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1. 编写过滤器类：

package gentle;import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;/*** 改写所有请求头* @author silence* @date 2018/12/11 15:19*/@WebFilter(filterName = "requestFilter",urlPatterns = {"/*"})
public class RequestFilter implements Filter {@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}@Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {HttpServletResponse response = (HttpServletResponse) servletResponse;HttpServletRequest request = (HttpServletRequest)servletRequest;String origin = request.getHeader("Origin");response.setHeader("Access-Control-Allow-Origin", "*");response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");response.setHeader("Access-Control-Max-Age", "3600");response.setHeader("Access-Control-Allow-Headers", "x-requested-with,Authorization");response.setHeader("Access-Control-Allow-Credentials", "true");String method = request.getMethod();if(method.equalsIgnoreCase("OPTIONS")){servletResponse.getOutputStream().write("Success".getBytes("utf-8"));}else{filterChain.doFilter(servletRequest, servletResponse);}}@Overridepublic void destroy() {}}

2.  在过滤器类上加注解：

import javax.servlet.annotation.WebFilter;@WebFilter(filterName = "requestFilter",urlPatterns = {"/*"})

3.  在项目启动类上加注解：

import org.springframework.boot.web.servlet.ServletComponentScan;@ServletComponentScan

4.  启动工程就行了。