springmvc 全局异常处理的三种方法

Love The Way You Lie 2022-05-27 06:18 231阅读 0赞

**第一种 **

**通过SimpleMappingExceptionResolver类来定义,springmvc.xml内容**

**自定义的异常可以继承Exception类**

<bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
    
    		<property name="defaultErrorView" value="error"/>
    
    		<property name="exceptionAttribute" value="errMsg"/>
    
    		<property name="exceptionMappings">
    			<props>
    				<prop key="com.samrtian.exception.CustomException">error1</prop>
    			</props>
    		</property>
    	</bean>

**第二种    **

**通过实现HandlerExceptionResolver接口来定义  **

**springmvc.xml内容**

<bean class="com.samrtian.exception.CustomExceptionResolver"></bean>

接口实现  CustomException是继承了Exception类的自定义异常.

public class CustomExceptionResolver implements HandlerExceptionResolver {
    
    	@Override
    	public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler,
    			Exception ex) {
    		// TODO Auto-generated method stub
    		
    		CustomException customException = null;
    		if (ex instanceof CustomException) {
    			customException = (CustomException)ex;
    		}else{
    			customException = new CustomException("未知错误!");
    		}
    		String errMsg = customException.getMessage(); 
    		
    		ModelAndView modelAndView = new ModelAndView();
    		modelAndView.addObject("error", errMsg);
    		modelAndView.setViewName("error");
    		return modelAndView;
    	}
    	
    }

**第三种**

**使用@ExceptionHandler 注解定义**

这个更简单了直接在控制器里加入方法,但是必须跟抛异常的方法在同一个控制器里

@Controller
    public class LoginAction {
    	
    	@ExceptionHandler(CustomException.class)
    	public String catchException(CustomException e, HttpServletRequest request) {
    		System.out.println("进来了");
    		request.setAttribute("errMsg", "注解的异常");
    		return "error";
    	}
    
    	@RequestMapping("/login.do")
    	public ModelAndView login(int id) throws Exception {
    		// TODO Auto-generated method stub	
    		if (id == 1) {
    			throw new CustomException("自定义的异常");
    		}
    		
    		if (id == 2) {
    			throw new Exception("Exception的异常");
    		}
    
    		ModelAndView modelAndView = new ModelAndView();
    		modelAndView.setViewName("LoginSuccess");
    		return modelAndView;
    	}

个人比较偏好第一种，简单明了