springmvc的3中路径风格

1.导入相应的jar包,文件放置情况

2.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>springmvc7</display-name>
   <welcome-file-list>
     <welcome-file>index.jsp</welcome-file>
   </welcome-file-list>
   <servlet>
       <servlet-name>mvc-dispatcher</servlet-name>
       <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
       <!-- DispatcherServlet对应的上下文配置,默认/WEB-INF/$servlet-name$-servlet.xml
           下面配置spring-mvc的核心配置文件
        -->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/configs/spring/mvc-dispatcher-servlet.xml</param-value>
        </init-param>
       <load-on-startup>1</load-on-startup>
   </servlet>
   <servlet-mapping>
       <servlet-name>mvc-dispatcher</servlet-name>
       <!-- mvc-dispatcher 拦截所有的请求 -->
       <url-pattern>/</url-pattern>
   </servlet-mapping>

 </web-app>

3.mvc-dispatcher-servlet.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"
     xmlns:tx="http://www.springframework.org/schema/tx"
     xmlns:aop="http://www.springframework.org/schema/aop"
     xsi:schemaLocation="
         http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans.xsd
         http://www.springframework.org/schema/context
         http://www.springframework.org/schema/context/spring-context.xsd
         http://www.springframework.org/schema/mvc
         http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
         http://www.springframework.org/schema/tx
         http://www.springframework.org/schema/tx/spring-tx.xsd
         http://www.springframework.org/schema/aop
         http://www.springframework.org/schema/aop/spring-aop.xsd">

 <!-- 激活
      @Required
      @Autowired,jsr250's
      @PostConstruct,
      @PreDestroy and @ Resource等标注
  -->
 <context:annotation-config />
 <!--
     DispatcherServlet上下文,只搜索@Controller标注的类,不搜索其他标注的类
  -->
 <context:component-scan base-package="com.gys.mvcdemo">
     <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
 </context:component-scan>

 <!-- 

     HandlerMapping无需配置,Spring MVC可以默认启动
  -->
  <!--
      扩充了注解驱动,可以将请求参数绑定到控制器参数
     启用基于annotation的handlerMapping.
   -->
 <mvc:annotation-driven />

 <!--
     静态资源处理,css,js,imgs
  -->
 <mvc:resources location="/resources/" mapping="/resources/**"/>

 <!-- 视图解析器 -->
 <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
     <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
     <property name="prefix" value="/WEB-INF/jsps/" />
     <property name="suffix" value=".jsp" />
 </bean>

 </beans>

Course.java

 package com.gys.mvcdemo.model;

 public class Course {
     //课程IDd
     private Integer courseId;
     //课程名称
     private String title;
 //图片路径
     private String imgPath;
     //学习人数
     private Integer learningNum;
     //课程时长
     private Long duration;
     //课程难度
     private Integer level;
     //课程描述
     private String levelDesc;
     //课程介绍
     private String descr;
     public Integer getCourseId() {
         return courseId;
     }
     public void setCourseId(Integer courseId) {
         this.courseId = courseId;
     }
     public String getTitle() {
         return title;
     }
     public void setTitle(String title) {
         this.title = title;
     }
     public String getImgPath() {
         return imgPath;
     }
     public void setImgPath(String imgPath) {
         this.imgPath = imgPath;
     }
     public Integer getLearningNum() {
         return learningNum;
     }
     public void setLearningNum(Integer learningNum) {
         this.learningNum = learningNum;
     }
     public Long getDuration() {
         return duration;
     }
     public void setDuration(Long duration) {
         this.duration = duration;
     }
     public Integer getLevel() {
         return level;
     }
     public void setLevel(Integer level) {
         this.level = level;
     }
     public String getLevelDesc() {
         return levelDesc;
     }
     public void setLevelDesc(String levelDesc) {
         this.levelDesc = levelDesc;
     }
     public String getDescr() {
         return descr;
     }
     public void setDescr(String descr) {
         this.descr = descr;
     }

 }

CourseService.java

 package com.gys.mvcdemo.service;

 import com.gys.mvcdemo.model.Course;

 public interface CourseService {
     Course getCoursebyId(Integer courseId);
 }

CourseServiceImpl.java

 package com.gys.mvcdemo.service.impl;

 import org.springframework.stereotype.Service;

 import com.gys.mvcdemo.model.Course;
 import com.gys.mvcdemo.service.CourseService;

 @Service("courseService")
 public class CourseServiceImpl implements CourseService{

     @Override
     public Course getCoursebyId(Integer courseId) {
         Course course=new Course();
         course.setCourseId(courseId);
         course.setTitle("深入浅出Java多线程");
         course.setImgPath("1.jpg");
         course.setLearningNum(123465);
         course.setLevel(2);
         course.setLevelDesc("中级");
         course.setDuration(7200L);
         course.setDescr("多线程是日常开发中的常用知识...........");
         return course;
     }
 }

CourseController.java

 package com.gys.mvcdemo.controller;

 import java.util.Map;

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

 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Controller;
 import org.springframework.ui.Model;
 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 com.gys.mvcdemo.model.Course;
 import com.gys.mvcdemo.service.CourseService;

 @Controller
 @RequestMapping("/courses")
 public class CourseController {

     private CourseService courseService;

     @Autowired
     public void setCourseService(CourseService courseService) {
         this.courseService = courseService;
     }

     // /courses/vies?courseId=123
     @RequestMapping(value="/view",method=RequestMethod.GET)
     public String viewCourse(Model model,@RequestParam("courseId") Integer courseId){
         Course course=courseService.getCoursebyId(courseId);
         model.addAttribute(course);
         return "course_overview";
     }
     // courses/view2/{courseId}
     @RequestMapping(value="/view2/{courseId}",method=RequestMethod.GET)
     public String viewCourse2(@PathVariable("courseId") Integer courseId,Map<String, Object> model){
         Course course=courseService.getCoursebyId(courseId);
         model.put("course",course);
         return "course_overview";
     }

     // courses/view3?courseId=3
     @RequestMapping("view3")
     public String viewCourse3(HttpServletRequest request,HttpServletResponse response){
         Integer courseId=Integer.valueOf(request.getParameter("courseId"));
         Course course=courseService.getCoursebyId(courseId);
         request.setAttribute("course", course);
         return "course_overview";
     }

 }

course_overview.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 'course_overview.jsp' starting page</title>
     <link rel="stylesheet" type="text/css" href="<%=request.getContextPath()%>/resources/css/main.css">
   </head>

   <body>
     <h2>id:${course.courseId }</h2>
     <h2>title:${course.title }</h2>
     <h2>imgPath:<img src="<%=path %>/resources/img/${course.imgPath }" /></h2>
     <h2>learningNum:${course.learningNum }</h2>
     <h2>duration:${course.duration }</h2>
     <h2>level:${course.level }</h2>
     <h2>levelDesc:${course.levelDesc }</h2>
      <h2>descr:${course.descr }</h2>
   </body>
 </html>

用三种路径测试:

http://localhost:8080/springmvc7/courses/view?courseId=1

http://localhost:8080/springmvc7/courses/view2/2

http://localhost:8080/springmvc7/courses/view3?courseId=3