Springboot 解决跨域的四种姿势

> 本文由 https://juejin.cn/post/7000578331485667359

实现 WebMvcConfigurer#addCorsMappings 的方法

```
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class CorsConfig implements WebMvcConfigurer {

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

```

#### 姿势二

> 重新注入 CorsFilter

```
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;

/**
 * 解决跨域
 */
@Configuration
public class CorsFilterConfig {

/**
     * 开启跨域访问拦截器
     *
     * @date 2021/4/29 9:50
     */
    @Bean
    public CorsFilter corsFilter() {
        //创建CorsConfiguration对象后添加配置
        CorsConfiguration corsConfiguration = new CorsConfiguration();
        //设置放行哪些原始域
        corsConfiguration.addAllowedOrigin("*");
        //放行哪些原始请求头部信息
        corsConfiguration.addAllowedHeader("*");
        //放行哪些请求方式
        corsConfiguration.addAllowedMethod("*");

UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        //2. 添加映射路径
        source.registerCorsConfiguration("/**", corsConfiguration);
        return new CorsFilter(source);
    }
}

```

#### 姿势三

> 创建一个 filter 解决跨域

```
@Slf4j
@Component
@WebFilter(urlPatterns = { "/*" }, filterName = "headerFilter")
public class HeaderFilter implements Filter {
    @Override
    public void doFilter(ServletRequest request, ServletResponse resp, FilterChain chain) throws IOException, ServletException {
        HttpServletResponse response = (HttpServletResponse) resp;
        //解决跨域访问报错
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("Access-Control-Allow-Methods", "POST, PUT, GET, OPTIONS, DELETE");
        //设置过期时间
        response.setHeader("Access-Control-Max-Age", "3600");
        response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, client_id, uuid, Authorization");
        // 支持HTTP 1.1.
        response.setHeader("Cache-Control", "no-cache, no-store, must-revalidate");
        // 支持HTTP 1.0. response.setHeader("Expires", "0");
        response.setHeader("Pragma", "no-cache");
        // 编码
        response.setCharacterEncoding("UTF-8");
        chain.doFilter(request, resp);
    }

@Override
    public void init(FilterConfig filterConfig) {
        log.info("跨域过滤器启动");
    }

@Override
    public void destroy() {
        log.info("跨域过滤器销毁");
    }
}

```

#### 姿势四

> 使用 CrossOrigin 注解

可以使用在单个方法上也可以使用在类上

```
Target({ElementType.TYPE, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface CrossOrigin {

/** @deprecated as of Spring 5.0, in favor of {@link CorsConfiguration#applyPermitDefaultValues} */
	@Deprecated
	String[] DEFAULT_ORIGINS = {"*"};

/** @deprecated as of Spring 5.0, in favor of {@link CorsConfiguration#applyPermitDefaultValues} */
	@Deprecated
	String[] DEFAULT_ALLOWED_HEADERS = {"*"};

/** @deprecated as of Spring 5.0, in favor of {@link CorsConfiguration#applyPermitDefaultValues} */
	@Deprecated
	boolean DEFAULT_ALLOW_CREDENTIALS = false;

/** @deprecated as of Spring 5.0, in favor of {@link CorsConfiguration#applyPermitDefaultValues} */
	@Deprecated
	long DEFAULT_MAX_AGE = 1800;

/**
	 * Alias for {@link #origins}.
	 */
	@AliasFor("origins")
	String[] value() default {};

/**
	 * A list of origins for which cross-origin requests are allowed. Please,
	 * see {@link CorsConfiguration#setAllowedOrigins(List)} for details.
	 * By default all origins are allowed unless {@code originPatterns} is
	 * also set in which case {@code originPatterns} is used instead.
	 */
	@AliasFor("value")
	String[] origins() default {};

/**
	 * Alternative to {@link #origins()} that supports origins declared via
	 * wildcard patterns. Please, see
	 * @link CorsConfiguration#setAllowedOriginPatterns(List)} for details.
	 * By default this is not set.
	 * @since 5.3
	 */
	String[] originPatterns() default {};

/**
	 * The list of request headers that are permitted in actual requests,
	 * possibly {@code "*"} to allow all headers.
	 * Allowed headers are listed in the {@code Access-Control-Allow-Headers}
	 * response header of preflight requests.
	 * A header name is not required to be listed if it is one of:
	 * {@code Cache-Control}, {@code Content-Language}, {@code Expires},
	 * {@code Last-Modified}, or {@code Pragma} as per the CORS spec.
	 * By default all requested headers are allowed.
	 */
	String[] allowedHeaders() default {};

/**
	 * The List of response headers that the user-agent will allow the client
	 * to access on an actual response, other than "simple" headers, i.e.
	 * {@code Cache-Control}, {@code Content-Language}, {@code Content-Type},
	 * {@code Expires}, {@code Last-Modified}, or {@code Pragma},
	 * Exposed headers are listed in the {@code Access-Control-Expose-Headers}
	 * response header of actual CORS requests.
	 * The special value {@code "*"} allows all headers to be exposed for
	 * non-credentialed requests.
	 * By default no headers are listed as exposed.
	 */
	String[] exposedHeaders() default {};

/**
	 * The list of supported HTTP request methods.
	 * By default the supported methods are the same as the ones to which a
	 * controller method is mapped.
	 */
	RequestMethod[] methods() default {};

/**
	 * Whether the browser should send credentials, such as cookies along with
	 * cross domain requests, to the annotated endpoint. The configured value is
	 * set on the {@code Access-Control-Allow-Credentials} response header of
	 * preflight requests.
	 * NOTE: Be aware that this option establishes a high
	 * level of trust with the configured domains and also increases the surface
	 * attack of the web application by exposing sensitive user-specific
	 * information such as cookies and CSRF tokens.
	 * By default this is not set in which case the
	 * {@code Access-Control-Allow-Credentials} header is also not set and
	 * credentials are therefore not allowed.
	 */
	String allowCredentials() default "";

/**
	 * The maximum age (in seconds) of the cache duration for preflight responses.
	 * This property controls the value of the {@code Access-Control-Max-Age}
	 * response header of preflight requests.
	 * Setting this to a reasonable value can reduce the number of preflight
	 * request/response interactions required by the browser.
	 * A negative value means undefined.
	 * By default this is set to {@code 1800} seconds (30 minutes).
	 */
	long maxAge() default -1;

```

以上四种姿势都学会了么？学会了三连哦

Springboot 解决跨域的四种姿势

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