SpringMvc环境搭建

springmvc 执行原理 
页面发送请求，控制器根据请求找到相应的映射（方法），执行功能后，根据返回结果，经过视图解析器处理，跳转到相应页面，呈现处理结果。

环境搭建步骤 
1、导入相关 jar 包 
百度云自取 搭建springmvc需要的jar包

2、在 web.xml 中配置 dispatchServlet

<?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">

    <!-- 配置 DispatcherServlet -->
    <servlet>
        <servlet-name>springDispatcherServlet</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>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springDispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

</web-app>

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3、编写 springmvc.xml 文件，配置 视图解析器

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://www.springframework.org/schema/beans" 
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="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 
                        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd ">

    <!-- 自动扫描 -->
    <context:component-scan base-package="com.xiao.leave"></context:component-scan>

    <!-- 配置视图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/view/"></property>
        <property name="suffix" value=".jsp"/>
    </bean>


</beans>

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4、编写控制器和相关页面

import java.util.Arrays;
import java.util.Date;
import java.util.Map;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.SessionAttributes;
import org.springframework.web.servlet.ModelAndView;

import com.xiao.leave.entities.Students;

@SessionAttributes(value={"stu"},types={String.class})
@Controller
@RequestMapping("/login")
public class LonginAction {
    private static final String SUCCESS = "success";



    @RequestMapping("/testSessionAttribute")
    public String testSessionAttribute(Map<String, Object> map){
        Students stu = new Students("xiao", 24, "123456");
        map.put("stu", stu);
        map.put("addr", "北京");

        return SUCCESS;
    }

    @RequestMapping("/testModelAndView")
    public ModelAndView testModelAndView(){
        String viewName = SUCCESS;
        ModelAndView modelandview = new ModelAndView(viewName);
        modelandview.addObject("time",new Date());

        return modelandview;
    }

    @RequestMapping("/testMap")
    public String testMap(Map<String, Object> map){
        map.put("names", Arrays.asList("tom", "mike", "lily"));
        System.out.println(map.getClass().getName());

        return SUCCESS;
    }

    @RequestMapping("/testPojo")
    public String testPojo(Students stu){
        System.out.println("Student:" + stu);

        return SUCCESS;
    }

    @RequestMapping("testRequestParam")
    public String testRequestParam(@RequestParam(value="username") String un, 
                                    @RequestParam(value="age",required=false,defaultValue="0") int age){
        /**
         * RequestParam 映射请求参数
         * value:请求参数的参数名
         */
        System.out.println("testRequestParam: username = " + un + ", age = " + age);

        return SUCCESS;
    }

    @RequestMapping("/testPathVariable/{id}")
    public String testPathVariable(@PathVariable("id")Integer id){
        //PathVariable 可以映射 url 中占位符到目标方法的参数中
        System.out.println("testPathVariable  ==" + id);

        return SUCCESS;
    }

    @RequestMapping("testAntPath/*/aa")
    public String testAntPath(){
        // * 匹配任意个字符，？ 匹配一个字符，** 匹配多层路径

        System.out.println("testAntPath");

        return SUCCESS;
    }

    @RequestMapping(value="/testparaAndMethod", params={"username","age!=10"}, method=RequestMethod.POST)
    public String testparaAndMethod(){
        /**
         * value表示请求路径的映射
         * params表示传入的参数；！=表示有该参数，但是不等于某值，
         * method表示请求方式
         */

        System.out.println("testparaAndMethod");

        return SUCCESS;
    }

    @RequestMapping("/helloworld")
    public String helloworld(){
        System.out.println("helloworld");

        return SUCCESS;
    }

}

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success.jsp

<body>
    <h2>恭喜！登录成功</h2>

    <h4>names: ${requestScope.names} </h4>

    <h4>time: ${requestScope.time} </h4>

    <h4>request stu: ${requestScope.stu} </h4>

    <h4>session stu: ${sessionScope.stu} </h4>

    <h4>request addr: ${requestScope.addr} </h4>

    <h4>session addr: ${sessionScope.addr} </h4>


  </body>

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login.jsp

  <body>

    <a href="login/testSessionAttribute">testSessionAttribute</a><br/>

    <a href="login/testModelAndView">testModelAndView</a><br/>

    <a href="login/testMap">testMap</a><br/>

    <form action="login/testPojo">
        姓名：<input type="text" name="sname"><br/>
        年龄：<input type="text" name="sage"><br/>
        手机：<input type="text" name="stel"><br/>
        省份：<input type="text" name="saddr.province"><br/>
        城市：<input type="text" name="saddr.city"><br/>

        <input type="submit" value="提交">
    </form>

    <a href="login/testRequestParam?username=xiao&age=24">testRequestParam</a><br>

    <a href="login/testPathVariable/1">testPathVariable</a><br/>

    <a href="login/testAntPath/hello/aa">testAntPath</a><br/>

    <form action="login/testparaAndMethod?username=xiao&age=11" method="post">
        <input type="submit" value="登录"/>
    </form>

    <a href="login/helloworld">hello world</a><br/>
  </body>
</html>

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点击 login.jsp 中的链接，能成功跳转到 success.jsp 页面，则说明环境搭建成功！（testPojo 需要写一个 pojo，加入get set toString 方法）