同样是WebProject,这里用到的是spring-framework-3.1.1.RELEASE
一、首先是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">
<servlet>
<servlet-name>jadyer</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>jadyer</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
二、然后是SpringMVC的配置文件jadyer-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:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<!-- 启动Spring的组件自动扫描机制。Spring会自动扫描base-package指定的包中的类和子包里面类 -->
<!-- 此处可参考我的文章http://blog.csdn.net/jadyer/article/details/6038604 -->
<context:component-scan base-package="com.jadyer"/>
<!-- 启动SpringMVC的注解功能,它会自动注册HandlerMapping、HandlerAdapter、ExceptionResolver的相关实例 -->
<mvc:annotation-driven/>
<!-- 由于web.xml中设置是:由SpringMVC拦截所有请求,于是在读取静态资源文件的时候就会受到影响(说白了就是读不到) -->
<!-- 经过下面的配置,该标签的作用就是:所有页面中引用"/css/**"的资源,都会从"/resources/styles/"里面进行查找 -->
<!-- 我们可以访问http://IP:8080/xxx/css/my.css和http://IP:8080/xxx/resources/styles/my.css对比出来 -->
<mvc:resources mapping="/css/**" location="/resources/styles/"/>
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!-- viewClass属性可以用来指定前台在解析数据时,所允许采用的手段。实际上其默认值就是JstlView -->
<!-- 将来有需要的话,就可以在这里把JstlView改成其它的,如FreeMarkerView,VelocityView,TilesView -->
<!-- <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/> -->
<!-- 若Controller的方法返回"user/addSuccess",则SpringMVC自动找/WEB-INF/jsp/user/addSuccess.jsp -->
<property name="prefix" value="/WEB-INF/jsp/"/>
<property name="suffix" value=".jsp"/>
</bean>
</beans>
三、接下来是用于响应请求结果的//WEB-INF//jsp//addSuccess.jsp
<%@ page language="java" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<link rel="stylesheet" type="text/css" href="<%=request.getContextPath()%>/css/my.css">
welcome: ${aaa_name}、${bbb_name}、${string}
<br/>
<c:choose>
<c:when test="${aaa_name=='aaa_jadyer'}">
From:/mydemo/sayaaa
</c:when>
<c:when test="${bbb_name=='bbb_jadyer'}">
From:/mydemo/saybbb${sessionScope.loginUser}
</c:when>
<c:otherwise>
From:others
</c:otherwise>
</c:choose>
<br/>
${redirectName}
四、这是我们的样式文件//resources//styles//my.css
body{
font-size:30px;
}
五、最后是最为核心的UserController.java
package com.jadyer.controller;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
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.mvc.support.RedirectAttributes;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
/**
* UserController
* @author http://blog.csdn.net/jadyer
* @create Apr 20, 2012 1:23:29 AM
*/
@Controller //指明这是一个Controller
@RequestMapping(value="/mydemo") //类似于命名空间,即访问该Controller时必须加上"/mydemo"在前面
//只要下面的方法中执行model.addAttribute("loginUser","jadyer")那么"loginUser"便被自动放到HttpSession
@SessionAttributes("loginUser")
public class UserController {
/**
* @see 如果在类上指定@RequestMapping并给了值,而在方法上指定@RequestMapping但不给值
* @see 这时,以下的两种请求方式,都会被分发到该方法上
* @see 第一种:'http://127.0.0.1:8088/SpringMVC_study/mydemo'
* @see 第二种:'http://127.0.0.1:8088/SpringMVC_study/mydemo/'
* @see 但,如果我们在某个方法上明确指定了@RequestMapping(value="/"),则第二种请求会被分发到该方法上
*/
@RequestMapping
public String login(){
System.out.println("login() is invoked");
return "addSuccess";
}
@RequestMapping(value={"/","/add"}) //即访问"/mydemo/"或者"/mydemo/add",便自动访问该方法
public String addUser(){
System.out.println("addUser() is invoked");
return "addSuccess"; //return逻辑视图
}
/**
* 简述如何接收前台参数,以及@RequestParam的使用
*/
//这里@RequestParam("userID")表明在访问该方法时,必须传个参数过来,并且参数名必须是int型的userID
//以下三种情况会导致服务器返回HTTP Status 400
//1)没有传任何参数2)传的参数中没有名为userID的参数3)传了userID参数但其参数值无法转换为int型
@RequestMapping(value={"/delete"})
public String deleteUser(@RequestParam("userID") int userID){
System.out.println("===============" + userID);
return "addSuccess";
}
//这里@RequestParam表明在访问该方法时,至少要把userName参数传过来,否则服务器返回HTTP Status 400
@RequestMapping("/edit")
public String editUser(@RequestParam String userName){
System.out.println("===============" + userName);
return "addSuccess";
}
//这种情况下,无论传不传userName参数,都可以访问到该方法。如果没有传userName,则打印出来的值就是null
//这里method=RequestMethod.GET用于指定需要以GET方式访问该方法,注意两个以上属性时就要明确value值了
@RequestMapping(value="/modify", method=RequestMethod.GET)
public String modifyUser(String userName){
System.out.println("===============" + userName);
return "addSuccess";
}
/**
* 简述如何返回参数给前台,以及前台如何获取参数
*/
@RequestMapping("/sayaaa")
public String sayAaa(String userName, Map<String,Object> map){
map.put("aaa_name", "aaa_jadyer"); //此时前台使用${aaa_name}即可取值
return "addSuccess";
}
@RequestMapping("/saybbb")
public String sayBbb(String userName, Model model){
model.addAttribute("bbb_name", "bbb_jadyer"); //此时前台使用${bbb_name}即可取值
model.addAttribute("loginUser","jadyer"); //由于@SessionAttributes,故loginUser会被自动放到HttpSession中
return "addSuccess";
}
@RequestMapping("/sayccc")
public String sayCcc(String userName, Model model){
model.addAttribute("ccc_jadyer"); //此时默认以Object类型作为key,即String-->string,故前台使用${string}即可取值
return "addSuccess";
}
/**
* 简述如何获取javax.servlet.http.HttpServletRequest、HttpServletResponse、HttpSession
*/
@RequestMapping("/eat")
public String eat(HttpServletRequest request, HttpServletResponse response, HttpSession session){
System.out.println("===============" + request.getParameter("myname"));
System.out.println("===============" + request.getLocalAddr());
System.out.println("===============" + response.getLocale());
System.out.println("===============" + session.getId());
return "addSuccess";
}
/**
* 简述客户端跳转时,传参的传递
* @see 注意:这种情况下的参数,并不是放到HttpSession中的,不信你可以试一下
* @see 注意:即先访问/mydemo/sleep之后,再直接访问/mydemo/eat
*/
@RequestMapping("/sleep")
public String sleep(RedirectAttributes ra){
ra.addFlashAttribute("redirectName", "redirectValue");
//等同于return "redirect:/mydemo/eat"; //两种写法都要写绝对路径,而SpringMVC都会为其自动添加应用上下文
return InternalResourceViewResolver.REDIRECT_URL_PREFIX + "/mydemo/eat";
}
}