SpringMVC入门

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环境：jar包

1. SpringMVC主要组件：DispatcherServlet 、Controller 、ViewResolver 等

2. XML文件： web.xml 、[servlet-name]-servlet.xml

3. 执行流程：

4. SpringMVC之表单：

①web.xml 定义DispatcherServlet

<?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"  id="WebApp_ID" version="2.5">  <servlet>    <servlet-name>FormHandling</servlet-name> <!-- 这里的名称一定要和[servlet-name]-servlet.xml一致 -->    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>    <load-on-startup>1</load-on-startup>  </servlet>    <servlet-mapping>    <servlet-name>FormHandling</servlet-name>    <url-pattern>/</url-pattern>  </servlet-mapping></web-app>

② FormHandling-servlet.xml 定义<bean> 定义页面跳转的前缀后缀等-----------和-------------使用扫描来激活Controller，使注释生效

<?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:context="http://www.springframework.org/schema/context"    xmlns:mvc="http://www.springframework.org/schema/mvc"    xsi:schemaLocation="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-4.1.xsd        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd">               <context:component-scan base-package="com.imut.po"/>     <context:component-scan base-package="com.imut.controller"/>          <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">     <property name="prefix" value="/WEB-INF/jsp/"/>     <property name="suffix" value=".jsp"/>     </bean></beans>

③ 定义POJO 和Controller

public class Student {private int age;private String name;private int id;public int getAge() {return age;}public void setAge(int age) {this.age = age;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getId() {return id;}public void setId(int id) {this.id = id;}public Student(int age, String name, int id) {super();this.age = age;this.name = name;this.id = id;}public Student() {super();}}

@Controllerpublic class StudentController {@RequestMapping(value="/student",method = RequestMethod.GET)public ModelAndView student(){return new ModelAndView("student", "command", new Student());}@RequestMapping(value="/addStudent", method = RequestMethod.POST)public String addStudent(@ModelAttribute("studentForm")Student student , ModelMap model){model.addAttribute("name", student.getName());model.addAttribute("age",student.getAge());model.addAttribute("id", student.getId());return "result";}}

注意：在ModelAndView对象中传递了一个名为“command”的空对象，因为如果在JSP中使用<form：form>标签，spring框架需要一个名为“command”的对象文件。所以当调用student()方法时，它返回student.jsp视图。

④student.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>Spring 处理表单</title></head><body><h2>Student Information</h2><form:form action="/FormHanding/addStudent" method="POST" ><table><tr><td><form:label path="name">名字：</form:label></td><td><form:input path="name"/></td></tr><tr><td><form:label path="age">年龄：</form:label></td><td><form:input path="age"/></td></tr><tr><td><form:label path="id">编号</form:label></td><td><form:input path="id"/></td></tr><tr><td colspan="2"><input type="submit" value="提交表单"/></td></tr></table></form:form></body></html>

result.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>Spring MVC表单处理</title></head><body><h2>提交的学生信息如下</h2><table><tr><td>姓名</td><td>${name }</td></tr><tr><td>年龄</td><td>${age }</td></tr><tr><td>编号</td><td>${id }</td></tr></table></body></html>

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