动态Formbean

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DynaActionForm是ActionForm的子类，可以创建带有动态属性结合的form beans，不需要开发者创建form bean类

先回忆下静态ActionForm

package demo;import org.apache.struts.action.ActionForm;public class StudentForm extends ActionForm {private String sname;private String major;private float score;private java.sql.Date birth;public String getSname() {return sname;}public void setSname(String sname) {this.sname = sname;}public String getMajor() {return major;}public void setMajor(String major) {this.major = major;}public float getScore() {return score;}public void setScore(float score) {this.score = score;}public java.sql.Date getBirth() {return birth;}public void setBirth(java.sql.Date birth) {this.birth = birth;}}

package demo;import java.io.PrintWriter;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.struts.action.Action;import org.apache.struts.action.ActionForm;import org.apache.struts.action.ActionForward;import org.apache.struts.action.ActionMapping;public class LoginAction extends Action {@Overridepublic ActionForward execute(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response)throws Exception {// TODO Auto-generated method stubStudentForm loginForm=(StudentForm)form;PrintWriter out=response.getWriter();out.print(loginForm.getSname()+" "+loginForm.getMajor()+" "+loginForm.getBirth()+" "+loginForm.getScore());//return null;}}

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE struts-config PUBLIC "-//Apache Software Foudation//DTD Struts Configuration 1.3//EN" "http://struts.apache.org/dtds/struts-config_1_3.dtd"><struts-config><form-beans><form-bean name="studentForm" type="demo.StudentForm"></form-bean></form-beans><action-mappings><action path="/login" type="demo.LoginAction" name="studentForm"></action></action-mappings></struts-config>

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">  <display-name></display-name>  <welcome-file-list>    <welcome-file>index.jsp</welcome-file>  </welcome-file-list>  <servlet>  <servlet-name>action</servlet-name><servlet-class>org.apache.struts.action.ActionServlet</servlet-class><init-param><param-name>config</param-name><param-value>/WEB-INF/struts-config.xml</param-value></init-param><load-on-startup>0</load-on-startup>  </servlet>  <servlet-mapping>  <servlet-name>action</servlet-name><url-pattern>*.do</url-pattern>  </servlet-mapping></web-app>

<%@ 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 'Login.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="<%= request.getContextPath() %>/login.do" method="post">    name:<input type="text" name="sname" /><br />    major:<input type="text" name="major" /><br />    birth:<input type="text" name="birth" /><br />    score:<input type="text" name="score" /><br />    <input type="submit" value="login" />    </form>  </body></html>

动态formbean

在<form-bean>标签下添加了<form-property>标签

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE struts-config PUBLIC "-//Apache Software Foudation//DTD Struts Configuration 1.3//EN" "http://struts.apache.org/dtds/struts-config_1_3.dtd"><struts-config><form-beans><form-bean name="studentForm" type="org.apache.struts.action.DynaActionForm"><form-property name="sname" type="java.lang.String"></form-property><form-property name="major" type="java.lang.String"></form-property><form-property name="birth" type="java.sql.Date"></form-property><form-property name="score" type="java.lang.Float"></form-property></form-bean></form-beans><action-mappings><action path="/studentAction" type="demo.StudentAction" name="studentForm"></action></action-mappings></struts-config>

web.xml没有变化，同上

package demo;import java.io.PrintWriter;import java.sql.Date;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.struts.action.Action;import org.apache.struts.action.ActionForm;import org.apache.struts.action.ActionForward;import org.apache.struts.action.ActionMapping;import org.apache.struts.action.DynaActionForm;public class StudentAction extends Action {@Overridepublic ActionForward execute(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response) throws Exception {DynaActionForm studentForm=(DynaActionForm)form;String sname=(String)studentForm.get("sname");String major=(String)studentForm.get("major");Date birth=(Date)studentForm.get("birth");float score=(Float) studentForm.get("score");PrintWriter out=response.getWriter();out.print(sname+"\t"+major+"\t"+birth+"\t"+score);return null;}}

StudentForm不再需要，已经在struts-config.xml进行了配置

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