springmvc的form标签的modelAttribute

作者：我家自动化 | 2024-04-22 19:59:51

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一、前言：

spring的一些页面标签都需要先用一个controller类的方法跳转到此网页：

modelAttribute="user"要求需要先用一个controller类的方法跳转到此网页，并且此方法的Model中必须绑定一个user对象，而且必须和单词user一模一样，否则就会报错

注意：如果不设置modelAttribute="user"，则默认会认为modelAttribute的值是command，完整如右：modelAttribute="command"。同时也需要用一个controller类的方法跳转到此网页，并且此方法的Model中必须绑定一个command对象，而且必须和单词command一模一样，否则就会报错

<form:form method="post"  modelAttribute="user"  action="login"></form>

二、具体实现：

2.1.web.xml:


<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >
 
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns="http://xmlns.jcp.org/xml/ns/javaee"
        xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
        version="3.1">
 
        <!-- 注册springmvc框架核心控制器 -->
  <servlet>
    <servlet-name>DispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  <init-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:app-ssm0415.xml</param-value>
  </init-param>
  </servlet>
  <servlet-mapping>
    <servlet-name>DispatcherServlet</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
 
  <absolute-ordering />
 
 
  <filter>
    <filter-name>encodingFilter</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>
  <init-param>
    <param-name>forceEncoding</param-name>
    <param-value>true</param-value>
  </init-param>
  </filter>
  <filter-mapping>
    <filter-name>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
 
 
</web-app>

2.2.app-ssm0415.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:p="http://www.springframework.org/schema/p"
	   xmlns:aop="http://www.springframework.org/schema/aop"
	   xmlns:mvc="http://www.springframework.org/schema/mvc"
	   xmlns:util="http://www.springframework.org/schema/util"
	   xmlns:context="http://www.springframework.org/schema/context"
	xmlns:jee="http://www.springframework.org/schema/jee"
	xsi:schemaLocation="    
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd  
        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/jee http://www.springframework.org/schema/jee/spring-jee.xsd
		http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
		http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd">
 
 
	<!--扫描day0411中标注有spring注解的类并创建这些类的对象-->
	<context:component-scan base-package="day0415"/>
 
    <mvc:annotation-driven/>
 
	<!--   浏览器的地址中写"/static/"，最终会访问项目中的/static/文件夹	-->
	<!--   浏览器的地址中写"/static/"，最终会访问项目中的/static/文件夹  -->
	<mvc:resources mapping="/static/" location="/static/"/>
	<mvc:default-servlet-handler/>
 
 
 
 
 
	<!-- 2.配置数据源(采用dbcp连接池) -->
	<bean id="ds"
		  class="org.apache.commons.dbcp.BasicDataSource">
		<property name="url" value="jdbc:mysql://localhost:3306/test_db?characterEncoding=utf-8&amp;serverTimezone=GMT%2B8" />
		<property name="driverClassName" value="com.mysql.cj.jdbc.Driver" />
		<property name="username" value="root" />
		<property name="password" value="root" />
		<property name="initialSize" value="2" />
		<property name="maxActive" value="10" />
	</bean>
 
	<!-- 3.配置SqlSessionFactoryBean -->
	<bean class="org.mybatis.spring.SqlSessionFactoryBean">
		<!-- 指定数据源 -->
		<property name="dataSource" ref="ds" />
		<!-- 指定XML文件的位置 -->
		<property name="mapperLocations" value="classpath:mappers/*.xml" />		
	</bean>
 
	<!-- 4.配置MapperScannerConfigurer -->
	<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
		<!-- 接口文件在哪里 -->
		<property name="basePackage" value="day0415" />
	</bean>
 
 
 
	<!--  3.视图解析器  -->
	<bean id="jspViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
			<property name="prefix"  value="/views/" />
			<property name="suffix"  value=".jsp" />
	</bean>
 
</beans>

2.3.day0415.model.User


package day0415.model;
 
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
 
@Data//提供类的get、set、equals、hashCode、canEqual、toString方法
@AllArgsConstructor
@NoArgsConstructor
public class User {
    private String username;
    private String password;
    private int uid;
 
 
    public User(String username, String password) {
        this.username = username;
        this.password = password;
    }
 
}

2.4.day0415.controller.UserController415


package day0415.controller;
 
import day0415.model.User;
import day0415.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
 
 
@Controller
public class UserController415 {
 
 
    @RequestMapping("/user/toLogin")
    String  toLogin( Model model){
        model.addAttribute("user",new User());
        return "login2";
    }
 
 
    @RequestMapping("/user/login")
    ModelAndView  login( User u, Model model){
        ModelAndView mv=new ModelAndView();
        mv.setViewName("success");
        model.addAttribute("user", u);
        return mv;
    }
 
