# 统一收单交易创建接口 - JAVA 示例

## 请求示例

```java
package com.java.sdk.demo;

import com.alipay.api.AlipayApiException;
import com.alipay.api.AlipayClient;
import com.alipay.api.DefaultAlipayClient;
import com.alipay.api.AlipayConfig;
import com.alipay.api.response.AlipayTradeCreateResponse;
import com.alipay.api.domain.AlipayTradeCreateModel;
import com.alipay.api.request.AlipayTradeCreateRequest;
import com.alipay.api.domain.ExtendParams;

import com.alipay.api.FileItem;
import java.util.Base64;
import java.util.ArrayList;
import java.util.List;

public class AlipayTradeCreate {

    public static void main(String[] args) throws AlipayApiException {
        // 初始化SDK
        AlipayClient alipayClient = new DefaultAlipayClient(getAlipayConfig());

        // 构造请求参数以调用接口
        AlipayTradeCreateRequest request = new AlipayTradeCreateRequest();
        AlipayTradeCreateModel model = new AlipayTradeCreateModel();
        
        // 设置商户订单号
        model.setOutTradeNo("20150320010101001");
        
        // 设置产品码
        model.setProductCode("JSAPI_PAY");
        
        // 设置小程序支付中
        model.setOpAppId("2014072300007148");
        
        // 设置订单总金额
        model.setTotalAmount("88.88");
        
        // 设置业务扩展参数
        ExtendParams extendParams = new ExtendParams();
        extendParams.setTradeComponentOrderId("2023060801502300000008810000005657");
        model.setExtendParams(extendParams);
        
        // 设置可打折金额
        model.setDiscountableAmount("80.00");
        
        // 设置订单标题
        model.setSubject("Iphone6 16G");
        
        // 设置订单附加信息
        model.setBody("Iphone6 16G");
        
        // uid参数未来计划废弃，存量商户可继续使用，新商户请使用openid。请根据应用-开发配置-openid配置选择支持的字段。
        // model.setBuyerId("2088102146225135");
        
        // 设置买家支付宝用户唯一标识
        model.setBuyerOpenId("074a1CcTG1LelxKe4xQC0zgNdId0nxi95b5lsNpazWYoCo5");
        
        // 设置商户门店编号
        model.setStoreId("NJ_001");
        
        request.setBizModel(model);
        // 第三方代调用模式下请设置app_auth_token
        // request.putOtherTextParam("app_auth_token", "<-- 请填写应用授权令牌 -->");

        AlipayTradeCreateResponse response = alipayClient.execute(request);
        System.out.println(response.getBody());

        if (response.isSuccess()) {
            System.out.println("调用成功");
        } else {
            System.out.println("调用失败");
            // sdk版本是"4.38.0.ALL"及以上,可以参考下面的示例获取诊断链接
            // String diagnosisUrl = DiagnosisUtils.getDiagnosisUrl(response);
            // System.out.println(diagnosisUrl);
        }
    }

    private static AlipayConfig getAlipayConfig() {
        String privateKey  = "<-- 请填写您的应用私钥，例如：MIIEvQIBADANB ... ... -->";
        String alipayPublicKey = "<-- 请填写您的支付宝公钥，例如：MIIBIjANBg... -->";
        AlipayConfig alipayConfig = new AlipayConfig();
        alipayConfig.setServerUrl("https://openapi.alipay.com/gateway.do");
        alipayConfig.setAppId("<-- 请填写您的AppId，例如：2019091767145019 -->");
        alipayConfig.setPrivateKey(privateKey);
        alipayConfig.setFormat("json");
        alipayConfig.setAlipayPublicKey(alipayPublicKey);
        alipayConfig.setCharset("UTF-8");
        alipayConfig.setSignType("RSA2");
        return alipayConfig;
    }
}
```

## 响应示例
### 正常示例
```json
{
    "alipay_trade_create_response": {
        "code": "10000",
        "msg": "Success",
        "out_trade_no": "20150423001001",
        "trade_no": "2015042321001004720200028594"
    },
    "sign": "ERITJKEIJKJHKKKKKKKHJEREEEEEEEEEEE"
}
```

### 异常示例
```json
{
    "alipay_trade_create_response": {
        "code": "20000",
        "msg": "Service Currently Unavailable",
        "sub_code": "isp.unknow-error",
        "sub_msg": "系统繁忙"
    },
    "sign": "ERITJKEIJKJHKKKKKKKHJEREEEEEEEEEEE"
}
```