java微信开发之上传下载多媒体文件

2024-03-16 12:59:02 276

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：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：

importjava.io.BufferedOutputStream;
importjava.io.BufferedReader;
importjava.io.DataInputStream;
importjava.io.DataOutputStream;
importjava.io.File;
importjava.io.FileInputStream;
importjava.io.FileOutputStream;
importjava.io.IOException;
importjava.io.InputStream;
importjava.io.InputStreamReader;
importjava.io.OutputStream;
importjava.net.HttpURLConnection;
importjava.net.MalformedURLException;
importjava.net.URL;
importjava.security.KeyManagementException;
importjava.security.NoSuchAlgorithmException;
importjava.security.NoSuchProviderException;
importjava.security.SecureRandom;
importjava.util.Calendar;
importjava.util.Date;
importjava.util.HashMap;
importjava.util.Map;

importjavax.net.ssl.HttpsURLConnection;
importjavax.net.ssl.SSLContext;
importjavax.net.ssl.SSLSocketFactory;
importjavax.net.ssl.TrustManager;

importnet.sf.json.JSONObject;

importorg.apache.commons.lang.StringUtils;
importorg.apache.log4j.Logger;

importcom.company.project.model.menu.AccessToken;
importcom.company.project.model.menu.Menu;

publicclassWeixinUtil{
privatestaticLoggerlog=Logger.getLogger(WeixinUtil.class);
publicfinalstaticStringAPPID="wxb927d4280e6db674";
publicfinalstaticStringAPP_SECRET="21441e9f3226eee81e14380a768b6d1e";
//获取access_token的接口地址（GET）限200（次/天）
publicfinalstaticStringaccess_token_url="https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET";
//创建菜单
publicfinalstaticStringcreate_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
publicfinalstaticMap<String,Object>accessTokenMap=newHashMap<String,Object>();
/**
*发起https请求并获取结果
*
*@paramrequestUrl请求地址
*@paramrequestMethod请求方式（GET、POST）
*@paramoutputStr提交的数据
*@returnJSONObject(通过JSONObject.get(key)的方式获取json对象的属性值)
*/
publicstaticJSONObjecthandleRequest(StringrequestUrl,StringrequestMethod,StringoutputStr){
JSONObjectjsonObject=null;

try{
URLurl=newURL(requestUrl);
HttpsURLConnectionconn=(HttpsURLConnection)url.openConnection();
SSLContextctx=SSLContext.getInstance("SSL","SunJSSE");
TrustManager[]tm={newMyX509TrustManager()};
ctx.init(null,tm,newSecureRandom());
SSLSocketFactorysf=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)){
OutputStreamout=conn.getOutputStream();
out.write(outputStr.getBytes("utf-8"));
out.close();
}

InputStreamin=conn.getInputStream();
BufferedReaderbr=newBufferedReader(newInputStreamReader(in,"utf-8"));
StringBufferbuffer=newStringBuffer();
Stringline=null;

while((line=br.readLine())!=null){
buffer.append(line);
}

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

jsonObject=JSONObject.fromObject(buffer.toString());
}catch(MalformedURLExceptione){
e.printStackTrace();
log.error("URL错误！");
}catch(IOExceptione){
e.printStackTrace();
}catch(NoSuchAlgorithmExceptione){
e.printStackTrace();
}catch(NoSuchProviderExceptione){
e.printStackTrace();
}catch(KeyManagementExceptione){
e.printStackTrace();
}
returnjsonObject;
}

/**
*获取access_token
*
*@authorqincd
*@dateNov6,20149:56:43AM
*/
publicstaticAccessTokengetAccessToken(Stringappid,StringappSecret){
AccessTokenat=newAccessToken();
//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()){
DategetTokenTime=(Date)accessTokenMap.get("getTokenTime");
Calendarc=Calendar.getInstance();
c.setTime(getTokenTime);
c.add(Calendar.HOUR_OF_DAY,2);

getTokenTime=c.getTime();
if(getTokenTime.after(newDate())){
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
Stringtoken=(String)accessTokenMap.get("token");
Integerexpire=(Integer)accessTokenMap.get("expire");
at.setToken(token);
at.setExpiresIn(expire);
returnat;
}
}
StringrequestUrl=access_token_url.replace("APPID",appid).replace("APPSECRET",appSecret);

JSONObjectobject=handleRequest(requestUrl,"GET",null);
Stringaccess_token=object.getString("access_token");
intexpires_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",newDate());
accessTokenMap.put("token",access_token);
accessTokenMap.put("expire",expires_in);

returnat;
}

/**
*创建菜单
*
*@authorqincd
*@dateNov6,20149:56:36AM
*/
publicstaticbooleancreateMenu(Menumenu,StringaccessToken){
StringrequestUrl=create_menu_url.replace("ACCESS_TOKEN",accessToken);
StringmenuJsonString=JSONObject.fromObject(menu).toString();
JSONObjectjsonObject=handleRequest(requestUrl,"POST",menuJsonString);
StringerrorCode=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")));
returnfalse;
}

log.info("菜单创建成功！");

returntrue;
}

//上传多媒体文件到微信服务器
publicstaticfinalStringupload_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>
*@seehttp://www.oschina.net/code/snippet_1029535_23824
*@seehttp://mp.weixin.qq.com/wiki/index.php?title=上传下载多媒体文件
*
*@authorqincd
*@dateNov6,20144:11:22PM
*/
publicstaticJSONObjectuploadMediaToWX(StringfilePath,Stringtype,StringaccessToken)throwsIOException{
Filefile=newFile(filePath);
if(!file.exists()){
log.error("文件不存在！");
returnnull;
}

