这篇文章主要介绍了springboot跨域问题解决方案,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下
springboot中的跨域问题，如果不注意的话，容易造成错误，本次springboot版本为2.13
前端错误信息：
Access to XMLHttpRequest at 'http://localhost:8080/user/loginOn' from origin 'http://localhost:8082' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.
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：
@Configurationpublic 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
@Componentpublic 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：
@RestControllerAdvicepublic 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
@Datapublic 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
@Configurationpublic 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); }}
最终解决本次demo的跨域问题。
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本文标题: springboot跨域问题解决方案
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