SpringBoot 全局异常捕获不到Filter中的异常

场景：

SpringBoot项目中，定义了全局异常捕获类，但是当在Filter校验Token失败后抛出异常时，无法捕获异常。

原因分析：

SpringBoot中，通过@[email protected]实现的全局异常捕获类，只捕获Controller层的异常，众所周知，Filter是在Controller层之前。

解决方案：

1.新增异常过滤器Filter，将异常转移到Controller

import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import javax.servlet.*;
import java.io.IOException;

/**
 * <p> @Title ExceptionFilter
 * <p> @Description 异常过滤器
 *
 * @author ACGkaka
 * @date 2021/6/17 9:53
 */
@Slf4j
@Component
public class ExceptionFilter implements Filter {

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        try {
            chain.doFilter(request, response);
        } catch (Exception e) {
            // 异常捕获，发送到error controller
            request.setAttribute("filter.error", e);
            //将异常分发到/error/exthrow控制器
            request.getRequestDispatcher("/error/exthrow").forward(request, response);
        }
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

    @Override
    public void destroy() {

    }
}

2.实例化ExceptionFilter

import cn.agile.stats.common.filter.AccessTokenFilter;
import cn.agile.stats.common.filter.ExceptionFilter;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * <p> @Title FilterConfig
 * <p> @Description 过滤器配置类
 *
 * @author ACGkaka
 * @date 2021/6/16 18:08
 */
@Configuration
public class FilterConfig {
    @Bean
    public FilterRegistrationBean exceptionFilterRegistration() {
        FilterRegistrationBean registration = new FilterRegistrationBean();
        registration.setFilter(new ExceptionFilter());
        registration.setName("ExceptionFilter");
        //此处尽量小，要比其他Filter靠前
        registration.setOrder(-1);
        return registration;
    }
}

3.实现Controller接收过过滤器发来的异常

@RestController
public class ErrorController {
    /**
     * 重新抛出异常
     */
    @RequestMapping("/error/exthrow")
    public void rethrow(HttpServletRequest request) {
        throw ((Exception) request.getAttribute("filter.error"));
    }
}

4.用全局异常处理器接收异常

import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.bind.annotation.RestControllerAdvice;

import javax.servlet.http.HttpServletRequest;
import java.util.HashMap;
import java.util.Map;

/**
 * <p> @Title GlobalExceptionHandler
 * <p> @Description 全局异常捕获
 *
 * @author ACGkaka
 * @date 2021/4/30 17:27
 */
@RestControllerAdvice(annotations = RestController.class)
public class GlobalExceptionHandler {

    /**
     * 捕获自定义异常，返回json信息
     * @param req HttpServletRequest
     * @param exception 自定义异常
     * @return 异常信息
     */
    @ExceptionHandler({RuntimeException.class})
    @ResponseBody
    public Map<String, Object> errorHandle(HttpServletRequest req, RuntimeException exception) {
        return initResultMap(req.getRequestURI(), 500, exception);
    }

    /**
     * 捕获系统异常
     *
     * @param exception 系统异常
     * @return 异常信息
     */
    @ExceptionHandler({Exception.class})
    @ResponseBody
    public Map<String, Object> errorHandle(HttpServletRequest req, Exception exception) {
        exception.printStackTrace();
        return initResultMap(req.getRequestURI(), 500, exception);
    }

    /**
     * 初始化返回Map
     * 
     * @param url 请求地址
     * @param code 状态码
     * @param exception 异常
     * @return Map
     */
    private Map<String, Object> initResultMap(String url, int code, Exception exception) {
        Map<String, Object> map = new HashMap<>();
        map.put("code", code);
        map.put("exception",exception);
        map.put("message", exception.getMessage());
        map.put("url", url);
        return map;
    }
}

整理完毕，完结撒花~

参考文章：https://www.icode9.com/content-4-842478.html