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Struts框架中通过Action的结果映射配置返回视图，Action对象是Struts2框架中的请求处理对象那，针对不同的业务请求及处理结果，Action将返回一个字符串，这个字符串就是Action处理结果的逻辑名，Struts2框架将更加逻辑视图名称，到配置文件struts.xml中查找逻辑视图名称匹配的视图，找到之后将这个视图回应给浏览器。
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要求：编写Action对象，处理对表单提交的数据，模拟实现对指定用户的问候。
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1、创建web项目，jwrm04-helloToSB，把包添加到lib，web.xml中注册过滤器。（详见web08）。
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2、创建类GreetingAction的Action对象。
package dog;import com.opensymphony.xwork2.ActionSupport;public class GreetingAction extends ActionSupport{private static final long serialVersionUID=1L;//用户名private String username;//处理请求 @Overridepublic String execute() throws Exception{//判断用户名是否有效if(username==null||"".equals(username)){//返回到错误页面return ERROR;}else{//返回到成功界面return SUCCESS;}}//username的getter方法public String getUsername(){return username;}//username的setter方法public void setUsername(String username){this.username=username;} }
GreetingAction类用于对表单提交的username进行处理。
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3、配置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><!-- 声明包 --><package name="myPackage" extends="struts-default"><!-- 定义action --><action name="greeting" class="dog.GreetingAction"><!-- 定义成功的映射页面 --><result name="success">success.jsp</result><!-- 定义失败的映射页面 --><result name="error">error.jsp</result></action></package> </struts>
就是说，当web应用访问目录下“greeting”时，将有GreetingAction类对请求作出处理。
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4、index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html><head><base href="<%=basePath%>"><title>My JSP 'index.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--></head><body><form action="greeting.action" method="post">请输入您的姓名：<input type="text" name="username"><input type="submit" value="提交"></form></body> </html>
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5、创建success.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <%@ taglib prefix="s" uri="/struts-tags" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html><head><base href="<%=basePath%>"><title>My JSP 'success.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--></head><body><font color="red"><s:property value="username"/></font>,您好！欢迎来到本站。</body> </html>
类似，创建error.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <%@ taglib prefix="s" uri="/struts-tags" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html><head><base href="<%=basePath%>"><title>My JSP 'error.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--></head><body><font color="red">错误，您没有输入用户名！</font></body> </html>
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6、部署，访问：http://localhost:8080/jwrm04-helloToSB/index.jsp
点击“提交”
输入框为空时点击“提交”
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完毕
