springmvc(maven)

maven下运行简单的springmvc

前提

• 在之前的笔记中有maven的安装和配置

具体实现

• 在pom.xml中添加相关依赖包

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
    	<dependency>
    	    <groupId>org.springframework</groupId>
    	    <artifactId>spring-webmvc</artifactId>
    	    <version>5.1.5.RELEASE</version>
    	</dependency>
    	
    	<!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
    	<dependency>
    	    <groupId>org.springframework</groupId>
    	    <artifactId>spring-core</artifactId>
    	    <version>5.1.5.RELEASE</version>
    	</dependency>
    	
    	<!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
    	<dependency>
    	    <groupId>org.springframework</groupId>
    	    <artifactId>spring-context</artifactId>
    	    <version>5.1.5.RELEASE</version>
    	</dependency>
    	
    	<!-- https://mvnrepository.com/artifact/org.springframework/spring-tx -->
    	<dependency>
    	    <groupId>org.springframework</groupId>
    	    <artifactId>spring-tx</artifactId>
    	    <version>5.1.5.RELEASE</version>
    	</dependency>
    	
    	<!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->
    	<dependency>
    	    <groupId>org.springframework</groupId>
    	    <artifactId>spring-beans</artifactId>
    	    <version>5.1.5.RELEASE</version>
    	</dependency>
    	
    	<!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
    	<dependency>
    	    <groupId>org.springframework</groupId>
    	    <artifactId>spring-jdbc</artifactId>
    	    <version>5.1.5.RELEASE</version>
    	</dependency>
    	
    	<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
    	<dependency>
    	    <groupId>mysql</groupId>
    	    <artifactId>mysql-connector-java</artifactId>
    	    <version>8.0.13</version>
    	</dependency>
    	
    	<!-- https://mvnrepository.com/artifact/jstl/jstl -->
    	<dependency>
    	    <groupId>jstl</groupId>
    	    <artifactId>jstl</artifactId>
    	    <version>1.2</version>
    	</dependency>
  

• 在web.xml中

    <!-- springmvc 前端控制器 -->
      <servlet>
      	<servlet-name>springmvc</servlet-name>
      	<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
      	<init-param>
      		<param-name>contextConfigLocation</param-name>
      		<param-value>classpath:springmvc.xml</param-value>
      	</init-param>
      </servlet>
      <servlet-mapping>
      	<servlet-name>springmvc</servlet-name>
      	<url-pattern>*.action</url-pattern>
      </servlet-mapping>
  

• 在springmvc.xml中

    <beans xmlns="http://www.springframework.org/schema/beans"
    	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
    	xmlns:context="http://www.springframework.org/schema/context"
    	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    	xsi:schemaLocation="http://www.springframework.org/schema/beans 
    		http://www.springframework.org/schema/beans/spring-beans-3.2.xsd 
    		http://www.springframework.org/schema/mvc 
    		http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd 
    		http://www.springframework.org/schema/context 
    		http://www.springframework.org/schema/context/spring-context-3.2.xsd 
    		http://www.springframework.org/schema/aop 
    		http://www.springframework.org/schema/aop/spring-aop-3.2.xsd 
    		http://www.springframework.org/schema/tx 
    		http://www.springframework.org/schema/tx/spring-tx-3.2.xsd ">
    		
    	<!-- 配置handler -->
    	<bean name="/userlist.action" class="controller.UserController" />
    		
    	<!-- 适配器 -->
    	<bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter" />	
    		
    	<!-- 映射器 -->
    	<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping" />
    	
    	<!-- 解析器 -->
    	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" />
    		
    </beans>
  

• 编写UserController.java

    package controller;
    
    import java.util.ArrayList;
    import java.util.List;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import org.springframework.web.servlet.ModelAndView;
    import org.springframework.web.servlet.mvc.Controller;
    
    import model.User;
    
    public class UserController implements Controller {
    
    	@Override
    	public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
    		
    		List<User> list = new ArrayList<User>();
    		
    		User user1 = new User();
    		
    		user1.setId(1);
    		user1.setUsername("小明");
    		user1.setUserage(18);
    		user1.setUseraddress("武汉");
    		
    		User user2 = new User();
    		
    		user2.setId(2);
    		user2.setUsername("David");
    		user2.setUserage(20);
    		user2.setUseraddress("American");
    		
    		list.add(user1);
    		list.add(user2);
    		
    		ModelAndView modelAndView = new ModelAndView();
    		
    		modelAndView.addObject("userlist", list);
    		
    		modelAndView.setViewName("/WEB-INF/user/userlist.jsp");
    		
    		return modelAndView;
    	}
    
    }
  

• 编写userlist.jsp

    <%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
    <%@ taglib uri="http://java.sun.com/jsp/jstl/fmt"  prefix="fmt"%>
    <%@ page isELIgnored="false"%>
    <!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>查询用户列表</title>
    </head>
    <body> 
    <form action="${pageContext.request.contextPath }/item/queryItem.action" method="post">
    查询条件：
    <table width="100%" border=1>
    <tr>
    <td><input type="submit" value="查询"/></td>
    </tr>
    </table>
    用户列表：
    <table width="100%" border=1>
    <tr>
    	<td>用户ID</td>
    	<td>用户姓名</td>
    	<td>用户年龄</td>
    	<td>用户地址</td>
    	<td>操作</td>
    </tr>
    <c:forEach items="${userlist}" var="user" >
    	<tr>
    		<td>${user.id}</td>
    		<td>${user.username}</td>
    		<td>${user.userage}</td>
    		<td>${user.useraddress}</td>
    		
    		<td><a href="${pageContext.request.contextPath }/item/editItem.action?id=${item.id}">修改</a></td>
    	
    	</tr>
    </c:forEach>
    
    </table>
    </form>
    </body>
    
    </html>
  

• 注意事项

  1. 在写jsp的时候，如果要使用jstl，要记得引入相关的东西，例如下面的

      <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
      <%@ taglib uri="http://java.sun.com/jsp/jstl/fmt"  prefix="fmt"%>
     

  2. 如果遇到el表达式出不来的情况，要记得写一句

      <%@ page isELIgnored="false"%>
     

目录结构

运行结果