怎样快速入门SpringMVC

目录

1.springmvc的简介和配置

2.Springmvc之helloworld实现

 3.CRUD之常用注解及返回值

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1.springmvc的简介和配置

        什么是springmvc？

 Spring Web MVC是一种基于Java的实现了MVC设计模式的、请求驱动类型的、轻量级Web框架。

导入pom依赖：

        org.springframework

        spring-webmvc

        ${spring.version}

     

缺少下面的这两个jar包会报java.lang.NoClassDefFoundError: javax/servlet/jsp/jstl/core/Config

原因：org.springframework.web.servlet.view.JstlView在视图解析时需要这二个jar包

          jstl
          jstl
          1.2
      
      
          taglibs
          standard
          1.1.2
      

2.Springmvc之helloworld实现

第一个springMVC程序：HelloWorld

配置文件配置：

1.扫描base-package

[ 定义注解扫描，开启注解扫描，开启动态扫描]

2.配置视图解析器

本地资源视图解析器：internalResourceViewResolver

springmvc-servlet.xml

       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" xmlns:aop="http://www.springframework.org/schema/aop"
       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-4.3.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
   
   
   
   

   
   
   
   

   
   
       
                          value="org.springframework.web.servlet.view.JstlView">
       
       
   

   
   
   
   

 

做静态资源映射

修改web.xml

         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">
  Archetype Created Web Application
 
    contextConfigLocation
    classpath:applicationContext.xml
 
 
 
    org.springframework.web.context.ContextLoaderListener
 

 
 
    SpringMVC
    org.springframework.web.servlet.DispatcherServlet
   
   
      contextConfigLocation
      /WEB-INF/springmvc-servlet.xml
   
    1
   
    true
 
 
    SpringMVC
    /
 

 

       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">
       

 

HelloController:

package com.xbb.ssm.controller;
 
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Controller;
import org.springframework.stereotype.Repository;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
 
import javax.servlet.http.HttpServletRequest;
 
/**
 * 被controller标记的类 会交给 spring 进行管理
 * @Controller
 * @Service
 * @Repository
 * @Component
 * 以上四个都代表 当前类 交给Spring容器进行管理
 */
 
@Controller
public class HelloController {
 
//    自定义mvc：浏览器发送请求 http://localhost:8080/hello.action?methodName=hello
//    springmvc：浏览器发送请求 http://localhost:8080/helloReq
//    此处是下面的简写版
    @RequestMapping("/helloReq")
    public String hello(){
        System.out.println("hello springmvc...");
//        /hello.jsp
        return "hello";
    }
 
    @RequestMapping("/hello2")
    public ModelAndView hello2(HttpServletRequest req){
        ModelAndView mv=new ModelAndView();
        mv.setViewName("hello");
        mv.addObject("msg","success");
        return mv;
    }
}
 

hello.jsp:

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2022/8/16
  Time: 17:26
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
    
SpringMVC 你好
${msg}
 

运行效果：

 3.CRUD之常用注解及返回值

        BookController

package com.xbb.ssm.controller;
 
import com.xbb.ssm.biz.BookBiz;
import com.xbb.ssm.model.Book;
import com.xbb.ssm.util.PageBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
 
import javax.servlet.http.HttpServletRequest;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
 
/**
 * @RequestMapping 加在 类上面，称窄化路径，其实相当于包的概念
 */
@Controller
@RequestMapping("/book")
public class BookController {
    @Autowired
    private BookBiz bookBiz;
 
//    http://localhost:8080/book/list
    @RequestMapping
//    @GetMapping=@RequestMapping(value = "/list",method = RequestMethod.GET)
//    @PostMapping
//    @DeleteMapping
//    @PutMapping
    public String hello(HttpServletRequest req){
        System.out.println("hello springmvc...");
        PageBean pageBean=new PageBean();
        pageBean.setRequest(req);
        Map map=new HashMap();
        String bname = req.getParameter("bname");
        map.put("bname",bname);
        List
        req.setAttribute("lst",maps);
        return "hello";
    }
 
    @RequestMapping("/add")
    public String add(Book book){
        this.bookBiz.insertSelective(book);
        return "redirect:/book/list";
    }
 
    @RequestMapping("/edit")
    public String edit(Book book){
        this.bookBiz.insertSelective(book);
        return "redirect:/book/list";
    }
 
    @RequestMapping("/del/{bid}")
    public String del(@PathVariable("bid") Integer bid){
        this.bookBiz.deleteByPrimaryKey(bid);
        return "redirect:/book/list";
    }
}
 

index.jsp:

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2022/8/16
  Time: 21:52
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
    
    "${pageContext.request.contextPath}/book/list?bname=圣墟">查询所有
    "${pageContext.request.contextPath}/book/add?bid=2&bname=sb&price=9.9">增加
    "${pageContext.request.contextPath}/book/edit?bid=2&bname=suibian&price=9.8">修改
    "${pageContext.request.contextPath}/book/del/2">删除
 

hello.jsp:

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2022/8/16
  Time: 17:26
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
    
SpringMVC 你好
${msg}
${lst}
"${lst}" var="l">
    ${l.bid}:${l.bname}
 

运行效果：