<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

	<modelVersion>4.0.0</modelVersion>

	<groupId>com.ibigsea</groupId>

	<artifactId>springmvc</artifactId>

	<packaging>war</packaging>

	<version>0.0.1-SNAPSHOT</version>

	<name>springmvc</name>

	<url>http://maven.apache.org</url>

	<dependencies>

		<dependency>

			<groupId>org.springframework</groupId>

			<artifactId>spring-core</artifactId>

			<version>${spring_version}</version>

		</dependency>

		<dependency>

			<groupId>org.springframework</groupId>

			<artifactId>spring-web</artifactId>

			<version>${spring_version}</version>

		</dependency>

		<dependency>

			<groupId>org.springframework</groupId>

			<artifactId>spring-webmvc</artifactId>

			<version>${spring_version}</version>

		</dependency>

		<dependency>

			<groupId>org.springframework</groupId>

			<artifactId>spring-context</artifactId>

			<version>${spring_version}</version>

		</dependency>

		<dependency>

			<groupId>org.springframework</groupId>

			<artifactId>spring-aop</artifactId>

			<version>${spring_version}</version>

		</dependency>

		<dependency>

			<groupId>org.springframework</groupId>

			<artifactId>spring-beans</artifactId>

			<version>${spring_version}</version>

		</dependency>

		<dependency>

			<groupId>org.springframework</groupId>

			<artifactId>spring-expression</artifactId>

			<version>${spring_version}</version>

		</dependency>

		<dependency>

			<groupId>javax.servlet.jsp.jstl</groupId>

			<artifactId>jstl-api</artifactId>

			<version>1.2</version>

		</dependency>

		<dependency>

			<groupId>jstl</groupId>

			<artifactId>jstl</artifactId>

			<version>1.2</version>

		</dependency>

		<dependency>

			<groupId>junit</groupId>

			<artifactId>junit</artifactId>

			<version>3.8.1</version>

			<scope>test</scope>

		</dependency>

	</dependencies>

	<properties>

		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

		<spring_version>4.1.2.RELEASE</spring_version>

	</properties>

	<build>

		<finalName>springmvc</finalName>

		<plugins>

			<plugin>

				<groupId>org.apache.maven.plugins</groupId>

				<artifactId>maven-compiler-plugin</artifactId>

				<version>2.3.2</version>

				<configuration>

					<source>1.7</source>

					<target>1.7</target>

				</configuration>

			</plugin>

		</plugins>

	</build>

</project>

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"

	version="3.0" >

	<!-- The front controller of this Spring Web application, responsible for handling all application requests -->

	<servlet>

		<servlet-name>springDispatcherServlet</servlet-name>

	<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

        <!-- 载入spirng配置文件 -->

		<init-param>

			<param-name>contextConfigLocation</param-name>

			<param-value>classpath:spring-mvc.xml</param-value>

		</init-param>

        <!-- 启动就载入 -->

		<load-on-startup>1</load-on-startup>

	</servlet>

	<!-- 拦截全部请求 -->

	<servlet-mapping>

		<servlet-name>springDispatcherServlet</servlet-name>

		<url-pattern>/</url-pattern>

	</servlet-mapping>

</web-app>
	

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HelloWorld.java

package com.ibigsea.springmvc.helloworld;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

@Controller

public class HelloWorld {

	/**

	 * 配置@RequestMapping 拦截 localhost:8080/springmvc/hello 请求

	 * @return

	 */

	@RequestMapping("/hello")

	public String helloWorld(){

		System.out.println("hello world");

		return "helloworld";

	}

}

<?

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"

	xmlns:mvc="http://www.springframework.org/schema/mvc"

	xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd

		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-4.1.xsd">

    <!-- 配置自己主动扫描包  扫描com.ibigsea.springmvc 包下的类 -->

	<context:component-scan base-package="com.ibigsea.springmvc"/>

<!-- 配置视图解析器 如返回helloworld

                         为 [/WEB-INF/pages/helloworld.jsp] -->

	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">

     <!-- 前缀 -->

		<property name="prefix" value="/WEB-INF/pages/"/>

         <!-- 后缀 -->

		<property name="suffix" value=".jsp"/>

	</bean>

</beans>

重定向和转发

普通情况下，控制器方法返回字符串类型的值会被当成逻辑视图名处理

• 假设返回的字符串中带 forward: 或 redirect: 前缀时，SpringMVC 会对他们进行特殊处理：将 forward: 和redirect: 当成指示符，其后的字符串作为 URL 来处理

– redirect:helloworld.jsp：会完毕一个到 helloworld.jsp 的重定向的操作

– forward:helloworld.jsp：会完毕一个到 helloworld.jsp 的转发操作

在 UrlBasedViewResolver 类里面的 createView 方法 解析