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Springboot如何通過filter修改Header的值

更新時間：2023年07月19日 10:15:05 作者：小石潭記丶

這篇文章主要介紹了Springboot如何通過filter修改Header的值問題，具有很好的參考價值，希望對大家有所幫助。如有錯誤或未考慮完全的地方，望不吝賜教

Springboot通過filter修改Header的值

import org.apache.tomcat.util.http.MimeHeaders;
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.lang.reflect.Field;
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 {
            // 修改請求頭
            Map<String, String> map = new HashMap<>();
            modifyHeaders(map, request);
            // 修改cookie
            ModifyHttpServletRequestWrapper requestWrapper = new ModifyHttpServletRequestWrapper(request);
            String token = request.getHeader("token");
            if (token != null && !"".equals(token)) {
                requestWrapper.putCookie("SHIROSESSIONID", token);
            }
            // finish
            filterChain.doFilter(requestWrapper, response);
        }
    }
    /**
     * 修改請求頭信息
     * @param headerses
     * @param request
     */
  private void modifyHeaders(Map<String, String> headerses, HttpServletRequest request {
        if (headerses == null || headerses.isEmpty()) {
            return;
        }
        Class<? extends HttpServletRequest> requestClass = request.getClass();
        try {
            Field request1 = requestClass.getDeclaredField("request");
            request1.setAccessible(true);
            Object o = request1.get(request);
            Field coyoteRequest = o.getClass().getDeclaredField("coyoteRequest");
            coyoteRequest.setAccessible(true);
            Object o1 = coyoteRequest.get(o);
            Field headers = o1.getClass().getDeclaredField("headers");
            headers.setAccessible(true);
            MimeHeaders o2 = (MimeHeaders)headers.get(o1);
            for (Map.Entry<String, String> entry : headerses.entrySet()) {
                o2.removeHeader(entry.getKey());
                o2.addValue(entry.getKey()).setString(entry.getValue());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    /**
     * 修改cookie信息
     */
    class ModifyHttpServletRequestWrapper extends HttpServletRequestWrapper {
        private Map<String, String> mapCookies;
        ModifyHttpServletRequestWrapper(HttpServletRequest request) {
            super(request);
            this.mapCookies = new HashMap<>();
        }
        public 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()]);
            }

Springboot獲取請求頭header里面的信息

項(xiàng)目中后端服務(wù)經(jīng)常需要前端傳的請求頭里的信息，給大家分享一下：

1、循環(huán)獲取

/**
? ? ?* 獲取判斷請求頭的參數(shù)
? ? ?* @return
? ? ?*/
? ? public?static?boolean checkHeaderName(){
? ? ? ? RequestAttributes ra = RequestContextHolder.getRequestAttributes();
? ? ? ? if(Objects.isNull(ra)){
? ? ? ? ? ? log.info("服務(wù)里RequestAttributes對象為空");
? ? ? ? ? ? return false;
? ? ? ? }
? ? ? ? ServletRequestAttributes sra = (ServletRequestAttributes) ra;
? ? ? ? HttpServletRequest request = sra.getRequest();
? ? ? ? Enumeration<String> enumeration = request.getHeaderNames();
? ? ? ? while (enumeration.hasMoreElements()) {
? ? ? ? ? ? String name = enumeration.nextElement();
? ? ? ? ? ? String value = request.getHeader(name);
? ? ? ? ? ? if(name.equals("accept-"+HeaderEnum.language.name()) && value.equals(HeaderEnum.language.head())){
? ? ? ? ? ? ? ? return true;
? ? ? ? ? ? }
? ? ? ? ? ? /**
? ? ? ? ? ? ?* 或者其他的業(yè)務(wù)處理
? ? ? ? ? ? ?*/
? ? ? ? }
? ? ? ? return false;
? ? }

