跨域问题,其实百度上面有一堆的解决方案
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。
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@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);
}
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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:
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@Component
public class CorsControllerFilter implements Filter{
@Override
public void destroy() {
// TODO Auto-generated method stub
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
// TODO Auto-generated method stub
HttpServletResponse 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);
}
@Override
public void init(FilterConfig arg0) throws ServletException {
// TODO Auto-generated method stub
}
}
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在启动类中增加配置
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@Bean
public FilterRegistrationBean filterRegistrationBean() {
FilterRegistrationBean registrationBean = new FilterRegistrationBean();
CorsControllerFilter corsControllerFilter = new CorsControllerFilter();
registrationBean.setFilter(corsControllerFilter);
return registrationBean;
}
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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。
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public class OptionsInterceptor 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 stub
if (request.getMethod().equals( "OPTIONS" )){
response.setStatus(HttpServletResponse.SC_OK);
return false ;
}
return true ;
}
}
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配置web配置文件,加载拦截器。
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@Configuration
public class WebMvcConfiguration extends WebMvcConfigurationSupport{
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor( new OptionsInterceptor()).addPathPatterns( "/**" );
}
}
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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
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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 stub
response.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 ;
}
}
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在WebMvcConfiguration里面增加配置,注意要写在OptionsInterceptor的前面
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registry.addInterceptor( new CrossInterceptor()).addPathPatterns( "/**" );
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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服务器之家。
原文链接:https://blog.csdn.net/zhuwei_clark/article/details/83413763