Spring-mvc的基本配置

1.导入相关依赖

    4.0.0

    org.example
    Spring-MVC
    pom
    1.0-SNAPSHOT
    
        Spring-MVC-01
        Spring-MVC-02
    

    
        
            org.springframework
            spring-webmvc
            5.3.18
        
        
            javax.servlet
            servlet-api
            2.5
        
        
            javax.servlet.jsp
            jsp-api
            2.1
        
        
            junit
            junit
            4.12
        
        
            javax.servlet.jsp.jstl
            jstl-api
            1.2
        
        
    
    
    
        
            src/main/java
            
                ***.properties
            
        

        
            src/main/resources
            
                ***.properties
            
        
    

2.配置web.xml, 注册DispatcherServlet

   
   
       springmvc
       org.springframework.web.servlet.DispatcherServlet
       
       
           contextConfigLocation
           classpath:springmvc-servlet.xml
       
       
       1
   

   
   
   
       springmvc
       /
   

4.编写spring-mvc配置文件

5.编写我们要操作业务Controller ，要么实现Controller接口，要么增加注解；需要返回一个ModelAndView，装数据，封视图；

package com.kuang.controller;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

//注意：这里我们先导入Controller接口
public class HelloController implements Controller {
   public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
       //ModelAndView 模型和视图
       ModelAndView mv = new ModelAndView();

       //封装对象，放在ModelAndView中。Model
       mv.addObject("msg","HelloSpringMVC!");
       //封装要跳转的视图，放在ModelAndView中
       mv.setViewName("hello"); //: /WEB-INF/jsp/hello.jsp
       return mv;
  }
}

1.web.xml

    
        springmvc
        org.springframework.web.servlet.DispatcherServlet
        
            contextConfigLocation
            classpath:spring-mvc-servlet.xml
        
        1
    
    
    
        springmvc
        /
    

2.spring-mvc.xml

3.编写Controller

package com.txy.controller;

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

// 这个注解所标注的类中方法如果返回的是字符串，并且有具体页面可以跳转，就会被视图解析器解析
@Controller
@RequestMapping("/hello") // 请求路径
public class HelloSpringMvc {
    @RequestMapping("/h1")
    public String hello(Model model)
    {
        model.addAttribute("msg", "hello mvc");
        return "hello"; // 视图解析器解析返回字符串
    }
}

1.依赖未导入项目
查看下图中项目内是否存在lib目录，且所有依赖是否导入，若没有lib目录，则在WEB-INF下创建lib目录，并导入所有依赖