5. 全局异常捕捉
Posted blackcatfish
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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.GlobalDefaultExceptionHandler package com.kfit.base.exception; importjavax.servlet.http.HttpServletRequest; importorg.springframework.web.bind.annotation.ControllerAdvice; import org.springframework.web.bind.annotation.ExceptionHandler; @ControllerAdvice publicclass GlobalDefaultExceptionHandler { @ExceptionHandler(value =Exception.class) publicvoiddefaultErrorHandler(HttpServletRequest req, Exception e) { // // If the exception is annotated [email protected] 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; } }
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