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springmvc 的异常处理

雨鸣静声 2022-04-13 阅读 48
javaspring

springmvc的异常处理有局部异常和全局异常。

一、局部异常(只针对当前的Controller)

 实现步骤:创建自定义异常类:

package com.song.ssm.util;

public class MyException extends RuntimeException {

    public MyException() {
    }

    public MyException(String message) {
        super(message);
    }

    public MyException(String message, Throwable cause) {
        super(message, cause);
    }

    public MyException(Throwable cause) {
        super(cause);
    }

    public MyException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {
        super(message, cause, enableSuppression, writableStackTrace);
    }
}

控制器中添加异常处理方法:

 @ExceptionHandler(MyException.class)
    public String execptionHandle(HttpServletRequest request,MyException myException){
        request.setAttribute("mess",myException.getMessage());
        return "error";
    }

二、全局异常(针对整个项目)

1:xml实现方式:在springmvc的配置文件中添加如下代码:

 <bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
         <property name="exceptionMappings">
             <props>
                 <prop key="com.song.ssm.util.MyException">error</prop>
                 <prop key="java.lang.NullPointerException">error1</prop>
                 <prop key="java.lang.ArrayIndexOutOfBoundsException">error2</prop>
             </props>
         </property>
    </bean>

2:annotation方式:创建全局异常处理类:

@ControllerAdvice
public class ExceptionController {

    @ExceptionHandler(NullPointerException.class)
    public String nullHandlerException(Model model){
         model.addAttribute("mess","空指针异常!");
         return "error1";
    }
    @ExceptionHandler(ArrayIndexOutOfBoundsException.class)
    public String arrayHandlerException(Model model){
        model.addAttribute("mess","下标越界异常!");
        return "error2";
    }
}

分别在error1和error2页面中显示对应的异常消息即可!

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