java实现上传网络图片到微信临时素材

package org.afuos.playcontrol.service;
 
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
 
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
 
/**
 * Created by Mohon on 2017/8/10.
 */
public class UploadPicToWx {
 
 /**
 * 网络图片上传到微信服务器
 *
 * @param urlPath 图片路径
 * @return JSONObject
 * @throws Exception
 */
 public String getMediaIdFromUrl(String urlPath, String fileType) throws Exception {
 String result = null;
 String url = "http://file.api.weixin.qq.com/cgi-bin/media/upload?access_token= Access_token &type=" + fileType + "";
 String fileName = urlPath.substring(urlPath.lastIndexOf("/") + 1);
 // 获取网络图片
 URL mediaUrl = new URL(urlPath);
 HttpURLConnection meidaConn = (HttpURLConnection) mediaUrl.openConnection();
 meidaConn.setDoOutput(true);
 meidaConn.setRequestMethod("GET");
 
 /**
  * 第一部分
  */
 URL urlObj = new URL(url);
 HttpURLConnection con = (HttpURLConnection) urlObj.openConnection();
 con.setRequestMethod("POST"); // 以Post方式提交表单，默认get方式
 con.setDoInput(true);
 con.setDoOutput(true);
 con.setUseCaches(false); // post方式不能使用缓存
 // 设置请求头信息
 con.setRequestProperty("Connection", "Keep-Alive");
 con.setRequestProperty("Charset", "UTF-8");
 // 设置边界
 String BOUNDARY = "----------" + System.currentTimeMillis();
 con.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY);
 // 请求正文信息
 // 第一部分：
 StringBuilder sb = new StringBuilder();
 sb.append("--"); // 必须多两道线
 sb.append(BOUNDARY);
 sb.append("\r\n");
 sb.append("Content-Disposition: form-data;name=\"media\";filename=\"" + fileName + "\"\r\n");
 sb.append("Content-Type:application/octet-stream\r\n\r\n");
 byte[] head = sb.toString().getBytes("utf-8");
 // 获得输出流
 OutputStream out = new DataOutputStream(con.getOutputStream());
 // 输出表头
 out.write(head);
 // 文件正文部分
 // 把文件已流文件的方式 推入到url中
 DataInputStream in = new DataInputStream(meidaConn.getInputStream());
 int bytes = 0;
 byte[] bufferOut = new byte[1024];
 while ((bytes = in.read(bufferOut)) != -1) {
  out.write(bufferOut, 0, bytes);
 }
 in.close();
 // 结尾部分
 byte[] foot = ("\r\n--" + BOUNDARY + "--\r\n").getBytes("utf-8");// 定义最后数据分隔线
 out.write(foot);
 out.flush();
 out.close();
 meidaConn.disconnect();
 StringBuffer buffer = new StringBuffer();
 BufferedReader reader = null;
 try {
  // 定义BufferedReader输入流来读取URL的响应
  reader = new BufferedReader(new InputStreamReader(con.getInputStream()));
  String line = null;
  while ((line = reader.readLine()) != null) {
  buffer.append(line);
  }
  if (result == null) {
  result = buffer.toString();
  }
 } catch (IOException e) {
  log.info("发送POST请求出现异常！ {}", e);
  e.printStackTrace();
  throw new IOException("数据读取异常");
 } finally {
  if (reader != null) {
  reader.close();
  }
 }
 JSONObject jsonObj = JSON.parseObject(result);
 log.info("getMediaId jsonObj: {}", jsonObj);
 return jsonObj.getString("media_id");
 }
}