Springmvc 简明教程

Spring MVC - Password Example

以下示例介绍了如何在表单中使用密码以及 Spring Web MVC 框架。首先，让我们有一个正在工作的 Eclipse IDE，并遵循以下步骤使用 Spring Web 框架开发一个基于动态表单的 Web 应用程序。

The following example describes how to use Password in forms using the Spring Web MVC framework. To start with, let us have a working Eclipse IDE in place and adhere to the following steps to develop a Dynamic Form based Web Application using the Spring Web Framework.

Step

Description

1

Create a project with a name HelloWeb under a package com.tutorialspoint as explained in the Spring MVC - Hello World chapter.

2

Create Java classes User, UserController under the com.tutorialspointpackage.

3

Create view files user.jsp, users.jsp under jsp sub-folder.

4

The final step is to create the content of the source and configuration files and export the application as explained below.

User.java

package com.tutorialspoint;

public class User {

   private String username;
   private String password;

   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;
   }
}

UserController.java

package com.tutorialspoint;

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() {
      return new ModelAndView("user", "command", new User());
   }

   @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());

      return "users";
   }
}

这里，第一个服务方法 user() ，我们在 ModelAndView 对象中传递了一个空用户对象，名称为“command”，因为 Spring 框架期望一个名为“command”的对象，如果你在 JSP 文件中使用 <form:form> 标记。因此，当调用 user() 方法时，它返回 user.jsp 视图。

Here, the first service method user(), we have passed a blank User object in the ModelAndView object with name "command", because the spring framework expects an object with name "command", if you are using <form:form> tags in your JSP file. So, when the user() method is called it returns user.jsp view.

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模型对象。最后，从服务方法返回“users”视图，这将导致呈现 users.jsp。

The Second service method addUser() will be called against a POST method on the HelloWeb/addUser URL. You will prepare your model object based on the submitted information. Finally, the "users" view will be returned from the service method, which will result in rendering the 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 colspan = "2">
                  <input type = "submit" value = "Submit"/>
               </td>
            </tr>
         </table>
      </form:form>
   </body>
</html>

在此处，我们使用 <form:password /> 标记来呈现一个 HTML 密码框。例如 −

Here, we are using the <form:password /> tag to render an HTML password box. For example −

<form:password path = "password" />

它将呈现以下 HTML 内容。

It will render the following HTML content.

<input id = "password" name = "password" type = "password" value = ""/>

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>
      </table>
   </body>
</html>

完成源代码和配置文件的创建后，导出应用程序。右键单击应用程序，使用“导出 → WAR 文件”选项，并将 HelloWeb.war 文件保存在 Tomcat 的 webapps 文件夹中。

Once we are done with creating source and configuration files, export the application. Right click on your application, use Export → WAR File option and save your HelloWeb.war file in Tomcat’s webapps folder.

现在，启动 Tomcat 服务器，并确保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，我们将看到以下屏幕。

Now, start your Tomcat server and make sure you are able to access other webpages from the webapps folder using a standard browser. Try a URL –http://localhost:8080/HelloWeb/user and we will see the following screen if everything is fine with the Spring Web Application.

spring password

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。

After submitting the required information, click on the submit button to submit the form. We will see the following screen, if everything is fine with the Spring Web Application.

spring password result