Java中的HttpServletRequestWrapper用法解析

/**
 * @Auther 
 * @Date 2023-06-06 8:38
 */
public class MyHttpServletRequestWrapper extends HttpServletRequestWrapper {
    /**
     * 定义参数
     */
    private Map<String, String[]> parameterMaps;
    /**
     * @param request
     */
    public MyHttpServletRequestWrapper(HttpServletRequest request) {
        super(request);
        parameterMaps = new HashMap<>(request.getParameterMap());
    }
    @Override
    public String[] getParameterValues(String name) {
        String[] values = parameterMaps.get(name);
        if (values == null) {
            values = super.getParameterValues(name);
        }
        return values;
    }
    /**
     * 设置参数
     * @param name
     * @param value
     */
    public void setParameter(String name, String... value) {
        parameterMaps.put(name, value);
    }
}

/**
 * @Auther 
 * @Date 2023-06-06 8:38
 */
@WebFilter(urlPatterns = {"/**"})
public class MyFilter implements Filter {
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        MyHttpServletRequestWrapper MyHttpServletRequest = new MyHttpServletRequestWrapper((HttpServletRequest) request);
        MyHttpServletRequest.setParameter("name", "zhangsan");
        chain.doFilter(MyHttpServletRequest, response);
    }
}