基于JAVA的微信公众号开发【学习二】

遇到的坑：

40027 不合法的子菜单按钮URL长度

在这里，我明明把url与微信开发文档上换成一样的了，但是还是会爆这个错。。后来我发现是我转换的JSON格式中 URL是大写的字样，而开发文档上是小写的。
所以需要改自己定义的ViewButton类中用到的get set方法中属性名字。

同理，如果说遇到这类问题，确保自己URL或者KEY是合格的，那么肯定就是JSON的问题啦。

关于花生壳的使用

因为自从上次使用到现在，我发现花生壳新产生的域名后面会带上端口号！！！
而微信要正确连接到自己映射出的本地服务器的话，需要80端口。所以我觉得花生壳在这点上似乎不能用了QAQ。所以我又去用了ngrok。
https://ngrok.com 这是他们的官网。下载过后，再登录。按照首页教你的方法就可以操作啦~~~~

正式开始这次的总结

微信消息接收与发送

XML

将xml变成Map

public static Map<String,String> xmlToMap(HttpServletRequest request){        Map<String, String> map = new HashMap<String, String>();        SAXReader reader = new SAXReader();        InputStream inputStream;        try {            inputStream = request.getInputStream();            Document doc = reader.read(inputStream);            Element root = doc.getRootElement();            List<Element> list = root.elements();            getEliments(list, map);            inputStream.close();            return map;        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (DocumentException e1) {            // TODO Auto-generated catch block            e1.printStackTrace();        }        return null;    }private static void getEliments(List<Element> sonEliment, Map<String, String> map) {        for (Element element : sonEliment) {            if (element.elements().size() != 0) {                getEliments(element.elements(), map);            } else {                map.put(element.getName(),element.getText());            }        }    }

将对象变为XML
提前封装一个TextMessage的类

//其它6中消息参见开发文档    private String ToUserName;    private String FromUserName;    private String CreateTime;    private String MsgType;    private String Content;    private String MsgId;//。。。public String TextMessageToXML(TextMessage textMessage){        XStream xStream = new XStream();        xStream.alias("xml", textMessage.getClass());//根标签一定是xml        return xStream.toXML(textMessage);    }

JSON

 String menu = JSONObject.fromObject(InitMenu.initMenu()).toString(); //这里就只说将拼装的菜单转为json格式吧

菜单

菜单的种类不说了（详情参见文档）

请求方式

POST

public static JSONObject doPost(String url,String outStr){        CloseableHttpClient httpClient = HttpClients.createDefault();        HttpPost httpPost = new HttpPost(url);        JSONObject jsonObject = null;         try {            httpPost.setEntity(new StringEntity(outStr,"utf-8"));            CloseableHttpResponse response = httpClient.execute(httpPost);            HttpEntity entity = response.getEntity();            if(entity != null){                String result = EntityUtils.toString(entity,"UTF-8");                jsonObject =JSONObject.fromObject(result);            }        } catch (ClientProtocolException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        return jsonObject;    }

GET

public static JSONObject doGet(String url) {        CloseableHttpClient httpClient = HttpClients.createDefault();        HttpGet httpGet = new HttpGet(url);        JSONObject jsonObject = null;        try {            CloseableHttpResponse response = httpClient.execute(httpGet);            HttpEntity entity = response.getEntity();            if (entity != null) {                //entity 转为 String , String再转为JSONObject                String result = EntityUtils.toString(entity, "UTF-8");                jsonObject = JSONObject.fromObject(result);            }        } catch (ClientProtocolException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        return jsonObject;    }