springmvc自定義異常
阿新 • • 發佈：2018-12-24
寫程式碼過程中，經常需要再程式碼裡寫try catch，比較麻煩。可以單獨抽取出來。
先看效果
1普通調整異常頁面
2ajax異常返回
直接上程式碼了
1.再spring-mvc.xml中配置自定義異常類
<!-- 異常處理類 -->
<bean id="exceptionHandler"
class="com.ncme.common.exception.GlobalExceptionResolver" />
2、異常類寫法
package com.ncme.common.exception; import java.io.IOException; import java.io.PrintWriter; import java.io.StringWriter; import java.util.HashMap; import java.util.Map; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.stereotype.Component; import org.springframework.web.servlet.HandlerExceptionResolver; import org.springframework.web.servlet.ModelAndView; import com.ncme.common.dto.AjaxResult; import com.ncme.common.util.JSONHelper; /** * spring mvc 全域性處理異常捕獲 根據請求區分ajax和普通請求，分別進行響應. * 第一、異常資訊輸出到日誌中。 * 第二、擷取異常詳細資訊的前50個字元，寫入日誌表中t_s_log。 */ @Component public class GlobalExceptionResolver implements HandlerExceptionResolver { @Override public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) { boolean isajax = isAjax(request,response); Throwable deepestException = deepestException(ex); return processException(request, response, handler, deepestException, isajax); } /** * 判斷當前請求是否為非同步請求. */ private boolean isAjax(HttpServletRequest request, HttpServletResponse response){ return isNotEmpty(request.getHeader("X-Requested-With")); } public static boolean isNotEmpty(Object object) { if (object != null && !object.equals("") && !object.equals("null")) { return (true); } return (false); } /** * 獲取最原始的異常出處，即最初丟擲異常的地方 */ private Throwable deepestException(Throwable e){ Throwable tmp = e; int breakPoint = 0; while(tmp.getCause()!=null){ if(tmp.equals(tmp.getCause())){ break; } tmp=tmp.getCause(); breakPoint++; if(breakPoint>1000){ break; } } return tmp; } /** * 處理異常. * @param request * @param response * @param handler * @param deepestException * @param isajax * @return */ private ModelAndView processException(HttpServletRequest request, HttpServletResponse response, Object handler, Throwable ex, boolean isajax) { //步驟一、異常資訊記錄到日誌檔案中. // log.error("全域性處理異常捕獲:", ex); //步驟二、異常資訊記錄擷取前50字元寫入資料庫中. // logDb(ex); //步驟三、分普通請求和ajax請求分別處理. if(isajax){ return processAjax(request,response,handler,ex); }else{ return processNotAjax(request,response,handler,ex); } } /** * 異常資訊記錄擷取前50字元寫入資料庫中 * @param ex */ /* private void logDb(Throwable ex) { //String exceptionMessage = getThrowableMessage(ex); String exceptionMessage = "錯誤異常: "+ex.getClass().getSimpleName()+",錯誤描述："+ex.getMessage(); if(oConvertUtils.isNotEmpty(exceptionMessage)){ if(exceptionMessage.length() > WIRTE_DB_MAX_LENGTH){ exceptionMessage = exceptionMessage.substring(0,WIRTE_DB_MAX_LENGTH); } } systemService.addLog(exceptionMessage, LOG_OPT,LOG_LEVEL); }*/ /** * ajax異常處理並返回. * @param request * @param response * @param handler * @param deepestException * @return */ private ModelAndView processAjax(HttpServletRequest request, HttpServletResponse response, Object handler, Throwable deepestException){ ModelAndView empty = new ModelAndView(); response.setContentType("application/json;charset=UTF-8"); // response.setContentType("text/plain;charset=UTF-8"); response.setHeader("Cache-Control", "no-store"); AjaxResult ajaxResult=new AjaxResult(); ajaxResult.setSuccess(false); ajaxResult.setMsg(deepestException.getMessage()); PrintWriter pw = null; try { pw=response.getWriter(); pw.write(JSONHelper.bean2json(ajaxResult)); pw.flush(); } catch (IOException e) { e.printStackTrace(); }finally{ try { pw.close(); } catch (Exception e2) { } } empty.clear(); return empty; } /** * 普通頁面異常處理並返回. * @param request * @param response * @param handler * @param deepestException * @return */ private ModelAndView processNotAjax(HttpServletRequest request, HttpServletResponse response, Object handler, Throwable ex) { String exceptionMessage = getThrowableMessage(ex); Map<String, Object> model = new HashMap<String, Object>(); model.put("ErrorMsg", ex); model.put("stack", exceptionMessage); return new ModelAndView("failure", model); } /** * 返回錯誤資訊字串 * * @param ex * Exception * @return 錯誤資訊字串 */ public String getThrowableMessage(Throwable ex) { StringWriter sw = new StringWriter(); PrintWriter pw = new PrintWriter(sw); ex.printStackTrace(pw); return sw.toString(); } }
3.定義異常跳轉錯誤頁面failure.jsp
<%@ page contentType="text/html;charset=utf-8"%> <!DOCTYPE HTML> <html> <head> <title>Failure</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <script type="text/javascript"> function forback() { if(window.history.length==0) { window.close(); } else { window.history.back(); } } </script> <style type="text/css"> #Error { COLOR: #B22222; FONT-SIZE: 14px; } </style> </head> <body leftmargin="0" topmargin="0" class="body1"> <center> <TABLE width="100%" height="600" border="0" cellPadding="0" cellSpacing="0"> <tr> <td align="center"> <table width="70%" border="0" cellpadding="1" cellspacing="0" bordercolor="#BDC7D6" bgcolor="#BDC7D6"> <tr> <td> <table width="100%" border="0" cellpadding="0" cellspacing="0" bordercolor="#BDC7D6" bgcolor="#FFFFFF" class="lankuang1"> <tr> <td height="25" align="left" valign="middle" bgcolor="#EFF3F7" class="lanbottom"> <strong style="color: #5F9EA0">報錯提醒：${ErrorMsg }</strong> </td> </tr> <tr> <td height="120" align="center"> <table width="90%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="73%" align="left" valign="middle"> <span onclick="showError()" style="cursor:pointer">出錯了，請聯絡管理員！</span> </td> </tr> <tr> <td colspan="2" align="center"> <input type="button" name="forward" value="返回 " class="but2" onClick="forback();"> </td> </tr> </table> </td> </tr> </table> </td> </tr> </table> </td> </tr> </TABLE> </center> <div style="display:none" id="errorcode"> <span id="Error">資訊：${ErrorMsg }</span> <br/> --------------------------------- 堆疊: ${stack } ----------- </div> </body> <script type="text/javascript"> function showError(){ document.getElementById("errorcode").style.display="block"; } </script> </html>