准备工作
你要有一个微信公众号，一个内网穿透工具

相关网站
微信公众号：https://mp.weixin.qq.com/
官网文档：https://developers.weixin.qq.com/doc/offiaccount/Basic_Information/Access_Overview.html
需要资料
服务器配置：设置与开发-->基本配置-->服务器配置
token：3-32字符，自己生成配置到服务器配置
公网 IP：云服务器一般都有公网IP
内网穿透工具：本地测试需要穿透，否则无法对接。花生壳、natapp 等自行百度
注意事项
1.请求URL超时，说明内网穿透有问题
2.微信验证消息和推送消息事件接口是同一地址，验证消息是GET请求 ，事件推送消息是POST。
3.验证成功接口需要给微信原样返回随机字符串（echostr）内容，否则配置失败
4.响应类型(Content-Type) 一定要是 text/plan
5.切记自己对接的系统要是有权鉴，一定要放行微信消息验证接口
代码示例
消息验证

public void pushGet(HttpServletRequest request, HttpServletResponse response) {
    String signature = request.getParameter("signature"); // 签名
    String echostr = request.getParameter("echostr"); // 随机字符串
    String timestamp = request.getParameter("timestamp"); // 时间戳
    String nonce = request.getParameter("nonce"); // 随机数
    log.debug("signature:{}", signature);
    log.debug("echostr:{}", echostr);
    log.debug("timestamp:{}", timestamp);
    log.debug("nonce:{}", nonce);
    System.out.println("signature:" + signature);
    String sha1 = getSHA1(token, timestamp, nonce);
    System.out.println("sha1:" + sha1);
    if (sha1.equals(signature)) {
        log.debug("成功");
        this.responseText(echostr, response);
    }
}

事件推送

public void pushPost(HttpServletRequest request, HttpServletResponse response) {
    String signature = request.getParameter("signature"); // 签名
    String timestamp = request.getParameter("timestamp"); // 时间戳
    String nonce = request.getParameter("nonce"); // 随机数
    String sha1 = getSHA1(token, timestamp, nonce);
    if (sha1.equals(signature)) {
        Map<String, Object> map = null;
        try {
            map = XmlUtil.parseXMLToMap(request.getInputStream());
        } catch (IOException e) {
            e.printStackTrace();
        }
        log.debug("事件消息体:{}", map);
 
        this.responseText("", response); // 回复空串，微信服务器不会对此作任何处理
    }
 
}

完整代码

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.*;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.security.MessageDigest;
import java.util.*;
 
/**
 * @description: 微信配置
 * @堆代码 duidaima.com
2023-05-26
 **/
@Api(tags = "微信配置")
@Slf4j
@RestController
@RequestMapping("/wx/")
public class WxController {
 
    String token="78******23";
 
    @ApiOperation(value = "微信 token URL 验证")
    @GetMapping(value = "push")
    public void pushGet(HttpServletRequest request, HttpServletResponse response) {
        String signature = request.getParameter("signature"); // 签名
        String echostr = request.getParameter("echostr"); // 随机字符串
        String timestamp = request.getParameter("timestamp"); // 时间戳
        String nonce = request.getParameter("nonce"); // 随机数
        log.debug("signature:{}", signature);
        log.debug("echostr:{}", echostr);
        log.debug("timestamp:{}", timestamp);
        log.debug("nonce:{}", nonce);
        System.out.println("signature:" + signature);
        String sha1 = getSHA1(token, timestamp, nonce);
        System.out.println("sha1:" + sha1);
        if (sha1.equals(signature)) {
            log.debug("成功");
            this.responseText(echostr, response);
        }
    }
 
    @ApiOperation(value = "接收微信事件")
    @PostMapping(value = "push")
    public void pushPost(HttpServletRequest request, HttpServletResponse response) {
        String signature = request.getParameter("signature"); // 签名
        String timestamp = request.getParameter("timestamp"); // 时间戳
        String nonce = request.getParameter("nonce"); // 随机数
        String sha1 = getSHA1(token, timestamp, nonce);
        if (sha1.equals(signature)) {
            Map<String, Object> map = null;
            try {
                // input 流返回是 xml 格式 这里转 map 了
                map = XmlUtil.parseXMLToMap(request.getInputStream());
            } catch (IOException e) {
                e.printStackTrace();
            }
            log.debug("事件消息体:{}", map);
 
            this.responseText("", response); // 回复空串，微信服务器不会对此作任何处理
        }
 
    }
 
    /**
     * 返回响应结果
     *
     * @param text     响应内容
     * @param response
     */
    public void responseText(String text, HttpServletResponse response) {
        response.setCharacterEncoding("UTF-8");
        response.setContentType("text/plan;charset=UTF-8");
        PrintWriter writer = null;
        try {
            writer = response.getWriter();
        } catch (IOException e) {
            e.printStackTrace();
        }
        writer.write(text);
        writer.flush();
        writer.close();
    }
 
    /**
     * 用SHA1算法生成安全签名
     *
     * @param token     票据
     * @param timestamp 时间戳
     * @param nonce     随机字符串
     * @return 安全签名
     */
    public String getSHA1(String token, String timestamp, String nonce) {
        try {
            String[] array = new String[]{token, timestamp, nonce};
            StringBuffer sb = new StringBuffer();
            // 字符串排序
            Arrays.sort(array);
            for (int i = 0; i < 3; i++) {
                sb.append(array[i]);
            }
            String str = sb.toString();
            // SHA1签名生成
            MessageDigest md = MessageDigest.getInstance("SHA-1");
            md.update(str.getBytes());
            byte[] digest = md.digest();
 
            StringBuffer hexstr = new StringBuffer();
            String shaHex = "";
            for (int i = 0; i < digest.length; i++) {
                shaHex = Integer.toHexString(digest[i] & 0xFF);
                if (shaHex.length() < 2) {
                    hexstr.append(0);
                }
                hexstr.append(shaHex);
            }
            return hexstr.toString();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
 
}

响应结果
消息验证

signature:207e05105427e1203e769245b3860212c0ffcc56
echostr:5692172970033782203
timestamp:1685068850
nonce:499790541
signature:207e05105427e1203e769245b3860212c0ffcc56
sha1:207e05105427e1203e769245b3860212c0ffcc56
成功

事件推送
打开公众号发送消息，接口就可以获取到推送事件消息内容了

{"Content":"嘻嘻嘻","CreateTime":"1685068967","ToUserName":"gh_2121212a95","FromUserName":"333333333nSg8OlaSuB0d-f8FKZo","MsgType":"text","MsgId":"24124387253374797"}

其他信息
公众号配置

内网穿透

(完)