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;@Configurationpublic 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;@Slf4jpublic 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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