1、第一个SpringMVC程序

1、创建如下项目结构

2、在src下的com.springmvc下创建User.java

package com.springmvc;

public class User {
    private String uname;

    public String getUname() {
        return uname;
    }

    public void setUname(String uname) {
        this.uname = uname;
    }

    @Override
    public String toString() {
        return "User [uname=" + uname + "]";
    }


}

3、在src下的com.springmvc下创建MVCController.java

package com.springmvc;

import java.io.IOException;

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

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


/**
 * @Controller 标注控制类，负责注册一个bean到spring上下文中
 * @RequestMapping 注解为控制器指定可以处理哪些 URL 请求
 * http://MVCController/hello
 *
 */
@Controller
public class MVCController {
    /*所有方法的return 返回的是页面视图的名称*/
    
    //1.自动匹配参数
    @RequestMapping("/hello.do")
    public String hello(HttpServletRequest request,HttpServletResponse response) throws IOException{
        //跳转页面
        return "/index.jsp";
    }
    //2.自动匹配参数,传递一个参数
    @RequestMapping("/login.do")
    public void login(HttpServletResponse response,String uname) throws IOException{
        //login的页面，uname是表单的name属性名
        System.out.println("登录通过String参数接用户名:"+uname); 
        //跳转方式1：
            response.sendRedirect("index.jsp");
    }
    //2.自动匹配参数
    @RequestMapping("/register.do")
    public void test(HttpServletResponse response,User user) throws IOException{
        //register页面的name属性名只要和User类的属性名保持一致，这里参数拿对象接就好，
        //这里register页面的name属性名中不用写user.属性名，不能像stuts2注入对象一样
        System.out.println("登录通过User对象参数接用户名:"+user); 
        //跳转方式1：
        response.sendRedirect("index.jsp");
    }
    
    
}

4、在WebRoot下的WEB-INF下创建springmvc-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" 
xmlns:aop="http://www.springframework.org/schema/aop" 
xmlns:context="http://www.springframework.org/schema/context" 
xmlns:tx="http://www.springframework.org/schema/tx" 
xmlns:mvc="http://www.springframework.org/schema/mvc" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop 
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/context 
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd 
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd ">
  <!--  1.配置要自动扫描的包 -->
  <context:component-scan base-package="com.springmvc"/>
  
  <!-- 2.支持spingmmvc注解,自动匹配 -->
  <mvc:annotation-driven/>
  
  <!-- 3.如果当前请求为“/”时，则转发到“mvc/hello” 也就是默认首启项的设置,web.xml欢迎页面节点可以啥也不写-->
  <!-- <mvc:view-controller path="/" view-name="forward:/mvc/hello"/> -->
    


</beans>

5、编辑WebRoot下的WEB-INF下的web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
    <!-- SpringMVC的配置 -->
    <servlet>
      <servlet-name>springmvc</servlet-name>
      
      <!-- DispatcherServlet是前置控制器，配置在web.xml文件中的。拦截匹配的请求，
      Servlet拦截匹配规则要自已定义，把拦截下来的请求，依据相应的规则分发到目标Controller来处理， -->
      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    </servlet>
    <servlet-mapping>
      <servlet-name>springmvc</servlet-name>
      <url-pattern>*.do</url-pattern>
    </servlet-mapping>
    
    <welcome-file-list>
      <welcome-file></welcome-file>
    </welcome-file-list>
</web-app>

6、在WebRoot下创建login.jsp

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
  </head>
  
  <body>
     <form action="login.do" method="post">
       user:<input type="text" name="uname"/>
       <input type="submit" value="ok"/>
     </form>
  </body>
</html>

7、在WebRoot下创建register.jsp

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
  </head>
  
  <body>
     <form action="register.do" method="post">
       user:<input type="text" name="uname"/>
       <input type="submit" value="ok"/>
     </form>
  </body>
</html>

8、在WebRoot下创建index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'login.jsp' starting page</title>
    
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->

  </head>
  
  <body>
     操作成功！
  </body>
</html>

9、运行效果如下

(1)直接通过浏览器访问hello.do

(2)登录时，后台用String参数名接值

(3)注册时，后台用User对象参数接值