关于spring:SpringMVC异常的处理

应用场景：当浏览器向浏览器发送申请，而服务器解决申请呈现了异样的状况，如果间接把错误信息给浏览器展现进去是很不好的，因为用户就能看到具体的代码错误信息。所以当出现异常状况时，服务器能够给用户一个本次申请异样的页面，让用户晓得以后服务器有点问题，请稍后再试。

实现流程

• 1）自定义异样类

public class MyException  extends RuntimeException{
     private String message;
     public MyException(){}
     public MyException(String message){this.message = message;}
     public void setMessage(String message) {this.message = message;}
     @Override
     public String getMessage() {return message;}
}

• 2）自定义异样解决类，解决咱们抛出的异样

  • 对于异样的解决，我是把它转发到一个 error 页面，这里大家能够本人创立一个

@Component
public class ExceptionResolver implements HandlerExceptionResolver {
     @Override
     public ModelAndView resolveException(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) {if (e instanceof MyException){ModelAndView mv = new ModelAndView();
         mv.addObject("errorMessage", e.getMessage());
         mv.setViewName("error.jsp");
         return mv;
        }
        return null;
     }
}

• Controller 类：这里是捕捉了一个空指针异样，而后抛出了咱们自定义的异样

@Controller
public class UserController {@RequestMapping("testException.do")
     public String testException(){
     try {
            String str = null;
            str.length();}catch (NullPointerException e){e.printStackTrace();
            throw new MyException("服务器忙碌，请稍后再试！！！");
     }
            return "testException.jsp";
     }
}

• ApplicationContext.xml（Spring 外围配置文件）配置信息如下：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xmlns:context="http://www.springframework.org/schema/context"
 xmlns:aop="http://www.springframework.org/schema/aop"
 xmlns:mvc="http://www.springframework.org/schema/mvc"
 xsi:schemaLocation="http://www.springframework.org/schema/beans
 https://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!-- 开启 spring 注解驱动 -->
 <context:component-scan base-package="com.cjh"/>
<!-- 开启 mvc 注解驱动 -->
 <mvc:annotation-driven></mvc:annotation-driven>

</beans>