1. Material upload

First of all, there are certain specifications for uploading materials. For specific specifications, please refer to the official document of the WeChat public account.

https://developers.weixin.qq.com/doc/offiaccount/Asset_Management/New_temporary_materials.html

Interface call request description

http请求方式：POST/FORM，使用https https://api.weixin.qq.com/cgi-bin/media/upload?access_token=ACCESS_TOKEN&type=TYPE 
调用示例（使用curl命令，用FORM表单方式上传一个多媒体文件）：
 curl -F [email protected] "https://api.weixin.qq.com/cgi-bin/media/upload?access_token=ACCESS_TOKEN&type=TYPE"

Note: The call of this request is the submission call of the Form form. Although it is also a Post call, it needs to be processed separately.

First write the file upload information:

The process of uploading files is like this.

Create a link (long link) -> upload a file (the file is divided into header information, information about the file itself, and tail information) -> get the information returned by the WeChat server through the connection.

/基础信息处理（这块根据自己的情况定）
String url= "https://api.weixin.qq.com/cgi-bin/media/upload?access_token=ACCESS_TOKEN&type=TYPE";
String ACCESS_TOKEN ="42_dKlAQhM_ZDheqRj0CfT1t8iItzigdNezTAqB9oWNDsThoGJy5ZqnR7_jyssyFAaI6Qy6xNpI1-ZoKoRhQfmp9uAZyieNJ0IV2tkUZlAjmI21_pM7MFSIWRt2w2095zu-rM2eNAt6_NLtY6egYXPcADAUTL";
String path = "G:\\1.jpg";
String type= "image";
File file = new File(path);
url = url.replace("ACCESS_TOKEN",ACCESS_TOKEN).replace("TYPE",type);
//创建链接（组装连接信息等）
URL url1 = new URL(url);
// 因为调用的是HTTP的请求所以这块需要进行类型转换下
HttpsURLConnection conn = (HttpsURLConnection) url1.openConnection();
//设置连接的信息
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
//设置请求头信息
conn.setRequestProperty("Connection","Keep-Alive");
conn.setRequestProperty("Charset","utf8");
//设置数据边界
String boundary = "-------"+System.currentTimeMillis();
conn.setRequestProperty("Content-Type","multipart/form-data;boundary"+boundary);

// 组装数据信息-----------------------------------------------------------------------
 //获取输出流
 OutputStream out = conn.getOutputStream();
 //创建输入流
 InputStream in = new FileInputStream(file);
 //准备数据
 StringBuilder sb = new StringBuilder();
 sb.append("--");
 sb.append(boundary);
 sb.append("\r\n");
 sb.append("Content-Disposition:form-data;name=\"media\";filename=\""+file.getName()+"\"\r\n");
 sb.append("Content-Type:application/octet-stream\r\n\r\n");
 out.write(sb.toString().getBytes());
 //写文件的内容
 byte [] b = new byte[1024];
 int leng;
 while ((leng = in.read(b))!=-1){
//    System.out.println(new String(b,0,leng));
//    out.write(new String(b,0,leng).getBytes("utf8"));
      out.write(b,0,leng);
  }
  //写尾部信息
  String foot = "\r\n--"+boundary+"--\r\n";
  out.write(foot.getBytes());
  out.flush();
  out.close();
//获取连接返回的信息  
//读取数据
InputStream inputStream = conn.getInputStream();
StringBuilder sb1 = new StringBuilder();
while ((leng = inputStream.read(b))!=-1){
    sb1.append(new String(b,0,leng));
}
System.out.println(sb1.toString());

The test results are as follows:

2. Material download

The material download function is not written, and the main thing is to get the file through the following request call.

Interface call request description

http请求方式: GET,https调用 https://api.weixin.qq.com/cgi-bin/media/get?access_token=ACCESS_TOKEN&media_id=MEDIA_ID 
请求示例（示例为通过curl命令获取多媒体文件） 
curl -I -G "https://api.weixin.qq.com/cgi-bin/media/get?access_token=ACCESS_TOKEN&media_id=MEDIA_ID"

Replace the ACCESS_TOKEN and MEDIA_ID data and visit directly in the browser to download the corresponding uploaded picture.

08-WeChat public account material management

1. Material upload

2. Material download

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