SpringBoot+Vue解决跨域问题几种处理方案介绍

package com.sysg.config;


import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;

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


/**
 * @author 77916
 */

@Component
@Order(1)
@WebFilter(filterName = "CoresFilter", urlPatterns = "/*")
public class CoresFilter implements Filter {
    @Override
    public void destroy() {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
            throws IOException, ServletException {
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //表示所有的域都可以接受
        response.setHeader("Access-Control-Allow-Origin", "*");
        //允许所有的方法
        response.setHeader("Access-Control-Allow-Methods","POST,GET,DELETE,PUT,OPTIONS");
        //请求得到结果的有效期
        response.setHeader("Access-Control-Max-Age","3600");
        response.setHeader("Access-Control-Allow-Headers","x-requested-with,Content-Type,access-control-allow-origin,version-info");
        //该值是一个boolean值,表示允许发送cookie，默认情况下cookie不包含在cores中，设置为true
        response.setHeader("Access-Control-Allow-Credentials","true");
        filterChain.doFilter(servletRequest,servletResponse);
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }
}

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
    <!-- 跨域问题解决 -->
    <filter>
        <filter-name>CoresFilter</filter-name>
        <filter-class>com.sysg.config.CoresFilter</filter-class>
        <init-param>
            <param-name>IsCross</param-name>
            <param-value>true</param-value>
        </init-param>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>CoresFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

​​​​​​​</web-app>

package com.sysg.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
@EnableWebMvc
public class WebMvcConfig implements WebMvcConfigurer {
    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
                .allowedOrigins("*")
                .allowedHeaders("*")
                .allowedMethods("GET", "POST", "PUT", "OPTIONS", "DELETE", "PATCH")
                .maxAge(3600);
    }
}