}

2.5.login2.jsp:


<%@ page  isELIgnored="false"  contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<%
    String basePath = request.getScheme()+"://" +
            request.getServerName() + ":" + request.getServerPort() +
            request.getContextPath();
%>
<!DOCTYPE html>
<html lang="en">
 
<head>
    <meta charset="UTF-8">
    <title>登录界面</title>
    <style>
        html,body{
            height: 100%;
        }
        body{
            background: #006666;
        }
        h1{
            color: #FFF;
            text-align: center;
        }
        .container{
            margin: 100px auto;
            width: 30%;
        }
        form{
            background: #FFF;
            height: 300px;
            width: 100%;
            border-radius: 10px;
            position: relative;
        }
        label{
            color: #000;
            font-weight: bold;
            font-size: 20px;
            margin-left: 40px;
        }
        input{
            text-align: left;
            margin: 10px;
        }
        .input{
            width: 80%;
            height: 35px;
            margin-left: 40px;
        }
        .checkbox{
            margin-left: 30px;
        }
        a{
            text-decoration: none;
            font-weight: bold;
        }
        .submit{
            display: inline-block;
            margin-top: 0;
            margin-left:145px;
            background: #000;
            border: none;
            color: #FFF;
            height: 35px;
            width: 100px;
            text-align: center;
            font-weight: bold;
            border-radius: 5px;
        }
        .left{
            margin: 20px;
        }
        .right{
            position: absolute;
            right: 20px;
        }
    </style>
</head>
 
<body>
    <div class="container">
        <h1>用户登录2</h1>
        <h6>${msg}</h6>
        
 
        <%--@elvariable id="user" type="day0415.model.User"--%>
        <form:form method="post"  modelAttribute="user"  action="login">
            <br>
            <label for="username">用户名</label><br>
            <form:input type="text" path="username" id="username" class="input" value="" placeholder="用户名admin"/><br>
            <label for="pwd">密码</label><br>
            <form:input type="password" path="password" id="pwd" class="input" value="" placeholder="密码admin"/>
            <div class="checkbox">
                <input type="checkbox" name="">
                <span>记住密码</span>
            </div>
            <button type="submit" class="submit">登录</button>
        </form:form>
    </div>
   
</body>
 
</html>

2.6.success.jsp


<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="UTF-8">
		<title>CodePen - Happy New Year!</title>
		<meta name="viewport" content="width=device-width, initial-scale=1">
		<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/5.0.0/normalize.min.css">
		<style>
			@import url("https://fonts.googleapis.com/css?family=Caveat");
html, body {
  background: linear-gradient(to bottom, #090513 0%, #964987 75%, #fdbca3 100%);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
 
.stars {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  -webkit-animation: rotation 360s infinite linear;
          animation: rotation 360s infinite linear;
}
.stars:after, .stars:before {
  content: "";
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  background: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAGQAQMAAAC6caSPAAAABlBMVEVHcEz///+flKJDAAAAAXRSTlMAQObYZgAAAIVJREFUeAHt2SEOwkAQhtFJKuqKRRGOgKzgUMgKRI/G0ZDoacNkN/ue/zJ+/ugBcI+01/EEAGBc04FkP58AVFoi7VaSLAEAAPB/j0hbK678AADMkXbZG03mGA0AAKsP3JgAAGDa88knsuZ8Mp1M6gEAPFtNrtEjtkh7lyRb3/PAWpS0BPgC0PMMdOEjXqoAAAAASUVORK5CYII=");
}
.stars:after {
  background-size: 100px;
  opacity: 0.4;
}
.stars:before {
  background-size: 200px;
  opacity: 0.6;
}
 
@-webkit-keyframes rotation {
  0% {
    transform: rotate(0);
  }
  100% {
    transform: rotate(360deg);
  }
}
 
@keyframes rotation {
  0% {
    transform: rotate(0);
  }
  100% {
    transform: rotate(360deg);
  }
}
h1 {
  font-size: calc(1.5em + 5vw);
  color: #fff;
  font-family: "Caveat", sans-serif;
  text-align: center;
  padding: 0.5em;
  transform: rotate(-4deg) translateY(-15vh);
}
 
.mountains {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  width: auto;
  min-width: 100%;
  height: 60px;
  fill: #000022;
}
 
