图片上传接口
更新时间:2025.09.01商户上传反馈图片的接口。
将媒体图片进行二进制转换,得到的媒体图片二进制内容,在请求body中上传此二进制内容。
媒体图片只支持JPG、BMP、PNG格式,文件大小不能超过2M。
接口说明
支持商户:【普通服务商】 【从业机构(银行)】 【从业机构(支付机构)】 【渠道商】 【清算机构】
请求方式:【POST】/v3/merchant-service/images/upload
请求域名:【主域名】https://api.mch.weixin.qq.com 使用该域名将访问就近的接入点
【备域名】https://api2.mch.weixin.qq.com 使用该域名将访问异地的接入点 ,指引点击查看
请求参数
Header HTTP头参数
Authorization 必填 string
请参考签名认证生成认证信息
Accept 必填 string
请设置为application/json
Content-Type 必填 string
请设置为multipart/form-data
Form 表单
file 必填 file
【图片文件】 将媒体图片进行二进制转换,得到的媒体图片二进制内容,在请求body中上传此二进制内容。媒体图片只支持jpg、bmp、png格式,文件大小不能超过2M
meta 必填 object
【媒体文件元信息】 包括文件名称和文件摘要
属性 | |
filename 必填 string(128) 【文件名称】 商户上传的媒体图片的名称,商户自定义,必须以JPG、BMP、PNG为后缀。 sha256 必填 string(256) 【文件摘要】 图片文件的文件摘要,即对图片文件的二进制内容进行sha256计算得到的值。 |
请求示例
POST
1curl -X POST \ 2 https://api.mch.weixin.qq.com/v3/merchant-service/images/upload \ 3 -H "Authorization: WECHATPAY2-SHA256-RSA2048 mchid=\"1900000001\",..." \ 4 -H "Accept: application/json" \ 5 -H "Content-Type: multipart/form-data" \ 6 -F file=@"/path/to/file" \ 7 -F meta="{ 8 "filename" : "filea.jpg", 9 "sha256" : "hjkahkjsjkfsjk78687dhjahdajhk" 10 }"
需配合微信支付工具库 WXPayUtility 使用,请参考Java
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/partner/4014985777 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 okhttp3.MultipartBody; 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 * 图片上传接口 25 */ 26public class CreateImages { 27 private static String HOST = "https://api.mch.weixin.qq.com"; 28 private static String METHOD = "POST"; 29 private static String PATH = "/v3/merchant-service/images/upload"; 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/partner/4013080340 33 CreateImages client = new CreateImages( 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/partner/4013080340 35 "1DDE55AD98Exxxxxxxxxx", // 商户API证书序列号,如何获取请参考 https://pay.weixin.qq.com/doc/v3/partner/4013058924 36 "/path/to/apiclient_key.pem", // 商户API证书私钥文件路径,本地文件路径 37 "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/partner/4013038589 38 "/path/to/wxp_pub.pem" // 微信支付公钥文件路径,本地文件路径 39 ); 40 41 CreateImagesRequest request = new CreateImagesRequest(); 42 request.file = "file_bytes".getBytes(); 43 request.meta = new ImageMetaInfo(); 44request.meta.filename = "filea.jpg"; 45request.meta.sha256 = "hjkahkjsjkfsjk78687dhjahdajhk"; 46 try { 47 CreateImagesResponse response = client.run(request); 48 // TODO: 请求成功,继续业务逻辑 49 System.out.println(response); 50 } catch (WXPayUtility.ApiException e) { 51 // TODO: 请求失败,根据状态码执行不同的逻辑 52 e.printStackTrace(); 53 } 54 } 55 56 public CreateImagesResponse run(CreateImagesRequest request) { 57 String uri = PATH; 58 // 构建multipart/form-data请求体 59 String metaJson = WXPayUtility.toJson(request.meta); 60 RequestBody metaPart = RequestBody.create(MediaType.parse("application/json"), metaJson); 61 // todo: you_file_name替换为meta里面的文件名字段 62 String contentType = WXPayUtility.getContentTypeByFileName("your_file_name"); 63 RequestBody filePart = RequestBody.create(MediaType.parse(contentType), request.file); 64 MultipartBody requestBody = new MultipartBody.Builder() 65 .setType(MultipartBody.FORM) 66 .addFormDataPart("meta", null, metaPart) 67 .addFormDataPart("file", "your_file_name", filePart) 68 .build(); 69 70 Request.Builder reqBuilder = new Request.Builder().url(HOST + uri); 71 reqBuilder.addHeader("Accept", "application/json"); 72 reqBuilder.addHeader("Wechatpay-Serial", wechatPayPublicKeyId); 73 