主讲spring mvc 在web.xml中的配置

下面文章来自网上资源摘抄：
http://blog.csdn.net/xcmonline/article/details/46943441
目前主流的Web MVC框架，除了Struts这个主力 外，还有Spring MVC，主要是由于Spring MVC配置比较简单，使用起来也十分明了，非常灵活，与Spring 集成较好，对RESTful API的支持也比struts要好。
MyBatis是ibatis的升级版，作为hibernate的老对手，它 是一个可以自定义SQL、存储过程和高级映射的持久层框架。

与hibernate的主要区别就是mybatis是半自动化的，而hibernate是全自动的，所以当应用需求越来越复杂的时候，自动化的sql显得比较笨拙。

由于前段时间接了个项目要用springmvc做，所以我抱着练手的态度，又玩起了整合框架的游戏。经常搭框架的人应该都清楚，框架搭建的核心就是配置文件。所以我主要贴下几个配置文件的代码。还是那句话，我都是写好配置文件之后，运行报错再加jar。这里列一下我用的jar包（应该是最少的）：



备注：上图有一些额外的jar，比如我用的数据库连接池是阿里巴巴的druid、日志框架式logback，所以引入了相关jar。关于这两个框架的使用和配置都是非常简单的，所以这里就不细说。

1.整合SpringMVC

springMybatis-servlet.xml：

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<?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">

<!-- 启用spring mvc 注解-->

<mvc:annotation-driven>

</mvc:annotation-driven>

<!-- 自动扫描的包名 ，使Spring支持自动检测组件，如注解的Controller-->

<context:component-scan base-package="com.alibaba.controller" />

<context:component-scan base-package="com.alibaba.service"/>

<!-- 视图解析器:定义跳转的文件的前后缀 -->

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

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

<property name="suffix" value=".jsp" /> <!--可为空,方便实现自已的依据扩展名来选择视图解释类的逻辑 -->

</bean>

<!--配置拦截器, 多个拦截器,顺序执行 -->

<mvc:interceptors>

<mvc:interceptor>

<!-- 匹配的是url路径 -->

<mvc:mapping path="/" />

<mvc:mapping path="/user/**" />

<mvc:mapping path="/test/**" />

<bean class="com.alibaba.interceptor.CommonInterceptor"></bean>

</mvc:interceptor>

<!-- 当设置多个拦截器时，先按顺序调用preHandle方法，然后逆序调用每个拦截器的postHandle和afterCompletion方法 -->

</mvc:interceptors>

</beans>

2.整合Mybatis
spring-dao.xml:

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<?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:mybatis="http://mybatis.org/schema/mybatis-spring"

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

xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://mybatis.org/schema/mybatis-spring http://mybatis.org/schema/mybatis-spring.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

<!-- 该包下的类支持注解，表示会被当作{@code mybatis mapper}处理 配置了之后表示可以自动引入mapper类-->

<mybatis:scan base-package="com.alibaba.dao"/>

<!--引入属性文件 -->

<context:property-placeholder location="classpath:configuration.properties"/>

<!--数据库连接-->

<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">

<property name="url" value="${jdbc.url}" />

<property name="username" value="${jdbc.username}"/>

<property name="password" value="${jdbc.password}"/>

<!-- 配置初始化大小、最小、最大 -->

<property name="initialSize"><value>1</value></property>

<property name="maxActive"><value>5</value></property>

<property name="minIdle"><value>1</value></property>

<!-- 配置获取连接等待超时的时间 -->

<property name="maxWait"><value>60000</value></property>

<!-- 配置监控统计拦截的filters -->

<property name="filters"><value>stat</value></property>

<!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 -->

<property name="timeBetweenEvictionRunsMillis"><value>60000</value></property>

<!-- 配置一个连接在池中最小生存的时间，单位是毫秒 -->

<property name="minEvictableIdleTimeMillis"><value>300000</value></property>

<!--

<property name="validationQuery"><value>SELECT 'x'</value></property>

<property name="testWhileIdle"><value>true</value></property>

<property name="testOnBorrow"><value>false</value></property>

<property name="testOnReturn"><value>false</value></property>

<property name="poolPreparedStatements"><value>true</value></property>

<property name="maxOpenPreparedStatements"><value>20</value></property>

-->

</bean>

<!-- mybatis配置 -->

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">

<property name="dataSource" ref="dataSource" />

</bean>

</beans>

3.web.xml整合SpringMVC和Mybatis

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<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">

<!--　该servlet为tomcat,jetty等容器提供,将静态资源映射从/改为/static/目录，如原来访问　http://localhost/foo.css　,现在http://localhost/static/foo.css　-->