2、根據(jù)具體的key獲取

/**
? ? ?*獲取 判斷請求頭的參數(shù)
? ? ?* @return
? ? ?*/
? ? public static?boolean?checkHeader(){
? ? ? ? RequestAttributes ra = RequestContextHolder.getRequestAttributes();
? ? ? ? if(Objects.isNull(ra)){
? ? ? ? ? ? log.info("服務(wù)里RequestAttributes對象為空");
? ? ? ? ? ? return false;
? ? ? ? }
? ? ? ? ServletRequestAttributes sra = (ServletRequestAttributes) ra;
? ? ? ? HttpServletRequest request = sra.getRequest();
? ? ? ? String head = request.getHeader("accept-"+HeaderEnum.language.name());
? ? ? ? if(head.equals(HeaderEnum.language.head())){
? ? ? ? ? ? return true;
? ? ? ? }
? ? ? ? /**
? ? ? ? ?* 或者其他的業(yè)務(wù)處理
? ? ? ? ?*/
? ? ? ? return false;
? ? }

3、修改請求頭信息

只能依靠反射原原理（HttpServletRequest中定義的對Header的操作全是只讀，沒有修改）。

假設(shè)的場景是，需要對請求Header統(tǒng)一添加一個x-request-id，通過這個ID來從日志中定位每一個請求。

import java.io.IOException;
import java.lang.reflect.Field;
import java.util.UUID;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.catalina.connector.Request;
import org.apache.catalina.connector.RequestFacade;
import org.apache.tomcat.util.http.MimeHeaders;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
import org.springframework.util.ReflectionUtils;
@WebFilter(urlPatterns = "/*")
@Component
@Order(-999)
public class RequestIdGenFilter extends HttpFilter {
?? ?/**
?? ? *?
?? ? */
?? ?private static final long serialVersionUID = 1787347739651657706L;
?? ?@Override
?? ?protected void doFilter(HttpServletRequest req, HttpServletResponse res, FilterChain chain) throws IOException, ServletException {
?? ??? ?try {
?? ??? ??? ?// 從 RequestFacade 中獲取 org.apache.catalina.connector.Request
?? ??? ??? ?Field connectorField = ReflectionUtils.findField(RequestFacade.class, "request", Request.class);
?? ??? ??? ?connectorField.setAccessible(true);
?? ??? ??? ?Request connectorRequest = (Request) connectorField.get(req);
?? ??? ??? ?// 從 org.apache.catalina.connector.Request 中獲取 org.apache.coyote.Request
?? ??? ??? ?Field coyoteField = ReflectionUtils.findField(Request.class, "coyoteRequest", org.apache.coyote.Request.class);
?? ??? ??? ?coyoteField.setAccessible(true);
?? ??? ??? ?org.apache.coyote.Request coyoteRequest = (org.apache.coyote.Request) coyoteField.get(connectorRequest);
?? ??? ??? ?// 從 org.apache.coyote.Request 中獲取 MimeHeaders
?? ??? ??? ?Field mimeHeadersField = ?ReflectionUtils.findField(org.apache.coyote.Request.class, "headers", MimeHeaders.class);
?? ??? ??? ?mimeHeadersField.setAccessible(true);
?? ??? ??? ?MimeHeaders mimeHeaders = ?(MimeHeaders) mimeHeadersField.get(coyoteRequest);
?? ??? ??? ?this.mineHeadersHandle(mimeHeaders);
?? ??? ?} catch (Exception e) {
?? ??? ??? ?throw new RuntimeException(e);
?? ??? ?}
?? ??? ?super.doFilter(req, res, chain);
?? ?}
?? ?protected void mineHeadersHandle (MimeHeaders mimeHeaders) {
?? ??? ?// 添加一個Header，隨機(jī)生成請求ID
?? ??? ?mimeHeaders.addValue("x-request-id").setString(UUID.randomUUID().toString());;
?? ??? ?// 移除一個header
?? ??? ?mimeHeaders.removeHeader("User-Agent");
?? ?}
}