微信原生支付（native）模式二

最近搞扫码支付，下面把参考各种资料做出来的微信原生支付模式二的方法贴出来，以供参考。

public String createQrCode() {
        String qrCodeUrl = weChatPayService.payNative2();
        if (StringUtil.isEmpty(qrCodeUrl)) {
            flag = false;
        } else {
            String path =       ServletActionContext.getRequest().getSession()
                    .getServletContext().getRealPath("/")
                    + "/" + "qrCode";

            flag = QrcodeUtil.createQrcode(qrCodeUrl, path, "付款二维码");
        }
        return SUCCESS;
    }

import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.ServletActionContext;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;


public class WeChatPayServiceImpl implements IWeChatPayService {

    @Override
    public String createPayment(String xml) {
        String resXml = HttpUtil.postData(CommonValue.gateUrl, xml, null);
        return resXml;
    }

    @Override
    public String payNative2() {
        // TODO 生成订单

        // 生成订单结束

        // 调用统一下单
        String qrCodeUrl = "";
        HttpServletRequest request = ServletActionContext.getRequest();
        StringBuilder addr = new StringBuilder("http://");
        addr.append(request.getServerName());// 服务器IP地址

        if (request.getServerPort() != 80) {
            addr.append(":" + request.getServerPort());// 端口号
        }
        addr.append(request.getContextPath() + "/");// 项目名
        String notifyUrl = addr.toString() + "qrCreate!wxNotify.action";
        SortedMap postDate = new TreeMap();
        // 生成订单所需参数
        postDate.put("appid", CommonValue.APPID);// 微信分配的公众账号 ID
        postDate.put("mch_id", CommonValue.MCH_ID);// 微信支付分配的商户号
        postDate.put("nonce_str", "linchuncheng");// 随机字符串，随便填，String(32)
        postDate.put("body", "支付测试");// 商品描述，String(32)
        postDate.put("notify_url",notifyUrl);// 接收微信支付异步通知回调地址
        postDate.put("trade_type", "NATIVE");// 交易类型
        postDate.put("total_fee", "1");// 总费用，整数，单位：分
        postDate.put("product_id", "123456");// 商品id，商户自行定义
        postDate.put("out_trade_no", "123114");// 商户系统内部的订单号,商户自行定义
        postDate.put("spbill_create_ip", "127.0.0.1");// 提交订单的IP（本地ip），这里不该填127.0.0.1.应填实际的本地外网ip。但本人实验时由于是公司内网，填的ip有效无效没有考证
        // 生成签名
        String sign = "";
        sign = Signature.getSign(postDate, CommonValue.KEY);
        postDate.put("sign", sign);

        // 将postDate转化成xml
        String xml = XMLUtil.parseToXML(postDate);
        System.out.println(xml);

        String resXml = "";
        resXml = createPayment(xml);

        System.out.println(resXml);
        // 处理结果
        try {
            Document doc = DocumentHelper.parseText(resXml);
            if ("FAIL".equals(doc.getRootElement().element("return_code")
                    .getText())) {
                System.out.println(doc.getRootElement().element("return_msg")
                        .getText());
            } else if ("SUCCESS".equals(doc.getRootElement()
                    .element("return_code").getText())) {
                if ("SUCCESS".equals(doc.selectSingleNode("/xml/result_code")
                        .getText())) {
                    qrCodeUrl = doc.selectSingleNode("/xml/code_url").getText();
                }else if ("FAIL".equals(doc.selectSingleNode("/xml/result_code").getText())) {
                    System.out.println("err_code:" + doc.selectSingleNode("/xml/err_code").getText());
                    System.out.println("err_code_des:" + doc.selectSingleNode("/xml/err_code_des").getText());
                }
            }
            return qrCodeUrl;
        } catch (DocumentException e) {
            e.printStackTrace();
        }
        return null;
    }

    public void weixin_notify() throws Exception{  
        HttpServletRequest request = ServletActionContext.getRequest();
        HttpServletResponse response = ServletActionContext.getResponse();
        //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  
        SortedMap m = new TreeMap();
        m = XMLUtil.doXMLParse(sb.toString());  

        //过滤空 设置 TreeMap  
        SortedMap packageParams = new TreeMap();        
        Iterator it = m.keySet().iterator();  
        while (it.hasNext()) {  
            String parameter = (String) it.next();  
            Object parameterValue = m.get(parameter);  

            String v = "";  
            if(null != parameterValue) {  
                v = parameterValue.toString().trim();  
            }  
            packageParams.put(parameter, v);  
        }  

