Maven+Mybatis+Spring+eclipse环境配置

1.Download JDK :http://www.oracle.com/technetwork/java/javase/downloads/index.html
环境变量
JAVA_HOME:D:\Program Files\Java\jdk1.8.0_91
PATH:%JAVA_HOME%\bin;%JAVA_HOME%\jre\bin;
2.Download maven:http://maven.apache.org/download.cgi
环境变量
MAVEN_HOME:D:\20160706\apache-maven-3.3.9
PATH:%MAVEN_HOME%\bin;
cmd -> mvn -version
Maven数据仓库配置:
D:\20160706\apache-maven-3.3.9\conf -> settings.xml
接触注释localRepository标签，配置路径:D:\20160706\maven-repository\maven-jar
cp settings.xml to D:\20160706\maven-repository\

3.Download Eclipse IDE:http://www.eclipse.org/downloads/eclipse-packages/
Download Tomcat:http://tomcat.apache.org/download-80.cgi#8.0.36
Window -> Preferences -> Server -> Runtime Environments -> Add -> Apache Tomcat v8.0 -> Tomcat installation directory:D:\20160706\apache-tomcat-8.0.36, JRE:jre1.8.0_91
Window -> Preferences -> Maven -> Installations -> Add -> Directory:D:\20160706\apache-maven-3.3.9
Window -> Preferences -> Maven -> User Settings:D:\20160706\maven-repository\settings.xml
6.SVN插件安装
Help -> Eclipse Marketplace -> Find:subclipse -> Install
Window -> Show View -> Other -> SVN资源库: 右键新建资源库位置，输入服务器地址
7.Java代码提示
Window -> Preferences -> Java -> Editor -> Content Assist: Auto activation triggers for Java:.abcdefghijklmnopqrstuvwxyz, delay(ms):200
8.新建maven项目
New -> Maven Project -> maven-archetype-webapp -> Artifact Id:项目名称，Group Id:com.trav, Package:空 -> Finish
右键项目trav -> Properties -> Resource -> Text file encoding:UTF-8
  -> Java Build Path:Libraries -> JRE Edit:Workspace default JRE(1.8.0_91)
index.jsp报错，我们需要引入java ee的jar包即可。在pom.xml中引入：
<!– 导入java ee jar 包 –>  
        <dependency>  
            <groupId>javax</groupId>  
            <artifactId>javaee-api</artifactId>  
            <version>7.0</version>  
        </dependency> 

web项目配置jstl等: trav -> Properties -> Project Facets:

//Dynamic Web Module 3.1 (右键项目-Maven-Update Project,再改为3.1就可以了 or 打开项目下的 .setting\org.eclipse.wst.common.project.facet.core.xml,手动修改<installed facet=”jst.web” version=”2.5”/> 重启tomcatX就可以正常使用)
->Java 1.8
9.SSM整合
9.1 Maven引入需要的JAR包，pom.xml:
<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.trav</groupId>
<artifactId>trav</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>trav Maven Webapp</name>
<url>http://maven.apache.org</url&gt;
<properties>
<!– spring版本号 –>
<spring.version>4.0.2.RELEASE</spring.version>
<!– mybatis版本号 –>
<mybatis.version>3.2.6</mybatis.version>
<!– log4j日志文件管理包版本 –>
<slf4j.version>1.7.7</slf4j.version>
<log4j.version>1.2.17</log4j.version>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<!– 表示开发的时候引入，发布的时候不会加载此包 –>
<scope>test</scope>
</dependency>
<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-oxm</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</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-aop</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>${mybatis.version}</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.2.2</version>
</dependency>
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<version>7.0</version>
</dependency>
<!– 导入Mysql数据库链接jar包 –>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.30</version>
</dependency>
<!– 导入dbcp的jar包，用来在applicationContext.xml中配置数据库 –>
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.2.2</version>
</dependency>
<!– JSTL标签类 –>
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!– 日志文件管理包 –>
<!– log start –>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
</dependency>
<!– 格式化对象，方便输出日志 –>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.1.41</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${slf4j.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>${slf4j.version}</version>
</dependency>
<!– log end –>
<!– 引入JSON –>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.13</version>
</dependency>
<!– 上传组件包 –>
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.1</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.4</version>
</dependency>
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<version>1.9</version>
</dependency>
</dependencies>
<build>
<finalName>trav</finalName>
</build>
</project>

9.2 Spring与MyBatis的整合
9.2.1 建立JDBC属性文件 src/main/resources/db.properties（文件编码修改为utf-8）
driver=com.mysql.jdbc.Driver
url=jdbc:mysql://127.0.0.1:3306/trav
username=root
password=928606

#定义初始连接数
initialSize=0
#定义最大连接数
maxActive=20
#定义最大空闲
maxIdle=20
#定义最小空闲
minIdle=1
#定义最长等待时间
maxWait=60000

