这是我写的回调函数，也触发了，但是从有错误提示。echostr参数不存在


21:45:54.609 [http-nio-9001-exec-1] INFO o.a.c.c.C.[.[.[/] - [log,173] - Initializing Spring DispatcherServlet 'dispatcherServlet'
2
1:45:54.673 [http-nio-9001-exec-1] ERROR c.d.f.w.e.GlobalExceptionHandler - [handleException,80] - 请求地址'/changde/wechat',发生系统异常.
org.springframework.web.bind.MissingServletRequestParameterException: Required request parameter 'echostr' for method parameter type String is not present


代码


@RequestMapping(value = "/wechat", method = {RequestMethod.GET, RequestMethod.POST})


@ResponseBody
public String verifyWeChatServer(
        @RequestParam(value = "signature", required = false) String signature,
        @RequestParam(value = "timestamp", required = false) String timestamp,
        @RequestParam(value = "nonce", required = false) String nonce,
        @RequestParam(value = "echostr", required = false) String echostr) {


    // 检查是否为微信服务器验证请求（GET 请求且参数完整）
    if (signature != null && timestamp != null && nonce != null && echostr != null) {
        System.out.println("接收到的参数：signature=" + signature +
                ", timestamp=" + timestamp +
                ", nonce=" + nonce +
                ", echostr=" + echostr);


        // 验证签名
        if (checkSignature(signature, timestamp, nonce)) {
            System.out.println("签名验证成功，返回echostr：" + echostr);
            return echostr;
        } else {
            System.err.println("签名验证失败！");
            return "Invalid signature";
        }
    } else {
        // 处理 POST 请求或缺少必要参数的情况
        System.out.println("非微信服务器验证请求或缺少必要参数，暂不处理");
        return "Non-verification request or missing parameters";
    }
}