springmvc学习(三)：注解方式

一、web.xml

没有变化

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>
            org.springframework.web.servlet.DispatcherServlet
        </servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

二、配置文件

去掉多余，新增扫描包

<?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: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/context        
    http://www.springframework.org/schema/context/spring-context-3.0.xsd">
     
    <!-- 扫描包 -->
    <context:component-scan base-package="controller"></context:component-scan>
    <!-- 视图定位   -->
    <bean id="irViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    	<property name="prefix" value="/WEB-INF/page/"></property>
    	<property name="suffix" value=".jsp"></property>
    </bean>
</beans>

三、控制类

加上注解两个

package controller;

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

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
//包不要导错了
import org.springframework.web.servlet.ModelAndView;

//表示这是一个控制器
@Controller
public class HelloController {
	//表示/hello会映射到该方法上
	@RequestMapping("/hello")
	public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
		ModelAndView mav = new ModelAndView("hello");
		mav.addObject("helloMessage","Hello World!");
		return mav;
	}
}

四、jsp

没有变化

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8" isELIgnored="false"%>
 
<h1>${helloMessage}</h1>

五、新增--客户端跳转

只需在控制器新增jump方法即可

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

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
//包不要导错了
import org.springframework.web.servlet.ModelAndView;

//表示这是一个控制器
@Controller
public class HelloController {
	//表示/hello会映射到该方法上
	@RequestMapping("/hello")
	public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
		ModelAndView mav = new ModelAndView("hello");
		mav.addObject("helloMessage","Hello World!");
		return mav;
	}
	//新增此方法
	@RequestMapping("/jump")
        public ModelAndView jump() {
               ModelAndView mav = new ModelAndView("redirect:/hello");
               return mav;
        }   
}