SpringMVC之異常處理

異常分為編譯時異常和運行時異常，編譯時異常我們trycatch捕獲，捕獲后自行處理，而運行時異常是不可預期的，就需要規(guī)范編碼來避免，在SpringMVC中，不管是編譯異常還是運行時異常，都可以最終由SpringMVC提供的異常處理器進行統(tǒng)一管理，這樣就可以避免隨時隨地捕獲異常的繁瑣性。

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三種處理方式

1.簡單異常處理器：使用Spring MVC內(nèi)置的異常處理器處理：SimpleMappingExceptionResolver

@Component
public class MysimpleMappingExceton  {@Beanpublic SimpleMappingExceptionResolver simpleMappingExceptionResolver(){SimpleMappingExceptionResolver simpleMappingExceptionResolver = new SimpleMappingExceptionResolver();//默認錯誤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.自定義異常處理器：實現(xiàn)HandlerExceptionResolver接口，自定義異常進行處理

@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實現(xiàn)全局異常

@ControllerAdvice
public class GloExceotion {@ExceptionHandler(RuntimeException.class)@ResponseBodypublic Result runtimeException(){Result result = new Result(200,"錯誤",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";}
}