Stringurl=upload_media_url.replace("ACCESS_TOKEN",accessToken).replace("TYPE",type);
URLurlObj=newURL(url);
HttpURLConnectionconn=(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
StringBOUNDARY="----------"+System.currentTimeMillis();
conn.setRequestProperty("Content-Type","multipart/form-data;boundary="
+BOUNDARY);

//请求正文信息

//第一部分：
StringBuildersb=newStringBuilder();
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
OutputStreamout=newDataOutputStream(conn.getOutputStream());
out.write(head);

//文件正文部分
DataInputStreamin=newDataInputStream(newFileInputStream(file));
intbytes=0;
byte[]bufferOut=newbyte[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
StringBufferbuffer=newStringBuffer();
BufferedReaderreader=newBufferedReader(newInputStreamReader(
conn.getInputStream()));
Stringline=null;
while((line=reader.readLine())!=null){
buffer.append(line);
}

reader.close();
conn.disconnect();

returnJSONObject.fromObject(buffer.toString());
}catch(Exceptione){
log.error("发送POST请求出现异常！"+e);
e.printStackTrace();
}
returnnull;
}

publicstaticfinalStringdownload_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
*
*@authorqincd
*@dateNov6,20144:32:12PM
*/
publicstaticStringdownloadMediaFromWx(StringaccessToken,StringmediaId,StringfileSavePath)throwsIOException{
if(StringUtils.isEmpty(accessToken)||StringUtils.isEmpty(mediaId))returnnull;

StringrequestUrl=download_media_url.replace("ACCESS_TOKEN",accessToken).replace("MEDIA_ID",mediaId);
URLurl=newURL(requestUrl);
HttpURLConnectionconn=(HttpURLConnection)url.openConnection();
conn.setRequestMethod("GET");
conn.setDoInput(true);
conn.setDoOutput(true);
InputStreamin=conn.getInputStream();

Filedir=newFile(fileSavePath);
if(!dir.exists()){
dir.mkdirs();
}
if(!fileSavePath.endsWith("/")){
fileSavePath+="/";
}

StringContentDisposition=conn.getHeaderField("Content-disposition");
StringweixinServerFileName=ContentDisposition.substring(ContentDisposition.indexOf("filename")+10,ContentDisposition.length()-1);
fileSavePath+=weixinServerFileName;
BufferedOutputStreambos=newBufferedOutputStream(newFileOutputStream(fileSavePath));
byte[]data=newbyte[1024];
intlen=-1;

while((len=in.read(data))!=-1){
bos.write(data,0,len);
}

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

returnfileSavePath;
}
}

测试代码：

publicclassWeixinUtilTest{

/**
*
*@authorqincd
*@dateNov6,20149:57:54AM
*/
publicstaticvoidmain(String[]args){
//1).获取access_token
AccessTokenaccessToken=WeixinUtil.getAccessToken(WeixinUtil.APPID,WeixinUtil.APP_SECRET);
StringfilePath="C:\\Users\\qince\\Pictures\\壁纸20141029091612.jpg";
JSONObjectuploadJsonObj=testUploadMedia(filePath,"image",accessToken.getToken());
if(uploadJsonObj==null){
System.out.println("上传图片失败");
return;
}

interrcode=0;
if(uploadJsonObj.containsKey("errcode")){
errcode=uploadJsonObj.getInt("errcode");
}
if(errcode==0){
System.out.println("图片上传成功");

StringmediaId=uploadJsonObj.getString("media_id");
longcreateAt=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！");

Stringerrmsg=uploadJsonObj.getString("errmsg");
System.out.println("--Details:");
System.out.println("errcode:"+errcode);
System.out.println("errmsg:"+errmsg);
}

StringmediaId="6W-UvSrQ2hkdSdVQJJXShwtFDPLfbGI1qnbNFy8weZyb9Jac2xxxcAUwt8p4sYPH";
Stringfilepath=testDownloadMedia(accessToken.getToken(),mediaId,"d:/test");
System.out.println(filepath);
}


/**
*上传多媒体文件到微信
*
*@authorqincd
*@dateNov6,20144:15:14PM
*/
publicstaticJSONObjecttestUploadMedia(StringfilePath,Stringtype,StringaccessToken){
try{
returnWeixinUtil.uploadMediaToWX(filePath,type,accessToken);
}catch(IOExceptione){
e.printStackTrace();
}

returnnull;
}

/**
*从微信下载多媒体文件
*
*@authorqincd
*@dateNov6,20144:56:25PM
*/
publicstaticStringtestDownloadMedia(StringaccessToken,StringmediaId,StringfileSaveDir){
try{
returnWeixinUtil.downloadMediaFromWx(accessToken,mediaId,fileSaveDir);
}catch(IOExceptione){
e.printStackTrace();
}

returnnull;
}
}

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java微信开发之上传下载多媒体文件

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