微信文本消息处理

最新推荐文章于 2021-09-28 19:57:08 发布

北冥友余

最新推荐文章于 2021-09-28 19:57:08 发布

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本文链接：https://blog.youkuaiyun.com/Edison_03/article/details/73743379

本文介绍了一个基于Java的微信接入示例，包括如何验证微信服务器的请求、处理文本消息及响应。通过具体代码展示了核心业务逻辑和服务配置。

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（1）目录结构如图：

（2）核心业务逻辑类

package com.zk.service;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.dom4j.DocumentException;

import com.zk.entity.TextMessage;
import com.zk.util.messageUtil;
import com.zk.util.signUtil;

public class coreService extends HttpServlet{
	
	private static final long serialVersionUID = 1L;

	/**
	 * 验证是否是微信客户端发来的请求
	 */
	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		// TODO Auto-generated method stub
		String signature = req.getParameter("signature");
		String timestamp = req.getParameter("timestamp");
		String nonce = req.getParameter("nonce");
		String echostr = req.getParameter("echostr");
		
		//开发者通过检验signature对请求进行校验（下面有校验方式）。
		//若确认此次GET请求来自微信服务器，请原样返回echostr参数内容，则接入生效，
		//成为开发者成功，否则接入失败
		PrintWriter out = resp.getWriter();
		System.out.println("signature:"+signature+",timestamp:"+timestamp+",nonce:"+nonce+",echostr:"+echostr);
		if (signUtil.checkSignatrue(signature,timestamp,nonce)) {
			System.out.println(2);//不能被執行
			out.print(echostr);
			System.out.println(3);
		}
		System.out.println(4);
		out.close();
		out=null;
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		// TODO Auto-generated method stub
		req.setCharacterEncoding("utf-8");
		resp.setCharacterEncoding("utf-8");
		System.out.println("現在執行的是doPost請求");
		PrintWriter out = resp.getWriter();
		try {
			Map<String, String> map	 = messageUtil.xmlToMap(req);
			String fromUserName = map.get("ToUserName");
			String toUserName = map.get("FromUserName");
			String msgType = map.get("MsgType");
			String content =map.get("Content");
			String messgae = null;
			if ("text".equals(msgType)) {
				TextMessage text = new TextMessage();
				text.setFromUserName(fromUserName);
				text.setToUserName(toUserName);
				text.setMsgType("text");
				text.setCreateTime(new Date().getTime());
				text.setContent("你發送的消息是："+content);
				messgae = messageUtil.textMessageToXml(text);
				System.out.println(messgae);
			}
			out.print(messgae);
		} catch (DocumentException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} finally {
			out.close();
		}
		
	}
	
}

（2）工具类

1.校验签名工具类

package com.zk.util;

import java.security.MessageDigest;
import java.util.Arrays;

public class signUtil {

	public static final String token = "imooc";

	public static boolean checkSignatrue(String signature, String timestamp, String nonce) {
		// 1）将token、timestamp、nonce三个参数进行字典序排序
		String[] strings = new String[] { token, timestamp, nonce };
		Arrays.sort(strings);
		// 2）将三个参数字符串拼接成一个字符串进行sha1加密
		StringBuffer sb = new StringBuffer();
		for (int i = 0; i < strings.length; i++) {
			sb.append(strings[i]);
		}
		// 3）开发者获得加密后的字符串可与signature对比，标识该请求来源于微信
		String tmpStr = getSha1(sb.toString());
		return tmpStr.equals(signature);
	}

	// Sha1签名
	public static String getSha1(String str) {
		if (str == null || str.length() == 0) {
			return null;
		}
		char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
		try {
			MessageDigest mdTemp = MessageDigest.getInstance("SHA1");
			mdTemp.update(str.getBytes("UTF-8"));

			byte[] md = mdTemp.digest();
			int j = md.length;
			char buf[] = new char[j * 2];
			int k = 0;
			for (int i = 0; i < j; i++) {
				byte byte0 = md[i];
				buf[k++] = hexDigits[byte0 >>> 4 & 0xf];
				buf[k++] = hexDigits[byte0 & 0xf];
			}
			return new String(buf);
		} catch (Exception e) {
			return null;
		}
	}
}

