回復圖片、音頻、視頻消息都是需要media_id的，這個是需要將多媒體文件上傳到微信服務(wù)器才有的。
將多媒體文件上傳到微信服務(wù)器，以及從微信服務(wù)器下載文件，可以參考：http://mp.weixin.qq.com/wiki/index.php?title=上傳下載多媒體文件
上傳下載多媒體文件的方法還是寫到WeixinUtil.java中。
代碼如下：
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import java.io.BufferedOutputStream;import java.io.BufferedReader;import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.security.KeyManagementException;import java.security.NoSuchAlgorithmException;import java.security.NoSuchProviderException;import java.security.SecureRandom;import java.util.Calendar;import java.util.Date;import java.util.HashMap;import java.util.Map;import javax.net.ssl.HttpsURLConnection;import javax.net.ssl.SSLContext;import javax.net.ssl.SSLSocketFactory;import javax.net.ssl.TrustManager;import net.sf.json.JSONObject;import org.apache.commons.lang.StringUtils;import org.apache.log4j.Logger;import com.company.project.model.menu.AccessToken;import com.company.project.model.menu.Menu;public class WeixinUtil { private static Logger log = Logger.getLogger(WeixinUtil.class); public final static String APPID = "wxb927d4280e6db674"; public final static String APP_SECRET = "21441e9f3226eee81e14380a768b6d1e"; // 獲取access_token的接口地址（GET） 限200（次/天） public final static String access_token_url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET"; // 創(chuàng)建菜單 public final static String create_menu_url = "https://api.weixin.qq.com/cgi-bin/menu/create?access_token=ACCESS_TOKEN"; // 存放：1.token，2：獲取token的時間,3.過期時間 public final static Map<String,Object> accessTokenMap = new HashMap<String,Object>(); /** * 發(fā)起https請求并獲取結(jié)果 * * @param requestUrl 請求地址 * @param requestMethod 請求方式（GET、POST） * @param outputStr 提交的數(shù)據(jù) * @return JSONObject(通過JSONObject.get(key)的方式獲取json對象的屬性值) */ public static JSONObject handleRequest(String requestUrl,String requestMethod,String outputStr) { JSONObject jsonObject = null; try { URL url = new URL(requestUrl); HttpsURLConnection conn = (HttpsURLConnection) url.openConnection(); SSLContext ctx = SSLContext.getInstance("SSL", "SunJSSE"); TrustManager[] tm = {new MyX509TrustManager()}; ctx.init(null, tm, new SecureRandom()); SSLSocketFactory sf = ctx.getSocketFactory(); conn.setSSLSocketFactory(sf); conn.setDoInput(true); conn.setDoOutput(true); conn.setRequestMethod(requestMethod); conn.setUseCaches(false); if ("GET".equalsIgnoreCase(requestMethod)) { conn.connect(); } if (StringUtils.isNotEmpty(outputStr)) { OutputStream out = conn.getOutputStream(); out.write(outputStr.getBytes("utf-8")); out.close(); } InputStream in = conn.getInputStream(); BufferedReader br = new BufferedReader(new InputStreamReader(in,"utf-8")); StringBuffer buffer = new StringBuffer(); String line = null; while ((line = br.readLine()) != null) { buffer.append(line); } in.close(); conn.disconnect(); jsonObject = JSONObject.fromObject(buffer.toString()); } catch (MalformedURLException e) { e.printStackTrace(); log.error("URL錯誤！"); } catch (IOException e) { e.printStackTrace(); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } catch (NoSuchProviderException e) { e.printStackTrace(); } catch (KeyManagementException e) { e.printStackTrace(); } return jsonObject; } /** * 獲取access_token * * @author qincd * @date Nov 6, 2014 9:56:43 AM */ public static AccessToken getAccessToken(String appid,String appSecret) { AccessToken at = new AccessToken(); // 每次獲取access_token時，先從accessTokenMap獲取，如果過期了就重新從微信獲取 // 沒有過期直接返回 // 從微信獲取的token的有效期為2個小時 if (!accessTokenMap.isEmpty()) { Date getTokenTime = (Date) accessTokenMap.get("getTokenTime"); Calendar c = Calendar.getInstance(); c.setTime(getTokenTime); c.add(Calendar.HOUR_OF_DAY, 2); getTokenTime = c.getTime(); if (getTokenTime.after(new Date())) { log.info("緩存中發(fā)現(xiàn)token未過期，直接從緩存中獲取access_token"); // token未過期，直接從緩存獲取返回 String token = (String) accessTokenMap.get("token"); Integer expire = (Integer) accessTokenMap.get("expire"); at.setToken(token); at.setExpiresIn(expire); return at; } } String requestUrl = access_token_url.replace("APPID", appid).replace("APPSECRET", appSecret); JSONObject object = handleRequest(requestUrl, "GET", null); String access_token = object.getString("access_token"); int expires_in = object.getInt("expires_in"); log.info("\naccess_token:" + access_token); log.info("\nexpires_in:" + expires_in); at.setToken(access_token); at.setExpiresIn(expires_in); // 每次獲取access_token后，存入accessTokenMap // 下次獲取時，如果沒有過期直接從accessTokenMap取。 accessTokenMap.put("getTokenTime", new Date()); accessTokenMap.put("token", access_token); accessTokenMap.put("expire", expires_in); return at; } /** * 創(chuàng)建菜單 * * @author qincd * @date Nov 6, 2014 9:56:36 AM */ public static boolean createMenu(Menu menu,String accessToken) { String requestUrl = create_menu_url.replace("ACCESS_TOKEN", accessToken); String menuJsonString = JSONObject.fromObject(menu).toString(); JSONObject jsonObject = handleRequest(requestUrl, "POST", menuJsonString); String errorCode = jsonObject.getString("errcode"); if (!"0".equals(errorCode)) { log.error(String.format("菜單創(chuàng)建失敗！errorCode:%d,errorMsg:%s",jsonObject.getInt("errcode"),jsonObject.getString("errmsg"))); return false; } log.info("菜單創(chuàng)建成功！"); return true; } // 上傳多媒體文件到微信服務(wù)器 public static final String upload_media_url = "http://file.api.weixin.qq.com/cgi-bin/media/upload?access_token=ACCESS_TOKEN&type=TYPE"; /** * 上傳多媒體文件到微信服務(wù)器<br> * @see http://www.oschina.net/code/snippet_1029535_23824 * @see http://mp.weixin.qq.com/wiki/index.php?title=上傳下載多媒體文件 * * @author qincd * @date Nov 6, 2014 4:11:22 PM */ public static JSONObject uploadMediaToWX(String filePath,String type,String accessToken) throws IOException{ File file = new File(filePath); if (!file.exists()) { log.error("文件不存在！"); return null; } String url = upload_media_url.replace("ACCESS_TOKEN", accessToken).replace("TYPE", type); URL urlObj = new URL(url); HttpURLConnection conn = (HttpURLConnection) urlObj.openConnection(); conn.setDoInput(true); conn.setDoOutput(true); conn.setUseCaches(false); conn.setRequestProperty("Connection", "Keep-Alive"); conn.setRequestProperty("Charset", "UTF-8"); // 設(shè)置邊界 String BOUNDARY = "----------" + System.currentTimeMillis(); conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY); // 請求正文信息 // 第一部分： StringBuilder sb = new StringBuilder(); sb.append("--"); // ////////必須多兩道線 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"); // 獲得輸出流 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(); // 結(jié)尾部分 byte[] foot = ("\r\n--" + BOUNDARY + "--\r\n").getBytes("utf-8");// 定義最后數(shù)據(jù)分隔線 out.write(foot); out.flush(); out.close(); /** * 讀取服務(wù)器響應，必須讀取,否則提交不成功 */ try { // 定義BufferedReader輸入流來讀取URL的響應 StringBuffer buffer = new StringBuffer(); BufferedReader reader = new BufferedReader(new InputStreamReader( conn.getInputStream())); String line = null; while ((line = reader.readLine()) != null) { buffer.append(line); } reader.close(); conn.disconnect(); return