Springboot通过过滤器实现对请求头的修改

package com.example.demo.filter;

import org.springframework.util.StringUtils;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

/**
* @Description: 滤器实现对请求头的修改
* @Author: wanghui
*/
@WebFilter
public class AuthHeaderSettingFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        Filter.super.init(filterConfig);
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest) servletRequest;
        HeaderMapRequestWrapper headerMapRequestWrapper = new HeaderMapRequestWrapper(req);
        String token = req.getHeader("token");
        if(!StringUtils.isEmpty(token)){
            headerMapRequestWrapper.addHeader("token",token);
        }
    }

    @Override
    public void destroy() {
        Filter.super.destroy();
    }
}

　　

package com.example.demo.filter;

import org.springframework.util.StringUtils;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.util.HashMap;
import java.util.Map;

/**
* @Description: 重写getHeader
* @Author: wanghui
*/
public class HeaderMapRequestWrapper extends HttpServletRequestWrapper {

    private Map headerMap = new HashMap();

    public HeaderMapRequestWrapper(HttpServletRequest request) {
        super(request);
    }

    public void addHeader(String name,String value){
        headerMap.put(name,value);
    }

    @Override
    public String getHeader(String name){
        String headerValue = super.getHeader(name);
        String value = (String) this.headerMap.get(name);
        if(!StringUtils.isEmpty(value)){
            return value;
        }
        return headerValue;
    }

}