Spring MVC - RadioButton 单选按钮示例

以下示例展示了如何使用 Spring Web MVC 框架在表单中使用 RadioButton。首先，让我们有一个可以工作的 Eclipse IDE，并按照以下步骤使用 Spring Web 框架开发基于动态表单的 Web 应用程序 −

步骤	说明
1	在包 com.tutorialspoint 下创建一个名称为 HelloWeb 的项目，如 Spring MVC - Hello World 一章中所述。
2	在 com.tutorialspoint 包下创建 Java 类 User、UserController。
3	在jsp子文件夹下创建视图文件user.jsp、users.jsp。
4	最后一步是创建源文件和配置文件的内容并导出应用程序，如下所述。

User.java

实例


package com.tutorialspoint;

public class User {
	
   private String username;
   private String password;
   private String address;
   private boolean receivePaper;
   private String [] favoriteFrameworks;   
   private String gender;
   
   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;
   }
}

UserController.java

实例


package com.tutorialspoint;

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

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());
      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;
   }
}

这里，第一个服务方法user()，我们在ModelAndView对象中传入了一个空白的User对象，名称为 "command"，因为spring框架需要一个名称为 "command" 的对象，如果您在 JSP 文件中使用 <form:form> 标签。因此，当调用 user() 方法时，它会返回 user.jsp 视图。

第二个服务方法 addUser() 将针对 HelloWeb/addUser URL 上的 POST 方法调用。您将根据提交的信息准备模型对象。最后，“users”视图将从服务方法返回，这将导致呈现 users.jsp。

user.jsp

实例


<%@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 colspan = "2">
                  <input type = "submit" value = "Submit"/>
               </td>
            </tr>
         </table>  
      </form:form>
   </body>
</html>

在这里，我们使用 <form:radiobutton /> 标签来呈现 HTML 单选按钮。

实例


<form:radiobutton path = "gender" value = "M" label = "Male" />
<form:radiobutton path = "gender" value = "F" label = "Female" />

它将呈现以下 HTML 内容。

实例


<input id = "gender1" name = "gender" type = "radio" value = "M" checked = "checked"/><label for = "gender1">Male</label>
<input id = "gender2" name = "gender" type = "radio" value = "F"/><label for = "gender2">Female</label>

users.jsp

实例


<%@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>    	  
      </table>  
   </body>
</html>

完成创建源文件和配置文件后，导出您的应用程序。右键单击您的应用程序，使用 Export → WAR File 选项并将 HelloWeb.war 文件保存在 Tomcat 的 webapps 文件夹中。

现在，启动您的 Tomcat 服务器并确保您能够使用标准浏览器从 webapps 文件夹访问其他网页。尝试以下 URL - http://localhost:8080/HelloWeb/user 如果您的 Spring Web 应用程序一切正常，我们将看到以下屏幕。