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SpringMVC07SelfException 自定义异常
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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：用户异常类
public class UserInfoException extends Exception {
public UserInfoException() {
}
public UserInfoException(String message) {
super(message);
}
}
2.2：用户名异常
public class NameException extends UserInfoException {
public NameException() {
}
public NameException(String message) {
super(message);
}
}
2.3：年龄异常
public class AgeException extends UserInfoException {
public AgeException() {
}
public AgeException(String message) {
super(message);
}
}
3.异常解析器
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;
//处理程序异常解析器
public class MyHandlerExceptionResolver implements HandlerExceptionResolver {
//解析异常
@Override
public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
ModelAndView mv = new ModelAndView();
mv.setViewName("/error.jsp"); //默认异常页面
if (ex instanceof NameException) {
mv.setViewName("/error/NameException.jsp");
} else if (ex instanceof AgeException) {
mv.setViewName("/error/AgeException.jsp");
}
return mv;
}
}
4.处理器
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("用户名错误");
} else if (age > 60) {
throw new AgeException("年龄错误");
}
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"/> <!--注解驱动-->
<mvc:annotation-driven/> <!--自定义异常处理器处理-->
<bean class="cn.happy.hanlderexception.MyHandlerExceptionResolver"/>
</beans>
6.1:视图NameException.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h2>用户名错误</h2>
</body>
</html>
6.2:视图AgeException.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h2>年龄错误</h2>
</body>
</html>
6.3：视图login.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<form action="/first" method="post">
用户名：<input name="name"/>
年龄：<input name="age"/>
<input type="submit" value="登录"/>
</form>
</body>
</html>
6.4:视图error.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h2>ErrorPage出错了</h2>
${ex.localizedMessage}
</body>
</html>
6.5:视图index.jsp
<html>
<body>
<h2>Hello World!</h2>
</body>
</html>
测试结果：正常登录
测试结果：测试用户名异常
测试结果：测试年龄异常
测试结果：测试直接在网址进入页面
