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" );

  }

}