java实现上传网络图片到微信临时素材

本文实例为大家分享了java实现上传网络图片到微信临时素材的具体代码，供大家参考，具体内容如下

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");
}
}

来源：UploadPicToWx.java

来源：https://blog.csdn.net/rentian1/article/details/81104190