2.文本消息工具类

package com.zk.util;

import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

import com.thoughtworks.xstream.XStream;
import com.zk.entity.TextMessage;


public class messageUtil {
	/**
	 * xml转为map集合
	 * @param req
	 * @return
	 * @throws IOException
	 * @throws DocumentException
	 */
	public static Map<String, String> xmlToMap(HttpServletRequest req) throws IOException, DocumentException{
		Map<String, String> map	 = new HashMap<String, String>();
		SAXReader reader = new SAXReader();
		InputStream ins = req.getInputStream();
		Document doc = reader.read(ins);
		Element root = doc.getRootElement();
		List<Element> list = root.elements();
		for (Element element : list) {
			map.put(element.getName(), element.getText());
		}
		ins.close();
		return map;
	}
	/**
	 * 消息對象轉化為xml
	 * @param textMessage
	 * @return
	 */
	public static String textMessageToXml(TextMessage textMessage){
		XStream xStream = new XStream();
		xStream.alias("xml",textMessage.getClass());
		return xStream.toXML(textMessage);
	}
}

（3）实体类

package com.zk.entity;

public class TextMessage {
	
	private String ToUserName;
	
	private String FromUserName;
	
	private long CreateTime;
	
	public long getCreateTime() {
		return CreateTime;
	}

	public void setCreateTime(long createTime) {
		CreateTime = createTime;
	}

	private String MsgType;
	
	private String Content;
	
	private String MsgId;

	public String getToUserName() {
		return ToUserName;
	}

	public void setToUserName(String toUserName) {
		ToUserName = toUserName;
	}

	public String getFromUserName() {
		return FromUserName;
	}

	public void setFromUserName(String fromUserName) {
		FromUserName = fromUserName;
	}


	public String getMsgType() {
		return MsgType;
	}

	public void setMsgType(String msgType) {
		MsgType = msgType;
	}

	public String getContent() {
		return Content;
	}

	public void setContent(String content) {
		Content = content;
	}

	public String getMsgId() {
		return MsgId;
	}

	public void setMsgId(String msgId) {
		MsgId = msgId;
	}
	
}

（4）web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <display-name>Archetype Created Web Application</display-name>
  <welcome-file-list>
  	<welcome-file>
  		index.jsp
  	</welcome-file>
  </welcome-file-list>
  <servlet>
  	<servlet-name>WeiXinServlet</servlet-name>
  	<servlet-class>com.zk.service.coreService</servlet-class>
  </servlet>
  <servlet-mapping>
  	<servlet-name>WeiXinServlet</servlet-name>
  	<url-pattern>*.do</url-pattern>
  </servlet-mapping>
</web-app>

（5）pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.zk</groupId>
	<artifactId>WeiXin</artifactId>
	<packaging>war</packaging>
	<version>0.0.1-SNAPSHOT</version>
	<name>WeiXin Maven Webapp</name>
	<url>http://maven.apache.org</url>
	<dependencies>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>3.8.1</version>
			<scope>test</scope>
		</dependency>
		<!-- https://mvnrepository.com/artifact/dom4j/dom4j -->
		<dependency>
			<groupId>dom4j</groupId>
			<artifactId>dom4j</artifactId>
			<version>1.6.1</version>
		</dependency>
		<!-- https://mvnrepository.com/artifact/com.thoughtworks.xstream/xstream -->
		<dependency>
			<groupId>com.thoughtworks.xstream</groupId>
			<artifactId>xstream</artifactId>
			<version>1.4.9</version>
		</dependency>
	</dependencies>
	<build>
		<finalName>WeiXin</finalName>
		<plugins>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>2.1</version>
				<configuration>
					<source>1.8</source>
					<target>1.8</target>
				</configuration>
			</plugin>
		</plugins>
	</build>
</project>

(6）结果展示