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