util;
/**
 * 微信支付需要的一些参数
 * @author chenp
 *
 */
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;//附加參數
public String memberid;//会员ID

}

package com.wxpay.util;


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();
    }

}



package com.wxpay.util;


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<Object,Object> packageParams = new TreeMap<Object,Object>();
        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");
}

}

/**
* 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 = "<xml>" + "<return_code><![CDATA[SUCCESS]]></return_code>"
                        + "<return_msg><![CDATA[OK]]></return_msg>" + "</xml> ";

            } else {
                lg.info("支付失败,错误信息：" + packageParams.get("err_code"));
                resXml = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>"
                        + "<return_msg><![CDATA[报文为空]]></return_msg>" + "</xml> ";
            }
            //------------------------------
            //处理业务完毕
            //------------------------------
            BufferedOutputStream out = new BufferedOutputStream(
                    response.getOutputStream());
            out.write(resXml.getBytes());
            out.flush();
            out.close();
        } else{
            lg.info("通知签名验证失败");
        }

    }