以下示例说明如何使用Spring Web MVC框架在表单中使用TextArea.首先,让我们使用一个有效的Eclipse IDE,然后按照后续步骤使用Spring Web Framework开发基于动态表单的Web应用程序.
Step | 描述 |
---|---|
1 | 在com.it1352包下创建一个名为HelloWeb的项目,如Spring所述MVC : Hello World章节. |
2 | 创建Java类用户,com.it1352包下的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. |
package com.it1352; public class User { private String username; private String password; private String address; 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; } }
package com.it1352; 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()); model.addAttribute("address", user.getAddress()); return "users"; } }
这里,对于第一个服务方法user(),我们在ModelAndView对象中传递了一个空白的User对象使用名称"command",因为spring框架需要一个名为"command"的对象,如果你使用< form:form> JSP文件中的标记.因此,当调用user()方法时,它返回user.jsp视图.
将针对HelloWeb/addUser URL上的POST方法调用第二个服务方法addUser() .您将根据提交的信息准备模型对象.最后,将从service方法返回"users"视图,这将导致呈现users.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 colspan = "2"> <input type = "submit" value = "Submit"/> </td> </tr> </table> </form:form> </body> </html>
在这里,我们使用< form:textarea/> 标记来呈现HTML textarea框.例如 :
<form:textarea path = "address" rows = "5" cols = "30" />
它将呈现以下HTML内容.
<textarea id = "address" name = "address" rows = "5" cols = "30"></textarea>
<%@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> </table> </body> </html>
完成创建源文件和配置文件后,导出应用程序.右键单击您的应用程序,使用Export → WAR文件选项并将您的HelloWeb.war文件保存在Tomcat的webapps文件夹中.
现在,启动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.尝试使用URL -http://localhost:8080/HelloWeb/user,如果Spring Web Application的一切正常,我们将看到以下屏幕.
提交所需信息后,单击"提交"按钮提交表单.如果Spring Web Application的一切正常,我们将看到以下屏幕.