.mountains--layer1 {
  z-index: 2;
}
 
.mountains--layer2 {
  fill: #9D5189;
  z-index: 0;
}
		</style>
		<script>
			const B_CHILD = {
  fill: { '#ffffff': '#ef1cec' },
  delay: 'rand(300, 359)',
  duration: 700,
  pathScale: 'rand(0.8, 1)',
  isSwirl: true,
  swirlSize: 'stagger(-2,2)',
  swirlFrequency: 1 };
 
const B_OPTS = {
  count: 'rand(15,20)',
  top: '100%',
  children: {
    ...B_CHILD } };
 
 
const burst1 = new mojs.Burst({
  ...B_OPTS,
  radius: { 0: 'rand(150,170)' },
  x: -45,
  y: -335 });
 
 
const burst1_2 = new mojs.Burst({
  ...B_OPTS,
  radius: { 0: 'rand(150,170)' },
  x: -45,
  y: -335,
  children: {
    ...B_CHILD,
    delay: 'rand(260, 350)',
    pathScale: 'rand(0.7, 0.8)',
    degreeShift: 20 } });
 
 
 
 
const burst2 = new mojs.Burst({
  ...B_OPTS,
  radius: { 0: 'rand(100,150)' },
  x: 140,
  y: -315,
  children: {
    ...B_CHILD,
    fill: { '#ffffff': '#d8ff00' } } });
 
 
 
const burst2_2 = new mojs.Burst({
  ...B_OPTS,
  radius: { 0: 'rand(100,150)' },
  x: 140,
  y: -315,
  children: {
    ...B_CHILD,
    fill: { '#ffffff': '#d8ff00' },
    delay: 'rand(260, 350)',
    pathScale: 'rand(0.7, 0.8)',
    degreeShift: 20 } });
 
 
 
// Create interactive burst
const burst_tune = new mojs.Burst({
  ...B_OPTS,
  radius: { 0: 'rand(100,150)' },
  left: 0,
  top: 0,
  x: 0,
  y: 0,
  children: {
    ...B_CHILD,
    delay: 'rand(0, 50)',
    fill: { '#ffffff': '#d8ff00' } } });
 
 
const burst_tune_2 = new mojs.Burst({
  ...B_OPTS,
  radius: { 0: 'rand(100,150)' },
  left: 0,
  top: 0,
  children: {
    ...B_CHILD,
    fill: { '#ffffff': '#d8ff00' },
    delay: 'rand(10, 150)',
    pathScale: 'rand(0.7, 0.8)',
    degreeShift: 20 } });
 
 
document.addEventListener('click', function (e) {
  burst_tune.
  generate().
  tune({ x: e.pageX, y: e.pageY }).
  replay();
  burst_tune_2.
  generate().
  tune({ x: e.pageX, y: e.pageY }).
  replay();
});
 
// Create the firework lines
const FW_OPTS = {
  shape: 'curve',
  fill: 'none',
  isShowStart: false,
  strokeWidth: { 3: 0 },
  stroke: '#ffffff',
  strokeDasharray: '100%',
  strokeDashoffset: { '-100%': '100%' },
  duration: 1000 };
 
const fw1 = new mojs.Shape({
  ...FW_OPTS,
  radius: 170,
  radiusY: 20,
  top: '100%',
  y: -165,
  angle: 75,
  onStart: function () {
    burst1.replay(0);
    burst1_2.replay(0);
  } });
 
 
 
const fw2 = new mojs.Shape({
  ...FW_OPTS,
  radius: 180,
  radiusY: 50,
  top: '100%',
  x: 50,
  y: -155,
  strokeDashoffset: { '100%': '-100%' },
  angle: -60,
  delay: 200,
  onStart: function () {
    burst2.replay(0);
    burst2_2.replay(0);
  } });
 
 
// Underline under title
const underline = new mojs.Shape({
  parent: document.getElementById('title'),
  shape: 'curve',
  strokeLinecap: 'round',
  fill: 'none',
  isShowStart: false,
  strokeWidth: { '1em': '5em' },
  stroke: '#ffffff',
  strokeDasharray: '200%',
  strokeDashoffset: { '200%': '100%' },
  radius: 150,
  radiusY: 10,
  y: '1.1em',
  angle: -10,
  duration: 2000,
  delay: 1000 }).
then({
  strokeWidth: { '5em': '1em' },
  strokeDashoffset: { '100%': '-200%' },
  duration: 2000,
  delay: 10000 });
 
const timelineText = new mojs.Timeline({
  repeat: 2018 }).
 
add(underline).
play();
 
// Fire off the explosions
const timeline = new mojs.Timeline({
  repeat: 2018 }).
 
add([fw1, fw2]).
play();
 
// Create sounds
// var explosion = new Audio("https://www.freesound.org/data/previews/21/21410_21830-lq.mp3"); // buffers automatically when created
// explosion.play();
			
		</script>
 
	</head>
	<body>
		<!-- partial:index.partial.html -->
		<h1 id="title">欢迎  ${user.username} 访问京淘网页</h1>
		${allUsers}
 
