Security框架中怎么使用CorsFilter解决前端跨域请求问题

本篇内容主要讲解"Security框架中怎么使用CorsFilter解决前端跨域请求问题"，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习"Security框架中怎么使用CorsFilter解决前端跨域请求问题"吧!

项目情况

最近做的pmdb项目是前后端分离的， 由于测试的时候是前端与后端联调，所以出现了跨域请求的问题。

浏览器默认会向后端发送一个Options方式的请求，根据后端的响应来判断后端支持哪些请求方式，支持才会真正的发送请求。

CORS介绍

CORS（Cross-Origin Resource Sharing 跨源资源共享），当一个请求url的协议、域名、端口三者之间任意一与当前页面地址不同即为跨域。

在日常的项目开发时会不可避免的需要进行跨域操作，而在实际进行跨域请求时，经常会遇到类似 No 'Access-Control-Allow-Origin' header is present on the requested resource.这样的报错。

这样的错误，一般是由于CORS跨域验证机制设置不正确导致的。

解决方案

注释：本项目使用的是SprintBoot+Security+JWT+Swagger

第一步

新建CorsFilter，在过滤器中设置相关请求头

package com.handlecar.basf_pmdb_service.filter; import org.springframework.web.filter.OncePerRequestFilter; import javax.servlet.*;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOException; public class CorsFilter extends OncePerRequestFilter { //public class CorsFilter implements Filter {//    static final String ORIGIN = "Origin";     protected void doFilterInternal(            HttpServletRequest request, HttpServletResponse response,            FilterChain filterChain) throws ServletException, IOException { //        String origin = request.getHeader(ORIGIN);         response.setHeader("Access-Control-Allow-Origin", "*");//* or origin as u prefer        response.setHeader("Access-Control-Allow-Credentials", "true");        response.setHeader("Access-Control-Allow-Methods", "PUT, POST, GET, OPTIONS, DELETE");        response.setHeader("Access-Control-Max-Age", "3600");//        response.setHeader("Access-Control-Allow-Headers", "content-type, authorization");        response.setHeader("Access-Control-Allow-Headers", "Origin, No-Cache, X-Requested-With, If-Modified-Since, Pragma, Last-Modified, Cache-Control, Expires, Content-Type, X-E4M-With, Authorization");        response.setHeader("XDomainRequestAllowed","1");        //使前端能够获取到        response.setHeader("Access-Control-Expose-Headers","download-status,download-filename,download-message");          if (request.getMethod().equals("OPTIONS"))//            response.setStatus(HttpServletResponse.SC_OK);            response.setStatus(HttpServletResponse.SC_NO_CONTENT);        else            filterChain.doFilter(request, response);     } //    @Override//    public void doFilter(ServletRequest req, ServletResponse res,//                         FilterChain chain) throws IOException, ServletException {////        HttpServletResponse response = (HttpServletResponse) res;//        //测试环境用【*】匹配，上生产环境后需要切换为实际的前端请求地址//        response.setHeader("Access-Control-Allow-Origin", "*");//        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");////        response.setHeader("Access-Control-Max-Age", "0");////        response.setHeader("Access-Control-Allow-Headers", "Origin, No-Cache, X-Requested-With, If-Modified-Since, Pragma, Last-Modified, Cache-Control, Expires, Content-Type, X-E4M-With, auth");////        response.setHeader("Access-Control-Allow-Credentials", "true");////        response.setHeader("XDomainRequestAllowed","1");//        chain.doFilter(req, res);//    }////    @Override//    public void destroy() {//    }////    @Override//    public void init(FilterConfig arg0) throws ServletException {//    }}

注释：这里的Access-Control-Expose-Headers的请求头是为了使前端能够获得到后端在response中自定义的header，不设置的话，前端只能看到几个默认显示的header。我这里是在使用response导出Excel的时候将文件名和下载状态信息以自定义请求头的形式放在了response的header里。

第二步

在Security的配置文件中初始化CorsFilter的Bean

 @Bean    public CorsFilter corsFilter() throws Exception {        return new CorsFilter();    }

第三步

在Security的配置文件中添加Filter配置，和映射配置

.antMatchers(HttpMethod.OPTIONS,"/**").permitAll()                    // 除上面外的所有请求全部需要鉴权认证。 .and() 相当于标示一个标签的结束，之前相当于都是一个标签项下的内容                .anyRequest().authenticated().and()                .addFilterBefore(corsFilter(), UsernamePasswordAuthenticationFilter.class)

附：该配置文件

package com.handlecar.basf_pmdb_service.conf;import com.handlecar.basf_pmdb_service.filter.CorsFilter;import com.handlecar.basf_pmdb_service.filter.JwtAuthenticationTokenFilter;import com.handlecar.basf_pmdb_service.security.JwtTokenUtil;import com.handlecar.basf_pmdb_service.security.CustomAuthenticationProvider;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.http.HttpMethod;import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity;import org.springframework.security.config.annotation.web.builders.HttpSecurity;import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;import org.springframework.security.config.http.SessionCreationPolicy;import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;//import com.allcom.security.JwtTokenUtil; @Configuration//@EnableWebSecurity is used to enable Spring Security's web security support and provide the Spring MVC integration@EnableWebSecurity@EnableGlobalMethodSecurity(prePostEnabled = true)public class WebSecurityConfig extends WebSecurityConfigurerAdapter {      private final CustomAuthenticationProvider customAuthenticationProvider;     @Autowired    public WebSecurityConfig(CustomAuthenticationProvider customAuthenticationProvider) {        this.customAuthenticationProvider = customAuthenticationProvider;    }     @Override    protected void configure(AuthenticationManagerBuilder auth) {        auth.authenticationProvider(customAuthenticationProvider);    }     @Bean    public JwtTokenUtil jwtTokenUtil(){        return new JwtTokenUtil();    }     @Bean    public CorsFilter corsFilter() throws Exception {        return new CorsFilter();    }     @Bean    public JwtAuthenticationTokenFilter authenticationTokenFilterBean() {        return new JwtAuthenticationTokenFilter();    }     @Override    protected void configure(HttpSecurity httpSecurity) throws Exception {        httpSecurity                // 由于使用的是JWT，我们这里不需要csrf,不用担心csrf攻击                .csrf().disable()                // 基于token，所以不需要session                .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS).and()                 .authorizeRequests()                    //.antMatchers(HttpMethod.OPTIONS, "/**").permitAll()                     // 允许对于网站静态资源的无授权访问                    .antMatchers(                        HttpMethod.GET,                        "/",                        "/*.html",                        "/favicon.ico",                        "/**/*.html",                        "/**/*.css",                        "/**/*.js",                        "/webjars/springfox-swagger-ui/images/**","/swagger-resources/configuration/*","/swagger-resources",//swagger请求                        "/v2/api-docs"                    ).permitAll()                    // 对于获取token的rest api要允许匿名访问                    .antMatchers("/pmdbservice/auth/**","/pmdbservice/keywords/export3").permitAll()                    .antMatchers(HttpMethod.OPTIONS,"/**").permitAll()                    // 除上面外的所有请求全部需要鉴权认证。 .and() 相当于标示一个标签的结束，之前相当于都是一个标签项下的内容                .anyRequest().authenticated().and()                .addFilterBefore(corsFilter(), UsernamePasswordAuthenticationFilter.class)                .addFilterBefore(authenticationTokenFilterBean(), UsernamePasswordAuthenticationFilter.class);         // 禁用缓存        httpSecurity.headers().cacheControl();    } }

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