图片请求接口

1curl -X GET \
2  https://api.mch.weixin.qq.com/v3/merchant-service/images/ChsyMDAwMDAwMjAyNDExMDgxNTAyMjQ4MTU1MTgYBSCIk8y5BigBMAE4AQ%3D%3D \
3  -H "Authorization: WECHATPAY2-SHA256-RSA2048 mchid=\"1900000001\",..." \
4  -H "Accept: */*" \
5  --output media_data.bin 
6

1package com.java.demo;
2
3import com.java.utils.WXPayUtility; // 引用微信支付工具库，参考：https://pay.weixin.qq.com/doc/v3/merchant/4014931831
4
5import com.google.gson.annotations.SerializedName;
6import com.google.gson.annotations.Expose;
7import okhttp3.MediaType;
8import okhttp3.OkHttpClient;
9import okhttp3.Request;
10import okhttp3.RequestBody;
11import okhttp3.Response;
12
13import java.io.IOException;
14import java.io.InputStream;
15import java.io.UncheckedIOException;
16import java.security.PrivateKey;
17import java.security.PublicKey;
18import java.util.ArrayList;
19import java.util.HashMap;
20import java.util.List;
21import java.util.Map;
22
23/**
24 * 图片请求接口
25 */
26public class QueryImages {
27  private static String HOST = "https://api.mch.weixin.qq.com";
28  private static String METHOD = "GET";
29  private static String PATH = "/v3/merchant-service/images/{media_id}";
30
31  public static void main(String[] args) {
32    // TODO: 请准备商户开发必要参数，参考：https://pay.weixin.qq.com/doc/v3/merchant/4013070756
33    QueryImages client = new QueryImages(
34      "19xxxxxxxx",                    // 商户号，是由微信支付系统生成并分配给每个商户的唯一标识符，商户号获取方式参考 https://pay.weixin.qq.com/doc/v3/merchant/4013070756
35      "1DDE55AD98Exxxxxxxxxx",         // 商户API证书序列号，如何获取请参考 https://pay.weixin.qq.com/doc/v3/merchant/4013053053
36      "/path/to/apiclient_key.pem"     // 商户API证书私钥文件路径，本地文件路径
37          );
38
39    QueryImagesRequest request = new QueryImagesRequest();
40    request.mediaId = "ChsyMDAwMDAwMjAyNDExMDgxNTAyMjQ4MTU1MTgYBSCIk8y5BigBMAE4AQ%3D%3D";
41    try {
42        Response response = client.run(request);
43        // TODO: 请求成功，继续业务逻辑
44    } catch (WXPayUtility.ApiException e) {
45        // TODO: 请求失败，根据状态码执行不同的逻辑
46        e.printStackTrace();
47    }
48  }
49
50  public Response run(QueryImagesRequest request) {
51    String uri = PATH;
52    uri = uri.replace("{media_id}", WXPayUtility.urlEncode(request.mediaId));
53
54    Request.Builder reqBuilder = new Request.Builder().url(HOST + uri);
55    reqBuilder.addHeader("Accept", "*/*");
56    
57    reqBuilder.addHeader("Authorization", WXPayUtility.buildAuthorization(mchid, certificateSerialNo, privateKey, METHOD, uri, null));
58    reqBuilder.method(METHOD, null);
59    Request httpRequest = reqBuilder.build();
60
61    // 发送HTTP请求
62    OkHttpClient client = new OkHttpClient.Builder().build();
63    try {
64      Response httpResponse = client.newCall(httpRequest).execute();
65      if (httpResponse.code() >= 200 && httpResponse.code() < 300) {
66        return httpResponse;
67      } else {
68        String respBody = WXPayUtility.extractBody(httpResponse);
69        httpResponse.close(); // 非200时主动关闭
70        throw new WXPayUtility.ApiException(httpResponse.code(), respBody, httpResponse.headers());
71      }
72    } catch (IOException e) {
73      throw new UncheckedIOException("Sending request to " + uri + " failed.", e);
74    }
75  }
76
77  private final String mchid;
78  private final String certificateSerialNo;
79  private final PrivateKey privateKey;
80
81  public QueryImages(String mchid, String certificateSerialNo, String privateKeyFilePath) {
82    this.mchid = mchid;
83    this.certificateSerialNo = certificateSerialNo;
84    this.privateKey = WXPayUtility.loadPrivateKeyFromPath(privateKeyFilePath);
85  }
86
87  public static class QueryImagesRequest {
88    @SerializedName("media_id")
89    @Expose(serialize = false)
90    public String mediaId;
91  }
92  
93}
94

