SpringBoot开发（4）——统一处理异常

package com.cxsbg.exception;

import com.cxsbg.domain.ResponseResult;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;

@ControllerAdvice //注入，处理异常
public class MyControllerAdvice {
    //自定义方法处理异常
    @ExceptionHandler(RuntimeException.class)//指定处理哪类异常
    @ResponseBody //返回的结果放回相应体中，所以要加此注解
    public ResponseResult handlerException(Exception e){
        //获得异常消息
        String message = e.getMessage();
        //将异常消息存入ResponseResult的msg属性中
        ResponseResult responseResult = new ResponseResult(300, message);
        //返回ResponseResult，到时候能转换成json存入响应体中
        return responseResult;
    }
}

package com.cxsbg.interceptor;

import com.cxsbg.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@Component //注入
//实现登录拦截器，验证token是否有效，如果有效就放行
public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //获取请求头中的token
        String token = request.getHeader("token");
        //判断token是否为空，如果为空，说明未登录，不放行
        if(!StringUtils.hasText(token)){
            //发送错误码
            //response.sendError(HttpServletResponse.SC_UNAUTHORIZED);
            throw new RuntimeException("未登录");
            //return false;
        }
        //判断token是否有效，如果无效，不放行
        try {
            Claims claims = JwtUtil.parseJWT(token);
            String subject = claims.getSubject();
            System.out.println(subject);
        }catch (Exception e){
            //发送错误码
//            response.sendError(HttpServletResponse.SC_UNAUTHORIZED);
//            return false;
            throw new RuntimeException("未登录");
        }
        return true;
    }
}