springboot中怎么解决跨域问题，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
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第一种：是在每个Controller里，加上注解：@CrossOrigin
import javax.validation.Valid;
@CrossOrigin
@RestController
@RequestMapping("/user")
public class UserController{也可以在方法上加上，比如这样，这样针对具体的方法
@CrossOrigin
@ApiOperation(value = "用户登录",notes = "")
@PostMapping("/loginOn")
public ResponseMessage loginOn(@RequestBody @Valid UserReq userReq){每一个Controller这样写也是很麻烦。
第二种：是实现WebMvcConfigurer接口，在接口中进行跨域支持
以前可以继承WebMvcConfigurerAdapter，springboot2.x版本已经将其@Deprecated
我们直接实现接口：
@Configuration
public class WebConfig implements WebMvcConfigurer {
/**
* 跨域支持
* @param registry
*/
@Override
public void addCorsMappings(CorsRegistry registry) {
registry.addMapping("/**")
.allowedOrigins("*")
.allowCredentials(true)
.allowedMethods("GET", "POST", "DELETE", "PUT")
.maxAge(3600 * 24);
}但使用这种方法，我今天遇到一个坑，我准备在拦截器里面对用户的请求进行拦截
@Component
public class RequestInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
Object loginUser = request.getSession().getAttribute("token");
if(loginUser == null){
//自定义的异常类，这里抛出异常，交给全局异常捕捉类处理
throw new ServiceException("没有权限，请先登录!");
}else{
return true;
}
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
}
}全局异常捕捉类：
@RestControllerAdvice
public class GlobleExceptionHandler {
@ExceptionHandler(value = ServiceException.class)
public ResponseMessage caughtException(ServiceException e){
return new ResponseMessage(e.getMsg());
}
}ResponseMessage 是自定义的统一的响应信息类：
ResponseMessage
@Data
public class ResponseMessage {
private Integer Code;
private String msg;
private Integer count;
private Object data;
public ResponseMessage(Object data) {
this.data = data;
}
public ResponseMessage(String msg) {
this.msg = msg;
}
public ResponseMessage(Integer code, String msg) {
Code = code;
this.msg = msg;
}
public ResponseMessage(Integer code, String msg, Integer count) {
Code = code;
this.msg = msg;
this.count = count;
}
public ResponseMessage(Integer code, String msg, Integer count, Object data) {
Code = code;
this.msg = msg;
this.count = count;
this.data = data;
}
public static ResponseMessage success(String msg){
return new ResponseMessage(200,msg);
}
public static ResponseMessage fail(Integer code,String msg){
return new ResponseMessage(code,msg);
}
}通过这样的处理发现，前端一直报跨域异常问题，这时候有了第三种方法
第三种：使用CorsFilter过滤器：
写一个MyCorsConfig 配置类
@Configuration
public class MyCorsConfig {
@Bean
public CorsFilter corsFilter() {
CorsConfiguration corsConfiguration = new CorsConfiguration();
corsConfiguration.addAllowedOrigin("*");
corsConfiguration.addAllowedHeader("*");
corsConfiguration.addAllowedMethod("*");
corsConfiguration.setAllowCredentials(true);
corsConfiguration.setMaxAge(3600L);
UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
source.registerCorsConfiguration("/**", corsConfiguration);
FilterRegistrationBean bean = new FilterRegistrationBean(new CorsFilter(source));
//设置过滤器的顺序
bean.setOrder(0);
return new CorsFilter(source);
}
}看完上述内容，你们掌握springboot中怎么解决跨域问题的方法了吗？如果还想学到更多技能或想了解更多相关内容，欢迎关注创新互联行业资讯频道，感谢各位的阅读！
