Пример раскрывающегося списка Spring MVC

//SimpleFormController
protected Map referenceData(HttpServletRequest request) throws Exception {
	Map referenceData = new HashMap();
	Map country = new LinkedHashMap();
	country.put("US", "United Stated");
	country.put("CHINA", "China");
	country.put("SG", "Singapore");
	country.put("MY", "Malaysia");
	referenceData.put("countryList", country);
}

   United Stated
   China
   Singapore
   Malaysia
 

   United Stated
   China
   Singapore
   Malaysia
 

   --- Select --- 
   United Stated
   China
   Singapore
   Malaysia
 

 
    United Stated
    China
    Singapore
    Malaysia 

 

package com.mkyong.customer.model;

public class Customer{

	String country;
	String javaSkills;
	
	public String getCountry() {
		return country;
	}
	public void setCountry(String country) {
		this.country = country;
	}
	public String getJavaSkills() {
		return javaSkills;
	}
	public void setJavaSkills(String javaSkills) {
		this.javaSkills = javaSkills;
	}	
}

package com.mkyong.customer.controller;

import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.validation.BindException;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.SimpleFormController;
import com.mkyong.customer.model.Customer;

public class DropDownBoxController extends SimpleFormController{
	
	public DropDownBoxController(){
		setCommandClass(Customer.class);
		setCommandName("customerForm");
	}
	
	@Override
	protected Object formBackingObject(HttpServletRequest request)
		throws Exception {
		
		Customer cust = new Customer();
		
		//make "Spring" as the default java skills selection
		cust.setJavaSkills("Spring");
		
		return cust;
		
	}
	
	@Override
	protected ModelAndView onSubmit(HttpServletRequest request,
		HttpServletResponse response, Object command, BindException errors)
		throws Exception {

		Customer customer = (Customer)command;
		return new ModelAndView("CustomerSuccess","customer",customer);
	
	}
	
	protected Map referenceData(HttpServletRequest request) throws Exception {
		
		Map referenceData = new HashMap();
		
		Map country = new LinkedHashMap();
		country.put("US", "United Stated");
		country.put("CHINA", "China");
		country.put("SG", "Singapore");
		country.put("MY", "Malaysia");
		referenceData.put("countryList", country);
		
		Map javaSkill = new LinkedHashMap();
		javaSkill.put("Hibernate", "Hibernate");
		javaSkill.put("Spring", "Spring");
		javaSkill.put("Apache Wicket", "Apache Wicket");
		javaSkill.put("Struts", "Struts");
		referenceData.put("javaSkillsList", javaSkill);
		
		return referenceData;
	}
}

package com.mkyong.customer.validator;

import org.springframework.validation.Errors;
import org.springframework.validation.ValidationUtils;
import org.springframework.validation.Validator;

import com.mkyong.customer.model.Customer;

public class DropDownBoxValidator implements Validator{

	@Override
	public boolean supports(Class clazz) {
	   //just validate the Customer instances
	   return Customer.class.isAssignableFrom(clazz);
	}

	@Override
	public void validate(Object target, Errors errors) {
		
	   Customer cust = (Customer)target;
	
	   ValidationUtils.rejectIfEmptyOrWhitespace(errors, "javaSkills", "required.javaSkills");
		
	   if("NONE".equals(cust.getCountry())){
		errors.rejectValue("country", "required.country");
	   }
	}
}

required.country = Please select a country!
required.javaSkills = Please select a java Skill!	

<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>






	
Spring's form select, option, options example

	
		
		


			

				
Country :
				

					  
					  
				       
                                
				

			
			

				
Java Skills :
				

				

			

			

				

			
		
	

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>



	
Spring's form select, option, options example

	Country : ${customer.country}
	
 Java Skills : ${customer.javaSkills}
	

  

	
		
		

		
		
			
		
	

	
	
		
	

	
		
			/WEB-INF/pages/
		
		
			.jsp