其實在weixin4j中,已經爲大家提供了一個默認的消息接入Filter,大家只需要將jar包引入,然後配置一下web.xml和weixin4j.properties,然後部署web項目,也可以實現新手接入。
首先先展示一下默認的Filter源碼
/*
* 微信公衆平臺(JAVA) SDK
*
* Copyright (c) 2014, Ansitech Network Technology Co.,Ltd All rights reserved.
*
* http://www.weixin4j.org/
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.weixin4j;
import org.weixin4j.util.TokenUtil;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletInputStream;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.weixin4j.spi.IMessageHandler;
import org.weixin4j.spi.HandlerFactory;
/**
* 微信公衆平臺接受消息默認攔截器
*
* @author yangqisheng
* @since 0.0.1
*/
public class WeixinUrlFilter implements Filter {
@Override
public void init(FilterConfig config) throws ServletException {
if (Configuration.isDebug()) {
System.out.println("WeixinUrlFilter啓動成功!");
}
}
@Override
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
//微信服務器將發送GET請求到填寫的URL上,這裏需要判定是否爲GET請求
boolean isGet = request.getMethod().toLowerCase().equals("get");
if (Configuration.isDebug()) {
System.out.println("獲得微信請求:" + request.getMethod() + " 方式");
System.out.println("微信請求URL:" + request.getServletPath());
}
//消息來源可靠性驗證
String signature = request.getParameter("signature");// 微信加密簽名
String timestamp = request.getParameter("timestamp");// 時間戳
String nonce = request.getParameter("nonce"); // 隨機數
//Token爲weixin4j.properties中配置的Token
String token = TokenUtil.get();
if (isGet) {
//1.驗證消息真實性
//http://mp.weixin.qq.com/wiki/index.php?title=驗證消息真實性
//URL爲http://www.weixin4j.org/api/公衆號
//成爲開發者驗證
String echostr = request.getParameter("echostr"); //
//確認此次GET請求來自微信服務器,原樣返回echostr參數內容,則接入生效,成爲開發者成功,否則接入失敗
if (TokenUtil.checkSignature(token, signature, timestamp, nonce)) {
response.getWriter().write(echostr);
}
} else {
//確認此次GET請求來自微信服務器,原樣返回echostr參數內容,則接入生效,成爲開發者成功,否則接入失敗
if (!TokenUtil.checkSignature(token, signature, timestamp, nonce)) {
//消息不可靠,直接返回
response.getWriter().write("");
return;
}
//用戶每次向公衆號發送消息、或者產生自定義菜單點擊事件時,響應URL將得到推送
doPost(request, response);
}
}
//當普通微信用戶向公衆賬號發消息時,微信服務器將POST消息的XML數據包到開發者填寫的URL上
//用戶在關注與取消關注公衆號時,微信會把這個事件推送到開發者填寫的URL
//用戶每次發送語音給公衆號時,微信會在推送的語音消息XML數據包中,增加一個Recongnition字段
private void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException {
try {
response.setCharacterEncoding("UTF-8");
response.setContentType("text/xml");
//獲取POST流
ServletInputStream in = request.getInputStream();
if (Configuration.isDebug()) {
System.out.println("接收到微信輸入流,準備處理...");
}
IMessageHandler messageHandler = HandlerFactory.getMessageHandler();
//處理輸入消息,返回結果
String xml = messageHandler.invoke(in);
//返回結果
response.getWriter().write(xml);
} catch (Exception ex) {
ex.printStackTrace();
response.getWriter().write("");
}
}
@Override
public void destroy() {
}
}
源碼大家可以看,也可以不看。
下面教大家,直接在web.xml中,加一個Filter即可。
<!-- 默認Filter方式 微信接入配置 -->
<servlet>
<servlet-name>wechatFilter</servlet-name>
<servlet-class>org.weixin4j.WeixinUrlFilter</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>wechatFilter</servlet-name>
<url-pattern>/api/*</url-pattern>
</servlet-mapping>
最後,將項目打包,發佈到服務器,就可以在微信公衆號平臺中,進行開發者接入認證了。
祝你部署成功,生活愉快!
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