springboot+vue+mybatisplus项目实战-学生成绩管理系统09-摩杜云开发者社区

exception

bizException.java

package com.shrimpking.exception;

import com.shrimpking.enums.CodeEnum;
import lombok.Data;

/**
 * Created by IntelliJ IDEA.
 *
 * @Author : Shrimpking
 * @create 2023/11/4 21:58
 * 自定义异常
 */
@Data
public class BizException extends RuntimeException
{
    /**
     * 状态码
     */
    private Integer code;

    public BizException(String msg){
        super(msg);
    }

    public BizException(CodeEnum codeEnum){
        super(codeEnum.getMsg());
        this.code = codeEnum.getCode();
    }


}

interceptor

authorizationInterceptor.java

package com.shrimpking.interceptor;

import com.auth0.jwt.interfaces.DecodedJWT;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
import com.shrimpking.constants.MyConstants;
import com.shrimpking.context.UserContext;
import com.shrimpking.dto.UserDTO;
import com.shrimpking.enums.CodeEnum;
import com.shrimpking.res.Result;
import com.shrimpking.util.JwtUtils;
import com.shrimpking.util.ResponseUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.web.servlet.HandlerInterceptor;

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

/**
 * Created by IntelliJ IDEA.
 *
 * @Author : Shrimpking
 * @create 2023/11/4 22:20
 * 认证校验 拦截器
 *
 */
@Slf4j
public class AuthorizationInterceptor implements HandlerInterceptor
{
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception
    {
        //日志
        log.info("请求路径：{}",request.getServletPath());

        /*
        axios对非简单请求（比如：application/json）有时会
        通过options请求来判断服务器是否支持跨域
         */
        String method = request.getMethod();
        if(HttpMethod.OPTIONS.matches(method)){
            //去执行剩余的filter
            return true;
        }

        //获取token
        String token = request.getHeader(HttpHeaders.AUTHORIZATION);
        if(StringUtils.isBlank(token)){
            //头部为空时，从请求参数获取token
            token = request.getParameter(MyConstants.USER_TOKEN_KEY);
            if(StringUtils.isBlank(token)){
                //未登录，失败
                ResponseUtils.respAppJson(response,Result.failure(CodeEnum.AUTH_ERROR));
                return false;
            }
        }

        //校验token
        Result<DecodedJWT> verifyResult = JwtUtils.verifyToken(token);
        //校验失败，不通过
        if(verifyResult.isFailed()){
            ResponseUtils.respAppJson(response,Result.failure(CodeEnum.AUTH_ERROR));
            return false;
        }

        //解析,获取放入的对象
        UserDTO userDTO = JwtUtils.parse(verifyResult.getData(),UserDTO.class);
        //解析失败
        if(userDTO == null){
            ResponseUtils.respAppJson(response,Result.failure(CodeEnum.AUTH_ERROR));
            return false;
        }

        //放入threadLocal中，在线程的任何地方可以获取到，使用
        UserContext.set(userDTO);
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception
    {
        //线程中移除
        UserContext.remove();
    }
}

exceptionAdvice.java

package com.shrimpking.interceptor;

import com.shrimpking.enums.CodeEnum;
import com.shrimpking.exception.BizException;
import com.shrimpking.res.Result;
import org.springframework.dao.DuplicateKeyException;
import org.springframework.jdbc.BadSqlGrammarException;
import org.springframework.validation.BindException;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;

import java.util.List;
import java.util.stream.Collectors;

/**
 * Created by IntelliJ IDEA.
 *
 * @Author : Shrimpking
 * @create 2023/11/4 21:12
 * 异常统一处理类
 */
@RestControllerAdvice
public class ExceptionAdvice
{

    /**
     * 处理参数校验不通过的异常
     * 提交类型是application/json的 + 后台使用RequestBody接收的情况
     * @param e
     * @return
     */
    @ExceptionHandler(MethodArgumentNotValidException.class)
    public Result<String> handleException(MethodArgumentNotValidException e){
        //获取绑定的错误结果
        BindingResult bindingResult = e.getBindingResult();
        //获取到校验失败的字段的详情
        List<FieldError> fieldErrors = bindingResult.getFieldErrors();
        String errorMsg = spliceErrorMsg(fieldErrors);
        return Result.failure(errorMsg);
    }

    /**
     *处理绑定异常的
     * 表单提交时的，application/x-www-form-urlencoded
     * @param e
     * @return
     */
    @ExceptionHandler(BindException.class)
    public Result<String> handleException(BindException e){
        //获取绑定的错误结果
        BindingResult bindingResult = e.getBindingResult();
        //获取到校验失败的字段的详情
        List<FieldError> fieldErrors = bindingResult.getFieldErrors();
        String errorMsg = spliceErrorMsg(fieldErrors);
        return Result.failure(errorMsg);
    }

    /**
     * 处理非法参数的异常
     *
     * @param e
     * @return
     */
    @ExceptionHandler(IllegalArgumentException.class)
    public Result<String> handleException(IllegalArgumentException e){
        System.out.println(e.getMessage());
        return Result.failure(CodeEnum.PARAM_ERROR);
    }

    /**
     * 处理数据库的异常
     *
     * @param e
     * @return
     */
    @ExceptionHandler(BadSqlGrammarException.class)
    public Result<String> handleException(BadSqlGrammarException e){
        System.out.println(e.getMessage());
        return Result.failure(CodeEnum.DB_ERROR);
    }

    /**
     * 处理唯一约束的异常
     *
     * @param e
     * @return
     */
    @ExceptionHandler(DuplicateKeyException.class)
    public Result<String> handleException(DuplicateKeyException e){
        System.out.println(e.getMessage());
        return Result.failure(CodeEnum.DUPLICATE_KEY_ERROR);
    }

    /**
     * 处理业务异常
     *
     * @param e
     * @return
     */
    @ExceptionHandler(BizException.class)
    public Result<String> handleException(BizException e){
        System.out.println(e.getMessage());
        return Result.failure(e.getCode(),e.getMessage());
    }

    /**
     * 处理其他异常
     *
     * @param e
     * @return
     */
    @ExceptionHandler(Exception.class)
    public Result<String> handleException(Exception e){
        System.out.println(e.getMessage());
        return Result.failure(CodeEnum.OTHER_ERROR);
    }


    /**
     * 抽取为方法
     * @param fieldErrors
     * @return
     */
    private String spliceErrorMsg(List<FieldError> fieldErrors){
        //循环列表，获取错误原因
        String errorMsg = fieldErrors.stream().map(field ->{
            //
            StringBuilder builder = new StringBuilder();
            //
            builder.append("属性：").append(field.getField())
                    .append("，传递的值：").append(field.getRejectedValue())
                    .append("，校验不通过的原因：").append(field.getDefaultMessage());
            return builder.toString();
            //多个字段属性使用分号隔开
        }).collect(Collectors.joining(";"));
        return errorMsg;
    }
}