拦截器：
package com.xmj.interceptor;
import com.xmj.enums.BizCodeEnum;
import com.xmj.model.LoginUser;
import com.xmj.utils.CommonUtil;
import com.xmj.utils.JWTUtil;
import com.xmj.utils.JsonData;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@Slf4j
public class LoginInterceptor implements HandlerInterceptor {
/**
* 进入方法之前
* @param request
* @param response
* @param handler
* @return
* @throws Exception
*/
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
// 头部获取
String accessToken = request.getHeader("token");
//头部获取不到就url中获取
if (accessToken == null) {
accessToken = request.getParameter("token");
}
//不为空则解密
if (StringUtils.isNotBlank(accessToken)) {
Claims claims = JWTUtil.checkJWT(accessToken);
if (claims == null) {
//未登录,返回未登录的json数据给前端
CommonUtil.sendJsonMessage(response, JsonData.buildResult(BizCodeEnum.ACCOUNT_UNLOGIN));
return false;
}
Long userId = Long.valueOf(claims.get("id").toString());
String headImg = (String)claims.get("head_img");
String name = (String)claims.get("name");
String mail = (String)claims.get("mail");
LoginUser loginUser = new LoginUser();
loginUser.setHeadImg(headImg);
loginUser.setId(userId);
loginUser.setMail(mail);
loginUser.setName(name);
return true;
}
CommonUtil.sendJsonMessage(response, JsonData.buildResult(BizCodeEnum.ACCOUNT_UNLOGIN));
return false;
}
@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 {
}
}工具类：
CommonUtil
/**
* 响应json数据给前端
*
* @param response
* @param obj
*/
public static void sendJsonMessage(HttpServletResponse response, Object obj) {
//Spring boot 默认/* ObjectMapper objectMapper = new ObjectMapper();
// response的头信息
response.setContentType("application/json;charset=utf-8");
try (PrintWriter writer = response.getWriter();){
writer.print(objectMapper.writeValueAsString(obj));
response.flushBuffer();
} catch (IOException e) {
log.warn("响应json数据给前端异常:{}",e);
}
}
