Struts 1.2笔记：ActionForm中scope为session的情况分布式收集数据

本文的示例将创建几个页面，每个页面将会有一些信息需要用户填写，最后将这几个信息全部收集起来呈现。这就是分布式收集数据。

1.数据收集页面

step1.jsp

step2.jsp

<%@ page language="java" contentType="text/html; charset=GB18030"
    pageEncoding="GB18030"%>
<!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=GB18030">
<title>产品信息</title>
</head>
<body>
<h1>产品信息</h1><hr>
<form action="step2.do" method="post">
  <input type="checkbox" name="productID" value="1"/>产品1<br>
  <input type="checkbox" name="productID" value="2"/>产品2<br>
  <input type="checkbox" name="productID" value="3"/>产品3<br>
  <input type="checkbox" name="productID" value="4"/>产品4<br>
  <input type="checkbox" name="productID" value="5"/>产品5<br><p>
  <input type="submit" value="下一步"/>
</form>
</body>
</html>

step3.jsp

finish.jsp

<%@ page language="java" contentType="text/html; charset=GB18030"
    pageEncoding="GB18030"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions"%>
<!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=GB18030">
<title>确认订单</title>
</head>
<body>
<h1>确认订单</h1>
<hr>
<form action="finish.do" method="post">
  姓名：${stepForm.username }<br>
  产品：
  <c:forEach items="${stepForm.productID}" var="p" varStatus="vs">
   产品${p }
   <c:if test="${vs.count != fn:length(stepForm.productID)}" var="v">
    ，
   </c:if>
  </c:forEach>

  <br>
  地址：${stepForm.address }<br>
  <input type="submit" value="确认">
</form>
</body>
</html>

2.StepActionForm.java

package com;

import org.apache.struts.action.ActionForm;

public class StepActionForm extends ActionForm {

private static final long serialVersionUID = 1L;

private String username;
private int[] productID;
private String address;

public String getUsername() {
  return username;
}
public void setUsername(String username) {
  this.username = username;
}
public int[] getProductID() {
  return productID;
}
public void setProductID(int[] productID) {
  this.productID = productID;
}
public String getAddress() {
  return address;
}
public void setAddress(String address) {
  this.address = address;
}
public void resetField() {
  this.username = null;
  this.productID = null;
  this.address = null;
}
}

3.action

StartAction.java

package com;

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 StartAction extends Action {

@Override
public ActionForward execute(ActionMapping mapping, ActionForm form,
   HttpServletRequest request, HttpServletResponse response)
   throws Exception {
  StepActionForm saf = (StepActionForm)form;
  saf.resetField();
  return mapping.findForward("success");
}
}

Step1Action.java,Step2Action.java,Step3Action.java,FinishAction.java都相同

package com;

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 Step1Action extends Action {

@Override
public ActionForward execute(ActionMapping mapping, ActionForm form,
   HttpServletRequest request, HttpServletResponse response)
   throws Exception {
  return mapping.findForward("success");
}
}

3.struts-config.xml

<?xml version="1.0" encoding="ISO-8859-1" ?>

<!DOCTYPE struts-config PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 1.2//EN"
"http://jakarta.apache.org/struts/dtds/struts-config_1_2.dtd">

<struts-config>

<form-beans>
  <form-bean name="stepForm" type="com.bjsxt.struts.StepActionForm"/>
</form-beans>

<action-mappings>
  <action path="/start"
    type="com.bjsxt.struts.StartAction"
    name="stepForm"
    scope="session"
  >
   <forward name="success" path="/step1.jsp"/>
  </action>

  <action path="/step1"
    type="com.bjsxt.struts.Step1Action"
    name="stepForm"
    scope="session"
  >
   <forward name="success" path="/step2.jsp"/>
  </action>