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动态Formbean

2016-05-11 15:37 281 查看
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 {

@Override
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
// TODO Auto-generated method stub
StudentForm 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 {

@Override
public 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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