reqBuilder.addHeader("Authorization", WXPayUtility.buildAuthorization(mchid, certificateSerialNo, privateKey, METHOD, uri, metaJson)); 74 reqBuilder.method(METHOD, requestBody); 75 Request httpRequest = reqBuilder.build(); 76 77 // 发送HTTP请求 78 OkHttpClient client = new OkHttpClient.Builder().build(); 79 try (Response httpResponse = client.newCall(httpRequest).execute()) { 80 String respBody = WXPayUtility.extractBody(httpResponse); 81 if (httpResponse.code() >= 200 && httpResponse.code() < 300) { 82 // 2XX 成功,验证应答签名 83 WXPayUtility.validateResponse(this.wechatPayPublicKeyId, this.wechatPayPublicKey, 84 httpResponse.headers(), respBody); 85 86 // 从HTTP应答报文构建返回数据 87 return WXPayUtility.fromJson(respBody, CreateImagesResponse.class); 88 } else { 89 throw new WXPayUtility.ApiException(httpResponse.code(), respBody, httpResponse.headers()); 90 } 91 } catch (IOException e) { 92 throw new UncheckedIOException("Sending request to " + uri + " failed.", e); 93 } 94 } 95 96 private final String mchid; 97 private final String certificateSerialNo; 98 private final PrivateKey privateKey; 99 private final String wechatPayPublicKeyId; 100 private final PublicKey wechatPayPublicKey; 101 102 public CreateImages(String mchid, String certificateSerialNo, String privateKeyFilePath, String wechatPayPublicKeyId, String wechatPayPublicKeyFilePath) { 103 this.mchid = mchid; 104 this.certificateSerialNo = certificateSerialNo; 105 this.privateKey = WXPayUtility.loadPrivateKeyFromPath(privateKeyFilePath); 106 this.wechatPayPublicKeyId = wechatPayPublicKeyId; 107 this.wechatPayPublicKey = WXPayUtility.loadPublicKeyFromPath(wechatPayPublicKeyFilePath); 108 } 109 110 public static class CreateImagesRequest { 111 @SerializedName("file") 112 public byte[] file; 113 114 @SerializedName("meta") 115 public ImageMetaInfo meta; 116 } 117 118 public static class CreateImagesResponse { 119 @SerializedName("media_id") 120 public String mediaId; 121 } 122 123 public static class ImageMetaInfo { 124 @SerializedName("filename") 125 public String filename; 126 127 @SerializedName("sha256") 128 public String sha256; 129 } 130 131} 132
需配合微信支付工具库 wxpay_utility 使用,请参考Go
1package main 2 3import ( 4 "bytes" 5 "demo/wxpay_utility" // 引用微信支付工具库,参考 https://pay.weixin.qq.com/doc/v3/partner/4015119446 6 "encoding/json" 7 "fmt" 8 "mime" 9 "mime/multipart" 10 "net/http" 11 "net/textproto" 12 "net/url" 13 "path/filepath" 14) 15 16func main() { 17 // TODO: 请准备商户开发必要参数,参考:https://pay.weixin.qq.com/doc/v3/partner/4013080340 18 config, err := wxpay_utility.CreateMchConfig( 19 "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/partner/4013080340 20 "1DDE55AD98Exxxxxxxxxx", // 商户API证书序列号,如何获取请参考 https://pay.weixin.qq.com/doc/v3/partner/4013058924 21 "/path/to/apiclient_key.pem", // 商户API证书私钥文件路径,本地文件路径 22 "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/partner/4013038589 23 "/path/to/wxp_pub.pem", // 微信支付公钥文件路径,本地文件路径 24 ) 25 if err != nil { 26 fmt.Println(err) 27 return 28 } 29 30 request := &CreateImagesRequest{ 31 File: wxpay_utility.Bytes([]byte("file data")), 32 Meta: &ImageMetaInfo{ 33 Filename: wxpay_utility.String("filea.jpg"), 34 Sha256: wxpay_utility.String("hjkahkjsjkfsjk78687dhjahdajhk"), 35 }, 36 } 37 38 response, err := CreateImages(config, request) 39 if err != nil { 40 fmt.Printf("请求失败: %+v\n", err) 41 // TODO: 请求失败,根据状态码执行不同的处理 42 return 43 } 44 45 // TODO: 请求成功,继续业务逻辑 46 fmt.Printf("请求成功: %+v\n", response) 47} 48 49func CreateImages(config *wxpay_utility.MchConfig, request *CreateImagesRequest) (response *CreateImagesResponse, err error) { 50 const ( 51 host = "https://api.mch.weixin.qq.com" 52 method = "POST" 53 path = "/v3/merchant-service/images/upload" 54 ) 55 56 reqUrl, err := url.Parse(fmt.Sprintf("%s%s", host, path)) 57 if err != nil { 58 return nil, err 59 } 60 // 构造 multipart/form-data 请求体 61 body := &bytes.Buffer{} 62 writer := multipart.NewWriter(body) 63 64 // todo: your_file_name替换为meta里面的文件名字段 65 fileHeader := make(textproto.MIMEHeader) 66 fileHeader.Set("Content-Disposition", fmt.Sprintf(`form-data; name="file"; filename="%s"`, "your_file_name")) 67 ext := filepath.Ext("your_file_name") 68 contentType := mime.TypeByExtension(ext) 69 if contentType == "" { 70 contentType = "application/octet-stream" 71 } 72 fileHeader.Set("Content-Type", contentType) 73 fileWriter, err := writer.CreatePart(fileHeader) 74 if err != nil { 75 return nil, err 76 } 77 _, err = fileWriter.Write(*request.File) 78 if err != nil { 79 return nil, err 80 } 81 82 // meta 字段 83 metaJSON, err := json.Marshal(request.Meta) 84 if err != nil { 85 return nil, err 86 } 87 metaWriter, err := writer.CreateFormField("meta") 88 if err != nil { 89 return nil, err 90 } 91 _, err = metaWriter.Write(metaJSON) 92 if err != nil { 93 return nil, err 94 } 95 96 err = writer.Close() 97 if err != nil { 98 return nil, err 99 } 100 httpRequest, err := http.NewRequest(method, reqUrl.String(), body) 101 if err != nil { 102 return nil, err 103 } 104 httpRequest.Header.Set("Accept", "application/json") 105 httpRequest.Header.Set("Wechatpay-Serial", config.WechatPayPublicKeyId()) 106 httpRequest.Header.Set("Content-Type", writer.FormDataContentType()) 107 // 签名时使用 meta JSON 108 metaJson, err := json.Marshal(request.Meta) 109 if err != nil { 110 return nil, err 111 } 112 authorization, err := wxpay_utility.BuildAuthorization(config.MchId(), config.CertificateSerialNo(), config.PrivateKey(), method, reqUrl.RequestURI(), metaJson) 113 if err != nil { 114 return nil, err 115 } 116 httpRequest.Header.Set("Authorization", authorization) 117 118 client := &http.Client{} 119 httpResponse, err := client.Do(httpRequest) 120 if err != nil { 121 return nil, err 122 } 123 respBody, err := wxpay_utility.ExtractResponseBody(httpResponse) 124 if err != nil { 125 return nil, err 126 } 127 if httpResponse.StatusCode >= 200 && httpResponse.StatusCode < 300 { 128 // 2XX 成功,验证应答签名 129 err = wxpay_utility.ValidateResponse( 130 config.WechatPayPublicKeyId(), 131 config.WechatPayPublicKey(), 132 &httpResponse.Header, 133 respBody, 134 ) 135 if err != nil { 136 return nil, err 137 } 138 response := &CreateImagesResponse{} 139 if err := json.Unmarshal(respBody, response); err != nil { 140 return nil, err 141 } 142 143 return response, nil 144 } else { 145 return nil, wxpay_utility.NewApiException( 146 httpResponse.StatusCode, 147 httpResponse.Header, 148 respBody, 149 ) 150 } 151} 152 153type CreateImagesRequest struct { 154 File *[]byte `json:"file,omitempty"` 155 Meta *ImageMetaInfo `json:"meta,omitempty"` 156} 157 158type CreateImagesResponse struct { 159 MediaId *string `json:"media_id,omitempty"` 160} 161 162type ImageMetaInfo struct { 163 Filename *string `json:"filename,omitempty"` 164 Sha256 *string `json:"sha256,omitempty"` 165} 166
应答参数
200 OK
media_id 必填 string(512)
【媒体文件标识Id】 微信返回的媒体文件标识Id,用于提交交易投诉反馈时填写
应答示例
200 OK
1{ 2 "media_id" : "file752398_7983424" 3} 4
错误码
公共错误码