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  {
    @Bean
    public 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 {
    @Override
    public 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)
    @ResponseBody
    public 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;
    }
}

例子文章來源地址http://www.zghlxwxcb.cn/news/detail-653533.html

@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";
    }
}

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