springBoot 获取请求头header里面的信息方式

素颜马尾好姑娘i 2022-09-16 05:50 1626阅读 0赞

项目中后端服务经常需要前端传的请求头里的信息，今天给大家分享一下：

1、循环获取：

/**
         * 获取判断请求头的参数
         * @return
         */
        public static boolean checkHeaderName(){
            RequestAttributes ra = RequestContextHolder.getRequestAttributes();
            if(Objects.isNull(ra)){
                log.info("服务里RequestAttributes对象为空");
                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;
                }
                /**
                 * 或者其他的业务处理
                 */
            }
            return false;
        }

2、根据具体的key 获取：

/**
         *获取 判断请求头的参数
         * @return
         */
        public static boolean checkHeader(){
            RequestAttributes ra = RequestContextHolder.getRequestAttributes();
            if(Objects.isNull(ra)){
                log.info("服务里RequestAttributes对象为空");
                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;
            }
            /**
             * 或者其他的业务处理
             */
            return false;
        }

3、修改请求头信息：只能依靠反射原原理（`HttpServletRequest`中定义的对Header的操作全是只读，没有修改）。假设的场景是，需要对请求Header统一添加一个`x-request-id`，通过这个ID来从日志中定位每一个请求。

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 {
    			// 从 RequestFacade 中获取 org.apache.catalina.connector.Request
    			Field connectorField = ReflectionUtils.findField(RequestFacade.class, "request", Request.class);
    			connectorField.setAccessible(true);
    			Request connectorRequest = (Request) connectorField.get(req);
    			
    			// 从 org.apache.catalina.connector.Request 中获取 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);
    			
    			// 从 org.apache.coyote.Request 中获取 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) {
    		// 添加一个Header，随机生成请求ID
    		mimeHeaders.addValue("x-request-id").setString(UUID.randomUUID().toString());;
    		// 移除一个header
    		mimeHeaders.removeHeader("User-Agent");
    	}
    }

[参考    ： https://springboot.io/t/topic/3643][_ _ https_springboot.io_t_topic_3643]

到此，关于请求头信息的增删改查分享完毕。

[_ _ https_springboot.io_t_topic_3643]: http://xn--8nr862bpspiwe