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springmvc之HelloWorld
首先来看看springmvcproject的项目结构，採用maven构建。
POM配置：
<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/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.ztz.springmvc</groupId> <artifactId>springmvc</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>war</packaging> <dependencies> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>4.1.7.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>4.1.7.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>4.1.7.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>4.1.7.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>4.1.7.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>4.1.7.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>4.1.7.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>4.1.7.RELEASE</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.1-b08</version> </dependency> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.16</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>1.5.2</version> </dependency> <dependency> <groupId>jstl</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> <dependency> <groupId>taglibs</groupId> <artifactId>standard</artifactId> <version>1.1.2</version> </dependency> </dependencies> <build> <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>
然后看下web工成的web.xml配置
<display-name>springmvc</display-name> <!-- 载入spring配置文件 --> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext.xml</param-value> </context-param> <!-- 字符集过滤器 --> <filter> <filter-name>encodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> </filter> <filter-mapping> <filter-name>encodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <!-- spring监听器 --> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <!-- 防止spring内存溢出监听器 --> <listener> <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class> </listener> <!-- spring mvc servlet --> <servlet> <servlet-name>springMvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:spring-mvc.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springMvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping>
web.xml里面配置我就不多说了。凝视写的非常清楚了。只是说下Spring mvc拦截的URL，事实上常见的写法是*.do、/*、/app，可是这些模式都不是非常好。
<servlet-mapping> <servlet-name>springMvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping>通过将DispatcherServlet映射到 / ，声明了它会作为默认的servlet而且会处理全部的请求，包含对静态资源的请求。
可是一般来说。我们无需去拦截静态资源（比方：css、js、图片）。Spring提供了一个非常方便的配置，使得我们不必过于操心细节。
<!-- 处理对静态资源的请求 --> <mvc:resources location="/static/" mapping="/static/**" />
接下来配置控制器跟视图解析器(spring-mvc.xml)
<!--默认的mvc注解映射的支持 -->
<mvc:annotation-driven/>
<!-- 处理对静态资源的请求 -->
<mvc:resources location="/static/" mapping="/static/**" />
<!-- 扫描注解 -->
<context:component-scan base-package="com.ztz.springmvc.controller"/>
<!-- 视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="http://www.mamicode.com/org.springframework.web.servlet.view.JstlView"/>
<!-- 前缀 -->
<property name="prefix" value="http://www.mamicode.com/WEB-INF/jsp/"/>
<!-- 后缀 -->
<property name="suffix" value="http://www.mamicode.com/.jsp"/>
</bean>Controller层：
package com.ztz.springmvc.controller;
import javax.servlet.http.HttpServletRequest;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
@RequestMapping("/user")
public class UsersController {
@RequestMapping(value="http://www.mamicode.com/findAll")
private String findAll(HttpServletRequest request){
request.setAttribute("hello", "spring mvc Helloworld");
return "index";
}
}
JSP页面：
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jstl/core_rt" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
request.setAttribute("basePath", basePath);
%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>springmvc</title>
</head>
<body>
${hello}
<br/>
<img alt="logo" src="http://www.mamicode.com/${basePath}static/images/java_logo.jpg">
</body>
</html>启动服务，浏览器訪问：http://127.0.0.1:8080/springmvc/user/findAll
springmvc之HelloWorld
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