基于配置的异常处理

SpringMVC提供了一个处理控制器方法执行过程中所出现的异常的接口：HandlerExceptionResolver。

public interface HandlerExceptionResolver {
	@Nullable
	ModelAndView resolveException(
			HttpServletRequest request, HttpServletResponse response, @Nullable Object handler, Exception ex);
}

HandlerExceptionResolver接口的实现类有：DefaultHandlerExceptionResolver和SimpleMappingExceptionResolver。

SpringMVC提供了自定义的异常处理器SimpleMappingExceptionResolver，springmvc.xml中配置异常处理：

    
    
        
            
                
                error
            
        
        
        
    

controller中制造异常：

package com.lalala.controller;

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

@Controller
public class HelloController {

    @RequestMapping("/")
    public String index() {
        return "index";
    }

    @RequestMapping("/testExceptionHandler")
    public String testExceptionHandler() {
        System.out.println(1/0);
        return "success";
    }
}

基于注解的异常处理

package com.lalala.controller;

import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;

@ControllerAdvice
public class ExceptionController {
    @ExceptionHandler(value = {ArithmeticException.class, NullPointerException.class})
    public String testException(Exception ex, Model model){
        model.addAttribute("ex", ex);
        return "error";
    }
}