Spring表单标签和modelAttribute

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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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5"> <context-param>     <param-name>contextConfigLocation</param-name>     <param-value>classpath*:/springMVC.xml</param-value> </context-param> <listener>     <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>   </listener>   <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*:/springMVC.xml</param-value>     </init-param>     <load-on-startup>1</load-on-startup>   </servlet>   <servlet-mapping>     <servlet-name>springMVC</servlet-name>     <url-pattern>/</url-pattern>   </servlet-mapping>   <welcome-file-list>     <welcome-file>index.jsp</welcome-file>   </welcome-file-list> </web-app>

springMVC.xml

<?xml version="1.0" encoding="UTF-8"?> <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" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd         http://www.springframework.org/schema/context         http://www.springframework.org/schema/context/spring-context-3.1.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd"> <mvc:resources mapping="/resources/**" location="/"/> <mvc:annotation-driven/> <context:component-scan base-package="com.test.controller" /> <bean  class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix"><value>/WEB-INF/pages/</value></property> <property name="suffix"><value>.jsp</value></property> </bean> </beans>

/创建一个实体Book类

public class Book { String name; String press; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getPress() { return press; } public void setPress(String press) { this.press = press; } }

@Controller @RequestMapping("/welcome") public class Hello {    //处理index.jsp表单提交    @RequestMapping(value="/show.do",method=RequestMethod.POST)    public String show(@ModelAttribute("book")Book book,Map<String,Object>model){ model.put("book",book); return "hello"; } //我们不能直接访问使用Spring表单标签的JSP页面，要先通过controller处理modelAttribute和表单标签的绑定才能访问           @RequestMapping(value="/new.do",method=RequestMethod.GET) public String login(Map model){ Book book=new Book();        model.put("book",book); return "index"; } }

通过controller处理后，book里的属性自动和表单标签里的"path"绑定，简单来说，其实path就是起到了book.getXXX()的作用。
切记，path后跟着的名字要与对象的属性名字一样，否则绑定不了

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"     pageEncoding="UTF-8"%> <%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%> <%@ page import="com.test.entity.*" %> <!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>Insert title here</title> </head> <body> <form:form modelAttribute="book" method="POST" action="show.do"> <table> <tr> <td><form:input path="name"/></td> </tr> <tr> <td><form:input path="press"/></td> </tr> <tr> <td><input type="submit" value="O K"> </td> </tr> </table> </form:form> </body> </html>

hello.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"     pageEncoding="utf-8"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <!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=ISO-8859-1"> <title>Insert title here</title> </head> <body> bookName=${book.getName()},press=${book.getPress()} </body> </html>