JSONObject.fromObject(buffer.toString()); } catch (Exception e) { log.error("發(fā)送POST請求出現(xiàn)異常！" + e); e.printStackTrace(); } return null; } public static final String download_media_url = "http://file.api.weixin.qq.com/cgi-bin/media/get?access_token=ACCESS_TOKEN&media_id=MEDIA_ID"; /** * 從微信服務(wù)器下載多媒體文件 * * @author qincd * @date Nov 6, 2014 4:32:12 PM */ public static String downloadMediaFromWx(String accessToken,String mediaId,String fileSavePath) throws IOException { if (StringUtils.isEmpty(accessToken) || StringUtils.isEmpty(mediaId)) return null; String requestUrl = download_media_url.replace("ACCESS_TOKEN", accessToken).replace("MEDIA_ID", mediaId); URL url = new URL(requestUrl); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setRequestMethod("GET"); conn.setDoInput(true); conn.setDoOutput(true); InputStream in = conn.getInputStream(); File dir = new File(fileSavePath); if (!dir.exists()) { dir.mkdirs(); } if (!fileSavePath.endsWith("/")) { fileSavePath += "/"; } String ContentDisposition = conn.getHeaderField("Content-disposition"); String weixinServerFileName = ContentDisposition.substring(ContentDisposition.indexOf("filename")+10, ContentDisposition.length() -1); fileSavePath += weixinServerFileName; BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(fileSavePath)); byte[] data = new byte[1024]; int len = -1; while ((len = in.read(data)) != -1) { bos.write(data,0,len); } bos.close(); in.close(); conn.disconnect(); return fileSavePath; }} |
測試代碼：
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public class WeixinUtilTest { /** * * @author qincd * @date Nov 6, 2014 9:57:54 AM */ public static void main(String[] args) { // 1).獲取access_token AccessToken accessToken = WeixinUtil.getAccessToken(WeixinUtil.APPID, WeixinUtil.APP_SECRET); String filePath = "C:\\Users\\qince\\Pictures\\壁紙20141029091612.jpg"; JSONObject uploadJsonObj = testUploadMedia(filePath,"image",accessToken.getToken()); if (uploadJsonObj == null) { System.out.println("上傳圖片失敗"); return; } int errcode = 0; if (uploadJsonObj.containsKey("errcode")) { errcode = uploadJsonObj.getInt("errcode"); } if (errcode == 0) { System.out.println("圖片上傳成功"); String mediaId = uploadJsonObj.getString("media_id"); long createAt = uploadJsonObj.getLong("created_at"); System.out.println("--Details:"); System.out.println("media_id:" + mediaId); System.out.println("created_at:" + createAt); } else { System.out.println("圖片上傳失敗！"); String errmsg = uploadJsonObj.getString("errmsg"); System.out.println("--Details:"); System.out.println("errcode:" + errcode); System.out.println("errmsg:" + errmsg); } String mediaId = "6W-UvSrQ2hkdSdVQJJXShwtFDPLfbGI1qnbNFy8weZyb9Jac2xxxcAUwt8p4sYPH"; String filepath = testDownloadMedia(accessToken.getToken(), mediaId, "d:/test"); System.out.println(filepath); } /** * 上傳多媒體文件到微信 * * @author qincd * @date Nov 6, 2014 4:15:14 PM */ public static JSONObject testUploadMedia(String filePath,String type,String accessToken) { try { return WeixinUtil.uploadMediaToWX(filePath, type, accessToken); } catch (IOException e) { e.printStackTrace(); } return null; } /** * 從微信下載多媒體文件 * * @author qincd * @date Nov 6, 2014 4:56:25 PM */ public static String testDownloadMedia(String accessToken,String mediaId,String fileSaveDir) { try { return WeixinUtil.downloadMediaFromWx(accessToken, mediaId, fileSaveDir); } catch (IOException e) { e.printStackTrace(); } return null; }} |
以上就是本文的全部內(nèi)容，希望對大家的學習有所幫助，也希望大家多多支持服務(wù)器之家。
