在前后端分离的趋势下，前端和后端的交互难免会出现跨域的情况，配置跨域有很多种方法：
1、使用spring boot配置跨域
a. 定义一个配置类，实现 WebMvcConfigurer 接口，这个接口可配置拦截器、参数解析器、返回值解析器、跨域支持等等
package io.xiongdi.config;import io.xiongdi.interceptor.AuthorizationInterceptor;import io.xiongdi.resolver.LoginUserHandlerMethodArgumentResolver;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.annotation.Configuration;import org.springframework.web.method.support.HandlerMethodArgumentResolver;import org.springframework.web.servlet.config.annotation.CorsRegistry;import org.springframework.web.servlet.config.annotation.InterceptorRegistry;import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;import java.util.List;/** * @author wujiaxing ** 此配置类可配置拦截器、参数解析器、返回值解析器、跨域支持等等 *
*/@Configurationpublic class WebMvcConfig implements WebMvcConfigurer { @Autowired private AuthorizationInterceptor authorizationInterceptor; @Autowired private LoginUserHandlerMethodArgumentResolver loginUserHandlerMethodArgumentResolver; /** * 拦截器配置 * @param registry */ @Override public void addInterceptors(InterceptorRegistry registry) { registry.addInterceptor(authorizationInterceptor).addPathPatterns("/api/**"); } /** * 跨域支持配置 * @param registry */ @Override public void addCorsMappings(CorsRegistry registry) { registry.addMapping("/**").allowCredentials(true).allowedOrigins("*").allowedMethods("GET", "PUT", "DELETE", "POST", "OPTIONS").maxAge(3600); } /** * 参数解析配置 * @param resolvers */ @Override public void addArgumentResolvers(Listresolvers) { resolvers.add(loginUserHandlerMethodArgumentResolver); }}
b. 简单的配置就支持跨域了，要注意匹配路径，我写成 /* 就不行，/** 就可以