springboot常用的異常處理推薦：

一.創建一個異常控制器，並實現ErrorController接口：

package com.example.demo.controller;

import org.springframework.boot.web.servlet.error.ErrorController;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class BaseErrorController implements ErrorController {

	@Override
	public String getErrorPath() {
		return "/error/error";
	}
	
	@RequestMapping("/error")
	public String getError() {
		return getErrorPath();
	}

}

　　當系統內發生錯誤後會跳轉到error頁面。

二.創建一個異常句柄ErrorExceperHandler

package com.example.demo.handler;

import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseStatus;
import org.springframework.web.servlet.ModelAndView;

@ControllerAdvice
public class ErrorExceperHandler {

	@ExceptionHandler
	@ResponseStatus(HttpStatus.OK)
	public ModelAndView processException(Exception exception) {
		ModelAndView modelAndView = new ModelAndView();
		modelAndView.addObject("exception", exception.getMessage());
		modelAndView.setViewName("/error/error");
		return modelAndView;
	}
	
	@ExceptionHandler
	@ResponseStatus(HttpStatus.OK)
	public ModelAndView processException(RuntimeException exception) {
		ModelAndView modelAndView = new ModelAndView();
		modelAndView.addObject("exception", exception.getMessage());
		modelAndView.setViewName("/error/error");
		return modelAndView;
	}
}

　　重載方法針對Exception和RuntimeException進行攔截，當系統發生異常後，會跳轉到異常頁面。

package com.example.demo.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import com.example.demo.entity.Student;

@Controller
@RequestMapping("/student/")
public class StudentController {
	
	@RequestMapping("show")
	public String show(Model model) throws Exception {
		
		Student stu = new Student();
		stu.setId(1001);
		stu.setName("小明");
		model.addAttribute("student", stu);
		
		if (!"a".equals("")) {
			throw new RuntimeException("RuntimeException....");
		}
		
		if (!"a".equals("")) {
			throw new Exception("Exception....");
		}
		
		return "show";
	}

}

　　在做spring或springboot開發的時候推薦使用第二種。

springboot 常用的異常處理方式