9、SpringMVC異常處理解決方案
阿新 • • 發佈：2020-07-31
1、自定義異常類
/** * 自定義異常類 */ public class SysException extends Exception{ //儲存提示資訊 private String message; public SysException(String message) { this.message = message; } @Override public String getMessage() { return message; } public void setMessage(String message) { this.message = message; } }
2、處理異常業務邏輯
public class SysExceptionResolver implements HandlerExceptionResolver{ /** * 處理異常業務邏輯 * @param httpServletRequest * @param httpServletResponse * @param o * @param ex * @return */ @Override public ModelAndView resolveException(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception ex) { //獲取到異常物件 SysException e = null; if(ex instanceof SysException){ e = (SysException)ex; }else{ e = new SysException("系統正在維護"); } //建立ModelAndView物件 ModelAndView mv = new ModelAndView(); mv.addObject("errorMsg", e.getMessage()); mv.setViewName("error"); return mv; } }
3、配置異常處理器
<!--配置異常處理器-->
<bean id="sysExceptionResolver" class="com.example.exception.SysExceptionResolver"></bean>
4、請求頁
<a href="testException">異常處理</a>
5、控制器
@Controller public class UserController { @RequestMapping("/testException") public String testException() throws SysException { try { //模擬異常 int i= 10/0; } catch (Exception e) { //列印異常資訊 e.printStackTrace(); //丟擲自定義異常資訊 throw new SysException("分母不能為零"); } return "success"; } }
6、錯誤頁面
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
<title>Title</title>
</head>
<body>
${errorMsg}
</body>
</html>
解析