Springboot如何实现前后端分离项目配置跨域

发布时间：2020-08-11 09:41:58 作者：小新
来源：亿速云阅读：221

小编给大家分享一下Springboot如何实现前后端分离项目配置跨域，希望大家阅读完这篇文章后大所收获，下面让我们一起去探讨吧！

项目登录流程如下

用户进入前端登录界面，输入账号密码等，输入完成之后前端发送请求到后端(拦截器不会拦截登录请求)，后端验证账号密码等成功之后生成Token并存储到数据库，数据库中包含该Token过期时间，然后返回生成的Token到前端。

前端收到Token，表示登录成功，把这个Token存储本地。然后跳转到用户中心页面，用户中心页面在ajax的请求头中带上Token，跟随请求用户数据接口一起带到后端。

后端通过拦截器拦截到这个请求，去判断这个Token是否有效，有效就放过去做他该做的事情，无效就抛出异常。

跨域配置

先说一下这个前后分离的项目，已经配置过跨域这些问题。我这里后端WebMvcConfig配置的方式如下：

import com.zdyl.devicemanagement.interceptor.AccessInterceptor;
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;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import javax.annotation.Resource;
import java.util.ArrayList;
import java.util.List;

@Configuration
public class WebMvcConfig implements WebMvcConfigurer {
  @Resource
  private WebServerConfig webServerConfig;

  @Bean
  public AccessInterceptor getAccessInterceptor() {
    return new AccessInterceptor();
  }

  @Override
  public void addInterceptors(InterceptorRegistry registry) {
    List<String> excludeUrl = new ArrayList<>();
    excludeUrl.add("/error");
    excludeUrl.add("/v1/zdyl/downloadFile");
    excludeUrl.add("/v1/zdyl/lcoStation/qrcode/**");
    excludeUrl.add("/devicemanagement/images/**/*");
    excludeUrl.add("/upgrade/**");
    excludeUrl.add("/v1/zdyl/login/**");
    excludeUrl.add("/NewsImage/**");
    excludeUrl.add("/v1/zdyl/equipment/alarm/toExcel/test");
    excludeUrl.add("/v1/zdyl/deviceMonitoring/get/alarm/toExcel/**");

    registry.addInterceptor(getAccessInterceptor()).addPathPatterns("/**")
        .excludePathPatterns(excludeUrl);
  }

  @Override
  public void addResourceHandlers(ResourceHandlerRegistry registry) {
    List<String> locations = new ArrayList<String>();
    locations.add("classpath:/META-INF/resources/");
    locations.add("classpath:/resources/");
    locations.add("classpath:/public/");
    locations.add("file:" + webServerConfig.getUploadFileLocation());
    locations.add("file:" + webServerConfig.getPicpath());
    locations.add("file:" + webServerConfig.getProjectsource());

    String[] myArray = new String[locations.size()];
    registry.addResourceHandler("/**").addResourceLocations(locations.toArray(myArray));
  }

  @Bean
  public CorsFilter corsFilter() {
    UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
    CorsConfiguration config = new CorsConfiguration();
    config.setAllowCredentials(true);
    config.addAllowedOrigin("*");
    config.addAllowedHeader("*");
    config.addAllowedMethod("*");
    source.registerCorsConfiguration("/**", config);
    return new CorsFilter(source);
  }

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

前端每次发送请求也都有在ajax里面设置xhrFields:{withCredentials: true}属性。

拦截器代码

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
import com.zdyl.devicemanagement.common.exception.RRException;
import com.zdyl.devicemanagement.common.utils.AccountNumber;
import com.zdyl.devicemanagement.common.utils.RedisSavePrefix;
import com.zdyl.devicemanagement.common.utils.RedisUtils;
import com.zdyl.devicemanagement.common.utils.SystemConstants;
import com.zdyl.devicemanagement.entity.LcoUsers;
import com.zdyl.devicemanagement.entity.Login;
import com.zdyl.devicemanagement.service.LcoUsersService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Date;

@Slf4j
public class AccessInterceptor extends HandlerInterceptorAdapter {

  @Resource
  private RedisUtils redisUtils;
  @Resource
  private LcoUsersService lcoUsersService;

