HttpServletRequest修改/添加header和cookie参数

实现功能：

所有接口经过过滤器，获取每个接口的自定义头部(token)

判断如果是app访问，则给头部设置cookie，值为自定义token的值。

即：使用过滤器实现修改请求头headers

实现步骤：

1.自定义过滤器 ModifyParametersFilter.java 并继承 OncePerRequestFilter

package com.mobile.web.common;

import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
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.*;

/**
 * 自定义的过滤器,
 * Created by Administrator on 2017/6/19 0019.
 */
public class ModifyParametersFilter extends OncePerRequestFilter {
    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
            throws ServletException, IOException {
        // 修改cookie
        ModifyHttpServletRequestWrapper mParametersWrapper = new ModifyHttpServletRequestWrapper(request);
        String token = request.getHeader("token");
        if (token != null && !"".equals(token)) {
            mParametersWrapper.putCookie("JSESSIONID", token);
        }
        // finish
        filterChain.doFilter(mParametersWrapper, response);
    }

    /**
     * 修改cookie信息
     */
    private class ModifyHttpServletRequestWrapper extends HttpServletRequestWrapper {
        private Map<String, String> mapCookies;
        ModifyHttpServletRequestWrapper(HttpServletRequest request) {
            super(request);
            this.mapCookies = new HashMap<>();
        }
        void putCookie(String name, String value) {
            this.mapCookies.put(name, value);
        }
        public Cookie[] getCookies() {
            HttpServletRequest request = (HttpServletRequest) getRequest();
            Cookie[] cookies = request.getCookies();
            if (mapCookies == null || mapCookies.isEmpty()) {
                return cookies;
            }
            if (cookies == null || cookies.length == 0) {
                List<Cookie> cookieList = new LinkedList<>();
                for (Map.Entry<String, String> entry : mapCookies.entrySet()) {
                    String key = entry.getKey();
                    if (key != null && !"".equals(key)) {
                        cookieList.add(new Cookie(key, entry.getValue()));
                    }
                }
                if (cookieList.isEmpty()) {
                    return cookies;
                }
                return cookieList.toArray(new Cookie[cookieList.size()]);
            } else {
                List<Cookie> cookieList = new ArrayList<>(Arrays.asList(cookies));
                for (Map.Entry<String, String> entry : mapCookies.entrySet()) {
                    String key = entry.getKey();
                    if (key != null && !"".equals(key)) {
                        for (int i = 0; i < cookieList.size(); i++) {
                            if(cookieList.get(i).getName().equals(key)){
                                cookieList.remove(i);
                            }
                        }
                        cookieList.add(new Cookie(key, entry.getValue()));
                    }
                }
                return cookieList.toArray(new Cookie[cookieList.size()]);
            }
        }
    }
}

2.在web.xml中注册该过滤器：

    <filter>
        <filter-name>ModifyParametersFilter</filter-name>
        <filter-class>com.xiyinli.web.common.ModifyParametersFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>ModifyParametersFilter</filter-name>
        <url-pattern>/*</url-pattern>
        <!-- 直接从客户端过来的请求以及通过forward过来的请求都要经过该过滤器 -->
        <dispatcher>REQUEST</dispatcher>
        <dispatcher>FORWARD</dispatcher>
    </filter-mapping>

如：

参考文章：

继承HttpServletRequestWrapper以实现在Filter中修改HttpServletRequest的参数