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springboot跨域問(wèn)題解決方案

更新時(shí)間：2020年01月03日 10:45:28 作者：聞窗

這篇文章主要介紹了springboot跨域問(wèn)題解決方案,文中通過(guò)示例代碼介紹的非常詳細(xì)，對(duì)大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價(jià)值,需要的朋友可以參考下

springboot中的跨域問(wèn)題，如果不注意的話，容易造成錯(cuò)誤，本次springboot版本為2.13

前端錯(cuò)誤信息：

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.

第一種：是在每個(gè)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，比如這樣，這樣針對(duì)具體的方法

 @CrossOrigin
  @ApiOperation(value = "用戶登錄",notes = "")
  @PostMapping("/loginOn")
  public ResponseMessage loginOn(@RequestBody @Valid UserReq userReq){

每一個(gè)Controller這樣寫也是很麻煩。

第二種：是實(shí)現(xiàn)WebMvcConfigurer接口，在接口中進(jìn)行跨域支持

以前可以繼承WebMvcConfigurerAdapter，springboot2.x版本已經(jīng)將其@Deprecated

我們直接實(shí)現(xiàn)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);
  }

但使用這種方法，我今天遇到一個(gè)坑，我準(zhǔn)備在攔截器里面對(duì)用戶的請(qǐng)求進(jìn)行攔截

@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){
　　　　　　　　//自定義的異常類，這里拋出異常，交給全局異常捕捉類處理
      throw new ServiceException("沒(méi)有權(quán)限，請(qǐng)先登錄!");
    }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 {

  }
}

全局異常捕捉類：

@RestControllerAdvice
public class GlobleExceptionHandler {
  @ExceptionHandler(value = ServiceException.class)
  public ResponseMessage caughtException(ServiceException e){

    return new ResponseMessage(e.getMsg());
  }
}

ResponseMessage 是自定義的統(tǒng)一的響應(yīng)信息類：

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);
  }
}

通過(guò)這樣的處理發(fā)現(xiàn)，前端一直報(bào)跨域異常問(wèn)題，這時(shí)候有了第三種方法

第三種：使用CorsFilter過(guò)濾器：

寫一個(gè)MyCorsConfig 配置類

@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));
    //設(shè)置過(guò)濾器的順序
    bean.setOrder(0);
    return new CorsFilter(source);
  }
}

最終解決本次demo的跨域問(wèn)題。

以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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