1. SpringMVC 入门例子

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本系列入门学习参考极客学院Spring入门系列视频学习记录总结而来

MVC 是一种使用 MVC（Model View Controller 模型-视图-控制器）设计创建 Web 应用程序的模式：

Model（模型）表示应用程序核心（比如数据库记录列表）
View（视图）显示数据（数据库记录）
Controller（控制器）处理输入（写入数据库记录）

这里写图片描述

Spring MVC是基于Model 2实现的技术框架：

这里写图片描述

实现一个入门例子：
添加springmvcjar：

<properties>    <spring.version>4.0.5.RELEASE</spring.version>    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>    <java.version>1.7</java.version></properties><dependencies>    <dependency>        <groupId>org.springframework</groupId>        <artifactId>spring-webmvc</artifactId>        <version>${spring.version}</version>    </dependency>    <dependency>        <groupId>org.springframework</groupId>        <artifactId>spring-tx</artifactId>        <version>${spring.version}</version>    </dependency></dependencies>

配置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" xmlns:jsp="http://java.sun.com/xml/ns/javaee/jsp"    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"    version="3.0">    <display-name></display-name>    <listener>        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>    </listener>    <context-param>        <param-name>contextConfigLocation</param-name>        <param-value>classpath*:applicationContext.xml</param-value>    </context-param>    <servlet>        <servlet-name>spring</servlet-name>        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>        <init-param>            <param-name>contextConfigLocation</param-name>            <param-value>/WEB-INF/spring-mvc.xml</param-value>        </init-param>    </servlet>    <servlet-mapping>        <servlet-name>spring</servlet-name>        <url-pattern>*.html</url-pattern>    </servlet-mapping></web-app>

配置springmvc.xml

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"    xmlns:p="http://www.springframework.org/schema/p" 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"    xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">    <context:component-scan base-package="com.dragon" /></beans>

编写login.jsp和success.jsp：
login.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!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>登录</title></head><body>    <form action="login.html" method="post">        <p>            用户名： <input name="uname" type="text">        </p>        <p>            密&nbsp;&nbsp;码： <input name="upasswd" type="password">        </p>        <p>            <input type="submit">        </p>    </form>    <font color="red">${error}</font></body></html>

success.jsp:

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!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>登录成功</title></head><body>    <h1>登录成功</h1></body></html>

编写controller：

import javax.annotation.Resource;import javax.servlet.http.HttpServletRequest;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.servlet.ModelAndView;import com.dragon.springmvc.service.LoginService;@Controllerpublic class LoginController {    @Resource    LoginService service;    @Resource    HttpServletRequest request;    @RequestMapping("index")    public ModelAndView toLoginPage(){        return new ModelAndView("WEB-INF/jsp/login.jsp");    }    @RequestMapping("login")    public ModelAndView doLogin(){        String loginPageUrl = "WEB-INF/jsp/login.jsp";        String successPageUrl = "WEB-INF/jsp/success.jsp";        String uname = request.getParameter("uname");        String upasswd = request.getParameter("upasswd");        return service.doLogin(loginPageUrl, successPageUrl, uname, upasswd);    }}

编写service：

import org.springframework.stereotype.Service;import org.springframework.web.servlet.ModelAndView;@Servicepublic class LoginService {    public ModelAndView doLogin(String loginPageUrl, String successPageUrl, String uname, String upasswd) {        if (uname == null || "".equals(uname)) {            return new ModelAndView(loginPageUrl, "error", "用户名不能为空");        }        if (upasswd == null || "".equals(upasswd)) {            return new ModelAndView(loginPageUrl, "error", "密码不能为空");        }        // uname = admin , passwd = 123        if (uname.equals("admin") && upasswd.equals("123")) {            return new ModelAndView(successPageUrl);        }        return new ModelAndView(loginPageUrl, "error", "用户名或者密码错误");    }}

最终目录结构：
这里写图片描述

结果就不演示了

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