十四、异常的处理

十四、异常的处理

https://www.cnblogs.com/sunniest/p/4555801.html

1.处理局部异常（Controller内）

    @ExceptionHandler
    public ModelAndView exceptionHandler(Exception ex){
        ModelAndView mv = new ModelAndView("error");
        mv.addObject("exception", ex);
        System.out.println("in testExceptionHandler");
        return mv;
    }
    
    @RequestMapping("/error")
    public String error(){
        int i = 5/0;
        return "hello";
    }

2.处理全局异常（所有Controller）

@ControllerAdvice
public class testControllerAdvice {
    @ExceptionHandler
    public ModelAndView exceptionHandler(Exception ex){
        ModelAndView mv = new ModelAndView("error");
        mv.addObject("exception", ex);
        System.out.println("in testControllerAdvice");
        return mv;
    }
}

3.另一种处理全局异常的方法

在SpringMVC配置文件中配置

    <!-- configure SimpleMappingExceptionResolver -->
    <bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
        <property name="exceptionMappings">
            <props>
                <prop key="java.lang.ArithmeticException">error</prop>
            </props>
        </property>
    </bean>

error是出错页面

package test.SpringMVC;


import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;


@Controller
@RequestMapping("/exception")
public class exceptionController {

    //http://localhost:8080/HiSpringMVC/exception/hello
    @RequestMapping("/hello")
    public String hello(){        
        return "hello";
    }
    

    @ExceptionHandler
    public ModelAndView exceptionHandler(Exception ex){
        ModelAndView mv = new ModelAndView("error");
        mv.addObject("exception", ex);
        System.out.println("in testExceptionHandler");
        return mv;
    }
    
  //http://localhost:8080/HiSpringMVC/exception/error
    @RequestMapping("/error")
    public String error(){
        int i = 5/0;
        return "hello";
    }
    
}