SpringMVC异常处理方式三：异常处理类

实现 HandlerExceptionResolver 接口的异常处理类，处理全局抛出的异常。

异常处理类 MyExceptinHandler

package com.bb.exception;

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

import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;
/**
 * 全局异常处理器
 * @author Administrator
 *
 */
@Component
public class MyExceptinHandler implements HandlerExceptionResolver{

	/**
	 * 当有异常发生的时候执行的方法
	 *   如果不处理 返回null
	 */
	@Override
	public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler,
			Exception ex) {
		ModelAndView mm = new ModelAndView();
		if(ex instanceof NullPointerException){
			mm.addObject("msg", "NullPointerException ....");
		}else if(ex instanceof ArithmeticException){
			mm.addObject("msg", "ArithmeticException ....");
		}else{
			mm.addObject("msg", "其他异常 ....");
		}
		mm.setViewName("/error.jsp");
		return mm;
	}

	

}

测试类

package com.bb.controller;

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

@Controller
public class UserController {

	@RequestMapping("/query1")
	public String query1(Integer num) throws NullPointerException {
		System.out.println("query1....");
		if(num == 1){
			// 我们抛出一个异常信息
			throw new NullPointerException();
		}
		return "user.jsp";
	}
	
	@RequestMapping("/query2")
	public String query2(Integer num) throws ArithmeticException{
		System.out.println("query2....");
		if(num == 1){
			// 我们抛出一个异常信息
			throw new ArithmeticException();
		}
		return "user.jsp";
	}
	
}

测试截图