微信公众平台开发

在微信服务平台的具体实现中，确实不是一帆风顺的。而且也是在我们公司中投入人员最少的一个项目。刚开始我甚至有些感觉孤立无援。因为，微信的功能测试需要真正发到客户的手机上才能看到效果，可是，由于公司没有提供满足条件的测试服务器，刚开始真的有些措手不及，无从下手。经过几天的资料收集，终于发现一个开源免费的平台——百度网络应用开发平台，虽然比较辛苦，但却很开心，因为终于可以把我们的微信服务平台部署到上面，进行调试和开发了。这是一个全新的旅程，充满挑战和难度。面临多重新技术的学习：

虽然腾讯提供了一些接口，但是还远远不能满足我们的业务需求。所以应用现有的技术，编写一些小的插件来实现接口没有提供的功能就显得势在必行。经过不断的努力和无数次的试验，终于实现了像下行微信消息、提取客户语音文件及图片信息、应用第三方API实现股票查询等这些腾讯接口没用提供的功能，还是得以实现。由于涉及的内容比较多，所以下面就对微信公众平台开发中的结合BAE进行IO操作的一些要点进行整理，主要是为了实现图文消息的上传，和用模拟登陆的方式下载客户发送给公众账号的语音消息、图片消息等。
在这里我写了一个工具类，内容如下：

package com.weinxin.utils;
import com.baidu.inf.iis.bcs.BaiduBCS;
import com.baidu.inf.iis.bcs.auth.BCSCredentials;
public class BaiduBCSTools {
public static String ACCESSKEY = "F0909c0717a319bb6e2**********";
public static String SECRETKEY = "84c09d2f43873b15c310**********";
public static String IMAGE_BUCKET = "myimage";// 图片容器
public static String VOICE_BUCKET = "hwnvoice";// 音频容器
public static String OTHER_BUCKET = "otherfile";// 其他类型的容器
public static String HOST = "bcs.duapp.com";
// 目录
public static String IMAGE_FOLDER = "/image/";
public static String VOICE_FOLDER = "/voice/";
public static String OTHER_FOLDER = "/other/";
/**
*
* 功能说明: 获取BaiduBCS对象
* @return BaiduBCS对象
*/
public static BaiduBCS getBaiduBCS(){
BCSCredentials credentials = new BCSCredentials(ACCESSKEY, SECRETKEY);
BaiduBCS baiduBCS = new BaiduBCS(credentials, HOST);
baiduBCS.setDefaultEncoding("UTF-8"); // Default UTF-8
return baiduBCS;
}
}

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基于此编写的，通过模拟登陆的方式获取微信附件的工具代码如下：

package com.weixin.utils;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import com.baidu.inf.iis.bcs.BaiduBCS;
import com.baidu.inf.iis.bcs.model.ObjectMetadata;
import com.baidu.inf.iis.bcs.request.PutObjectRequest;
import com.baidu.inf.iis.bcs.response.BaiduBCSResponse;
import com.weixin.modules.model.Message;
import com.weixin.utils.MD5;
public class DownLoadUtils {
public static final String LOGIN_URL = "http://mp.weixin.qq.com/cgi-bin/login?lang=zh_CN";
public static String DOWNLOAD_URL = "https://mp.weixin.qq.com/cgi-bin/downloadfile?msgid=#msgId&token=";
public static final String USERNAME = "******@163.com";
public static final String PASSWORD = "********";
/**
*
* 功能说明: 获取登陆微信公众平台后的cookie
* @return cookie字符串
* @throws Exception
*/
public static String getCookies() throws Exception {
URL url = new URL(LOGIN_URL);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoOutput(true);// 允许连接提交信息
connection.setRequestMethod("POST");// 网页提交方式“GET”、“POST”
connection.setRequestProperty("User-Agent",
"Mozilla/4.7 [en] (Win98; I)");
StringBuffer sb = new StringBuffer();
sb.append("username=" + USERNAME);
sb.append("&pwd=" + MD5.getMD5(PASSWORD.getBytes())
.toUpperCase());
OutputStream os = connection.getOutputStream();
os.write(sb.toString().getBytes());
os.close();
BufferedReader br = new BufferedReader(new InputStreamReader(
connection.getInputStream()));
String cookieVal = null;
String response_cookie = "";
String key=null;
for (int i = 1; (key = connection.getHeaderFieldKey(i)) != null; i++ ) {
if (key.equalsIgnoreCase("Set-Cookie")) {
cookieVal = connection.getHeaderField(i);
cookieVal = cookieVal.substring(0, cookieVal.indexOf(";"));
response_cookie = response_cookie + cookieVal + ";";
}
}
System.out.println("response_cookie==" + response_cookie);
String line = br.readLine();
while (line != null) {
// 获取token
if(line.contains("ErrMsg")){
DOWNLOAD_URL += line.substring(line.lastIndexOf("=") + 1, line.lastIndexOf("\""));
}
line = br.readLine();// 打出登录的网页
}
return response_cookie;
}
/**
*
* 功能说明: 下载指定消息ID的文件并保存到百度空间
* @param msgId 消息ID
* @param message 消息体
* @param fileType 文件类型
* @return 消息保存到百度空间后的名字
* @throws Exception
*/
public static String download(String msgId, Message message, String fileType) throws Exception{
String cookies = getCookies();
String file_name = null;
if("voice".equalsIgnoreCase(fileType)){
file_name = BaiduBCSTools.VOICE_FOLDER + msgId;
}else if("image".equalsIgnoreCase(fileType)){
file_name = BaiduBCSTools.IMAGE_FOLDER + msgId;
}else {
file_name = BaiduBCSTools.OTHER_FOLDER + msgId;
}
String url = DOWNLOAD_URL.replace("#msgId", msgId);
URL download_url = new URL(url);
HttpURLConnection download_conn = (HttpURLConnection) download_url
.openConnection();
download_conn.setRequestProperty("Cookie", cookies);// 设置服务器送登录后的cookie
ObjectMetadata metadata = new ObjectMetadata();
String type = download_conn.getContentType();
// 后缀名称
String suffix = type.substring(type.lastIndexOf("/") + 1);
file_name += "." + suffix;
System.out.println("type=" + type + ",suffix=" + suffix);
long length = download_conn.getContentLength();
if(message != null){
// message.setFileLength(length + "");
}
metadata.setContentType(type);
metadata.setContentLength(length);
PutObjectRequest request = null;
try {
InputStream in = download_conn.getInputStream();
BaiduBCS baiduBCS = BaiduBCSTools.getBaiduBCS();
String bucket = null;
if("voice".equalsIgnoreCase(fileType)){
bucket = BaiduBCSTools.VOICE_BUCKET;
}else if("image".equalsIgnoreCase(fileType)){
bucket = BaiduBCSTools.IMAGE_BUCKET;
}else {
bucket = BaiduBCSTools.OTHER_BUCKET;
}
request = new PutObjectRequest(bucket, file_name, in, metadata);
BaiduBCSResponse<ObjectMetadata> response = baiduBCS.putObject(request);
ObjectMetadata objectMetadata = response.getResult();
System.out.println("objectMetadata="+objectMetadata+",request-id="+response.getRequestId());
} catch (IOException e) {
e.printStackTrace();
}
return file_name;
}
public static void main(String[] args) {
String msgId = "5885899705870713317";
try {
String file_name = download(msgId, null, "image");
System.out.println("file_name==" + file_name);
} catch (Exception e) {
e.printStackTrace();
}
}
}

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微信公众平台开发

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