SpringMVC入门程序

1、程序概述

用户进入index.jsp页面中点击超链接，然后后台打印输出一句话，然后跳转到success.jsp页面

2、项目目录

3、代码与分析

pox.xml 依赖的jar

<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>4.0.0modelVersion>

  <groupId>com.springMVCgroupId>
  <artifactId>SpringMVC1artifactId>
  <version>1.0-SNAPSHOTversion>
  <packaging>warpackaging>

  <name>SpringMVC1 Maven Webappname>
  
  <url>http://www.example.comurl>

  <properties>
    <project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
    <maven.compiler.source>1.8maven.compiler.source>
    <maven.compiler.target>1.8maven.compiler.target>

    <spring.version>5.0.2.RELEASEspring.version>
  properties>

  <dependencies>
    <dependency>
      <groupId>org.springframeworkgroupId>
      <artifactId>spring-contextartifactId>
      <version>${spring.version}version>
    dependency>

    <dependency>
      <groupId>org.springframeworkgroupId>
      <artifactId>spring-webartifactId>
      <version>${spring.version}version>
    dependency>

    <dependency>
      <groupId>org.springframeworkgroupId>
      <artifactId>spring-webmvcartifactId>
      <version>${spring.version}version>
    dependency>

    <dependency>
      <groupId>javax.servletgroupId>
      <artifactId>servlet-apiartifactId>
      <version>2.5version>
      <scope>providedscope>
    dependency>

    <dependency>
      <groupId>javax.servlet.jspgroupId>
      <artifactId>jsp-apiartifactId>
      <version>2.0version>
      <scope>providedscope>
    dependency>

    <dependency>
      <groupId>junitgroupId>
      <artifactId>junitartifactId>
      <version>4.11version>
      <scope>testscope>
    dependency>
  dependencies>

  <build>
    <finalName>SpringMVC1finalName>
    <pluginManagement>
      <plugins>
        <plugin>
          <artifactId>maven-clean-pluginartifactId>
          <version>3.1.0version>
        plugin>
        
        <plugin>
          <artifactId>maven-resources-pluginartifactId>
          <version>3.0.2version>
        plugin>
        <plugin>
          <artifactId>maven-compiler-pluginartifactId>
          <version>3.8.0version>
        plugin>
        <plugin>
          <artifactId>maven-surefire-pluginartifactId>
          <version>2.22.1version>
        plugin>
        <plugin>
          <artifactId>maven-war-pluginartifactId>
          <version>3.2.2version>
        plugin>
        <plugin>
          <artifactId>maven-install-pluginartifactId>
          <version>2.5.2version>
        plugin>
        <plugin>
          <artifactId>maven-deploy-pluginartifactId>
          <version>2.8.2version>
        plugin>
      plugins>
    pluginManagement>
  build>
project>

web.xml这里配置信息，其中init-param标签是加载Spring的配置文件，这个需要我们自己创建的。
load-on-startup标签表示：标记容器是否在启动的时候就加载这个servlet。
当值为0或者大于0时，表示容器在应用启动时就加载这个servlet；
当是一个负数时或者没有指定时，则指示容器在该servlet被选择时才加载。

<web-app>
  <display-name>Archetype Created Web Applicationdisplay-name>

  <servlet>
    <servlet-name>dispatcherServletservlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>

    <init-param>
      <param-name>contextConfigLocationparam-name>
      <param-value>classpath:springMVC.xmlparam-value>
    init-param>
    <load-on-startup>1load-on-startup>
  servlet>
  <servlet-mapping>
    <servlet-name>dispatcherServletservlet-name>
    <url-pattern>/url-pattern>
  servlet-mapping>
web-app>

springMVC.xml
这里有扫描包，和视图解析器对象，里面的标签是配置加载的文件的路径和文件的后缀名，就是controller方法中返回的对象。

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       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.xsd
             http://www.springframework.org/schema/mvc
             http://www.springframework.org/schema/mvc/spring-mvc.xsd
             http://www.springframework.org/schema/context
             http://www.springframework.org/schema/context/spring-context.xsd
        ">

    <context:component-scan base-package="com.spring">context:component-scan>

    <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/pages/">property>
        <property name="suffix" value=".jsp">property>
     bean>

    <mvc:annotation-driven/>
beans> 

controller类
@Controller在IOC容器中创建对象，@RequestMapping映射的地址。

package com.spring.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class controller {
    @RequestMapping(path = "/hello")
    public String sayHellow(){
        System.out.println("hellow springMVC");
        return "success";
    }
}

index.jsp

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2019/6/28
  Time: 13:46
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Titletitle>
head>
<body>
<a href="hello">asdasda>
<p>哈哈哈哈p>
body>
html>

success.jsp

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2019/6/28
  Time: 14:03
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Titletitle>
head>
<body>
        <p>successp>
body>
html>

输入：http://localhost:8080/springMVC/。
当然这里的配置也和你的tomcat配置有关系。
运行就可以到达效果，这里不在演示。