SpringBoot的CORS

r囧r小猫 2022-05-20 01:46 119阅读 0赞

引自[我的gitbook][gitbook]：

CORS（跨域资源共享），这是由W3C提出的。

浏览器有同源策略， 源\[origin\]就是协议、域名和端口号,同时同源策略还对http方法有约束。

部分代码引自 [https://spring.io/blog/2015/06/08/cors-support-in-spring-framework][https_spring.io_blog_2015_06_08_cors-support-in-spring-framework]

1.控制器CORS配置：你可以@RequestMapping所拦截的方法上添加@CrossOrigin，默认情况下允许所有源和方法。

@RestController

@RequestMapping ( "/account" )

public  class  AccountController  \{

@CrossOrigin

@GetMapping ( "/\{id\}" )

public  Account  retrieve ( @PathVariable  Long id )  \{

// ...

@DeleteMapping ( "/\{id\}" )

public  void  remove ( @PathVariable  Long id )  \{

// ...

也可以为整个Controller启用CORS

@CrossOrigin ( origins  =  "http://domain2.com" ,  maxAge  =  3600 )

@RestController

@RequestMapping ( "/account" )

也可以组合配置

@CrossOrigin ( maxAge  =  3600 )

@RestController

@RequestMapping ( "/account" )

public  class  AccountController  \{

@CrossOrigin ( origins  =  "http://domain2.com" )

@GetMapping ( "/\{id\}" )

如果使用了Spring Security，就可以在Security级别启用CORS。[https://docs.spring.io/spring-security/site/docs/current/reference/html/cors.html][https_docs.spring.io_spring-security_site_docs_current_reference_html_cors.html]

以上是细粒度的CORS，也可以启用全局的CORS。

2.JavaConfig

为整个应用程序启用CORS

@Configuration

@EnableWebMvc

public  class  WebConfig  extends  WebMvcConfigurerAdapter  \{

@Override

public  void  addCorsMappings ( CorsRegistry registry )  \{

registry . addMapping ( "/\*\*" ) ;

如果是使用了SpringBoot，则可以这样使用

@Configuration

public  class  MyConfiguration  \{

@Bean

public  WebMvcConfigurer  corsConfigurer ( )  \{

return  new  WebMvcConfigurerAdapter ( )  \{

@Override

public  void  addCorsMappings ( CorsRegistry registry )  \{

registry . addMapping ( "/\*\*" ) ;

\} ;

也可以定制配置

@Override

public  void  addCorsMappings ( CorsRegistry registry )  \{

registry . addMapping ( "/api/\*\*" )

. allowedOrigins ( "http://domain2.com" )

. allowedMethods ( "PUT" ,  "DELETE" )

. allowedHeaders ( "header1" ,  "header2" ,  "header3" )

. exposedHeaders ( "header1" ,  "header2" )

. allowCredentials ( false ) . maxAge ( 3600 ) ;

3.基于过滤器的CORS Spring Framework还提供了[CorsFilter][]

@Configuration

public  class  MyConfiguration  \{

@Bean

public  FilterRegistrationBean  corsFilter ( )  \{

UrlBasedCorsConfigurationSource source  =  new  UrlBasedCorsConfigurationSource ( ) ;

CorsConfiguration config  =  new  CorsConfiguration ( ) ;

config . setAllowCredentials ( true ) ;

config . addAllowedOrigin ( "http://domain1.com" ) ;

config . addAllowedHeader ( "\*" ) ;

config . addAllowedMethod ( "\*" ) ;

source . registerCorsConfiguration ( "/\*\*" ,  config ) ;

FilterRegistrationBean bean  =  new  FilterRegistrationBean ( new  CorsFilter ( source ) ) ;

bean . setOrder ( 0 ) ;

return  bean ;

[gitbook]: https://effective-java.gitbook.io/springboot/web-development/cors
[https_spring.io_blog_2015_06_08_cors-support-in-spring-framework]: https://spring.io/blog/2015/06/08/cors-support-in-spring-framework
[https_docs.spring.io_spring-security_site_docs_current_reference_html_cors.html]: https://docs.spring.io/spring-security/site/docs/current/reference/html/cors.html
[CorsFilter]: https://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/web/filter/CorsFilter.html