Struts2 <s:radio>单选按钮例子

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2023-03-14

在Struts2，可以使用<s:radio>标签来创建一个HTML单选按钮。有很多方法来填充数据到单选按钮，可以通过List, OGNL 或 Object。请查看下面的例子就知道了。

Struts2 <s:radio> 示例

举个例子来说明如何使用列表，OGNL和对象数据填充到Struts2中，使用<s:radio>标签创建一个单选按钮。

1. 动作 - Action

Action类来创建性别和语言值单选按钮列表。

RadioButtonAction.java

package com.yiibai.common.action;

import java.util.ArrayList;
import java.util.List;

import com.yiibai.common.model.Language;
import com.opensymphony.xwork2.ActionSupport;

public class RadioButtonAction extends ActionSupport{

	private List<String> genders;
	private List<Language> languages ;
	
	private String yourGender;
	private String yourAnswer;
	private String yourLanguage;
	
	private static final String MALE = "male";
	private static final String FEMALE = "female";
	private static final String UNKNOWN = "unknown";
	
	public RadioButtonAction(){
		
		genders = new ArrayList<String>();
		genders.add(MALE);
		genders.add(FEMALE);
		genders.add(UNKNOWN);
		
		languages = new ArrayList<Language>();
		languages.add( new Language("EN", "English") );
		languages.add( new Language("FR", "France") );
		languages.add( new Language("CN_ZH", "Chinese") );
		languages.add( new Language("DE", "German") );
		
	}
	
	//return default gender value
	public String getDefaultGenderValue(){
		return UNKNOWN;
	}

	//return default language value
	public String getDefaultLanguageValue(){
		return "CN_ZH";
	}
	
	public String execute() {
		return SUCCESS;
	}
	public String display() {
		return NONE;
	}
	
	//getter ad setter methods
}

Language.java

package com.yiibai.common.model;

public class Language{

	private String languageCode;
	private String languageDisplay;
	
	public String getLanguageCode() {
		return languageCode;
	}
	public void setLanguageCode(String languageCode) {
		this.languageCode = languageCode;
	}
	public String getLanguageDisplay() {
		return languageDisplay;
	}
	public void setLanguageDisplay(String languageDisplay) {
		this.languageDisplay = languageDisplay;
	}
	
	public Language(String languageCode, String languageDisplay) {
		this.languageCode = languageCode;
		this.languageDisplay = languageDisplay;
	}
}

2. 结果页面

结果页面是使用Struts2 “s:radio” 通过List, OGNL 和 object来创建的三个单选按钮。

radiobutton.jsp

<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
</head>

<body>
<h1>Struts 2 radio button example</h1>

<s:form action="resultAction" namespace="/">

<h2>
  <s:radio label="Gender" name="yourGender" list="genders" value="defaultGenderValue" />
  <s:radio label="Gender" name="yourLanguage" list="languages" 
      listKey="languageCode" listValue="languageDisplay" value="defaultLanguageValue" />
  <s:radio label="Answer" name="yourAnswer" list="#{'1':'Yes','2':'No'}" value="2" />
</h2> 

<s:submit value="submit" name="submit" />
	
</s:form>

</body>
</html>a

result.jsp

<%@ taglib prefix="s" uri="/struts-tags" %>
<html>

<body>
<h1>Struts 2 radio button example</h1>

<h2>
  Your Selected Gender : <s:property value="yourGender"/>
</h2> 
<h2>
  Your Selected Language : <s:property value="yourLanguage"/>
</h2> 
<h2>
  Your Selected Answer : <s:property value="yourAnswer"/>
</h2> 

</body>
</html>

3. struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
 
<struts>

<constant name="struts.devMode" value="true" />
 	
  <package name="com.yiibai.common.action" namespace="/" extends="struts-default">
		
    <action name="radioButtonAction" 
         class="com.yiibai.common.action.RadioButtonAction" method="display">
		<result name="none">/pages/radiobutton.jsp</result>
    </action>
		
    <action name="resultAction" class="com.yiibai.common.action.RadioButtonAction">
		<result name="success">/pages/result.jsp</result>
    </action>
  </package>
	
</struts>

5. 示例

http://localhost:8080/struts2radio/radioButtonAction.action

http://localhost:8080/struts2radio/resultAction.action

要了解如何预选值，读这篇文章 – 在Struts2的单选按钮预选值

参数

http://struts.apache.org/2.0.11.2/docs/radio.html
http://struts.apache.org/2.1.8.1/docs/struts-2-form-tags.html