Springmvc 简明教程

Spring MVC - RadioButton Example

以下示例演示了如何在使用 Spring Web MVC 框架的表单中使用单选按钮。首先，我们提供一个正在运行的 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 −

Step

Description

1

按照 Spring MVC - Hello World 章节中的说明，使用 com.tutorialspoint 作为包，创建一个名为 HelloWeb 的项目。

2

在 com.tutorialspointpackage 下创建 Java 类 User 和 UserController。

3

在 jsp 子文件夹下创建视图文件 user.jsp 和 users.jsp。

4

最后一步是创建源文件和配置文件的内容，然后按如下所述导出应用程序。

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;

   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

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 对象中传递了一个空白 User 对象，名称为“command”，因为如果您在 JSP 文件中使用 <form:form> 标记，Spring 框架需要名称为“command”的对象。所以当调用 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 方法进行调用。你将根据提交的信息准备你的模型对象。最后，将在服务方法中返回“users”视图，这会导致呈现 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 colspan = "2">
                  <input type = "submit" value = "Submit"/>
               </td>
            </tr>
         </table>
      </form:form>
   </body>
</html>

这里我们使用 <form:radiobutton /> 标记来呈现 HTML 单选按钮。

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

它会呈现以下 HTML 内容。

<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

<%@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>

一旦创建完源文件和配置文件，导出您的应用程序。右键单击应用程序，使用 Export → WAR File 选项，并将 HelloWeb.war 文件保存到 Tomcat 的 webapps 文件夹中。

现在，启动 Tomcat 服务器，确保您能够使用标准浏览器从 webapps 文件夹访问其他网页。尝试一个 URL – http://localhost:8080/HelloWeb/user ，如果 Spring Web 应用程序一切正常，我们将会看到以下屏幕。

spring radiobutton

在提交所需信息后，单击“submit”按钮提交表单。如果 Spring Web 应用程序一切正常，我们将会看到以下屏幕。

spring radiobutton result