Struts标签学习(三)-html标签

        在早期jsp的开发中会用到大量的Scriptlet代码，这样造成了jsp页面维护性和可读性的下降，而Struts所带的标签库在一定程度上解决了此问题，所以我们提倡使用标签而不是用Scriptlet。

三、html标签
    html标签种类很多，而且也没有什么难度，常用的有
    <html:form>
    <html:text>
    <html:password>
    <html:textarea>
    <html:submit>
    <html:reset>
    <html:button>
    <html:select>
    <html:option>
    <html:radio>
    <html:checkbox>

    着重介绍几个需要注意的标签
1.<html:radio>
    a.创建jsp文件

<%@ page language="java" pageEncoding="utf-8"%>

<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %>

<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>

<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>

<%@ taglib uri="http://struts.apache.org/tags-tiles" prefix="tiles" %>

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

<html:html lang="true">

<head>

</head>

<body>

<html:form action="test.do" method="post">

Male<html:radio property="gender" value="male"></html:radio>

Female<html:radio property="gender" value="female"></html:radio><br>

<html:submit></html:submit>

</html:form>

</body>

</html:html>

b.创建ActionForm 与 Action
TestForm中唯一的属性就是gender

package com.yourcompany.struts.form;

import org.apache.struts.action.ActionForm;

public class TestForm extends ActionForm {

private String gender ;

public String getGender() {

return gender;

}

public void setGender(String gender) {

this.gender = gender;

}

TestAction中只打印gender

package com.yourcompany.struts.action;

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 com.yourcompany.struts.form.TestForm;

public class TestAction extends Action {

public ActionForward execute(ActionMapping mapping, ActionForm form,

HttpServletRequest request, HttpServletResponse response) {

TestForm testForm = (TestForm) form;// TODO Auto-generated method stub

System.out.println(testForm.getGender());

return null;

}

c.配置struts-config.xml文件

<?xml version="1.0" encoding="UTF-8"?>

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

<struts-config>

<data-sources />

<form-beans >

<form-bean name="testForm" type="com.yourcompany.struts.form.TestForm" />

</form-beans>

<global-exceptions />

<global-forwards />

<action-mappings >

<action

attribute="testForm"

input="/form/test.jsp"

name="testForm"

path="/test"

scope="request"

type="com.yourcompany.struts.action.TestAction" />

</action-mappings>

<message-resources parameter="com.yourcompany.struts.ApplicationResources" />

</struts-config>

很简单但是有时我们需要radio有默认值
解决方法只需要在TestForm中的

private String gender;

修改成

private String gender = "male";

那么 gender的默认值就是 male了

2.<html:select>与<html:option>
a.创建jsp文件

<%@ page language="java" pageEncoding="utf-8"%>

<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %>

<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>

<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>

<%@ taglib uri="http://struts.apache.org/tags-tiles" prefix="tiles" %>

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

<html:html lang="true">

<head>

</head>

<body>

<html:form action="test.do" method="post">

配件：<html:select property="part">

<html:option value="cup">CUP</html:option>

<html:option value="motherboard">主板</html:option>

<html:option value="momery">内存</html:option>

<html:option value="cdrom">光驱</html:option>

<html:option value="monitor">显示屏</html:option>

</html:select>

<html:submit value="submit"/>

</html:form>

</body>

</html:html>

b.创建ActionForm 和 Action
TestForm中唯一的属性就是part

package com.yourcompany.struts.form;

import org.apache.struts.action.ActionForm;

public class TestForm extends ActionForm {

private String part;

public String getPart() {

return part;

}

public void setPart(String part) {

this.part = part;

}

TestAction中只打印part

package com.yourcompany.struts.action;

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 com.yourcompany.struts.form.TestForm;

public class TestAction extends Action {

public ActionForward execute(ActionMapping mapping, ActionForm form,

HttpServletRequest request, HttpServletResponse response) {

TestForm testForm = (TestForm) form;// TODO Auto-generated method stub

System.out.println(testForm.getPart());

return null;

}

c.struts-config.xml文件不变

还是很简单的一个例子同样有时我们需要select有默认值
解决方法只需要在TestForm中的

private String part;

修改成

private String part = "motherboard";

那么 part的默认值就是主板了

每天进步一点点

posted on 2008-08-12 17:40 应越阅读(404) 评论(0) 编辑收藏所属分类: struts学习

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