SpringMVC 项目表单处理
本篇我们继续介绍SpringMVC 项目示例,利用我们在 第一个 SpringMVC 项目 这篇文章中创建的HelloWeb项目,继续介绍 SpringMVC 表单的处理。
下面我们直接上代码
在包 com.jiyik 中新建 Student.java
Student.java
package com.jiyik; public class Student { private Integer age; private String name; private Integer id; public void setAge(Integer age) { this.age = age; } public Integer getAge() { return age; } public void setName(String name) { this.name = name; } public String getName() { return name; } public void setId(Integer id) { this.id = id; } public Integer getId() { return id; } }
然后我们再创建 StudentController.java
StudentController.java
package com.jiyik; 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 StudentController { @RequestMapping(value = "/student", method = RequestMethod.GET) public ModelAndView student() { return new ModelAndView("student", "command", new Student()); } @RequestMapping(value = "/addStudent", method = RequestMethod.POST) public String addStudent(@ModelAttribute("SpringWeb")Student student, ModelMap model) { model.addAttribute("name", student.getName()); model.addAttribute("age", student.getAge()); model.addAttribute("id", student.getId()); return "result"; } }
在这里,第一个 service 方法 student(),我们已经在名称为 “command” 的 ModelAndView 对象中传递一个空的 Student 对象,因为 spring 框架需要一个名称的 “command” 的对象,如果你在 JSP 文件中使用 <form:form> 标签。所以,当 student() 方法被调用时,它返回 student.jsp 视图。
第二个 service 方法 addStudent() 将针对 HelloWeb/addStudent URL 上的 POST 方法调用。 将根据提交的信息准备模型对象。 最后,service 方法会返回一个“result”视图,这将会渲染 result.jsp
以下是Spring Web配置文件web.xml的内容
web.xml
<web-app id = "WebApp_ID" version = "2.4" xmlns = "http://java.sun.com/xml/ns/j2ee" xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation = "http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <display-name>Spring MVC Form Handling</display-name> <servlet> <servlet-name>HelloWeb</servlet-name> <servlet-class> org.springframework.web.servlet.DispatcherServlet </servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>HelloWeb</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
以下是另一个 Spring Web 配置文件 HelloWeb-servlet.xml 的内容
HelloWeb-servlet.xml
<beans xmlns = "http://www.springframework.org/schema/beans" xmlns:context = "http://www.springframework.org/schema/context" xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation = "http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"> <context:component-scan base-package = "com.jiyik" /> <bean class = "org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name = "prefix" value = "/WEB-INF/jsp/" /> <property name = "suffix" value = ".jsp" /> </bean> </beans>
以下是Spring视图文件student.jsp的内容
student.jsp
<%@taglib uri = "http://www.springframework.org/tags/form" prefix = "form"%> <html> <head> <title>Spring MVC 表单处理</title> </head> <body> <h2>Student Information</h2> <form:form method = "POST" action = "/HelloWeb/addStudent"> <table> <tr> <td><form:label path = "name">Name</form:label></td> <td><form:input path = "name" /></td> </tr> <tr> <td><form:label path = "age">Age</form:label></td> <td><form:input path = "age" /></td> </tr> <tr> <td><form:label path = "id">id</form:label></td> <td><form:input path = "id" /></td> </tr> <tr> <td colspan = "2"> <input type = "submit" value = "Submit"/> </td> </tr> </table> </form:form> </body> </html>
然后新建 result.jsp 文件,代码如下
result.jsp
<%@page contentType = "text/html;charset = UTF-8" language = "java" %> <%@page isELIgnored = "false" %> <%@taglib uri = "http://www.springframework.org/tags/form" prefix = "form"%> <html> <head> <title>Spring MVC 表单处理</title> </head> <body> <h2>Submitted Student Information</h2> <table> <tr> <td>Name</td> <td>${name}</td> </tr> <tr> <td>Age</td> <td>${age}</td> </tr> <tr> <td>ID</td> <td>${id}</td> </tr> </table> </body> </html>
现在启动 Tomcat 服务器并确保你能够使用标准浏览器从 webapps 文件夹访问其他网页。
现在尝试访问 URL http://localhost:8080/SpringWeb/student
,如果 Spring Web 应用程序一切正常,应该会看到以下结果。