Spring(十七)之表单处理

发布时间：2020-12-15 07:12:30 所属栏目：Java 来源：网络整理

导读：表单处理在实际开发中，非常常见，比如登录、注册或者新增、修改等等。希望本示例对于初学者有一定的提升和帮助该表单实例，主要说明MVC，相当于前台表单提交，提交相当于一个Http请求，这个请求通过Controller映射到对应的@RequestMapping,找到对应的@Req

表单处理在实际开发中，非常常见，比如登录、注册或者新增、修改等等。

希望本示例对于初学者有一定的提升和帮助

该表单实例，主要说明MVC，相当于前台表单提交，提交相当于一个Http请求，这个请求通过Controller映射到对应的@RequestMapping,找到对应的@RequestMapping的value,即路由，经过该路由处理，将数据以Model或ModelAndView或ModelMap的形式返回给前台展示。

示例讲解:

一、导入依赖

<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>cn.spring</groupId>
  <artifactId>spring-example</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
   <dependencies>
  	<!-- spring核心包 -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-test</artifactId>
			<version>4.3.13.RELEASE</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-webmvc</artifactId>
			<version>4.3.13.RELEASE</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-core</artifactId>
			<version>4.3.13.RELEASE</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-aop</artifactId>
			<version>4.3.13.RELEASE</version>
		</dependency>
		<dependency>
			<groupId>aspectj</groupId>
			<artifactId>aspectjweaver</artifactId>
			<version>1.5.4</version>
		</dependency>
		<dependency>
			<groupId>aspectj</groupId>
			<artifactId>aspectjrt</artifactId>
			<version>1.5.4</version>
		</dependency>
		<dependency>
			<groupId>org.codehaus.jackson</groupId>
			<artifactId>jackson-mapper-asl</artifactId>
			<version>1.9.11</version>
		</dependency>
		<!--mybatis核心包 -->
		<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis</artifactId>
			<version>3.1.1</version>
		</dependency>
		<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis-spring</artifactId>
			<version>1.1.1</version>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>5.1.21</version>
		</dependency>
		<dependency>
			<groupId>c3p0</groupId>
			<artifactId>c3p0</artifactId>
			<version>0.9.1.2</version>
			<type>jar</type>
		</dependency>
		<!--打印日志 -->
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-api</artifactId>
			<version>1.7.5</version>
		</dependency>
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-log4j12</artifactId>
			<version>1.7.5</version>
		</dependency>
		<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
			<version>1.2.17</version>
		</dependency>
		<dependency>
			<groupId>jstl</groupId>
			<artifactId>jstl</artifactId>
			<version>1.2</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context-support</artifactId>
			<version>4.3.13.RELEASE</version>

		</dependency>

		<!-- https://mvnrepository.com/artifact/javax.servlet.jsp/jsp-api -->
		<dependency>
			<groupId>javax.servlet.jsp</groupId>
			<artifactId>jsp-api</artifactId>
			<version>2.1</version>
		</dependency>

		<!-- javax.servlet-api -->
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>javax.servlet-api</artifactId>
			<version>3.1.0</version>
		</dependency>

		<!-- spring-web -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-web</artifactId>
			<version>4.3.13.RELEASE</version>
		</dependency>

		<!-- spring-webmvc -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-webmvc</artifactId>
			<version>4.3.13.RELEASE</version>
		</dependency>
		<!-- 阿里巴巴fastjson -->
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>fastjson</artifactId>
			<version>1.2.41</version>
		</dependency>
		<!--dbcp -->
		<dependency>
			<groupId>org.apache.commons</groupId>
			<artifactId>commons-dbcp2</artifactId>
			<version>2.1.1</version>
		</dependency>
  	
  </dependencies>
</project>

二、编写对应的实体

package com.tutorialspoint;
public class Student {
   private Integer age;
    String name;
    Integer id;
   void setAge(Integer age) {
      this.age = age;
   }
   public Integer getAge() {
      return setName(String name) {
      this.name = name;
   }
    String getName() {
       setId(Integer id) {
      this.id = id;
   }
    Integer getId() {
       id;
   }
}

三、编写对应的Controller

import org.springframework.stereotype.Controller;
 org.springframework.web.bind.annotation.ModelAttribute;
 org.springframework.web.bind.annotation.RequestMapping;
 org.springframework.web.bind.annotation.RequestMethod;
 org.springframework.web.servlet.ModelAndView;
 org.springframework.ui.ModelMap;
@Controller
 StudentController {
   @RequestMapping(value = "/student",method = RequestMethod.GET)
    ModelAndView student() {
      return new ModelAndView("student","command",new Student());
   }   
   @RequestMapping(value = "/addStudent",1)"> RequestMethod.POST)
   public String addStudent(@ModelAttribute("SpringWeb")Student student,ModelMap model) {
      model.addAttribute("name",student.getName());
      model.addAttribute("age"return "result";
   }
}

ModelMap同ModelAndView相同点，将数据已键值对形式返回到前台，而前台只需知道对应的键即可，就可以获得对应的值。

当然就视图与数据分离而言，尽量不要使用ModelAndView，尽量使用Model或者ModelMap也可以。

四、编写jsp文件

student.jsp

<%@taglib uri="http://www.springframework.org/tags/form prefixform"%>
<html>
head>
    title>Spring MVC Form Handling</body>

h2>Student Informationform:form method="POST" action="/spring-example/addStudent">
   tabletr>
        td><form:label path="name">Nameform:label></form:input ="name" /></="age">Age="age" ="id">id="id" td colspan="2">
            input type="submit" value="Submit"/>
        >  
form:form>

result.jsp

<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<html>
<head>
    <title>Spring MVC Form Handling</title>
</head>
<body>

<h2>Submitted Student Information</h2>
   <table>
    <tr>
        <td>Name</td>
        <td>${name}</td>
    </tr>
    <tr>
        <td>Age</td>
        <td>${age}</td>
    </tr>
    <tr>
        <td>ID</td>
        <td>${id}</td>
    </tr>
</table>  
</body>
</html>

五、HelloWeb-servlet.xml

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"
   xsi:schemaLocation="
   http://www.springframework.org/schema/beans     
   http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
   http://www.springframework.org/schema/context 
   http://www.springframework.org/schema/context/spring-context-3.0.xsd">

   context:component-scan base-package="com.tutorialspoint" />

   bean ="org.springframework.web.servlet.view.InternalResourceViewResolver">
      property name="prefix"="/WEB-INF/jsp/" />
      ="suffix"=".jsp" />
   beanbeans>

六、修改web.xml

<?xml version="1.0" encoding="UTF-8"?>
web-app xmlns:xsi 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>spring-exampleservletservlet-name>HelloWebservlet-class>
         org.springframework.web.servlet.DispatcherServlet
      load-on-startup>1servlet-mappingurl-pattern>/web-app>

七、启动应用

结果如图:

（编辑：李大同）

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