9.2.2 建立spring-mybatis.xml配置文件 src/main/resources/
<?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:p=”http://www.springframework.org/schema/p”
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-3.1.xsd    
                        http://www.springframework.org/schema/context    
                        http://www.springframework.org/schema/context/spring-context-3.1.xsd    
                        http://www.springframework.org/schema/mvc    
                        http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd”>
<!– 自动扫描 –>
<context:component-scan base-package=”com.cn.hnust” />
<!– 引入配置文件 –>
<bean id=”propertyConfigurer”
class=”org.springframework.beans.factory.config.PropertyPlaceholderConfigurer”>
<property name=”location” value=”classpath:db.properties” />
</bean>
<bean id=”dataSource” class=”org.apache.commons.dbcp.BasicDataSource”
destroy-method=”close”>
<property name=”driverClassName” value=”${driver}” />
<property name=”url” value=”${url}” />
<property name=”username” value=”${username}” />
<property name=”password” value=”${password}” />
<!– 初始化连接大小 –>
<property name=”initialSize” value=”${initialSize}”></property>
<!– 连接池最大数量 –>
<property name=”maxActive” value=”${maxActive}”></property>
<!– 连接池最大空闲 –>
<property name=”maxIdle” value=”${maxIdle}”></property>
<!– 连接池最小空闲 –>
<property name=”minIdle” value=”${minIdle}”></property>
<!– 获取连接最大等待时间 –>
<property name=”maxWait” value=”${maxWait}”></property>
</bean>
<!– spring和MyBatis完美整合，不需要mybatis的配置映射文件 –>
<bean id=”sqlSessionFactory” class=”org.mybatis.spring.SqlSessionFactoryBean”>
<property name=”dataSource” ref=”dataSource” />
<!– 自动扫描mapping.xml文件 –>
<property name=”mapperLocations” value=”classpath:com/cn/hnust/mapping/*.xml”></property>
</bean>
<!– DAO接口所在包名，Spring会自动查找其下的类 –>
<bean class=”org.mybatis.spring.mapper.MapperScannerConfigurer”>
<property name=”basePackage” value=”com.cn.hnust.dao” />
<property name=”sqlSessionFactoryBeanName” value=”sqlSessionFactory”></property>
</bean>
<!– (事务管理)transaction manager, use JtaTransactionManager for global tx –>
<bean id=”transactionManager”
class=”org.springframework.jdbc.datasource.DataSourceTransactionManager”>
<property name=”dataSource” ref=”dataSource” />
</bean>
</beans>

9.2.3 Log4j的配置 src/main/resources/log4j.properties

log4j.rootLogger=INFO, console, file
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.Target=System.out
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=[%c] - %m%n
log4j.appender.file=org.apache.log4j.DailyRollingFileAppender
log4j.appender.file.DatePattern=’.’yyyy-MM-dd
log4j.appender.file.File=logs/webapp.log
log4j.appender.file.Append=true
log4j.appender.file.Threshold=ALL
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=[%p][%d{yyyy-MM-dd HH\:mm\:ss}][%c] - %m%n

使用详解:http://blog.csdn.NET/xuliuzhu/article/details/51925800

###

log4j.rootLogger=INFO,Console,File

#定义日志输出目的地为控制台
log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.Target=System.out
#可以灵活地指定日志输出格式，下面一行是指定具体的格式
log4j.appender.Console.layout = org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=[%c] - %m%n
#文件大小到达指定尺寸的时候产生一个新的文件
log4j.appender.File = org.apache.log4j.RollingFileAppender
#指定输出目录
log4j.appender.File.File = logs/ssm.log
#定义文件最大大小
log4j.appender.File.MaxFileSize = 10MB
# 输出所以日志，如果换成DEBUG表示输出DEBUG以上级别日志
log4j.appender.File.Threshold = ALL
log4j.appender.File.layout = org.apache.log4j.PatternLayout
log4j.appender.File.layout.ConversionPattern =[%p] [%d{yyyy-MM-dd HH\:mm\:ss}][%c]%m%n

9.2.4 JUnit测试
数据库中建立一个测试表，SQL语句为：
DROP TABLE IF EXISTS `user_t`;  
CREATE TABLE `user_t` (  
  `id` int(11) NOT NULL AUTO_INCREMENT,  
  `user_name` varchar(40) NOT NULL,  
  `password` varchar(255) NOT NULL,  
  `age` int(4) NOT NULL,  
  PRIMARY KEY (`id`)  
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;  
/*Data for the table `user_t` */  
insert  into `user_t`(`id`,`user_name`,`password`,`age`) values (1,’测试’,’sfasgfaf’,24);  

