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                局部異常只在特定的地方使用,而不是全局,比如只在指定的 controller 層中使用。 <br/> 捕捉局部異常的步驟如下: **1. 在controller層中指定異常類型** ```java /** * 1. 該方法拋出RuntimeException異常 */ @RequestMapping("/v5/get/student") public String getStudent05() { int i = 0; if (i < 1) throw new RuntimeException("id不能小于1."); return "student"; } /** * 2. 注解@ExceptionHandler根據value指定的異常類型對當前的controller類發生的異常進行處理 */ @ExceptionHandler(value = {RuntimeException.class}) public String handlerException(RuntimeException ex, HttpServletRequest request) { request.setAttribute("ex", ex); //跳轉到error.jsp頁面 return "error"; } ``` **2. 視圖層:`webapp/WEB-INF/views/error.jsp`** ```html <h1>---${ ex }---</h1> ``` **3. 測試** 啟動項目訪問 http://localhost:8080/mvc/v5/get/student 前端將會看到如下信息。 ``` ---java.lang.RuntimeException: id不能小于1.--- ```
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