Spring MVC - Contoh Listbox

Contoh berikut menunjukkan cara menggunakan Listbox dalam formulir menggunakan kerangka MVC Spring Web. Untuk memulai, mari kita memiliki IDE Eclipse yang berfungsi dan ikuti langkah-langkah selanjutnya untuk mengembangkan Aplikasi Web berbasis Formulir Dinamis menggunakan Spring Web Framework.

Langkah	Deskripsi
1	Buat proyek dengan nama HelloWeb di bawah paket com.tutorialspoint seperti yang dijelaskan dalam bab Spring MVC - Hello World.
2	Buat kelas Java User, UserController di bawah com.tutorialspointpackage.
3	Buat file tampilan user.jsp, users.jsp di bawah sub-folder jsp.
4	Langkah terakhir adalah membuat konten file sumber dan konfigurasi dan mengekspor aplikasi seperti yang dijelaskan di bawah ini.

User.java

package com.tutorialspoint;

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;
   private String [] skills;
   
   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;
   }
   public String[] getSkills() {
      return skills;
   }
   public void setSkills(String[] skills) {
      this.skills = skills;
   }
}

UserController.java

package com.tutorialspoint;

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());
      model.addAttribute("skills", user.getSkills());
      return "users";
   }
   
   @ModelAttribute("webFrameworkList")
   public List<String> getWebFrameworkList() {
      List<String> webFrameworkList = new ArrayList<String>();
      webFrameworkList.add("Spring MVC");
      webFrameworkList.add("Struts 1");
      webFrameworkList.add("Struts 2");
      webFrameworkList.add("Apache Wicket");
      return webFrameworkList;
   }
   
   @ModelAttribute("numbersList")
   public List<String> getNumbersList() {
      List<String> numbersList = new ArrayList<String>();
      numbersList.add("1");
      numbersList.add("2");
      numbersList.add("3");
      numbersList.add("4");
      return numbersList;
   }

   @ModelAttribute("countryList")
   public Map<String, String> getCountryList() {
      Map<String, String> countryList = new HashMap<String, String>();
      countryList.put("US", "United States");
      countryList.put("CH", "China");
      countryList.put("SG", "Singapore");
      countryList.put("MY", "Malaysia");
      return countryList;
   }
   
   @ModelAttribute("skillsList")
   public Map<String, String> getSkillsList() {
      Map<String, String> skillList = new HashMap<String, String>();
      skillList.put("Hibernate", "Hibernate");
      skillList.put("Spring", "Spring");
      skillList.put("Apache Wicket", "Apache Wicket");
      skillList.put("Struts", "Struts");
      return skillList;
   }
}

Di sini, untuk metode layanan pertama user(), kami telah melewati titik kosong Userobjek dalam objek ModelAndView dengan nama "perintah", karena kerangka pegas mengharapkan objek dengan nama "perintah", jika Anda menggunakan tag <form: form> dalam file JSP Anda. Jadi, saat fileuser() metode ini dipanggil, ia mengembalikan user.jsp melihat.

Metode layanan kedua addUser() akan dipanggil terhadap metode POST di HelloWeb/addUserURL. Anda akan mempersiapkan objek model Anda berdasarkan informasi yang dikirimkan. Terakhir, tampilan "pengguna" akan dikembalikan dari metode layanan, yang akan menghasilkan rendering users.jsp.

user.jsp

<%@taglib uri = "http://www.springframework.org/tags/form" prefix = "form"%>
<html>
   <head>
      <title>Spring MVC Form Handling</title>
   </head>
   <body>