<!-- 不拦截静态文件 -->

<servlet-mapping>

<servlet-name>default</servlet-name>

<url-pattern>/js/*</url-pattern>

<url-pattern>/css/*</url-pattern>

<url-pattern>/images/*</url-pattern>

<url-pattern>/fonts/*</url-pattern>

</servlet-mapping>

<!-- 配置字符集 -->

<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>

<init-param>

<param-name>forceEncoding</param-name>

<param-value>true</param-value>

</init-param>

</filter>

<filter-mapping>

<filter-name>encodingFilter</filter-name>

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

</filter-mapping>

<!-- 初始化 DispatcherServlet时，该框架在 web应用程序WEB-INF目录中寻找一个名为[servlet-名称]-servlet.xml的文件，

并在那里定义相关的Beans，重写在全局中定义的任何Beans -->

<servlet>

<servlet-name>springMybatis</servlet-name>

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

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

</servlet>

<servlet-mapping>

<servlet-name>springMybatis</servlet-name>

<!-- 所有的的请求，都会被DispatcherServlet处理 -->

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

</servlet-mapping>

<context-param>

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

<param-value>/WEB-INF/config/spring-*.xml</param-value>

</context-param>

<listener>

<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>

</listener>

<!-- druid web 监控 -->

<servlet>

<servlet-name>DruidStatView</servlet-name>

<servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>DruidStatView</servlet-name>

<url-pattern>/druid/*</url-pattern>

</servlet-mapping>

<error-page>

<error-code>404</error-code>

<location>/error/404.jsp</location>

</error-page>

<error-page>

<error-code>500</error-code>

<location>/error/500.jsp</location>

</error-page>

</web-app>

4.logback.xml日志配置

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<?xml version="1.0" encoding="UTF-8"?>

<configuration>

<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">

<encoder>

<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>

</encoder>

</appender>

<logger name="test.LogbackTest" level="TRACE"/>

<logger name="com.alibaba.controller.TestController" level="TRACE"/>

<logger name="org.springframework.web.servlet.DispatcherServlet" level="DEBUG" />

<logger name="druid.sql" level="INFO" /><!-- 如果spring-config里面没有配置slf4j,就不会显示sql日志，logback只是slf4j的一个实现 -->

<root level="debug">

<appender-ref ref="STDOUT" />

</root>

</configuration>

5.configuration.properties配置

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jdbc.url=jdbc\:<a href="http://lib.csdn.net/base/14" class="replace_word" title="undefined" target="_blank" style="color: rgb(223, 52, 52); font-weight: bold;">mysql</a>\://localhost\:3306/druid?useUnicode\=true&characterEncoding\=UTF-8&zeroDateTimeBehavior\=convertToNull

jdbc.username=root

jdbc.password=123456

6.测试搭建是否成功，后台代码

首先是登录，用了加密，可以去掉

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package com.alibaba.controller;

import javax.annotation.Resource;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.codec.digest.DigestUtils;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.stereotype.Controller;

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

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

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

import com.alibaba.model.User;

import com.alibaba.service.UserService;

import com.alibaba.util.RequestUtil;

/**

* @author tfj

* 2014-7-26

*/

@Controller

public class SystemController {

private final Logger log = LoggerFactory.getLogger(SystemController.class);

@Resource

private UserService userService;

@RequestMapping(value = "/",method = RequestMethod.GET)

public String home() {

log.info("返回首页！");

return "index";

}

@RequestMapping(value = "/test/hello",method = RequestMethod.GET)

public String testHello() {

log.info("执行了testHello方法！");

return "testHello";

}

@RequestMapping(value = "/login",method = RequestMethod.POST)

public String testLogin(HttpServletRequest request,@RequestParam String username, @RequestParam String password) {

log.info("执行了testLogin方法！");

User user = userService.findUserByName(username);

if(user!=null){

if(user.getPassword().equals(DigestUtils.md5Hex(password))){

request.getSession().setAttribute("userId", user.getId());

request.getSession().setAttribute("user", username);

return "redirect:" + RequestUtil.retrieveSavedRequest();//跳转至访问页面

}else{

log.info("密码错误");

request.getSession().setAttribute("message", "用户名密码错误，请重新登录");

return "login";

}

}else{

log.info("用户名不存在");

request.getSession().setAttribute("message", "用户名不存在，请重新登录");

return "login";

}

}

}

关于service和model就不写了，写一下mybatis的mapper类映射

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<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.alibaba.dao.UserMapper">

<select id="findUserByName" resultType="com.alibaba.model.User">

select id, username , password from sysuser where username = #{username}

</select>

</mapper>