  @Override
  public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
    log.info("------------------------AccessInterceptor-------------------------");
    if (request.getMethod().equals(RequestMethod.OPTIONS.name())) {
      return super.preHandle(request, response, handler);
    }
    //获取请求token，如果token不存在，直接返回401
    String token = getRequestToken(request);
    String loginId = getRequestloginId(request);
    if (StringUtils.isEmpty(token)) {
      throw new RRException("token为空", 401);
    }
    if (StringUtils.isEmpty(loginId)) {
      throw new RRException("loginId为空", 401);
    }
    Object users = redisUtils.getObject(redisUtils.getKey(RedisSavePrefix.Login, loginId), AccountNumber.loginDataBase);
    if (users == null) {
      throw new RRException("用户尚未登录", 401);
    }
    Login loginUser = JSONObject.parseObject(JSON.toJSONString(users), Login.class);
    if (!loginUser.getToken().equals(token)) {
      throw new RRException("token不匹配", 401);
    }
    Date loginTime = loginUser.getLoginTime();
    long exitTime = loginTime.getTime() / 1000 + 7200;
    long time = new Date().getTime();
    long nowTime = new Date().getTime() / 1000;
    if (nowTime > exitTime) {
      throw new RRException("token已过期！", 401);
    }
    QueryWrapper<LcoUsers> lcoUsersQueryWrapper = new QueryWrapper<>();
    lcoUsersQueryWrapper.eq("phone", loginUser.getLoginID());
    LcoUsers lcoUsers = lcoUsersService.getOne(lcoUsersQueryWrapper);
    request.setAttribute(SystemConstants.CURRENTUSER, lcoUsers);
    return super.preHandle(request, response, handler);
  }

  /**
   * 获取请求的token
   */
  private String getRequestToken(HttpServletRequest httpRequest) {
    //从header中获取token
    String host = httpRequest.getHeader("token");

    //如果header中不存在token，则从参数中获取token
    if (StringUtils.isEmpty(host)) {
      host = httpRequest.getParameter("token");
    }
//    if (StringUtils.isEmpty(host)) {
//      Cookie[] cks = httpRequest.getCookies();
//      for (Cookie cookie : cks) {
//        if (cookie.getName().equals("yzjjwt")) {
//          host = cookie.getValue();
//          return host;
//        }
//      }
//    }
    return host;
  }

  /**
   * 获取请求的loginId
   */
  private String getRequestloginId(HttpServletRequest httpRequest) {
    //从header中获取token
    String loginId = httpRequest.getHeader("loginId");

    //如果header中不存在token，则从参数中获取token
    if (StringUtils.isEmpty(loginId)) {
      loginId = httpRequest.getParameter("loginId");
    }
//    if (StringUtils.isEmpty(loginId)) {
//      Cookie[] cks = httpRequest.getCookies();
//      for (Cookie cookie : cks) {
//        if (cookie.getName().equals("yzjjwt")) {
//          loginId = cookie.getValue();
//          return loginId;
//        }
//      }
//    }
    return loginId;
  }

/**
 * 对跨域提供支持
 */
protected boolean addCors(ServletRequest request, ServletResponse response) throws Exception {
  HttpServletRequest httpServletRequest = (HttpServletRequest) request;
  HttpServletResponse httpServletResponse = (HttpServletResponse) response;
  httpServletResponse.setHeader("Access-control-Allow-Origin", httpServletRequest.getHeader("Origin"));
  httpServletResponse.setHeader("Access-Control-Allow-Methods", "GET,POST,OPTIONS,PUT,DELETE");
  httpServletResponse.setHeader("Access-Control-Allow-Headers", httpServletRequest.getHeader("Access-Control-Request-Headers"));
  // 跨域时会首先发送一个option请求，这里我们给option请求直接返回正常状态
  if (httpServletRequest.getMethod().equals(RequestMethod.OPTIONS.name())) {
    httpServletResponse.setStatus(HttpStatus.OK.value());
    return false;
  }
  return super.preHandle(request, response);
}


}

自定义异常RRException代码

/**
 * 自定义异常
 */
public class RRException extends RuntimeException {
  private static final long serialVersionUID = 1L;

  private String message;
  private String code = "INVALID";
  private int status = 0;

  public RRException(String msg) {
    super(msg);
    this.message = msg;
  }

  public RRException(String msg, Throwable e) {
    super(msg, e);
    this.message = msg;
  }

  public RRException(String msg, String code) {
    super(msg);
    this.message = msg;
    this.code = code;
  }
  public RRException(String msg, int status) {
    super(msg);
    this.message = msg;
    this.status = status;
  }

  public RRException(String msg, String code, Throwable e) {
    super(msg, e);
    this.message = msg;
    this.code = code;
  }

  public String getMsg() {
    return message;
  }

  public void setMsg(String msg) {
    this.message = msg;
  }

  public String getCode() {
    return code;
  }

  public void setCode(String code) {
    this.code = code;
  }

  public int getStatus() {
    return status;
  }

  public void setStatus(int status) {
    this.status = status;
  }
}

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Springboot如何实现前后端分离项目配置跨域

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