Spring Cloud项目前后端分离跨域的操作
针对普通的情况其实百度上面的方案都是可行的。
我这里主要介绍2种情况。当然我这里的配置都是基于网关的,而不是基于服务的。
1、没有增加权限验证。
2、增加了spring security的权限验证(我这里是基于keyCloak),增加了Authorization
首先我们介绍第一种情况的解决方法,这个很简单,只需要在启动类里面配置过滤器就可以解决。
@Bean public CorsFilter corsFilter() {//1.添加CORS配置信息CorsConfiguration config = new CorsConfiguration(); //放行哪些原始域 config.addAllowedOrigin('*'); //是否发送Cookie信息 config.setAllowCredentials(true); //放行哪些原始域(请求方式) config.addAllowedMethod('*'); //放行哪些原始域(头部信息) config.addAllowedHeader('*'); //暴露哪些头部信息(因为跨域访问默认不能获取全部头部信息) config.addExposedHeader('*'); //2.添加映射路径UrlBasedCorsConfigurationSource configSource = new UrlBasedCorsConfigurationSource();configSource.registerCorsConfiguration('/**', config); //3.返回新的CorsFilter.return new CorsFilter(configSource); }
我遇到情况就是第二种了,这种情况上面的方式基本没有作用,我这里使用的是keyCloak做的权限验证。
首先增加过滤器配置:
@Componentpublic class CorsControllerFilter implements Filter{@Overridepublic void destroy() {// TODO Auto-generated method stub} @Overridepublic void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)throws IOException, ServletException {// TODO Auto-generated method stubHttpServletResponse res = (HttpServletResponse) response;res.setContentType('text/html;charset=UTF-8');res.setHeader('Access-Control-Allow-Origin', '*');res.setHeader('Access-Control-Allow-Methods', 'POST, GET, OPTIONS, DELETE ,PUT');res.setHeader('Access-Control-Max-Age', '3600');res.setHeader('Access-Control-Allow-Headers', '*');res.setHeader('Access-Control-Allow-Credentials', 'true');res.setHeader('XDomainRequestAllowed', '1');chain.doFilter(request, response);} @Overridepublic void init(FilterConfig arg0) throws ServletException {// TODO Auto-generated method stub}}
在启动类中增加配置
@Bean public FilterRegistrationBean filterRegistrationBean() { FilterRegistrationBean registrationBean = new FilterRegistrationBean(); CorsControllerFilter corsControllerFilter = new CorsControllerFilter(); registrationBean.setFilter(corsControllerFilter); return registrationBean; }
但是针对某些请求,他会先请求OPTIONS请求,造成权限验证失败。所以增加拦截器配置,对所有的OPTIONS的请求直接放行,返回200的状态。
public class OptionsInterceptor implements HandlerInterceptor { @Overridepublic void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3)throws Exception {// TODO Auto-generated method stub} @Overridepublic void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)throws Exception {// TODO Auto-generated method stub} @Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {// TODO Auto-generated method stubif(request.getMethod().equals('OPTIONS')){ response.setStatus(HttpServletResponse.SC_OK); return false;}return true;}}
配置web配置文件,加载拦截器。
@Configurationpublic class WebMvcConfiguration extends WebMvcConfigurationSupport{ @Override public void addInterceptors(InterceptorRegistry registry) {registry.addInterceptor(new OptionsInterceptor()).addPathPatterns('/**'); }}
本来以为这样配置了应该是可以了,但是在请求的时候OPTIONS的请求居然还是报跨域的问题,增加拦截器允许跨域配置
public class CrossInterceptor implements HandlerInterceptor{ @Override public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3) throws Exception { // TODO Auto-generated method stub } @Override public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3) throws Exception { // TODO Auto-generated method stub } @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { // TODO Auto-generated method stubresponse.setHeader('Access-Control-Allow-Origin', '*');response.setHeader('Access-Control-Allow-Credentials', 'true');response.setHeader('Access-Control-Allow-Methods', 'POST, GET, OPTIONS, DELETE, PUT, HEAD');response.setHeader('Access-Control-Allow-Headers', '*');response.setHeader('Access-Control-Max-Age', '3600');return true; }}
在WebMvcConfiguration里面增加配置,注意要写在OptionsInterceptor的前面
registry.addInterceptor(new CrossInterceptor()).addPathPatterns('/**');
继续测试,跨域问题解决。对于原理其实我也不太清楚,欢迎各位沟通交流。
以上为个人经验,希望能给大家一个参考,也希望大家多多支持好吧啦网。
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