微信公众号分享内容自定义，点击链接可获点击用户的openid

今日在开发微信公众平台，需要用到分享功能。

本来，如果公众号申请的东西都ok了之后，微信打开微信公众号之后是可以实现分享的，但是这个分享其实是微信默认的分享，它只分享网页上的title（title），第一张图片（imgUrl），网站域名（desc）和网址（link）。而我们用到的分享功能需要自己去定义这些参数。

一开始，完全懵逼，完全不知道是怎么一回事。心想，我们怎么能通过网页操作微信呢？因为分享是微信app自带的啊。后来，才明白，原来微信浏览器会解析网页中的参数，如果网页中没有设置的话，他会使用默认的方法。找到原理就知道如何做啦，上代码，步骤如下：

1.导入微信js sdk <script type="text/javaScript" src='<%=basePath%>javaScript/jweixin-1.0.0.js'></script>

2.<script language="javascript">

//分享-------start

var url=new URL('index.do?method=getWXSingn');//后台服务生成签名

var targetUrl = location.href.split('#')[0];

url.addPara('url',targetUrl);

var gjson = AjaxUtil.ajaxRequest(url.getURLString());//同步请求

//获取签名
wx.config({

debug: false,

appId: '',//申请的公众号id

timestamp: gjson.timestamp,

nonceStr: gjson.nonceStr,

signature: gjson.signature,

jsApiList: [//需要重写的功能列表

'onMenuShareTimeline',//朋友圈

'onMenuShareAppMessage',//朋友

'onMenuShareQQ',
'onMenuShareQZone',

'onMenuShareWeibo'
]

});

wx.ready(function () {

var shareData = {//自定义分享数据

title: '<%=productname%>',

desc: '<%=productname%>',

link: '<%=basePath%>oauth2servlet?&from_memberid=<%=memberid%>&productid=<%=productid%>',//链接地址

imgUrl: '<%=imgurl%>'

};

wx.onMenuShareAppMessage(shareData);
wx.onMenuShareTimeline(shareData);
wx.onMenuShareQQ(shareData);
wx.onMenuShareQZone(shareData);
wx.onMenuShareWeibo(shareData);
});

wx.error(function (res) {//错误处理

alert(res.errMsg);

});

----------------------------以上界面处理over------------------------------

----------------------------请求方法 ajaxRequest------------------------------

}

-----------下面的难点就是如何解析链接地址，并获取用户openid-------------

public class Oauth2Servlet extends HttpServlet {

//网页授权获取用户信息
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String from_memberid = request.getParameter("from_memberid");
System.out.println("doGet from_memberid="+from_memberid);
String appid = "";
String code=request.getParameter("code");
String productid=request.getParameter("productid");
// String backUri = "http://www.homeband.com.cn/communityWx/oauth2Servlet?from="+from+"&appid="+appid+"&productid="+productid;
String backUri="http://www.homeband.com.cn/communityWx/oauth2servlet?from_memberid="+from_memberid+"&productid="+productid;
if(null==code || "".equals(code)){
// String backUri = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+request.getContextPath()+"/"+"oauth2.jsp";
//URLEncoder.encode 后可以在backUri 的url里面获取传递的所有参数
backUri = URLEncoder.encode(backUri);
//scope 参数视各自需求而定，这里用scope=snsapi_base 不弹出授权页面直接授权目的只获取统一支付接口的openid
String url = "https://open.weixin.qq.com/connect/oauth2/authorize?" +
"appid=" + appid+
"&redirect_uri=" +
backUri+
"&response_type=code&scope=snsapi_userinfo&state=123#wechat_redirect";
System.out.println(url);
response.sendRedirect(url);
System.out.println("to get code ");
}else{
System.out.println("code ="+code);
//获取到code后获取token
String secret="";
String url="https://api.weixin.qq.com/sns/oauth2/access_token?appid="+appid+"&secret="+secret+"&code="+code+"&grant_type=authorization_code";
JSONObject jsonObject2 = CommonUtil.httpsRequest(url, "GET", null);
System.out.print("jsonObject2="+jsonObject2.toString());
String access_token=jsonObject2.getString("access_token");//网页授权接口
String openid=jsonObject2.getString("openid");
String refresh_token=jsonObject2.getString("refresh_token");

//根据oppenid获取用户id，如果注册过直接获取，如果没注册过重新注册（memberid,openid）
try {
String memberid=BackUtil.getMemberByOpenid(openid);
HttpSession session=request.getSession(true);
//设置Session值
session.setAttribute("memberid",memberid);

String detai_url="http://www.homeband.com.cn/communityWx/mall/shop/detail.jsp?productid="+productid+"&from_memberid="+from_memberid;
// System.out.println("detai_url="+detai_url);
response.sendRedirect(detai_url);
// request.setAttribute("productid", productid);
// request.setAttribute("from", from);
// request.getRequestDispatcher("/mall/shop/detail.jsp?footer_current=index").forward(request,response);
} catch (Exception e) {
e.printStackTrace();
}

/*if(access_token!=null && !"".equals(access_token)){//根据token获取微信用户信息，暂时不用

}*/
}

}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}

------------httpsRequest--------

public static JSONObject httpsRequest(String requestUrl, String requestMethod, String outputStr) {
JSONObject jsonObject = null;
try {
// 创建SSLContext对象，并使用我们指定的信任管理器初始化
TrustManager[] tm = { new MyX509TrustManager() };
SSLContext sslContext = SSLContext.getInstance("SSL", "SunJSSE");
sslContext.init(null, tm, new java.security.SecureRandom());
// 从上述SSLContext对象中得到SSLSocketFactory对象
SSLSocketFactory ssf = sslContext.getSocketFactory();

URL url = new URL(requestUrl);
HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
conn.setSSLSocketFactory(ssf);

conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
// 设置请求方式（GET/POST）
conn.setRequestMethod(requestMethod);

// 当outputStr不为null时向输出流写数据
if (null != outputStr) {
OutputStream outputStream = conn.getOutputStream();
// 注意编码格式
outputStream.write(outputStr.getBytes("UTF-8"));
outputStream.close();
}

// 从输入流读取返回内容
InputStream inputStream = conn.getInputStream();
InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String str = null;
StringBuffer buffer = new StringBuffer();
while ((str = bufferedReader.readLine()) != null) {
buffer.append(str);
}

// 释放资源
bufferedReader.close();
inputStreamReader.close();
inputStream.close();
inputStream = null;
conn.disconnect();
jsonObject = JSONObject.fromObject(buffer.toString());
} catch (ConnectException ce) {
} catch (Exception e) {
}
return jsonObject;
}

微信公众号分享内容自定义，点击链接可获点击用户的openid

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