SpringMVC07SelfException 自定義異常
阿新 • • 發佈：2017-11-05
ive sch n) content form utf del beans dispatch
1.配置web.xml文件
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd" > <web-app> <display-name>Archetype Created Web Application</display-name> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:spring-mvc.xml</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
2.1：用戶異常類
public class UserInfoException extends Exception { public UserInfoException() { } public UserInfoException(String message) { super(message); } }
2.2：用戶名異常
public class NameException extends UserInfoException { public NameException() { } public NameException(String message) {super(message); } }
2.3：年齡異常
public class AgeException extends UserInfoException { public AgeException() { } public AgeException(String message) { super(message); } }
3.異常解析器
import cn.happy.exceptions.AgeException; import cn.happy.exceptions.NameException; import org.springframework.web.servlet.HandlerExceptionResolver; import org.springframework.web.servlet.ModelAndView; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; //處理程序異常解析器 public class MyHandlerExceptionResolver implements HandlerExceptionResolver { //解析異常 @Override public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) { ModelAndView mv = new ModelAndView(); mv.setViewName("/error.jsp"); //默認異常頁面 if (ex instanceof NameException) { mv.setViewName("/error/NameException.jsp"); } else if (ex instanceof AgeException) { mv.setViewName("/error/AgeException.jsp"); } return mv; } }
4.處理器
import cn.happy.exceptions.AgeException; import cn.happy.exceptions.NameException; import cn.happy.exceptions.UserInfoException; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; @Controller public class FirstController { @RequestMapping("/first") public String doFirst(String name, int age) throws UserInfoException { if (!"admin".equals(name)) { throw new NameException("用戶名錯誤"); } else if (age > 60) { throw new AgeException("年齡錯誤"); } return "/index.jsp"; } }
5.映射器
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd"> <context:component-scan base-package="cn.happy"/> <!--註解驅動--> <mvc:annotation-driven/> <!--自定義異常處理器處理--> <bean class="cn.happy.hanlderexception.MyHandlerExceptionResolver"/> </beans>
6.1:視圖NameException.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h2>用戶名錯誤</h2>
</body>
</html>
6.2:視圖AgeException.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h2>年齡錯誤</h2>
</body>
</html>
6.3：視圖login.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<form action="/first" method="post">
用戶名：<input name="name"/>
年齡：<input name="age"/>
<input type="submit" value="登錄"/>
</form>
</body>
</html>
6.4:視圖error.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h2>ErrorPage出錯了</h2>
${ex.localizedMessage}
</body>
</html>
6.5:視圖index.jsp
<html> <body> <h2>Hello World!</h2> </body> </html>
SpringMVC07SelfException 自定義異常