java微信小程序支付V2版本(亲测有效)-Toy模板网

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首先微信支付需要以下的字段,关于如何去获取微信支付的字段，网上一大把，注意（像商户号等重要字段不要泄露不要泄露）

MCHID(商户号) 就是商户注册之后，微信支付给你的唯一的数字

APPID(小程序的appid)

SSLFILE(微信支付需要申请证书，这个字段就是把申请的证书下载之后，存放在你服务器的某个文件夹的路径）

NOTIFYURL(支付成功之后，微信会给你这个url发送一条支付成功的消息)

APIKEY(证书的秘钥)

需要微信支付的jar包文章来源地址https://www.toymoban.com/news/detail-486235.html

     <dependency>
            <groupId>com.github.wxpay</groupId>
            <artifactId>wxpay-sdk</artifactId>
            <version>0.0.3</version>
        </dependency>
        <dependency>
            <groupId>com.github.binarywang</groupId>
            <artifactId>weixin-java-pay</artifactId>
            <version>3.8.0</version>
        </dependency>
        <dependency>
            <groupId>com.github.wechatpay-apiv3</groupId>
            <artifactId>wechatpay-apache-httpclient</artifactId>
            <version>0.4.7</version>
        </dependency>

2.开始微信支付的demo，首先看微信支付调用支付需要那些必传字段(注意顺序),可以通过这个地址查看https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_1

3.关于签名加密的方法(后续也会使用到)

public class MD5Util {
    private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5",
            "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };

    public 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 ) {

        return MD5Encode(origin,null);
    }
    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;
    }


}

4.将集合的数据进行xml处理

public static String getRequest(TreeMap<String, String> parameters)
            throws Exception {  //
        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 ("mch_id".equalsIgnoreCase(k) || "nonce_str".equalsIgnoreCase(k)
                    || "sign".equalsIgnoreCase(k)) {
                sb.append("<" + k + ">" + "<![CDATA[" + v + "]]></" + k + ">");
            } else {
                sb.append("<" + k + ">" + v + "</" + k + ">");
            }
        }
        sb.append("</xml>");
        return sb.toString();
    }

5.将加密的数据通过url发送给微信支付，成功之后微信支付会将需要的数据返回给你，这里的url是：

6.将微信支付返回的xml数据解析成集合，然后通过集合的key获取到值组装发给前端，大致流程就是这样的了。

  //xml解析
    public static TreeMap doXMLParse(String strxml) throws JDOMException, IOException {
        strxml = strxml.replaceFirst("encoding=\".*\"", "encoding=\"UTF-8\"");
        if(null == strxml || "".equals(strxml)) {
            return null;
        }
        TreeMap m = new TreeMap();
        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 = getChildrenText(children);
            }

            m.put(k, v);
        }

        //关闭流
        in.close();
        return m;
    }

    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(getChildrenText(list));
                }
                sb.append(value);
                sb.append("</" + name + ">");
            }
        }

        return sb.toString();
    }