Spring MVC表单复选框用法示例 _SpringMVC

Spring MVC表单复选框有助于同时选择多个选项。该标签呈现类型为checkbox的HTML输入标签。
句法

< form:checkbox path="abc" value="http://www.srcmini.com/element"/>

除了复选框标签之外, Spring MVC表单标签库还包含复选框标签。该标签呈现带有类型复选框的多个HTML输入标签。仅当你不想列出视图页面中的所有元素时才使用此标记。在这种情况下, 你可以在运行时提供元素并将其传递给标签。由于用户可以选择多个选项, 因此你需要传递Array, List或Map类型的元素。
句法

< form:checkboxes path="abc" items="${object.elementList}"/>

Spring MVC表单复选框的示例 1.将依赖项添加到pom.xml文件。

< !-- 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
Reservation.java

package com.srcmini; public class Reservation { private String firstName; private String lastName; private String Gender; private String[] Food; 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; } public String getGender() {return Gender; } public void setGender(String gender) {Gender = gender; } public String[] getFood() {return Food; } public void setFood(String[] food) {Food = food; }}

3.创建控制器类
【Spring MVC表单复选框用法示例】ReservationController.java

package com.srcmini; 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")@Controllerpublic 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")public String submitForm(@ModelAttribute("reservation") Reservation res){ return "confirmation-form"; }}

4.在web.xml文件中提供控制器的条目
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>

5.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/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsdhttp://www.springframework.org/schema/mvchttp://www.springframework.org/schema/mvc/spring-mvc.xsd"> < !-- Provide support for component scanning --> < context:component-scan base-package="com.srcmini" /> < !--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="http://www.srcmini.com/WEB-INF/jsp/"> < /property> < property name="suffix" value="http://www.srcmini.com/.jsp"> < /property> < /bean> < /beans>

6.创建请求的页面
index.jsp

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

7.创建视图组件
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> Gender: Male< form:radiobutton path="Gender" value="http://www.srcmini.com/Male"/> Female< form:radiobutton path="Gender" value="http://www.srcmini.com/Female"/> < br> < br> Meals:BreakFast< form:checkbox path="Food" value="http://www.srcmini.com/BreakFast"/> Lunch< form:checkbox path="Food" value="http://www.srcmini.com/Lunch"/> Dinner< form:checkbox path="Food" value="http://www.srcmini.com/Dinner"/> < br> < br> < input type="submit" value="http://www.srcmini.com/Submit" /> < /form:form> < /body> < /html>

确认页面.jsp

< %@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> < !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} < br> Gender: ${reservation.gender}< br> Meals: < ul> < c:forEach var="meal" items="${reservation.food}"> < li> ${meal}< /li> < /c:forEach> < /ul> < /body> < /html>

输出