SpringMVC之异常处理

异常分为编译时异常和运行时异常，编译时异常我们trycatch捕获，捕获后自行处理，而运行时异常是不可预期的，就需要规范编码来避免，在SpringMVC中，不管是编译异常还是运行时异常，都可以最终由SpringMVC提供的异常处理器进行统一管理，这样就可以避免随时随地捕获异常的繁琐性。

 

三种处理方式

1.简单异常处理器：使用Spring MVC内置的异常处理器处理：SimpleMappingExceptionResolver

@Component
public class MysimpleMappingExceton  {@Beanpublic SimpleMappingExceptionResolver simpleMappingExceptionResolver(){SimpleMappingExceptionResolver simpleMappingExceptionResolver = new SimpleMappingExceptionResolver();//默认错误simpleMappingExceptionResolver.setDefaultErrorView("default.html");Properties properties = new Properties();properties.setProperty("java.lang.ArithmeticExceotion","erro1.html");properties.setProperty("java.io.FileNotFoundException","erro2.html");simpleMappingExceptionResolver.setExceptionMappings(properties);return simpleMappingExceptionResolver;}
}

2.自定义异常处理器：实现HandlerExceptionResolver接口，自定义异常进行处理

@Component
public class MyHandlerExceptionResolver implements HandlerExceptionResolver {@Overridepublic ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {ModelAndView modelAndView = new ModelAndView();modelAndView.setViewName("/default.html");return modelAndView;}
}

3.使用@ControllerAdvice@ExceptionHandler实现全局异常

@ControllerAdvice
public class GloExceotion {@ExceptionHandler(RuntimeException.class)@ResponseBodypublic Result runtimeException(){Result result = new Result(200,"错误",new Object());return result;}@ExceptionHandler(FileNotFoundException.class)public ModelAndView fileNotException(){ModelAndView modelAndView = new ModelAndView();modelAndView.setViewName("/erro2.html");return modelAndView;}@ExceptionHandler(Exception.class)public ModelAndView Exception(){ModelAndView modelAndView = new ModelAndView();modelAndView.setViewName("/default.html");return modelAndView;}
}

例子

@RestController
public class ExceptionController {@RequestMapping("/e1")public String e1 (){int a=10/0;return "ruuning exception";}@RequestMapping("/e2")public String e2() throws FileNotFoundException {FileInputStream fileInputStream = new FileInputStream("file:/barch:/");return "ruuning exception";}@RequestMapping("/e3")public String e3()  {int [] array ={1,2};System.out.println(array[5]);return "ruuning exception";}
}