java解决请求跨域的两种方法
java解决请求跨域问题，有以下两种写法
1.使用拦截器，实现javax.servlet.Filter接口
importjavax.servlet.Filter;
importjavax.servlet.FilterChain;
importjavax.servlet.FilterConfig;
importjavax.servlet.ServletException;
importjavax.servlet.ServletRequest;
importjavax.servlet.ServletResponse;
importjavax.servlet.annotation.WebFilter;
importjavax.servlet.http.HttpServletResponse;
@WebFilter(filterName="CorsFilter",urlPatterns="*.do")
publicclassCorsFilterimplementsFilter{
@Override
publicvoiddestroy(){
}
@Override
publicvoiddoFilter(ServletRequestreq,ServletResponseresp,FilterChainchain)
throwsIOException,ServletException{
HttpServletResponseresponse=(HttpServletResponse)resp;
response.setHeader("Access-Control-Allow-Origin","*");//解决跨域访问报错
response.setHeader("Access-Control-Allow-Methods","POST,PUT,GET,OPTIONS,DELETE");
response.setHeader("Access-Control-Max-Age","3600");//设置过期时间
response.setHeader("Access-Control-Allow-Headers","Origin,X-Requested-With,Content-Type,Accept,client_id,uuid,Authorization");
response.setHeader("Cache-Control","no-cache,no-store,must-revalidate");//支持HTTP1.1.
response.setHeader("Pragma","no-cache");//支持HTTP1.0.response.setHeader("Expires","0");
chain.doFilter(req,resp);
}
@Override
publicvoidinit(FilterConfigarg0)throwsServletException{
}
}
如果想用xml的形式配置拦截器，可以删除@WebFilter(filterName="CorsFilter",urlPatterns="*.do")，然后在web.xml中添加下面的配置
CorsFilter com.huaming.filter.CorsFilter CorsFilter *.do
2.使用注解的形式，配置org.springframework.web.filter.CorsFilter，通常springboot项目多数使用这种方式
importorg.springframework.web.filter.CorsFilter;
importorg.springframework.context.annotation.Bean;
importorg.springframework.context.annotation.Configuration;
importorg.springframework.web.cors.CorsConfiguration;
importorg.springframework.web.cors.UrlBasedCorsConfigurationSource;
/**
*解决跨域问题springboot所需配置
*/
@Configuration
publicclassCORSConfiguration{
@Bean
publicCorsFiltercorsFilter(){
//1.添加CORS配置信息
CorsConfigurationconfig=newCorsConfiguration();
//1)允许的域,不要写*，否则cookie就无法使用了
config.addAllowedOrigin("*");
config.addAllowedHeader("*");//允许任何头
config.addAllowedMethod("*");//允许任何方法（post、get等）
//2)是否发送Cookie信息
config.setAllowCredentials(true);
//3)允许的请求方式
config.addAllowedMethod("OPTIONS");
config.addAllowedMethod("HEAD");
config.addAllowedMethod("GET");
config.addAllowedMethod("PUT");
config.addAllowedMethod("POST");
config.addAllowedMethod("DELETE");
config.addAllowedMethod("PATCH");
//4）允许的头信息
config.addAllowedHeader("*");
//5)配置有效时长
config.setMaxAge(3600*24L);
//2.添加映射路径，我们拦截一切请求
UrlBasedCorsConfigurationSourceconfigSource=newUrlBasedCorsConfigurationSource();
configSource.registerCorsConfiguration("/**",config);
//3.返回新的CorsFilter.
returnnewCorsFilter(configSource);
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。