如何在过滤器的帮助下检查客户端是否发送了有效的JSON？

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

public class JsonFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        // 初始化操作，可略过
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        // 获取请求数据
        String requestData = request.getReader().lines().collect(Collectors.joining(System.lineSeparator()));

        // 解析JSON
        try {
            JSONObject json = new JSONObject(requestData);
            // JSON解析成功，说明客户端发送的是有效的JSON
        } catch (JSONException e) {
            // JSON解析失败，说明客户端发送的不是有效的JSON
        }

        // 继续执行后续逻辑
        filterChain.doFilter(servletRequest, servletResponse);
    }

    @Override
    public void destroy() {
        // 销毁操作，可略过
    }
}

<filter>
    <filter-name>JsonFilter</filter-name>
    <filter-class>com.example.JsonFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>JsonFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>