Springboot跨域問題三種解決方案

1.自定義跨域過濾器

編寫過濾器

public class MyCorsFilter implements Filter {

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletResponse res = (HttpServletResponse) response;
        
 
//是否允許後續請求攜帶認證資訊（cookies）,該值只能是true,否則不返回
        res.addHeader("Access-Control-Allow-Credentials", "true");
        //指定允許其他域名訪問
        // 一般用法（*，指定域，動態設定），3是因為*不允許攜帶認證頭和cookies
        res.addHeader("Access-Control-Allow-Origin", "*");
        //該次請求的請求方式
        res.addHeader("Access-Control-Allow-Methods", "GET, POST, DELETE, PUT");
        
 
//該次請求的自定義請求頭欄位
        res.addHeader("Access-Control-Allow-Headers", "Content-Type,X-CAF-Authorization-Token,sessionToken,X-TOKEN");
        if (((HttpServletRequest) request).getMethod().equals("OPTIONS")) {
            response.getWriter().println("ok");
            return;
        }
        chain.doFilter(request, response);
    }

    @Override
    
 
public void destroy() {
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }
    
}

註冊過濾器

/**
     * 註冊自定義跨域過濾器
     */
    @Bean
    public FilterRegistrationBean registerFilter(){
        FilterRegistrationBean bean = new FilterRegistrationBean();
        bean.addUrlPatterns("/*");
        bean.setFilter(new MyCorsFilter());
        return bean;
    }

2.針對單個介面,使用註解@CrossOrigin

@CrossOrigin
@RequestMapping("customAnalysisConfig")
@RestController
public class CustomAnalysisConfigController {
}

3.基於WebMvcConfigurerAdapter配置加入Cors的跨域

@Configuration
public class CorsConfig implements WebMvcConfigurer {

    /**
     * 跨域支援
     */
    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
                .allowedOrigins("*")
                .allowCredentials(true)
                .allowedMethods("GET", "POST", "DELETE", "PUT")
                .maxAge(3600);
    }
}