SSM框架重構達內NETCTOSS項目——(4)處理異常

原創

kaidi224

2020-02-21 22:06

處理NETCTOSS項目中的異常

問題：

使用@ExceptionHandler處理LoginController中的業務異常：

修改LoginController，增加異常處理方法，並使用@ExceptionHandler處理業務異常：

@ExceptionHandler
public String execute(HttpServletRequest request,HttpServletResponse response, Exception e) throws Exception {
    if(e instanceof AdminCodeException || e instanceof PasswordException) {
        //業務異常自己處理
        request.setAttribute("message", e.getMessage());
        request.setAttribute("adminCode", request.getParameter("adminCode"));
        request.setAttribute("password", request.getParameter("password"));
        return "main/login";
    } else {
        //系統異常拋出，交給Spring處理
        throw e;
    }
}

使用SimpleMappingExceptionResolver處理系統異常：

配置spring-mvc.xml，增加SimpleMappingExceptionResolver

<!--處理系統異常-->
<bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
    <property name="exceptionMappings">
        <props>        
            <prop key="java.lang.Exception">main/error</prop>
        </props>
    </property>
</bean>

在WEB-INF/jsp/main下，創建系統錯誤頁面error.jsp，代碼如下：

<%@ page pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <title>達內－NetCTOSS</title>
        <!-- 
        當前: netctoss-trySSM/login/checkLogin.do
        	目標: netctoss-trySSM/styles/global.css
        	 -->
        <link type="text/css" rel="stylesheet" media="all" href="../styles/global.css" />
        <link type="text/css" rel="stylesheet" media="all" href="../styles/global_color.css" />
        <script language="javascript" type="text/javascript">
            var timer;
            //啓動跳轉的定時器
            function startTimes() {
                timer = window.setInterval(showSecondes,1000);
            }

            var i = 5;
            function showSecondes() {
                if (i > 0) {
                    i--;
                    document.getElementById("secondes").innerHTML = i;
                }
                else {
                    window.clearInterval(timer);
                    /*
			        	目標: netctoss-trySSM/login/toLogin.do
                    */
                    location.href = "/netctoss-trySSM/login/toLogin.do";
                }
            }

            //取消跳轉
            function resetTimer() {
                if (timer != null && timer != undefined) {
                    window.clearInterval(timer);
                    location.href = "/netctoss-trySSM/login/toLogin.do";
                }
            }
        </script> 
    </head>
    <body class="error_page" οnlοad="startTimes();">
        <h1 id="error">
	        遇到錯誤， <span id="secondes">5</span> 秒後將自動跳轉，立即跳轉請點擊 
            <a  href="javascript:resetTimer();">返回</a>
        </h1>
    </body>
</html>