自定义Filter类中throw自定义异常，报错

相关截图：

Filter类：

public class UserFilter implements Filter {

    public static User user;

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

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws ServletException, IOException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response=(HttpServletResponse)servletResponse;
        response.setContentType("text/html;charset=UTF-8");
        String token = request.getHeader(Constant.JWT_TOKEN);
        if (StringUtils.isEmpty(token)) {
            response.getWriter().println("{\n"
                    + "    \"status\": 305,\n"
                    + "    \"msg\": \"LOGIN_NOT(用户未登录)\",\n"
                    + "    \"data\": null\n"
                    + "}");
            response.getWriter().flush();
            response.getWriter().close();
            return;
        }
        Algorithm algorithm = Algorithm.HMAC256(Constant.JWT_KEY);
        JWTVerifier build = JWT.require(algorithm).build();
        try {
            DecodedJWT verify = build.verify(token);
            user=new User();
            user.setUsername(verify.getClaim(Constant.USER_NAME).asString());
            user.setId(verify.getClaim(Constant.USER_ID).asInt());
        } catch (TokenExpiredException e) {
                throw new UserException(EnumUtils.JWT_TOKEN_EXPIRED);//token过期.
        }catch (JWTDecodeException e) {
                throw new UserException(EnumUtils.JWT_DECODE_EXPIRED);//解析失败
        }

        if (user == null) {
            response.getWriter().println("{\n"
                    + "    \"status\": 305,\n"
                    + "    \"msg\": \"LOGIN_NOT(用户未登录)\",\n"
                    + "    \"data\": null\n"
                    + "}");
            response.getWriter().flush();
            response.getWriter().close();
            return;
        }
        filterChain.doFilter(servletRequest,servletResponse);
    }

    @Override
    public void destroy() {

    }
}

自定义异常类：

package com.example.bbs.exception;

import com.example.bbs.utils.EnumUtils;

import javax.annotation.Resource;

public class UserException extends Exception {
    private final Integer code;
    private final String message;

    public UserException(EnumUtils exceptionEnum) {
        this(exceptionEnum.getCode(),exceptionEnum.getMsg() );
    }

    public UserException(Integer code, String message) {
        this.code = code;
        this.message = message;
    }


    public Integer getCode() {
        return code;
    }

    public String getMessage() {
        return message;
    }

}

枚举类：

package com.example.bbs.utils;

import jdk.internal.org.objectweb.asm.tree.IincInsnNode;

public enum EnumUtils {
    SUCCESS(200,"成功"),
    CREATE_FAILED(300,"用户创建失败"),
    REGISTER_FAILED(301,"用户名重复"),
    USER_NULL(302,"用户名为空"),
    PASSWORD_NULL(303,"密码为空"),
    LOGIN_FAULT(304,"用户名或密码错误"),
    LOGIN_NOT(305,"用户未登录"),

    INSERT_FAULT(400,"插入失败"),
    UPDATE_FAULT(401,"更新失败"),
    DELETE_FAULT(402,"删除失败"),

    JWT_TOKEN_EXPIRED(500,"Token过期"),
    JWT_DECODE_EXPIRED(501,"解码失败"),

    SYSTEM_ERROR(1000,"系统错误");


    Integer code;
    String msg;

    EnumUtils(Integer code, String msg) {
        this.code = code;
        this.msg = msg;
    }

    public Integer getCode() {
        return code;
    }

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

    public String getMsg() {
        return msg;
    }

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

}