功能：
利用struts.xml 捕获异常
不满足这三个值就报异常
1.web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>
2.UserAction.java
package com.action; import com.opensymphony.xwork2.ActionSupport; public class UserAction extends ActionSupport{ private static final long serialVersionUID=1L; private String name; private String age; private String tel; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getAge() { return age; } public void setAge(String age) { this.age = age; } public String getTel() { return tel; } public void setTel(String tel) { this.tel = tel; } public String execute() throws Exception{ if(!getName().equals("Tom")) { throw new SecurityException("Wrong Name!"); } else if(!getAge().equals("20")) { throw new Exception("Wrong Age!"); } else if(!getTel().equals("12345")) { throw new java.sql.SQLException(); } else { return SUCCESS; } } }
3.SecurityException.java
package com.action; public class SecurityException extends Exception{ private static final long serialVersionUID=1L; public SecurityException() { super(); } private String message; public SecurityException(String message) { this.message=message; } public String getMessage() { return message; } }
4.index.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib prefix="s" uri="/struts-tags"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> <center> <s:form action="user" method="post" namespace="/"> <!-- method="post" namespace="/" 可加可不加？ --> <s:textfield label="Name" name="name" /> <s:textfield label="Age" name="age" /> <s:textfield label="Tel" name="tel" /> <s:submit/> </s:form> </center> </body> </html>
5.struts.xml
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <package name="default" namespace="/" extends="struts-default"> <global-results> <result name="Exception">/Exception.jsp</result> <result name="SQLException">/SQLException.jsp</result> </global-results> <global-exception-mappings> <exception-mapping exception="java.lang.Exception" result="Exception"></exception-mapping> <exception-mapping exception="java.sql.SQLException" result="SQLException"></exception-mapping> </global-exception-mappings> <action name="user" class="com.action.UserAction"> <exception-mapping exception="com.action.SecurityException" result="Login"></exception-mapping> <result name="Login">/Login.jsp</result> <result>/success.jsp</result> </action> </package> </struts>
6.Exception.jsp/ SQLException.jsp/ Login.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib prefix="s" uri="/struts-tags"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> <center> <s:property value="exception.message" /><br/> <s:property value="exceptionStack" /><br/> </center> </body> </html>
7.success.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib prefix="s" uri="/struts-tags"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> <center> <h2>success!!!</h2> </center> </body> </html>