支付宝的pc端支付全流程的java开发代码及vue30的前端开发代码具体怎么写 不对 你这个并没有返回扫码支付的二维码并且也写上后端接口返回支付的二维码的流程及java代码

以下是支付宝PC端支付全流程的Java开发代码和Vue3.0的前端开发代码。同时，也包含了返回扫码支付的二维码和后端接口返回支付的二维码的流程及Java代码。

Java后端开发代码：

1.构建请求参数

public static Map<String, String> buildRequestParams() {
    // 公共请求参数
    Map<String, String> params = new HashMap<>();
    params.put("app_id", "your_app_id");
    params.put("method", "alipay.trade.page.pay");
    params.put("format", "JSON");
    params.put("charset", "utf-8");
    params.put("sign_type", "RSA2");
    params.put("timestamp", "当前时间");
    params.put("version", "1.0");
    params.put("notify_url", "你的回调地址");

    // 业务请求参数
    Map<String, String> bizContent = new HashMap<>();
    bizContent.put("out_trade_no", "订单号");
    bizContent.put("product_code", "FAST_INSTANT_TRADE_PAY");
    bizContent.put("total_amount", "订单金额");
    bizContent.put("subject", "订单标题");
    params.put("biz_content", JSON.toJSONString(bizContent));

    return params;
}

2.生成签名

public static String sign(Map<String, String> params, String privateKey) {
    // 将参数按照key进行排序
    List<String> keys = new ArrayList<>(params.keySet());
    Collections.sort(keys);

    // 拼接参数
    StringBuilder sb = new StringBuilder();
    for (String key : keys) {
        String value = params.get(key);
        if (StringUtils.isNotEmpty(value) && !"sign".equals(key) && !"sign_type".equals(key)) {
            sb.append(key).append("=").append(value).append("&");
        }
    }
    String signStr = sb.substring(0, sb.length() - 1);

    // 生成签名
    try {
        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(Base64.decodeBase64(privateKey));
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec);
        Signature signature = Signature.getInstance("SHA256WithRSA");
        signature.initSign(priKey);
        signature.update(signStr.getBytes(StandardCharsets.UTF_8));
        byte[] signBytes = signature.sign();
        return Base64.encodeBase64String(signBytes);
    } catch (Exception e) {
        throw new RuntimeException("生成签名失败", e);
    }
}

3.发起请求

public static String execute(Map<String, String> params, String privateKey) {
    // 生成签名
    params.put("sign", sign(params, privateKey));

    // 发起请求
    HttpClient httpClient = HttpClientBuilder.create().build();
    try {
        HttpPost httpPost = new HttpPost("https://openapi.alipay.com/gateway.do");
        List<NameValuePair> nameValuePairList = new ArrayList<>();
        for (Map.Entry<String, String> entry : params.entrySet()) {
            nameValuePairList.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
        }
        httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairList, StandardCharsets.UTF_8));
        HttpResponse httpResponse = httpClient.execute(httpPost);
        HttpEntity httpEntity = httpResponse.getEntity();
        return EntityUtils.toString(httpEntity, StandardCharsets.UTF_8);
    } catch (Exception e) {
        throw new RuntimeException("请求支付宝接口失败", e);
    }
}

4.解析响应

public static String parseResponse(String response) {
    JSONObject jsonObject = JSON.parseObject(response);
    JSONObject alipayTradePagePayResponse = jsonObject.getJSONObject("alipay_trade_page_pay_response");
    if (alipayTradePagePayResponse != null) {
        return alipayTradePagePayResponse.getString("qr_code");
    } else {
        JSONObject errorResponse = jsonObject.getJSONObject("error_response");
        String subCode = errorResponse.getString("sub_code");
        String subMsg = errorResponse.getString("sub_msg");
        throw new RuntimeException("请求支付宝接口失败：" + subCode + " " + subMsg);
    }
}

5.整合代码

public static String alipay() {
    // 构建请求参数
    Map<String, String> params = buildRequestParams();

    // 生成签名
    String privateKey = "你的私钥";
    params.put("sign", sign(params, privateKey));

    // 发起请求
    HttpClient httpClient = HttpClientBuilder.create().build();
    try {
        HttpPost httpPost = new HttpPost("https://openapi.alipay.com/gateway.do");
        List<NameValuePair> nameValuePairList = new ArrayList<>();
        for (Map.Entry<String, String> entry : params.entrySet()) {
            nameValuePairList.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
        }
        httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairList, StandardCharsets.UTF_8));
        HttpResponse httpResponse = httpClient.execute(httpPost);
        HttpEntity httpEntity = httpResponse.getEntity();
        String response = EntityUtils.toString(httpEntity, StandardCharsets.UTF_8);

        // 解析响应
        JSONObject jsonObject = JSON.parseObject(response);
        JSONObject alipayTradePagePayResponse = jsonObject.getJSONObject("alipay_trade_page_pay_response");
        if (alipayTradePagePayResponse != null) {
            return alipayTradePagePayResponse.getString("qr_code");
        } else {
            JSONObject errorResponse = jsonObject.getJSONObject("error_response");
            String subCode = errorResponse.getString("sub_code");
            String subMsg = errorResponse.getString("sub_msg");
            throw new RuntimeException("请求支付宝接口失败：" + subCode + " " + subMsg);
        }
    } catch (Exception e) {
        throw new RuntimeException("请求支付宝接口失败", e);
    }
}

Vue3.0前端开发代码：

1.调用后端接口

import axios from 'axios'

export function getAlipayQrCode() {
  return axios.get('/api/alipay')
}

2.渲染二维码

<template>
  <div>
    <div v-if="qrCodeUrl">
      <img :src="qrCodeUrl" alt="二维码">
    </div>
    <div v-else>
      <button @click="pay">支付</button>
    </div>
  </div>
</template>

<script>
import { getAlipayQrCode } from '@/api'

export default {
  data() {
    return {
      qrCodeUrl: ''
    }
  },
  methods: {
    pay() {
      getAlipayQrCode().then(res => {
        this.qrCodeUrl = res.data
      })
    }
  }
}
</script>

后端接口开发代码：

@RestController
@RequestMapping("/api")
public class AlipayController {
    @GetMapping("/alipay")
    public String alipay() {
        return AlipayUtil.alipay();
    }
}

说明：

1.buildRequestParams()方法中，需要填写你的appId、订单号、订单金额、订单标题和回调地址。

2.sign()方法中，需要填写你的私钥。

3.execute()方法中，请求支付宝接口的URL为https://openapi.alipay.com/gateway.do，需要填写你的应用公钥证书序列号。

4.parseResponse()方法中，只解析了二维码URL，如果需要解析其他信息，请自行添加。

5.前端代码中，需要填写正确的后端接口地址