1.概述:
Spring的標籤庫集成在Spring Web MVC中,因此這裏的標籤可以訪問控制器處理命令對象和綁定數據。表單標籤庫的實現類在spring-webmvc.jar文件中,標籤庫描述文件是spring-form.tld。要使用Spring MVC的表單標籤庫,必須在JSP頁面的開頭處聲明一下taglib指令:<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
2.使用input標籤綁定表單數據,通過path屬性來指定要綁定的Model中的值(代碼示例如下:)
pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.lin</groupId>
<artifactId>SpringTagTest</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<dependencies>
<!-- spring begin -->
<!--spring-core-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>4.2.0.RELEASE</version>
</dependency>
<!-- spring-web-mvc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>4.2.0.RELEASE</version>
</dependency>
<!-- spring end -->
</dependencies>
<!-- 添加項目jdk編譯插件 -->
<build>
<!-- 設置編譯版本爲1.8 -->
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
<!-- 配置tomcat7的插件,如果使用maven的命令方式運行,則命令爲:tomcat7:run ,
而不能是tomcat:run(如果使用該命令,還是會使用maven默認的tomcat來編譯運行項目)。
可以直接使用eclipse中的tomcat來運行項目(就是原先沒有使用maven時的那樣運行項目就可以了,那樣的話也不需要配這個插件了)。
-->
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.1</version>
</plugin>
</plugins>
</build>
</project>
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_2_5.xsd" version="2.5">
<display-name>SpringTagTest</display-name>
<!-- 定義Spring MVC的前端控制器 -->
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>
org.springframework.web.servlet.DispatcherServlet
</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring/springmvc-config.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<!-- 讓Spring MVC的前端控制器攔截所有請求 -->
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!-- 編碼過濾器 -->
<filter>
<filter-name>characterEncodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>characterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
springmvc-config.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mybatis="http://mybatis.org/schema/mybatis-spring"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.2.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-4.2.xsd
http://mybatis.org/schema/mybatis-spring
http://mybatis.org/schema/mybatis-spring.xsd">
<!-- 自動掃描該包,SpringMVC會將包下用@Controller註解的類註冊爲Spring的controller -->
<context:component-scan base-package="com.lin"/>
<!-- 設置默認配置方案 -->
<mvc:annotation-driven/>
<!-- 使用默認的Servlet來響應靜態文件 -->
<mvc:default-servlet-handler/>
<!-- 視圖解析器 -->
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!-- 前綴 -->
<property name="prefix">
<value>/WEB-INF/content/</value>
</property>
<!-- 後綴 -->
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
</beans>
User.java
package com.lin.domain;
import java.io.Serializable;
public class User implements Serializable{
private static final long serialVersionUID = 1L;
private String userName;
private String sex;
private int age;
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public User() {
super();
}
public User(String userName, String sex, int age) {
super();
this.userName = userName;
this.sex = sex;
this.age = age;
}
}
UserController.java
package com.lin.controller;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import com.lin.domain.User;
@Controller
public class UserController {
@RequestMapping(value="registerForm")
public String registerForm(Model model){
User u = new User("lin","男",25);
model.addAttribute("user", u);
return "registerForm";
}
@RequestMapping(value="testFormValue")
public void testFormValue(User user){
System.out.println(user.getUserName());
System.out.println(user.getSex());
System.out.println(user.getAge());
}
}
registerForm.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>註冊頁</title>
</head>
<body>
<form:form modelAttribute="user" action="testFormValue" method="POST">
用戶名:<form:input path="userName"/><br>
性別:<form:input path="sex"/><br>
年齡:<form:input path="age"/>
<form:button value="提交"></form:button>
</form:form>
</body>
</html>
這裏提一下,在生成頁面時,<form:input path="userName"/>,會被瀏覽器渲染成<input id="userName" name="userName" type="text" value="lin"/>,其他相似。
訪問控制器:因爲在訪問http://localhost:8080//SpringTagTest/registerForm的時候控制器放了一個值在model域中,所以可以直接在頁面中通過path屬性將其值綁定到表單。這裏要注意的就是名字的問題,頁面中的modelAttribute="user"表示要綁定的對象名;如果沒有設置的話默認爲modelAttribute="command",意思就是說在model存值的時候必須將對象存到這個鍵中,否則數據肯定是綁定失敗的啦!!運行結果如下
直接點擊右側的按鈕(不知道爲什麼按鈕長這樣,不過不要介意,能用就行,哈哈哈)
可以看到,值又傳遞到後臺controller方法中,並在控制檯打印。。
===========================
其他表單標籤庫都差不多就是上面那種用法,還是挺方便的,花一點點時間瞭解下~