Spring表单标签和modelAttribute

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Spring

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>