		<div class="stars"></div>
		<svg class="mountains mountains--layer1" xmlns="http://www.w3.org/2000/svg" width="1920" height="200"
			viewBox="0 0 1920 200" preserveAspectRatio="none">
			<title>bergskedja</title>
			<path
				d="M0,41.57s21.25,2.19,27.33,2.19,22.27-4.37,28.34,0-1,22.94,6.07,19.67S72.87,52,81,52.81s16.19,10.15,22.27,0,25.3-1.41,30.36,6.24,21.25,7.33,26.32,4.76,8.1-20.66,16.19-22,17.21-6.31,18.22,0,5.06,3,12.15,3,20.24-10.93,25.3-14.2S238.86,11,259.1,11s35.42,4.37,43.52,0S316.79.05,321.86.05,337-1,337,6.61s6.07,24.92,15.18,26.12,30.36,11,34.41,14.31,18.22-2.19,18.22-2.19c11.13,7.65,20.24,0,20.24,0S441.29,23,453.43,18.63s17.21,4.37,20.24,7.65S497,32.62,500,32.73s19.23-10.82,23.28-10.82,27.33-4.37,34.41-3.28,16.19,10.72,16.19,14.1S582,52.5,586,52.5s15.18,2.19,21.25,2.19,14.17,1.09,17.21,1.09,6.07-3.28,26.32-13.11S669,21.91,677.11,24.09s9.11,14.2,16.19,13.11,0-17.48,24.29-17.48a140.45,140.45,0,0,1,44.53,7.65s3,29.5,17.21,29.5c0,0,28.34-7.65,36.44-7.65s39.47,7.33,47.57,16.23,32.39,12.18,42.51,12.18,25.3,15.3,28.34,15.3,23.28,3.28,28.34-5.46S967.59,66.7,975.69,58s10.12-21.3,17.21-11.2,13.16,8.47,16.19,0,14.17-16.12,17.21-16.12,19.23,3.28,19.23,6.56,25.3-2.19,35.42-12,39.47-9.83,65.79-9.83,54.65,9.83,61.74,14.2,33.4,7.65,42.51,7.65,20.24,4.37,26.32,4.37,5.06,9.83,17.21,13.11,25.3-8.19,28.34-7.92,10.12-16.12,19.23-16.12,27.33,16.94,34.41,16.12,22.27,22.12,28.34,24.31,2,12.13,18.22,22.45,22.27,32.18,34.41,32.18,50.61-8.74,54.65-15.3,22.27-19.67,27.33-19.67,34.41-7.65,38.46-4.37,29.35,22.94,48.58,22.94,46.56-14.2,54.65-14.2,23.28-9.83,35.42-9.83,46.56,12,57.69,14.2,42.51,8.74,58.7,8.74,38.67-42.77,66.8-45.89c6.12-.68,20.24,1.09,20.24,1.09V200H0Z" />
		</svg>
 
		<svg class="mountains mountains--layer2" xmlns="http://www.w3.org/2000/svg" width="1920" height="200"
			viewBox="0 0 1920 200" preserveAspectRatio="none">
			<title>bergskedja2</title>
			<path
				d="M0,82.09s21.14-13,30.14-19,24-16,45-17.5,49.5-23.86,63-17c0,0,62.87.71,70.5,6.67s81,40.83,127.49,40.83,88.5-20.16,126-24.33,68.23-29.63,90-24.33,31.5,3.89,46.5-.72,25.5-19.61,42-19.61,25.5-7.1,51-7.1,39,11.59,63,11.59,60-3,75,3S864.1,4,882.09,4,934.41,22.09,960,17.59s58.59-7.5,75.09-4.5,36,16.9,61.5,25,82.5,17,97.5,18.55,51.77-6,67.5-10.5S1313,30,1330.81,38s23.76,44,44.76,44,45-6,57-12,31.5-22.5,45-22.5,12,7.5,31.5,7.5,42-4.5,57-4.5,24-25.5,49.5-22.5,66,1.9,90,13,49.5,30.55,78,33.55,54-16.5,69-12,44.91,19.5,67.45,19.5V200H0Z" />
		</svg>
		<!-- partial -->
		<script src='https://cdn.jsdelivr.net/mojs/latest/mo.min.js'></script>
		<script src="./script.js"></script>
 
	</body>
</html>

注：modelAttribute="user"要求需要先用一个UserController类的toLogin方法跳转到login.jsp网页，并且toLogin方法的Model中必须绑定一个user对象，而且必须和单词user一模一样，否则就会报错

modelAttribute="user"用于将表单中的表单项的数据绑定到Model中的user对象中。

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