java微信开发之上传下载多媒体文件

回复图片、音频、视频消息都是需要media_id的，这个是需要将多媒体文件上传到微信服务器才有的。

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：=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 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
  
• @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,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,len);
}

bos.close();
in.close();
conn.disconnect();

return fileSavePath;
}
}

测试代码：

/**

• @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 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 fileSaveDir) {
  try {
  return WeixinUtil.downloadMediaFromWx(accessToken,fileSaveDir);
  } catch (IOException e) {
  e.printStackTrace();
  }

return null;
}
}

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