公众号上传临时素材获取media_id

公众号上传临时素材获取media_id

public class Util{
private static final String UPLOAD_URL = "https://api.weixin.qq.com/cgi-bin/media/upload?access_token=ACCESS_TOKEN&type=TYPE";
public static String uploadFile(String filePath, String accessToken, String type) throws Exception{
File file = new File(filePath);
if(!file.exists() || !file.isFile()) {
throw new IOException("文件不存在！");
}

String url = UPLOAD_URL.replace("ACCESS_TOKEN", accessToken).replace("TYPE", type);
URL urlObj = new URL(url);

//连接
HttpURLConnection conn = (HttpURLConnection) urlObj.openConnection();

conn.setRequestMethod("POST");
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setUseCaches(false);

//请求头
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("Charset", "UTF-8");
//conn.setRequestProperty("Content-Type","multipart/form-data;");

//设置边界
String BOUNDARY = "----------" + System.currentTimeMillis();
conn.setRequestProperty("Content-Type","multipart/form-data;boundary="+BOUNDARY);

StringBuilder sb = new StringBuilder();
sb.append("--");
sb.append(BOUNDARY);
sb.append("\r\n");
sb.append("Content-Disposition:form-data;name=\"file\";filename=\""+file.getName()+"\"\r\n");
sb.append("Content-Type:application/octet-stream\r\n\r\n");

byte[] head = sb.toString().getBytes("utf-8");

//输出流
OutputStream out = new DataOutputStream(conn.getOutputStream());

out.write(head);

//文件正文部分
DataInputStream in = new DataInputStream(new FileInputStream(file));
int bytes = 0;
byte[] bufferOut = new byte[1024];
while((bytes = in.read(bufferOut))!=-1) {
out.write(bufferOut,0,bytes);
}
in.close();

//结尾
byte[] foot = ("\r\n--" + BOUNDARY + "--\r\n").getBytes("utf-8");
out.write(foot);
out.flush();
out.close();

//获取响应
StringBuffer buffer = new StringBuffer();
BufferedReader reader = null;
String result = null;

reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String line = null;
while((line = reader.readLine()) != null) {
buffer.append(line);
}
if(result == null) {
result = buffer.toString();
}
reader.close();

//需要添加json-lib  jar包
JSONObject json = JSONObject.fromObject(result);
System.out.println(json);
String mediaId = json.getString("media_id");

return mediaId;
}
}