SpringMVC - HelloWorld
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1、创建一个Maven工程
2、导入依赖
<properties><junit.version>4.11</junit.version><spring.version>4.1.6.RELEASE</spring.version><jstl.version>1.2</jstl.version><servlet-api.version>2.5</servlet-api.version><jsp-api.version>2.0</jsp-api.version></properties><dependencies><!-- 单元测试 --><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>${junit.version}</version><scope>test</scope></dependency><!-- SpringMVC --><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>${spring.version}</version></dependency><!-- JSP相关 --><dependency><groupId>jstl</groupId><artifactId>jstl</artifactId><version>${jstl.version}</version></dependency><dependency><groupId>javax.servlet</groupId><artifactId>servlet-api</artifactId><version>${servlet-api.version}</version><scope>provided</scope></dependency><dependency><groupId>javax.servlet</groupId><artifactId>jsp-api</artifactId><version>${jsp-api.version}</version><scope>provided</scope></dependency></dependencies><build><finalName>springmvc2</finalName><plugins><!-- Java编译插件 --><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><version>3.2</version><configuration><source>1.7</source><target>1.7</target><encoding>UTF-8</encoding></configuration></plugin><!-- Tomcat插件 --><plugin><groupId>org.apache.tomcat.maven</groupId><artifactId>tomcat7-maven-plugin</artifactId><version>2.2</version><configuration><port>8888</port><path>/</path></configuration></plugin></plugins></build>
如果是手动导jar包的话,需要导入如下jar包:
3、添加必要的配置文件
log4j.properties(日志文件)
略...
web.xml (设置springmvc的入口,核心Servlet:DispatcherServlet)
<!-- 前端控制器 --><servlet><servlet-name>springmvc</servlet-name><!-- DispatcherServlet是一个Servlet,是对请求进行转发的核心Servlet, 它的主要功能就是对请求进行分发(也就是将请求转发给某个具体的Controller) ,可以简单的理解为 DispatcherServlet就是一个总控制处理器。 它还可以和Spring的IOC容器完全集成在一起,从而可以更好的实现Spring的功能。 --><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>springmvc</servlet-name><!-- 可用:*.do、*.xxx、/、/xxx/* 唯一不可用:/* --><url-pattern>*.action</url-pattern></servlet-mapping>
springmvc-servlet.xml(springmvc的配置文件,放在WEB-INF目录下,命名规则是{servlet-name}-servlet.xml,例如:给servlet配置的名称是abc,那么该springmvc配置文件的名称就是abc-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:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" 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.xsd"> <!-- 1、定义处理器映射器HandlerMapping --> <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping" /> <!-- 2、定义处理器适配器HandlerAdapter --> <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter" /> <!-- 3、定义处理业务逻辑的Handler --> <bean id="/hello.action" class="com.its.springmvc.web.controller.HellloWorldController" /> <!-- 4、定义视图解析器ViewResolver --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <!-- 前缀,存放页面的目录 --> <property name="prefix" value="/WEB-INF/views/" /> <!-- 后缀,视图的后缀名 --> <property name="suffix" value=".jsp" /> </bean></beans>
4、视图hello.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>HelloWorld SpringMVC</title></head><body> <h1>${msg }</h1></body></html>
5、Handler:处理业务逻辑,返回模型数据和视图名称
package com.its.springmvc.web.controller;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet.mvc.Controller;public class HellloWorldController implements Controller { @Override public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception { ModelAndView mv = new ModelAndView(); // 设置模型数据 mv.addObject("msg", "My first SpringMVC application !"); // 设置视图名称 mv.setViewName("hello"); return mv; }}
6、测试
7、程序执行流程图
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