SSM学习42：SpringMVC入门案例（重点）

目录

创建SpringMVC项目

 目录

补全目录结构 ：添加java项结构

导入jar包

添加tomcat运行快捷键

创建配置类 SpringMvcConfig.class

创建Controller类

使用配置类ServletConfig替换web.xml

运行结果

---

因为SpringMVC是一个Web框架，将来是要替换Servlet,所以先来回顾下以前Servlet是如何进行开发的?

1.创建web工程(Maven结构)

2.设置tomcat服务器，加载web工程(tomcat插件)

3.导入坐标(Servlet)

4.定义处理请求的功能类(UserServlet)

5.设置请求映射(配置映射关系)

SpringMVC的制作过程和上述流程几乎是一致的，具体的实现流程是什么?

1.创建web工程(Maven结构)

2.设置tomcat服务器，加载web工程(tomcat插件)

3.导入坐标(==SpringMVC==+Servlet)

4.定义处理请求的功能类(==UserController==)

5.==设置请求映射(配置映射关系)==

6.==将SpringMVC设定加载到Tomcat容器中==

 

创建SpringMVC项目

 目录

补全目录结构 ：添加java项结构

 

导入jar包

将pom.xml中多余的内容删除掉，再添加SpringMVC需要的依赖

"1.0" encoding="UTF-8"?>
 
<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.itheimagroupId>
  <artifactId>SpringMVCartifactId>
  <version>1.0-SNAPSHOTversion>
  <packaging>warpackaging>
 
  <name>SpringMVC 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>
  properties>
 
  <dependencies>
    <dependency>
      <groupId>junitgroupId>
      <artifactId>junitartifactId>
      <version>4.11version>
      <scope>testscope>
    dependency>
    <dependency>
      <groupId>javax.servletgroupId>
      <artifactId>javax.servlet-apiartifactId>
      <version>3.1.0version>
      <scope>providedscope>
    dependency>
    <dependency>
      <groupId>org.springframeworkgroupId>
      <artifactId>spring-webmvcartifactId>
      <version>5.2.1.RELEASEversion>
    dependency>
  dependencies>
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.tomcat.mavengroupId>
        <artifactId>tomcat7-maven-pluginartifactId>
        <version>2.1version>
        <configuration>
          <port>80port>
          <path>/path>
        configuration>
      plugin>
    plugins>
  build>
 
project>

添加tomcat运行快捷键

创建配置类 SpringMvcConfig.class

package com.itheima.config;
 
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
 
@Configuration
@ComponentScan("com.itheima.controller")
public class SpringmvcConfig {
}

创建Controller类

package com.itheima.controller;
 
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
 
//@Controller：Springmvc的bean标志
@Controller
public class UserController {
    @RequestMapping("/save")
    @ResponseBody
    public String save(){
        System.out.println("郭浩康第一个Sprintmvc项目创建成功");
        return "{spring1save()...}";
    }
}

使用配置类ServletConfig替换web.xml

将web.xml删除，换成ServletContainersInitConfig

package com.itheima.config;
 
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
import org.springframework.web.servlet.support.AbstractDispatcherServletInitializer;
 
public class ServletConfig extends AbstractDispatcherServletInitializer {
    //加载Springmvc容器
    @Override
    protected WebApplicationContext createServletApplicationContext() {
        AnnotationConfigWebApplicationContext ctx=new AnnotationConfigWebApplicationContext();
        ctx.register(SpringmvcConfig.class);
        return ctx;
    }
//设置请求处理
    @Override
    protected String[] getServletMappings() {
        return new String[]{"/"};
    }
//加载Spring容器
    @Override
    protected WebApplicationContext createRootApplicationContext() {
        return null;
    }
}

运行结果