5. 全局异常捕捉

在一个项目中的异常我们我们都会统一进行处理的，那么如何进行统一进行处理呢？

新建一个类GlobalDefaultExceptionHandler，

在class注解上@ControllerAdvice,

在方法上注解上@ExceptionHandler(value= Exception.class)，具体代码如下：

 

com.kfit.base.exception.GlobalDefaultExceptionHandlerpackage com.kfit.base.exception;importjavax.servlet.http.HttpServletRequest;importorg.springframework.web.bind.annotation.ControllerAdvice;import org.springframework.web.bind.annotation.ExceptionHandler;@ControllerAdvicepublicclass GlobalDefaultExceptionHandler {@ExceptionHandler(value =Exception.class)publicvoiddefaultErrorHandler(HttpServletRequest req, Exception e) {// // If the exception is annotated with@ResponseStatus rethrow it and let// // the framework handle it - like theOrderNotFoundException example// // at the start of this post.// // AnnotationUtils is a Spring Frameworkutility class.// if (AnnotationUtils.findAnnotation(e.getClass(),ResponseStatus.class) != null)// throw e;//// // Otherwise setup and send the user to adefault error-view.// ModelAndView mav = newModelAndView();// mav.addObject("exception", e);// mav.addObject("url",req.getRequestURL());// mav.setViewName(DEFAULT_ERROR_VIEW);// return mav;//打印异常信息： e.printStackTrace();System.out.println("GlobalDefaultExceptionHandler.defaultErrorHandler()");/** 返回json数据或者String数据：* 那么需要在方法上加上注解：@ResponseBody* 添加return即可。*//** 返回视图：* 定义一个ModelAndView即可，* 然后return;* 定义视图文件(比如：error.html,error.ftl,error.jsp);**/}}

 

com.kfit.test.web.DemoController 加入方法：

@RequestMapping("/zeroException")publicintzeroException(){return 100/0;}

 

访问：http://127.0.0.1:8080/zeroException这个方法肯定是抛出异常的,那么在控制台就可以看到我们全局捕捉的异常信息了。

 

更精确的异常捕捉：

@Controller public class ExceptionHandlingController {// @RequestHandler methods// Exception handling methods// Convert a predefined exception to an HTTP Status code@ResponseStatus(value=HttpStatus.CONFLICT, reason="Data integrity violation") // 409@ExceptionHandler(DataIntegrityViolationException.class)public void conflict() {// Nothing to do }// Specify the name of a specific view that will be used to display the error:@ExceptionHandler({SQLException.class,DataAccessException.class})public String databaseError() {// Nothing to do. Returns the logical view name of an error page, passed to// the view-resolver(s) in usual way.// Note that the exception is _not_ available to this view (it is not added to// the model) but see "Extending ExceptionHandlerExceptionResolver" below.return "databaseError";}// Total control - setup a model and return the view name yourself. Or consider// subclassing ExceptionHandlerExceptionResolver (see below).@ExceptionHandler(Exception.class)public ModelAndView handleError(HttpServletRequest req, Exception exception) {logger.error("Request: " + req.getRequestURL() + " raised " + exception);ModelAndView mav = new ModelAndView();mav.addObject("exception", exception);mav.addObject("url", req.getRequestURL());mav.setViewName("error");return mav;} }

 

转载于:https://www.cnblogs.com/blackCatFish/p/9886308.html

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