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Java/Struts 2.0

CSS Servlet Struts JSP HTML

import com.opensymphony.xwork2.ActionSupport;

public class SelectTestAction extends ActionSupport {
    private int city;
    private int country;

    public City[] getCities() {
        City[] cities = null;
        if (country == 1) {
            cities = new City[3];
            cities[0] = new City(1, "Atlanta");
            cities[1] = new City(2, "Chicago");
            cities[2] = new City(3, "Detroit");
        } else if (country == 2) {
            cities = new City[3];
            cities[0] = new City(4, "Vancouver");
            cities[1] = new City(5, "Toronto");
            cities[2] = new City(6, "Montreal");
            
        } else if (country == 3) {
            cities = new City[2];
            cities[0] = new City(7, "Mexico City");
            cities[1] = new City(8, "Tijuana");
        } else {
            cities = new City[0];
        }
        return cities;
    }
    public int getCity() {
        return city;
    }
    public void setCity(int city) {
        this.city = city;
    }
    
    public int getCountry() {
        return country;
    }
    public void setCountry(int country) {
        this.country = country;
    }
}

class City {
    private int id;
    private String name;
    public City(int id, String name) {
        this.id = id;
        this.name = name;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
}

ApplicationListener.java

import java.util.HashMap;
import java.util.Map;
import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

public class ApplicationListener 
        implements ServletContextListener {
    public void contextInitialized(ServletContextEvent cse) {
        Map<Integer, String> countries = 
                new HashMap<Integer, String>();
        countries.put(1, "US");
        countries.put(2, "Canada");
        countries.put(3, "Mexico");
        ServletContext servletContext = cse.getServletContext();
        servletContext.setAttribute("countries", countries);
    }
    public void contextDestroyed(ServletContextEvent cse) {
    }
}

select.jsp页面内容：

<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<title>select Tag Example</title>
<style type="text/css">@import url(css/main.css);</style>
</head>
<body>
<div id="global" style="width:300px">
	<h3>Select Location</h3>
	<s:form>
		<s:select name="country" label="Country" emptyOption="true"
				list="#application.countries" 
				onchange="this.form.submit()"
		/>
		<s:select name="city" label="City" 
				list="cities" listKey="id" listValue="name"
		/>
    	<s:submit/>

	</s:form>
</div>
</body>
</html>

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MailUtil 邮件发送工具类 | radio标签

2011-02-23 21:17
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