javaee springMVC 一个案例

项目结构

pom.xml

<?xml version="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>4.0.0</modelVersion><groupId>org.example</groupId><artifactId>TestSpringMVC3</artifactId><version>1.0-SNAPSHOT</version><packaging>war</packaging><name>TestSpringMVC3 Maven Webapp</name><!-- FIXME change it to the project's website --><url>http://www.example.com</url><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><maven.compiler.source>1.7</maven.compiler.source><maven.compiler.target>1.7</maven.compiler.target></properties><dependencies><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.11</version><scope>test</scope></dependency><!-- Spring --><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>4.3.18.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-core</artifactId><version>4.3.18.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-beans</artifactId><version>4.3.18.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-context-support</artifactId><version>4.3.18.RELEASE</version></dependency><!-- 导入SpringMvc 需要的jar包 --><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>4.3.18.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-web</artifactId><version>4.3.18.RELEASE</version></dependency><!-- 配置servlet--><dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>3.1.0</version><scope>provided</scope></dependency><!-- jstl --><dependency><groupId>javax.servlet</groupId><artifactId>jstl</artifactId><version>1.2</version></dependency><!-- 1.2以下的版本 需要加standard架包 --><!--<dependency><groupId>taglibs</groupId><artifactId>standard</artifactId><version>1.1.2</version></dependency>--><!--配置jsp的依赖 --><dependency><groupId>javax.servlet.jsp</groupId><artifactId>jsp-api</artifactId><version>2.2</version><scope>provided</scope></dependency></dependencies><build><finalName>TestSpringMVC3</finalName><pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) --><plugins><plugin><artifactId>maven-clean-plugin</artifactId><version>3.1.0</version></plugin><!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging --><plugin><artifactId>maven-resources-plugin</artifactId><version>3.0.2</version></plugin><plugin><artifactId>maven-compiler-plugin</artifactId><version>3.8.0</version></plugin><plugin><artifactId>maven-surefire-plugin</artifactId><version>2.22.1</version></plugin><plugin><artifactId>maven-war-plugin</artifactId><version>3.2.2</version></plugin><plugin><artifactId>maven-install-plugin</artifactId><version>2.5.2</version></plugin><plugin><artifactId>maven-deploy-plugin</artifactId><version>2.8.2</version></plugin></plugins></pluginManagement></build>
</project>

springmvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:p="http://www.springframework.org/schema/p"xmlns:context="http://www.springframework.org/schema/context"xmlns:mvc="http://www.springframework.org/schema/mvc"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd"><!-- 1. 配置  需要扫描的控制层在哪个包  --><context:component-scan base-package="com.test"></context:component-scan><!-- 2 配置 视图解析器 中的 前缀和后缀  --><bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"><!-- 设置前缀  --><property name="prefix" value="/WEB-INF/"/><!-- 设置后缀 --><property name="suffix" value=".jsp"/></bean><!-- 开启注解驱动注册了两个数据转换的注解@NumberFormatannotation支持，@DateTimeFormatjson相关的。。--><mvc:annotation-driven></mvc:annotation-driven></beans>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns="http://java.sun.com/xml/ns/javaee"xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"id="WebApp_ID" version="3.0"><display-name>Archetype Created Web Application</display-name><!-- 加入前端控制器 DispatcherServlet --><servlet><servlet-name>dispatcherServlet</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><!-- 设置 DispatcherServlet 的参数 --><init-param><param-name>contextConfigLocation</param-name><param-value>classpath:springmvc.xml</param-value></init-param><!-- 1 启动服务器的时候就加载  --><!-- 0 使用的时候再加载 --><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>dispatcherServlet</servlet-name><url-pattern>/</url-pattern></servlet-mapping></web-app>

index.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<body>
<h2>Hello World!</h2>
<c:if test="${loginUser==null}">请<a href="users/loginUi">登录</a>
</c:if>
<c:if test="${loginUser!=null}">${loginUser.uname}，欢迎您!
</c:if>
</body>
</html>

login.jsp

<%--Created by IntelliJ IDEA.User: 呆萌老师:QQ:2398779723Date: 2019/12/6Time: 11:53To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%String baseurl=request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+request.getContextPath();pageContext.setAttribute("baseurl",baseurl);
%><html>
<base href="${baseurl}" />
<head><title>Title</title>
</head>
<body>
<!-- http://localhost:8080/testSpringMvc4-->
<form action="${baseurl}/users/checkLogin" method="post"><pre>${baseurl}用户名：<input type="text" name="uname" />密码:<input type="password" name="pwd" /><input type="submit" name="sub" value="登录" /></pre></form>
</body>
</html>

User.java

package com.test.pojo;public class Users {private int uid;private String uname;private String pwd;public int getUid() {return uid;}public void setUid(int uid) {this.uid = uid;}public String getUname() {return uname;}public void setUname(String uname) {this.uname = uname;}public String getPwd() {return pwd;}public void setPwd(String pwd) {this.pwd = pwd;}@Overridepublic String toString() {return "Users{" +"uid=" + uid +", uname='" + uname + '\'' +", pwd='" + pwd + '\'' +'}';}
}

UserController

package com.test.controller;import com.test.pojo.Users;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;@Controller
@RequestMapping("/users")
public class UsersController {@RequestMapping("/loginUi")public String loginUi(){return "login";}@RequestMapping("/checkLogin")public String checkLogin(Users user, HttpServletRequest request){if(user.getUname().equals("daimenglaoshi") && user.getPwd().equals("123")){//存入sessionHttpSession session= request.getSession();session.setAttribute("loginUser",user);//重定向return "redirect:/index.jsp";}elsereturn "login";}}