        // 账号信息  
        String key = CommonValue.KEY; // key  

        //判断签名是否正确  
        if(Signature.isWxSign("UTF-8", packageParams)) {  
            //------------------------------  
            //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////////////////  
                String mch_id = (String)packageParams.get("mch_id");  
                String openid = (String)packageParams.get("openid");  
                String is_subscribe = (String)packageParams.get("is_subscribe");  
                String out_trade_no = (String)packageParams.get("out_trade_no");  

                String total_fee = (String)packageParams.get("total_fee");  

                System.out.println("mch_id:"+mch_id);  
                System.out.println("openid:"+openid);  
                System.out.println("is_subscribe:"+is_subscribe);  
                System.out.println("out_trade_no:"+out_trade_no);  
                System.out.println("total_fee:"+total_fee);  

                //////////执行自己的业务逻辑////////////////  

                System.out.println("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 = "" + ""  
                        + "" + " ";  

            } else {  
                System.out.println("支付失败,错误信息：" + packageParams.get("err_code"));  
                resXml = "" + ""  
                        + "" + " ";  
            }  
            //------------------------------  
            //处理业务完毕  
            //------------------------------  
            BufferedOutputStream out = new BufferedOutputStream(  
                    response.getOutputStream());  
            out.write(resXml.getBytes());  
            out.flush();  
            out.close();  
        } else{  
            System.out.println("通知签名验证失败");  
        }  

    } 

}

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(), CommonValue.DEFAULT_ENCODING);
            if (data == null)
                data = "";
            writer.write(data);
            writer.flush();
            writer.close();

            reader = new BufferedReader(new InputStreamReader(
                    conn.getInputStream(), CommonValue.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) {
            System.out.println("Error connecting to " + urlStr + ": "
                    + e.getMessage());
        } finally {
            try {
                if (reader != null)
                    reader.close();
            } catch (IOException e) {
            }
        }
        return null;
    }

 public static String getSign(Map map,String key){
        ArrayList list = new ArrayList();
        for(Map.Entry entry:map.entrySet()){
            if(entry.getValue()!=""){
                list.add(entry.getKey() + "=" + entry.getValue() + "&");
            }
        }
        int size = list.size();
        String [] arrayToSort = list.toArray(new String[size]);
        Arrays.sort(arrayToSort, String.CASE_INSENSITIVE_ORDER);
        StringBuilder sb = new StringBuilder();
        for(int i = 0; i < size; i ++) {
            sb.append(arrayToSort[i]);
        }
        String result = sb.toString();
        result += "key=" + key;
        //Util.log("Sign Before MD5:" + result);
        result = MD5.MD5Encode(result).toUpperCase();
        //Util.log("Sign Result:" + result);
        return result;
    }

public static String parseToXML(SortedMap date){
        StringBuffer sbxml = new StringBuffer("");
        Iterator it = date.entrySet().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) && !"appkey".equals(k)) {
                if ("attach".equalsIgnoreCase(k)
                        || "body".equalsIgnoreCase(k)
                        || "sign".equalsIgnoreCase(k)) {
                    sbxml.append("<" builder="new" children="" doc="builder.build(in);" document="" e="(Element)" element="" else="" encoding="\"UTF-8\"");" in="new" inputstream="" ioexception="" it="children.iterator();" iterator="" jdomexception="" k="e.getName();" list="e.getChildren();" m="new" name="" null="=" param="" public="" return="" root="doc.getRootElement();" saxbuilder="" sb="new" sortedmap="" static="" string="" stringbuffer="" strxml="" throws="" v="XMLUtil.getChildrenText(children);" value="e.getTextNormalize();" xml="">");  
            }  
        }  

        return sb.toString();  
    } 

import java.io.File;

import java.util.HashMap;
import java.util.Map;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;

public class QrcodeUtil {
    /**
     * 功能描述：生成二维码
     */
    public static boolean createQrcode(String content,String path,String fileName) {
        try {
             MultiFormatWriter multiFormatWriter = new MultiFormatWriter();

             Map hints = new HashMap();
             hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
             BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, 400, 400,hints);
            File dir = new File(path);
            if(!dir.exists()){
                dir.mkdirs();
            }
             File file1 = new File(path,fileName+".jpg");
             MatrixToImageWriter.writeToFile(bitMatrix, "jpg", file1);
         } catch (Exception e) {
             e.printStackTrace();
         }
        return true;
    }
}