Exception handling in SpringBoot

SpringBoot There are five ways to handle exceptions:

A custom error page

　　SpringBoot default exception handling mechanism: SpringBoot default has provided a mechanism for handling exceptions. Once the program emerged url abnormal SpringBoot send a request like / error of. To provide a process called BasicExceptionController in springboot in / error requests, and then jump to the default display page to show abnormal abnormal information.

　　If we need to unify all of the abnormal jump to a custom error page, you need to create error.html page in src / main / resources / templates directory. And add the tag.

　　<span th:text="${exception}"></span>

Two, @ ExceptionHandle annotations for exception handling

　　Just add this method in the controller:

1 @ExceptionHandler(value={java.lang.ArithmeticException.class})
2 public ModelAndView arithmeticExceptionHandler(Exception e) {
3     ModelAndView mv = new ModelAndView();
4     mv.addObject("error", e.toString());
5     mv.setViewName("error");
6     return mv;
7 }

Three, @ ControllerAdvice + @ ExceptionHandler annotations for exception handling

　　Be able to handle exceptions need to create a global exception classes. On the class need to add @ControllerAdvice comment.

 1 @ControllerAdvice
 2 public class GlobalException {
 3     @ExceptionHandler(value={java.lang.ArithmeticException.class})
 4     public ModelAndView arithmeticExceptionHandler(Exception e) {
 5         ModelAndView mv = new ModelAndView();
 6         mv.addObject("error", e.toString());
 7         mv.setViewName("error");
 8         return mv;
 9     }
10 }

Fourth, configure SimpleMappingExceptionResolver handle exceptions

　　In the global exception class to add a method to complete the process unity exception class

 1 @Configuration
 2 public class GlobalException {
 3     public SimpleMappingExceptionResolver getSimpleMappingExceptionResolver() {
 4         SimpleMappingExceptionResolver resolver = new SimpleMappingExceptionResolver();
 5         Properties properties = new Properties();
 6         properties.put("java.lang.ArithmeticException", "error");
 7         resolver.setExceptionMappings(properties);
 8         return resolver;
 9     }
10 }

V. custom exception handling HandlerExceptionResolver

　　HandlerExceptionResolver interface need to achieve global exception class

 1 @Configuration
 2 public class GlobalException implements HandlerExceptionResolver {
 3     @Override
 4     public ModelAndView resolverException(HttpServletRequest request, HttpServletResponse response, Object object, Exception exception) {
 5         ModelAndView mv = new ModelAndView();
 6         if(exception instanceof ArithmeticException) {
 7             mv.setViewName("error");
 8         }
 9         mv.addObject("error", exception.toString());
10         return mv;
11     }
12 }