1package main
2
3import (
4	"demo/wxpay_utility" // 引用微信支付工具库，参考 https://pay.weixin.qq.com/doc/v3/merchant/4015119334
5	"encoding/json"
6	"fmt"
7	"io"
8	"net/http"
9	"net/url"
10	"strings"
11)
12
13func main() {
14	// TODO: 请准备商户开发必要参数，参考：https://pay.weixin.qq.com/doc/v3/merchant/4013070756
15	config, err := wxpay_utility.CreateMchConfig(
16		"19xxxxxxxx",                 // 商户号，是由微信支付系统生成并分配给每个商户的唯一标识符，商户号获取方式参考 https://pay.weixin.qq.com/doc/v3/merchant/4013070756
17		"1DDE55AD98Exxxxxxxxxx",      // 商户API证书序列号，如何获取请参考 https://pay.weixin.qq.com/doc/v3/merchant/4013053053
18		"/path/to/apiclient_key.pem", // 商户API证书私钥文件路径，本地文件路径
19		"PUB_KEY_ID_xxxxxxxxxxxxx",   // 微信支付公钥ID，如何获取请参考 https://pay.weixin.qq.com/doc/v3/merchant/4013038816
20		"/path/to/wxp_pub.pem",       // 微信支付公钥文件路径，本地文件路径
21	)
22	if err != nil {
23		fmt.Println(err)
24		return
25	}
26
27	request := &QueryImagesRequest{
28		MediaId: wxpay_utility.String("ChsyMDAwMDAwMjAyNDExMDgxNTAyMjQ4MTU1MTgYBSCIk8y5BigBMAE4AQ%3D%3D"),
29	}
30
31	response, err := QueryImages(config, request)
32	if err != nil {
33		fmt.Printf("请求失败: %+v\n", err)
34		// TODO: 请求失败，根据状态码执行不同的处理
35		return
36	}
37
38	// TODO: 请求成功，继续业务逻辑
39	fmt.Printf("请求成功: %+v\n", response)
40}
41
42func QueryImages(config *wxpay_utility.MchConfig, request *QueryImagesRequest) (response io.ReadCloser, err error) {
43	const (
44		host   = "https://api.mch.weixin.qq.com"
45		method = "GET"
46		path   = "/v3/merchant-service/images/{media_id}"
47	)
48
49	reqUrl, err := url.Parse(fmt.Sprintf("%s%s", host, path))
50	if err != nil {
51		return nil, err
52	}
53	reqUrl.Path = strings.Replace(reqUrl.Path, "{media_id}", url.PathEscape(*request.MediaId), -1)
54	httpRequest, err := http.NewRequest(method, reqUrl.String(), nil)
55	if err != nil {
56		return nil, err
57	}
58	httpRequest.Header.Set("Accept", "*/*")
59	httpRequest.Header.Set("Wechatpay-Serial", config.WechatPayPublicKeyId())
60	authorization, err := wxpay_utility.BuildAuthorization(config.MchId(), config.CertificateSerialNo(), config.PrivateKey(), method, reqUrl.RequestURI(), nil)
61	if err != nil {
62		return nil, err
63	}
64	httpRequest.Header.Set("Authorization", authorization)
65
66	client := &http.Client{}
67	httpResponse, err := client.Do(httpRequest)
68	if err != nil {
69		return nil, err
70	}
71	if httpResponse.StatusCode >= 200 && httpResponse.StatusCode < 300 {
72		if httpResponse.Body == nil {
73			return nil, fmt.Errorf("response body is nil")
74		}
75		// 注意：调用方在使用完返回的 io.ReadCloser 后必须调用 Close() 方法
76		return httpResponse.Body, nil
77	} else {
78		defer httpResponse.Body.Close()
79		respBody, err := wxpay_utility.ExtractResponseBody(httpResponse)
80		if err != nil {
81			return nil, err
82		}
83		return nil, wxpay_utility.NewApiException(
84			httpResponse.StatusCode,
85			httpResponse.Header,
86			respBody,
87		)
88	}
89}
90
91type QueryImagesRequest struct {
92	MediaId *string `json:"media_id,omitempty"`
93}
94
95func (o *QueryImagesRequest) MarshalJSON() ([]byte, error) {
96	type Alias QueryImagesRequest
97	a := &struct {
98		MediaId *string `json:"media_id,omitempty"`
99		*Alias
100	}{
101		// 序列化时移除非 Body 字段
102		MediaId: nil,
103		Alias:   (*Alias)(o),
104	}
105	return json.Marshal(a)
106}
107