      <h2>User Information</h2>
      <form:form method = "POST" action = "/HelloWeb/addUser">
         <table>
            <tr>
               <td><form:label path = "username">User Name</form:label></td>
               <td><form:input path = "username" /></td>
            </tr>
            <tr>
               <td><form:label path = "password">Age</form:label></td>
               <td><form:password path = "password" /></td>
            </tr>  
            <tr>
               <td><form:label path = "address">Address</form:label></td>
               <td><form:textarea path = "address" rows = "5" cols = "30" /></td>
            </tr>  
            <tr>
               <td><form:label path = "receivePaper">Subscribe Newsletter</form:label></td>
               <td><form:checkbox path = "receivePaper" /></td>
            </tr> 
            <tr>
               <td><form:label path = "favoriteFrameworks">Favorite Web Frameworks</form:label></td>
               <td><form:checkboxes items = "${webFrameworkList}" path = "favoriteFrameworks" /></td>       
            </tr>
            <tr>
               <td><form:label path = "gender">Gender</form:label></td>
               <td>
                  <form:radiobutton path = "gender" value = "M" label = "Male" />
                  <form:radiobutton path = "gender" value = "F" label = "Female" />
               </td>
            </tr>
            <tr>
               <td><form:label path = "favoriteNumber">Favorite Number</form:label></td>
               <td>
                  <form:radiobuttons path = "favoriteNumber" items = "${numbersList}" />        	
               </td>
            </tr>
            <tr>
               <td><form:label path = "country">Country</form:label></td>
               <td>
                  <form:select path = "country">
                     <form:option value = "NONE" label = "Select"/>
                     <form:options items = "${countryList}" />
                  </form:select>     	
               </td>
            </tr>  
            <tr>
               <td><form:label path = "skills">Skills</form:label></td>
               <td>
                  <form:select path = "skills" items = "${skillsList}"
                     multiple = "true" />
               </td>
            </tr>  	  
            <tr>
               <td colspan = "2">
                  <input type = "submit" value = "Submit"/>
               </td>
            </tr>
         </table>  
      </form:form>
   </body>
</html>

Di sini, kami menggunakan file <form:select /> tag, dengan atribut multiple=trueuntuk merender kotak daftar HTML. Misalnya -

<form:select path = "skills" items = "${skillsList}" multiple = "true" />

Ini akan membuat konten HTML berikut.

<select id = "skills" name = "skills" multiple = "multiple">
   <option value = "Struts">Struts</option>
   <option value = "Hibernate">Hibernate</option>
   <option value = "Apache Wicket">Apache Wicket</option>
   <option value = "Spring">Spring</option>
</select>
<input type = "hidden" name = "_skills" value = "1"/>

users.jsp

<%@taglib uri = "http://www.springframework.org/tags/form" prefix = "form"%>
<html>
   <head>
      <title>Spring MVC Form Handling</title>
   </head>
   <body>

      <h2>Submitted User Information</h2>
      <table>
         <tr>
            <td>Username</td>
            <td>${username}</td>
         </tr>
         <tr>
            <td>Password</td>
            <td>${password}</td>
         </tr>    
         <tr>
            <td>Address</td>
            <td>${address}</td>
         </tr>  
         <tr>
            <td>Subscribed to Newsletter</td>
            <td>${receivePaper}</td>
         </tr>    
         <tr>
            <td>Favorite Web Frameworks</td>
            <td> <% String[] favoriteFrameworks = (String[])request.getAttribute("favoriteFrameworks");
               for(String framework: favoriteFrameworks) {
                  out.println(framework);
               }
            %></td>
         </tr>     	 
         <tr>
            <td>Gender</td>
            <td>${(gender=="M"? "Male" : "Female")}</td>
         </tr>
         <tr>
            <td>Favourite Number</td>
            <td>${favoriteNumber}</td>
         </tr>   
         <tr>
            <td>Country</td>
            <td>${country}</td>
         </tr>
         <tr>
            <td>Skills</td>
            <td> <% String[] skills = (String[])request.getAttribute("skills");
            for(String skill: skills) {
               out.println(skill);
            }
            %></td>
         </tr>   	  
      </table>  
   </body>
</html>

Setelah Anda selesai membuat file sumber dan konfigurasi, ekspor aplikasi Anda. Klik kanan pada aplikasi Anda, gunakanExport → WAR File opsi dan simpan file HelloWeb.war di folder webapps Tomcat.

Sekarang, jalankan server Tomcat dan pastikan Anda dapat mengakses halaman web lain dari folder webapps menggunakan browser standar. Coba URL -http://localhost:8080/HelloWeb/user dan kita akan melihat layar berikut, jika semuanya baik-baik saja dengan Aplikasi Web Spring.

Setelah mengirimkan informasi yang diperlukan, klik tombol kirim untuk mengirimkan formulir. Anda harus melihat layar berikut, jika semuanya baik-baik saja dengan Aplikasi Web Spring Anda.