Struts 处理表单跨页

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前言：有时，表单数据太多，无法在同一个页面显示，需要分页完成（如用户注册表单）。这时，既可以为每一个表单创建一个ActionForm，也可以只创建一个ActionForm，它和多个表单对应。

这里我们把注册表单拆分为两个表单：第一个在insertContent.jsp中定义，包括name和phone字段，第二个表单在insertContent_next.jsp中定义，包括address字段。

1. 把HTML表单拆分到多个JSP页面中

insertContent.jsp

<%@ page contentType="text/html;charset=gb2312" language="java"%>

<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean"%>

<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html"%>

<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html:html>

<head>

<html:base />

</head>

<body>

<html:errors />

<html:form action="/insert1.do" focus="title">

<html:hidden property="page" value="1" />

<!—- 定义一个隐含字段，它代表当前页面编号，AcitonForm将通过这个字段来识别当前正在处理的是哪个表单。 -->

<tr>

<bean:message key="prompt.name" />

</td>

<td>

<html:text property="name" size="25" maxlength="25" />

</td>

</tr>

<tr>

<bean:message key="prompt.phone" />

</td>

<td>

<html:text property="phone" size="25" maxlength="10" />

</td>

</tr>

<tr>

<html:submit property="submit" value="next">

<bean:message key="button.next" />

</html:submit>

</td>

<html:reset>

<bean:message key="button.reset" />

</html:reset>

</td>

</tr>

</table>

</center>

</html:form>

</body>

</html:html>

insertContent_next.jsp

<%@ page contentType="text/html;charset=gb2312" language="java"%>

<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean"%>

<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html"%>

<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html:html>

<head>

<html:base />

</head>

<body>

<html:errors />

<html:form action="/insert2.do" focus="title">

<html:hidden property="page" value="2" />

<tr>

<bean:message key="prompt.address" />

</td>

<td>

<html:text property="address" size="25" maxlength="50" />

</td>

</tr>

<tr>

<html:submit property="submit">

<bean:message key="button.insert" />

</html:submit>

</td>

<html:reset>

<bean:message key="button.reset" />

</html:reset>

</td>

</tr>

</table>

</center>

</html:form>

</body>

</html:html>

以上两个表单分别对应不同的Action: “/insert1”和“/insert2”，但是这两个Action与同一个ActionForm映射。

2．创建和多个HTML表单对应的ActionForm（InsertForm.java）

package forms;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts.action.ActionMessage;

import org.apache.struts.action.ActionErrors;

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionMapping;

/**

* <strong>InsertForm</strong> handles the form that the user will use to

* insert a new Address into the database.

public final class InsertForm extends ActionForm {

private String name = null;

private String phone = null;

private String address = null;

private String page = null;

public String getName() {

return name;

}

public String getPhone() {

return phone;

}

public String getAddress() {

return address;

}

public String getPage() {

return page;

}

//根据“page”的值处理不同的字段

public void reset(ActionMapping mapping, HttpServletRequest request) {

int numPage = 0;

try {

numPage = new Integer(request.getParameter("page")).intValue();

} catch (Exception e) {

}

if (numPage == 1) {

name = null;

phone = null;

}

if (numPage == 2) {

address = null;

}

page = null;

}

public void setName(String name) {

this.name = name;

}

public void setPhone(String phone) {

this.phone = phone;

}

public void setAddress(String address) {

this.address = address;

}

public void setPage(String page) {

this.page = page;

}

public ActionErrors validate(ActionMapping mapping,

HttpServletRequest request) {

ActionErrors errors = new ActionErrors();

int numPage = 0;

try {

numPage = new Integer(page).intValue();

} catch (Exception e) {

}

if (numPage == 1) {

if (((name == null) || (name.length() < 1)))

errors.add("name", new ActionMessage("error.name.required"));

if (((phone == null) || (phone.length() < 1)))

errors.add("phone", new ActionMessage("error.phone.required"));

}

if (numPage == 2) {

if (((address == null) || (address.length() < 1)))

errors.add("address", new ActionMessage(

"error.address.required"));

}

return errors;

}

3．配置ActionForm和多个Action映射

struts-config.xml

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

<!DOCTYPE struts-config PUBLIC

"-//Apache Software Foundation//DTD Struts Configuration 1.1//EN"

"http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd">

<struts-config>

<form-beans>

<form-bean name="insertForm"

type="forms.InsertForm"/>

</form-beans>

<global-forwards>

</global-forwards>

<action-mappings>

<action path="/insert1"

parameter="/insertContent_next.jsp"

type="org.apache.struts.actions.ForwardAction"

name="insertForm"

scope="session"

input="/insertContent.jsp"

validate="true">

</action>

<action path="/insert2"

type="actions.InsertAction"

name="insertForm"

scope="session"

input="/insertContent_next.jsp"

validate="true">

</action>

</action-mappings>

<message-resources parameter="ApplicationResources"/>

</struts-config>