package com.xy.filter; import com.xy.http.HttpContent; import javax.servlet.*; import javax.servlet.annotation.WebFilter; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; /** * @author chengzhao */ //拦截请求 @WebFilter(urlPatterns = "/*") public class XssFilter implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { } @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { HttpServletRequest request= (HttpServletRequest) servletRequest; //先进行转义在把请求返回 XssHttpServletRequestWrapper wrapper=new XssHttpServletRequestWrapper(request); filterChain.doFilter(wrapper,servletResponse); } @Override public void destroy() { } }如何在这个类中加入错误code和提示？

您可以在doFilter方法中进行错误处理。例如，您可以检查请求是否包含恶意代码，并根据情况设置错误代码和错误消息。如果检测到恶意代码，您可以使用HttpServletResponse对象设置错误代码和错误消息。下面是一个示例代码片段：

@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
    HttpServletRequest request= (HttpServletRequest) servletRequest;
    //先进行转义在把请求返回
    XssHttpServletRequestWrapper wrapper=new XssHttpServletRequestWrapper(request);
    
    //检查请求是否包含恶意代码
    if(isMaliciousRequest(wrapper)) {
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        response.sendError(HttpServletResponse.SC_BAD_REQUEST, "请求包含恶意代码");
    } else {
        filterChain.doFilter(wrapper,servletResponse);
    }
}

在这个示例中，如果检测到恶意代码，将设置代码为400（SC_BAD_REQUEST）的错误消息。您可以将错误代码和错误消息更改为适合您的应用程序的值。