Spring MVC 表单文本字段

Spring MVC 表单文本字段标签生成使用绑定值的 HTML 输入标签。默认情况下，输入标签的类型是文本。

语法

<form:input path="name" />

这里，path 属性将表单字段绑定到 Bean 属性。

Spring MVC 表单标签库还提供其他输入类型，如电子邮件、日期、电话等。

对于电子邮件：

<form:input type="email" path="email" />

对于日期：

<form:input type="date" path="date" />

Spring MVC 表单文本字段示例让我们看一个使用表单标签库创建火车预订表单的示例。

在 pom.xml 文件中添加依赖项。

          <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->  
<dependency>  
    <groupId>org.springframework</groupId>  
    <artifactId>spring-webmvc</artifactId>  
    <version>5.1.1.RELEASE</version>  
</dependency>  
  
    <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->  
<dependency>    
    <groupId>javax.servlet</groupId>    
    <artifactId>servlet-api</artifactId>    
    <version>3.0-alpha-1</version>    
</dependency>  
  
    <!-- https://mvnrepository.com/artifact/javax.servlet/jstl -->  
<dependency>  
    <groupId>javax.servlet</groupId>  
    <artifactId>jstl</artifactId>  
    <version>1.2</version>  
</dependency>  
<!-- https://mvnrepository.com/artifact/org.apache.tomcat/tomcat-jasper -->  
<dependency>  
    <groupId>org.apache.tomcat</groupId>  
    <artifactId>tomcat-jasper</artifactId>  
    <version>9.0.12</version>  
</dependency>

2.创建 Bean 类这里，Bean 类包含与表单中的输入字段对应的变量（以及设置器和获取器方法）。

Reservation.java

package cn.javatiku;  
  
public class Reservation {  
  
    private String firstName;  
    private String lastName;  
      
    public Reservation()  
    {         
    }  
    public String getFirstName() {  
        return firstName;  
    }  
    public void setFirstName(String firstName) {  
        this.firstName = firstName;  
    }  
    public String getLastName() {  
        return lastName;  
    }  
    public void setLastName(String lastName) {  
        this.lastName = lastName;  
    }     
}

创建控制器类 ReservationController.java

package cn.javatiku;  
import org.springframework.stereotype.Controller;  
import org.springframework.ui.Model;  
import org.springframework.web.bind.annotation.ModelAttribute;  
import org.springframework.web.bind.annotation.RequestMapping;  
  
@RequestMapping("/reservation")  
@Controller  
public class ReservationController {  
    @RequestMapping("/bookingForm")  
public String bookingForm(Model model)  
{  
      //create a reservation object   
    Reservation res=new Reservation();  
      //provide reservation object to the model   
    model.addAttribute("reservation", res);  
    return "reservation-page";  
}  
@RequestMapping("/submitForm")  
// @ModelAttribute binds form data to the object  
public String submitForm(@ModelAttribute("reservation") Reservation res)  
{  
    return "confirmation-form";  
}  
}

在 web.xml 文件中提供控制器的入口

web.xml

<?xml version="1.0" encoding="UTF-8"?>  
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">  
  <display-name>SpringMVC</display-name>  
   <servlet>    
    <servlet-name>spring</servlet-name>    
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>    
    <load-on-startup>1</load-on-startup>      
</servlet>    
<servlet-mapping>    
    <servlet-name>spring</servlet-name>    
    <url-pattern>/</url-pattern>    
</servlet-mapping>    
</web-app>

在 xml 文件中定义 Bean

spring-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>  
<beans xmlns="http://www.springframework.org/schema/beans"  
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"   
    xmlns:context="http://www.springframework.org/schema/context"  
    xmlns:mvc="http://www.springframework.org/schema/mvc"  
    xsi:schemaLocation="  
        http://www.springframework.org/schema/beans  
        http://www.springframework.org/schema/beans/spring-beans.xsd  
        http://www.springframework.org/schema/context  
        http://www.springframework.org/schema/context/spring-context.xsd  
        http://www.springframework.org/schema/mvc  
        http://www.springframework.org/schema/mvc/spring-mvc.xsd">  
    <!-- Provide support for component scanning -->  
    <context:component-scan base-package="cn.javatiku" />  
    <!--Provide support for conversion, formatting and validation -->  
    <mvc:annotation-driven/>  
    <!-- Define Spring MVC view resolver -->  
     <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">  
        <property name="prefix" value="/WEB-INF/jsp/"></property>  
        <property name="suffix" value=".jsp"></property>       
     </bean>  
</beans>

创建所需的页面

index.jsp

<!DOCTYPE html>  
<html>  
<head>  
    <title>Railway Registration Form</title>  
</head>  
<body>  
<a href="reservation/bookingForm">Click here for reservation.</a>  
</body>  
</html>

创建其他视图组件

reservation-page.jsp

<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>  
<!DOCTYPE html>  
<html>  
<head>  
    <title>Reservation Form</title>  
</head>  
<h3>Railway Reservation Form</h3>  
<body>  
    <form:form action="submitForm" modelAttribute="reservation">  
        First name: <form:input path="firstName" />         
        <br><br>  
        Last name: <form:input path="lastName" />  
        <br><br>  
        <input type="submit" value="Submit" />      
    </form:form>  
</body>  
</html>

注意 - 通过 @ModelAttribute 注解传递的值应与视图页面中的 modelAttribute 值相同。
confirmation-page.jsp

<!DOCTYPE html>  
<html>  
<body>  
<p>Your reservation is confirmed successfully. Please, re-check the details.</p>  
First Name : ${reservation.firstName} <br>  
Last Name : ${reservation.lastName}  
</body>  
</html>

输出：（这里显示了表单和确认页面的内容）

以上就是使用 Spring MVC 表单标签库创建火车预订表单的示例。

Spring教程-Spring MVC 表单文本字段

Spring MVC 表单文本字段

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