import javax.servlet.*;import javax.servlet.http.HttpServletRequest;import java.io.IOException;import java.util.HashMap;import java.util.Map;/** * <p>filter---参数过滤器</p><br> * <p>请求已经有该参数，（过滤器覆盖value是无效的）</p><br> * TODO(设置自定义request参数) * * @author han.sun * @version 1.0.0 * @since 2019/5/5 13:12 */public class RequestParameterFilter implements Filter { @Override public void init(FilterConfig filterConfig) { } @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain chain) throws IOException, ServletException { HttpServletRequest request = (HttpServletRequest) servletRequest; String msgId = request.getParameter("msgId"); if (msgId == null) { Map<String, Object> map = new HashMap<String, Object>(16); map.put("msgId", new String[]{System.currentTimeMillis() + ""}); RequestParameterWrapper requestParameterWrapper = new RequestParameterWrapper(request, map); chain.doFilter(requestParameterWrapper, servletResponse); }else { chain.doFilter(servletRequest, servletResponse); } } @Override public void destroy() { }}
转载于:https://www.cnblogs.com/han-sun/p/10845689.html
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