本質上來講，request請求當中的引數是無法更改的，也不能新增或者刪除。
　　但在後臺程式中，一般對request的引數的操作，都是通過request的getParameter、getParameterNames、getParameterValues等方法執行的；所以我們要是能重寫這些方法，就從側面改變了request的請求引數。恰好，servlet就提供了一個HttpServletRequestWrapper類來供大家去繼承（該類是HttpServletRequest的封裝類），重寫request相關方法。

這樣可以修改比如shiro框架中的JSESSIONID，使單頁H5中呼叫介面時只需要在頭部新增在別處登入之後拿到的jsessionid的值，就能保證是登入狀態。

       headers: {
            "token":"JSESSIONID=xxxx"
        }

具體服務端實現如下：

package webapp.conf;

import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.filter.OncePerRequestFilter;

 
import javax.servlet.*;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.*;

/**
 * 攔截器配置
 */
@Configuration
public class FilterConfig {

    @Bean
    
 
public FilterRegistrationBean modifyParametersFilter() {
        FilterRegistrationBean registration = new FilterRegistrationBean();
        registration.setFilter(new ModifyParametersFilter());
        registration.addUrlPatterns("/*");              // 攔截路徑
        registration.setName("modifyParametersFilter"); // 攔截器名稱
        registration.setOrder(1);                       // 順序
        return registration;
    }

    /**
     * 自定義攔截器
     */
    class ModifyParametersFilter extends OncePerRequestFilter {
        @Override
        protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
            ModifyHttpServletRequestWrapper requestWrapper = new ModifyHttpServletRequestWrapper(request);
            filterChain.doFilter(requestWrapper, response);
        }
    }

    /**
     * cookie配置
     */
    class ModifyHttpServletRequestWrapper extends HttpServletRequestWrapper {
        ModifyHttpServletRequestWrapper(HttpServletRequest request) {
            super(request);
        }
        // 設定/更新自定義cookie
        public Cookie[] getCookies() {
            HttpServletRequest request = (HttpServletRequest) getRequest();
            // 獲取前端頭部傳輸的token
            String token = request.getHeader("token");
            Cookie[] cookies = request.getCookies();
            if (token != null && !"".equals(token)) {
                Cookie jCookie = new Cookie("JSESSIONID", token);
                if (cookies == null || cookies.length == 0) {
                    cookies = new Cookie[]{jCookie};
                    return cookies;
                } else {
                    List<Cookie> cookieList = new ArrayList<>(Arrays.asList(cookies));
                    cookieList.add(jCookie);
                    Cookie[] modifyCookies = new Cookie[cookies.length + 1];
                    for (int i = 0; i < cookieList.size(); i++) {
                        modifyCookies[i] = cookieList.get(i);
                    }
                    return modifyCookies;
                }
            }
            return cookies;
        }
    }

}

上面的JSESSIONID為cookie的key，可以自行設定。