微信支付--商戶二維碼支付(JAVA)

先創建Springboot項目

已上傳至github庫 https://github.com/gaoruiqiang2017/weixinpay.git

pom文件添加依賴

        <!--微信支付SDK-->
        <dependency>
            <groupId>com.github.wxpay</groupId>
            <artifactId>wxpay-sdk</artifactId>
            <version>0.0.3</version>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.5</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.47</version>
        </dependency>
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>core</artifactId>
            <version>3.3.0</version>
        </dependency>
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>javase</artifactId>
            <version>3.0.0</version>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.6</version>
        </dependency>

utils工具類(可使用自己項目的)

public class HttpUtil {

    public static String doPost(String url, String requestXml) {
        CloseableHttpClient httpClient = null;
        CloseableHttpResponse httpResponse = null;
        //創建httpClient連接對象
        httpClient = HttpClients.createDefault();
        //創建post請求連接對象
        HttpPost httpPost = new HttpPost(url);
        //創建連接請求對象,並設置連接參數
        RequestConfig requestConfig = RequestConfig.custom()
                .setConnectTimeout(15000)   //連接服務區主機超時時間
                .setConnectionRequestTimeout(60000) //連接請求超時時間
                .setSocketTimeout(60000).build(); //設置讀取響應數據超時時間
        //爲httppost請求設置參數
        httpPost.setConfig(requestConfig);
        //將上傳參數放到entity屬性中
        httpPost.setEntity(new StringEntity(requestXml, "UTF-8"));
        //添加頭信息
        httpPost.addHeader("Content-type", "text/xml");
        String result = "";
        try {
            //發送請求
            httpResponse = httpClient.execute(httpPost);
            //從相應對象中獲取返回內容
            HttpEntity entity = httpResponse.getEntity();
            result = EntityUtils.toString(entity, "UTF-8");
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;

    }

Controller接口

@RestController
@RequestMapping("/weixinpay")
public class Weixinpay {
    
 

    @Value("${appid}")
    private String appid;  //公衆賬號id

    @Value("${mchid}")
    private String mchId;  //商戶號

    @Value("${weixinKey}")
    private String weixinKey;  //密匙

    @Value("${unifiedorderUrl}")
    private String unifiedorderUrl; //統一下單接口

    /**
     * @param httpServletRequest
     * @param httpServletResponse
     * @param orderNo             訂單號 (前面要創建自己的訂單)
     * @param money               金額
     * @param body                商品內容
     */
    @RequestMapping("/pay")
    public void pay(HttpServletRequest httpServletRequest, HttpServletResponse
            httpServletResponse, String orderNo, String money, String body)
            throws Exception {
        try {
            HashMap<String, String> dataMap = new HashMap<>();
            dataMap.put("appid", appid); //公衆賬號ID
            dataMap.put("mch_id", mchId); //商戶號
            dataMap.put("nonce_str", WXPayUtil.generateNonceStr()); //隨機字符串，長度要求在32位以內。
            dataMap.put("body", body); //商品描述
            dataMap.put("out_trade_no", orderNo); //商品訂單號
            dataMap.put("total_fee", money); //商品金
            dataMap.put("spbill_create_ip", InetAddress.getLocalHost().getHostAddress()); //客戶端ip
            dataMap.put("notify_url", "www.baidu.com"); //通知地址(假設是百度)
            dataMap.put("trade_type", "NATIVE"); //交易類型
            dataMap.put("product_id", "1"); //trade_type=NATIVE時，此參數必傳。商品ID，商戶自行定義。
            //生成簽名
            String signature = WXPayUtil.generateSignature(dataMap, weixinKey);
            dataMap.put("sign", signature);//簽名
            //將類型爲map的參數轉換爲xml
            String requestXml = WXPayUtil.mapToXml(dataMap);
            //發送參數,調用微信統一下單接口,返回xml
            String responseXml = HttpUtil.doPost(unifiedorderUrl, requestXml);
            Map<String, String> map = WXPayUtil.xmlToMap(responseXml);
            if (map.get("return_code").toString().equals("SUCCESS") && map.get("result_code")
                    .toString().equals("SUCCESS")) {
                String urlCode = (String) map.get("code_url"); //微信二維碼短鏈接
                // 生成微信二維碼(或者直接傳給前端處理)
                Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
                // 內容所使用編碼
                hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
                BitMatrix bitMatrix = new MultiFormatWriter().encode(urlCode, BarcodeFormat
                        .QR_CODE, 300, 300, hints);
                // 生成二維碼
                MatrixToImageWriter.writeToFile(bitMatrix, "gif", new File("C:/downloads/二維碼文件" +
                        ".gif"));
            } else {
            }
        } catch (Exception e) {

        }
    }
	
	//自定義回調接口
    @RequestMapping("/notifyUrl")
    public String notifyUrl(String unifiedorderUrl, String requestXml) {
        System.out.print("h");
        //掃碼支付完成之後回調接口,修改訂單狀態
        return "回調成功";

    }
}