Springboot 自定义处理统一异常

一、创建返回对象工具类

package com.yxh.demo.demo.util;

import com.yxh.demo.demo.model.ReturnModel;

public class ReturnModelUtil {
    /**
     * 请求成功返回参数
     * @param object
     * @return
     */
    public static ReturnModel success(Object object){
        //此处写死，正常业务到时可以设置是否有无分页返回
        return new ReturnModel(200,"成功",object);
    }

    /**
     * 请求失败返回参数
     * @param code
     * @param msg
     * @return
     */
    public static ReturnModel fail(int code,String msg){
        return new ReturnModel(code,msg,null);
    }

}

二、创建返回对象

package com.yxh.demo.demo.model;

public class ReturnModel<T> {
    public int code;
    public String msg;
    public T data;

    public ReturnModel(int code, String msg, T data) {
        this.code = code;
        this.msg = msg;
        this.data = data;
    }
}

三、自定义异常类

package com.yxh.demo.demo.exception;

public class MyException extends RuntimeException {
    private int  code;
    private String msg;

    public MyException(int code, String msg) {
        this.code = code;
        this.msg = msg;
    }

    public MyException(String message, int code, String msg) {
        super(message);
        this.code = code;
        this.msg = msg;
    }

    public MyException(String message, Throwable cause, int code, String msg) {
        super(message, cause);
        this.code = code;
        this.msg = msg;
    }

    public MyException(Throwable cause, int code, String msg) {
        super(cause);
        this.code = code;
        this.msg = msg;
    }

    public MyException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace, int code, String msg) {
        super(message, cause, enableSuppression, writableStackTrace);
        this.code = code;
        this.msg = msg;
    }

    public int getCode() {
        return code;
    }

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

    public String getMsg() {
        return msg;
    }

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

四、设置请求拦截器抛异常

package com.yxh.demo.demo.inter;

import com.yxh.demo.demo.exception.MyException;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

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

public class ReqInterceptor extends HandlerInterceptorAdapter {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("Interceptor preHandler method is running !");
        if(true){
            throw new MyException(1000,"登陆异常");
        }
        request.setAttribute("token","123456");
        return super.preHandle(request, response, handler);
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("Interceptor postHandler method is running !");
        super.postHandle(request, response, handler, modelAndView);
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("Interceptor afterCompletion method is running !");
        super.afterCompletion(request, response, handler, ex);
    }

    @Override
    public void afterConcurrentHandlingStarted(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("Interceptor afterConcurrentHandlingStarted method is running !");
        super.afterConcurrentHandlingStarted(request, response, handler);
    }

}

这是一个请求拦截器，拦截指定的资源，我是设置拦截/api/下的所有资源，
访问http://localhost:8080/api/test
游览器看到的结果

下一篇讲解Springboot自定义拦截器