java微信开发之上传下载多媒体文件

将多媒体文件上传到微信服务器，以及从微信服务器下载文件，可以参考：http://mp.weixin.qq.com/wiki/index.php?title=上传下载多媒体文件

上传下载多媒体文件的方法还是写到WeixinUtil.java中。

代码如下：

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"; // 获取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"; // 创建菜单 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：获取token的时间,3.过期时间 public final static Map<String,Object> accessTokenMap = new HashMap<String,Object>(); /** * 发起https请求并获取结果 *  * @param requestUrl 请求地址 * @param requestMethod 请求方式（GET、POST） * @param outputStr 提交的数据 * @return JSONObject(通过JSONObject.get(key)的方式获取json对象的属性值) */ 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错误！"); } catch (IOException e) {  e.printStackTrace(); } catch (NoSuchAlgorithmException e) {  e.printStackTrace(); } catch (NoSuchProviderException e) {  e.printStackTrace(); } catch (KeyManagementException e) {  e.printStackTrace(); } return jsonObject; }   /** * 获取access_token * * @author qincd * @date Nov 6, 2014 9:56:43 AM */ public static AccessToken getAccessToken(String appid,String appSecret) { AccessToken at = new AccessToken(); // 每次获取access_token时，先从accessTokenMap获取，如果过期了就重新从微信获取 // 没有过期直接返回 // 从微信获取的token的有效期为2个小时 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("缓存中发现token未过期，直接从缓存中获取access_token");  // token未过期，直接从缓存获取返回  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);   // 每次获取access_token后，存入accessTokenMap // 下次获取时，如果没有过期直接从accessTokenMap取。 accessTokenMap.put("getTokenTime", new Date()); accessTokenMap.put("token", access_token); accessTokenMap.put("expire", expires_in);   return at; }   /** * 创建菜单 * * @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("菜单创建失败！errorCode:%d,errorMsg:%s",jsonObject.getInt("errcode"),jsonObject.getString("errmsg")));  return false; }   log.info("菜单创建成功！");   return true; }   // 上传多媒体文件到微信服务器 public static final String upload_media_url = "http://file.api.weixin.qq.com/cgi-bin/media/upload?access_token=ACCESS_TOKEN&type=TYPE"; /** * 上传多媒体文件到微信服务器<br> * @see http://www.oschina.net/code/snippet_1029535_23824 * @see http://mp.weixin.qq.com/wiki/index.php?title=上传下载多媒体文件 * * @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");      // 设置边界    String BOUNDARY = "----------" + System.currentTimeMillis();    conn.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=/"file/";filename=/""        + file.getName() + "/"/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(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();      /**     * 读取服务器响应，必须读取,否则提交不成功     */     try {     // 定义BufferedReader输入流来读取URL的响应     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("发送POST请求出现异常！" + 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"; /** * 从微信服务器下载多媒体文件 * * @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; }}

测试代码：

public class WeixinUtilTest {  /** * * @author qincd * @date Nov 6, 2014 9:57:54 AM */ public static void main(String[] args) { // 1).获取access_token AccessToken accessToken = WeixinUtil.getAccessToken(WeixinUtil.APPID, WeixinUtil.APP_SECRET); String filePath = "C://Users//qince//Pictures//壁纸20141029091612.jpg"; JSONObject uploadJsonObj = testUploadMedia(filePath,"image",accessToken.getToken()); if (uploadJsonObj == null) {  System.out.println("上传图片失败");  return; }   int errcode = 0; if (uploadJsonObj.containsKey("errcode")) {  errcode = uploadJsonObj.getInt("errcode"); } if (errcode == 0) {  System.out.println("图片上传成功");     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("图片上传失败！");     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); }   /** * 上传多媒体文件到微信 * * @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; }   /** * 从微信下载多媒体文件 * * @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java微信开发之上传下载多媒体文件的详细内容，更多请关注php中文网其它相关文章！