Struts2(七)基础小结
一、struts2和action
二、Result
三、struts.xml
四、namespace
第一种绝对路径
<form action="${pageContext.request.contextPath }/user/login.action" method="post">
第二种
<form action="<%=request.getContextPath() %>/user/login.action" method="post">
第三种 页面中直接写以下代码
<% String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; %> <base href="<%=basePath%>"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<form action="user/login.action" method="post">
提交地址不用改变
五、异常机制
局部异常
package com.pb.web.action; import java.sql.SQLException; import java.util.InputMismatchException; import com.opensymphony.xwork2.ActionSupport; public class HourseAction extends ActionSupport { /** * */ private static final long serialVersionUID = 1L; public String add() throws InputMismatchException{ System.out.println("执行添加操作！"); if(1==1){ //调用service的方法 throw new InputMismatchException(); } return "success"; } public String update() throws NullPointerException{ System.out.println("执行更新操作！"); if(1==1){ //调用service的方法 throw new NullPointerException(); } return "success"; } public String delete() throws SQLException{ System.out.println("执行删除操作！"); if(1==1){ //调用service的方法 throw new SQLException(); } return "success"; } }
页面
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!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> <form action="hourse_add"> <input type="submit" value="添加"/> </form> <form action="hourse_update"> <input type="submit" value="更新"/> </form> <form action="hourse_delete"> <input type="submit" value="删除"/> </form> </body> </html>
error页面
<%@ 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> error.jsp <s:property value="exception"/> <s:property value="exceptionStack"/> </body> </html>
struts.xml
<global-results> <result name="error">/error.jsp</result> </global-results> <action name="hourse_add" class="com.pb.web.action.HourseAction" method="add"> <result name="success" type="dispatcher"> /loginSuccess.jsp </result> <exception-mapping result="error" exception="java.util.InputMismatchException"></exception-mapping> </action> <action name="hourse_update" class="com.pb.web.action.HourseAction" method="update"> <result name="success" type="dispatcher"> /loginSuccess.jsp </result> <exception-mapping result="error" exception="java.lang.NullPointerException"></exception-mapping> </action> <action name="hourse_delete" class="com.pb.web.action.HourseAction" method="delete"> <result name="success" type="dispatcher"> /loginSuccess.jsp </result> <exception-mapping result="error" exception="java.sql.SQLException"></exception-mapping> </action>
全局异常更改struts.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" "http://struts.apache.org/dtds/struts-2.3.dtd"> <struts> <!-- <package name="default" namespace="/" extends="struts-default"> <default-action-ref name="index" /> <global-results> <result name="error">/error.jsp</result> </global-results> <global-exception-mappings> <exception-mapping exception="java.lang.Exception" result="error"/> </global-exception-mappings> <action name="index"> <result type="redirectAction"> <param name="actionName">HelloWorld</param> <param name="namespace">/example</param> </result> </action> </package> <include file="example.xml"/> --> <!-- Add packages here --> <constant name="struts.enable.DynamicMethodInvocation" value="false" /> <constant name="struts.devMode" value="true" /> <package name="base" namespace="/base" extends="struts-default"> <global-results> <result name="error">error.jsp</result> </global-results> <global-exception-mappings> <exception-mapping result="error" exception="java.util.InputMismatchException"></exception-mapping> <exception-mapping result="error" exception="java.lang.NullPointerException"></exception-mapping> <exception-mapping result="error" exception="java.sql.SQLException"></exception-mapping> </global-exception-mappings> </package> <!-- 继承base包--> <package name="user" extends="base"> <action name="login" class="com.pb.web.action.LoginAction" method="login"> <result name="success" type="dispatcher"> /loginSuccess.jsp <!-- http://www.baidu.com/ --> </result> <result name="input" type="dispatcher"> /login.jsp </result> </action> <action name="hourse_add" class="com.pb.web.action.HourseAction" method="add"> <result name="success" type="dispatcher"> /loginSuccess.jsp </result> </action> <action name="hourse_update" class="com.pb.web.action.HourseAction" method="update"> <result name="success" type="dispatcher"> /loginSuccess.jsp </result> </action> <action name="hourse_delete" class="com.pb.web.action.HourseAction" method="delete"> <result name="success" type="dispatcher"> /loginSuccess.jsp </result> </action> </package> </struts>
