主要通過java後臺直接向微信伺服器上傳本地圖片，直接上程式碼：

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import org.apache.http.client.ClientProtocolException;

public class Test {
    public static String postFile(String url, String filePath) {  
        File file = new File(filePath);  
 

        if (!file.exists())  
            return null;  
        String result = null;  
        try {  
            URL url1 = new URL(url);  
            HttpURLConnection conn = (HttpURLConnection) url1.openConnection();  
            conn.setConnectTimeout(5000);  
            conn.setReadTimeout(30000
 
);  
            conn.setDoOutput(true);  
            conn.setDoInput(true);  
            conn.setUseCaches(false);  
            conn.setRequestMethod("POST");  
            conn.setRequestProperty("Connection", "Keep-Alive");  
            conn.setRequestProperty("Cache-Control", "no-cache");  
            String boundary = "-----------------------------"
 
 + System.currentTimeMillis();  
            conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);  

            OutputStream output = conn.getOutputStream();  
            output.write(("--" + boundary + "\r\n").getBytes());  
            output.write(  
                    String.format("Content-Disposition: form-data; name=\"media\"; filename=\"%s\"\r\n", file.getName())  
                            .getBytes());  
            output.write("Content-Type: image/jpeg \r\n\r\n".getBytes());  
            byte[] data = new byte[1024];  
            int len = 0;  
            FileInputStream input = new FileInputStream(file);  
            while ((len = input.read(data)) > -1) {  
                output.write(data, 0, len);  
            }  
            output.write(("\r\n--" + boundary + "\r\n\r\n").getBytes());  
            output.flush();  
            output.close();  
            input.close();  
            InputStream resp = conn.getInputStream();  
            StringBuffer sb = new StringBuffer();  
            while ((len = resp.read(data)) > -1)  
                sb.append(new String(data, 0, len, "utf-8"));  
            resp.close();  
            result = sb.toString();  
            System.out.println(result);  
        } catch (ClientProtocolException e) {  
            System.out.println("postFile，不支援http協議"+ e);  
        } catch (IOException e) {  
            System.out.println("postFile資料傳輸失敗"+ e);  
        }  
        System.out.println(result);  
        return result;  
    }  

    public static void main(String[] args) {  
        String url = "https://api.weixin.qq.com/cgi-bin/material/add_material?access_token=6_svqJO4NtnZZg3Ah52v7-jM2GBykm9WMNsN5I3677tVCwyFDMxKudBXyh3wvoOAAxdVBBvmx1XF4fgXwc1epuVQgPgJGKc4wP-tzPKtdH8paKUWEOPBBfqbNpSo65vwAPK9BzatY6SK3F-n7uNESeABAQHV&type=image";  
        postFile(url, "/Users/jinx/Downloads/WechatIMG185.jpeg");  
    }  
}