以下示例显示如何在使用Spring Web MVC框架的表单中使用下拉选项(Dropdown)。首先使用Eclipse IDE来创建一个WEB工程，实现一个让用户可选择自己所在的国家的功能。并按照以下步骤使用Spring Web Framework开发基于动态表单的Web应用程序：
- 创建一个名称为 Dropdown 的动态WEB项目。
- 在
com.yiibai.springmvc包下创建两个Java类User，UserController。 - 在
jsp子文件夹下创建两个视图文件：user.jsp，userlist.jsp。 - 最后一步是创建所有源和配置文件的内容并运行应用程序，详细如下所述。
完整的项目文件目录结构如下所示 -
User.java 的代码如下所示 -
package com.yiibai.springmvc;
public class User {
private String username;
private String password;
private String address;
private boolean receivePaper;
private String [] favoriteFrameworks;
private String gender;
private String favoriteNumber;
private String country;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public boolean isReceivePaper() {
return receivePaper;
}
public void setReceivePaper(boolean receivePaper) {
this.receivePaper = receivePaper;
}
public String[] getFavoriteFrameworks() {
return favoriteFrameworks;
}
public void setFavoriteFrameworks(String[] favoriteFrameworks) {
this.favoriteFrameworks = favoriteFrameworks;
}
public String getGender() {
return gender;
}
public void setGender(String gender) {
this.gender = gender;
}
public String getFavoriteNumber() {
return favoriteNumber;
}
public void setFavoriteNumber(String favoriteNumber) {
this.favoriteNumber = favoriteNumber;
}
public String getCountry() {
return country;
}
public void setCountry(String country) {
this.country = country;
}
}
UserController.java 的代码如下所示 -
package com.yiibai.springmvc;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.ui.ModelMap;
@Controller
public class UserController {
@RequestMapping(value = "/user", method = RequestMethod.GET)
public ModelAndView user() {
User user = new User();
user.setFavoriteFrameworks((new String []{"Spring MVC","Struts 2"}));
user.setGender("M");
ModelAndView modelAndView = new ModelAndView("user", "command", user);
return modelAndView;
}
@RequestMapping(value = "/addUser", method = RequestMethod.POST)
public String addUser(@ModelAttribute("SpringWeb")User user,
ModelMap model) {
model.addAttribute("username", user.getUsername());
model.addAttribute("password", user.getPassword());
model.addAttribute("address", user.getAddress());
model.addAttribute("receivePaper", user.isReceivePaper());
model.addAttribute("favoriteFrameworks", user.getFavoriteFrameworks());
model.addAttribute("gender", user.getGender());
model.addAttribute("favoriteNumber", user.getFavoriteNumber());
model.addAttribute("country", user.getCountry());
return "userlist";
}
@ModelAttribute("webFrameworkList")
public List<String> getWebFrameworkList()
{
List<String> webFrameworkList = new ArrayList<String