SlingServletFilter：在执行doFilter之前获取状态码

要在执行SlingServletFilter的doFilter方法之前获取状态码，您可以使用以下解决方法：

1. 使用HttpServletResponseWrapper：

import javax.servlet.*;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;
import java.io.IOException;

public class CustomFilter implements Filter {
    private FilterConfig filterConfig;

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        this.filterConfig = filterConfig;
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletResponse httpServletResponse = (HttpServletResponse) response;
        HttpServletResponseWrapper wrapper = new HttpServletResponseWrapper(httpServletResponse) {
            @Override
            public void setStatus(int sc) {
                // 在这里获取状态码
                System.out.println("Status Code: " + sc);
                super.setStatus(sc);
            }
        };

        chain.doFilter(request, wrapper);
    }

    @Override
    public void destroy() {

    }
}

2. 使用自定义的ResponseWrapper：

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

public class CustomFilter implements Filter {
    private FilterConfig filterConfig;

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        this.filterConfig = filterConfig;
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        CustomResponseWrapper wrapper = new CustomResponseWrapper((HttpServletResponse) response);

        chain.doFilter(request, wrapper);

        // 获取状态码
        int statusCode = wrapper.getStatus();
        System.out.println("Status Code: " + statusCode);
    }

    @Override
    public void destroy() {

    }
}

class CustomResponseWrapper extends HttpServletResponseWrapper {
    private int statusCode;

    public CustomResponseWrapper(HttpServletResponse response) {
        super(response);
    }

    @Override
    public void setStatus(int sc) {
        super.setStatus(sc);
        this.statusCode = sc;
    }

    @Override
    public void setStatus(int sc, String sm) {
        super.setStatus(sc, sm);
        this.statusCode = sc;
    }

    @Override
    public void sendError(int sc) throws IOException {
        super.sendError(sc);
        this.statusCode = sc;
    }

    @Override
    public void sendError(int sc, String msg) throws IOException {
        super.sendError(sc, msg);
        this.statusCode = sc;
    }

    public int getStatus() {
        return statusCode;
    }
}

这些解决方法中，您可以根据自己的需求选择其中一个来实现在执行doFilter方法之前获取状态码。