9.2.5 使用MyBatis Generator自动创建代码
mkdir D:\20160706\mybatis-generator-core-1.3.2\lib
Download mybatis-generator-core: http://grepcode.com/snapshot/repo1.maven.org/maven2/org.mybatis.generator/mybatis-generator-core/1.3.2
cp mysql-connector-java-5.1.30.jar and mybatis-3.2.7.jar to lib
new src folder
new generator-config.xml:
<?xml version=”1.0” encoding=”UTF-8”?>    
<!DOCTYPE generatorConfiguration    
  PUBLIC “-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN”    
  “http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd”>
<generatorConfiguration>
<!– 数据库驱动 –>
<classPathEntry location=”mysql-connector-java-5.1.30.jar” />
<context id=”DB2Tables” targetRuntime=”MyBatis3”>
<commentGenerator>
<property name=”suppressDate” value=”true” />
<!– 是否去除自动生成的注释 true：是 ： false:否 –>
<property name=”suppressAllComments” value=”true” />
</commentGenerator>
<!–数据库链接URL，用户名、密码 –>
<jdbcConnection driverClass=”com.mysql.jdbc.Driver”
connectionURL=”jdbc:mysql://127.0.0.1:3306/trav” userId=”root”
password=”928606”>
</jdbcConnection>
<javaTypeResolver>
<property name=”forceBigDecimals” value=”false” />
</javaTypeResolver>
<!– 生成模型的包名和位置 –>
<javaModelGenerator targetPackage=”com.cn.hnust.pojo”
targetProject=”src”>
<property name=”enableSubPackages” value=”true” />
<property name=”trimStrings” value=”true” />
</javaModelGenerator>
<!– 生成映射文件的包名和位置 –>
<sqlMapGenerator targetPackage=”com.cn.hnust.mapping”
targetProject=”src”>
<property name=”enableSubPackages” value=”true” />
</sqlMapGenerator>
<!– 生成DAO的包名和位置 –>
<javaClientGenerator type=”XMLMAPPER”
targetPackage=”com.cn.hnust.dao” targetProject=”src”>
<property name=”enableSubPackages” value=”true” />
</javaClientGenerator>
<!– 要生成的表 tableName是数据库中的表名或视图名 domainObjectName是实体类名 –>
<table tableName=”user_t” domainObjectName=”User”
enableCountByExample=”false” enableUpdateByExample=”false”
enableDeleteByExample=”false” enableSelectByExample=”false”
selectByExampleQueryId=”false”></table>
</context>
</generatorConfiguration>

cmd D:
cd D:\20160706\mybatis-generator-core-1.3.2\lib
java -jar mybatis-generator-core-1.3.2.jar -configfile generator-config.xml -overwrite
9.2.6 建立测试类
测试类在src/test/java中建立，下面测试类中注释掉的部分是不使用Spring时，一般情况下的一种测试方法；如果使用了Spring那么就可以使用注解的方式来引入配置文件和类，然后再将service接口对象注入，就可以进行测试了。
       如果测试成功，表示Spring和Mybatis已经整合成功了。输出信息使用的是Log4j打印到控制台。
package com.cn.hnust.service;
import javax.annotation.Resource;
import org.apache.log4j.Logger;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import com.alibaba.fastjson.JSON;
import com.cn.hnust.pojo.User;
import com.cn.hnust.service.IUserService;
//表示继承了SpringJUnit4ClassRunner类
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {“classpath:spring-mybatis.xml”})
public class IUserServiceTest {
private static Logger logger = Logger.getLogger(IUserServiceTest.class);
//private ApplicationContext ac = null;
@Resource
private IUserService userService = null;
//@Before
//public void before() {
//ac = new ClassPathXmlApplicationContext(“applicationContext.xml”);//不使用Spring测试 
//userService = (IUserService) ac.getBean(“userService”);
//}
@Test
public void testGetUserById() {
User user = userService.getUserById(1);
logger.info(“user: “+JSON.toJSONString(user));
}
}
9.3 整合SpringMVC
上面已经完成了2大框架的整合，SpringMVC的配置文件单独放，然后在web.xml中配置整合。
9.3.1 配置spring-mvc.xml

主要是自动扫描控制器，视图模式，注解的启动

<?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:p=”http://www.springframework.org/schema/p”
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-3.1.xsd    
                        http://www.springframework.org/schema/context    
                        http://www.springframework.org/schema/context/spring-context-3.1.xsd    
                        http://www.springframework.org/schema/mvc    
                        http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd”>
                        
<!– 自动扫描该包，使SpringMVC认为包下用了@controller注解的类是控制器 –>
<context:component-scan base-package=”com.cn.hnust.controller” />

<!–避免IE执行AJAX时，返回JSON出现下载文件 –>
<bean id=”mappingJacksonHttpMessageConverter”
class=”org.springframework.http.converter.json.MappingJacksonHttpMessageConverter”>
<property name=”supportedMediaTypes”>
<list>
<value>text/html;charset=UTF-8</value>
</list>
</property>
</bean>

<!– 启动SpringMVC的注解功能，完成请求和注解POJO的映射 –>
<bean
class=”org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter”>
<property name=”messageConverters”>
<list>
<ref bean=”mappingJacksonHttpMessageConverter” /> <!– JSON转换器 –>
</list>
</property>
</bean>

<!– 定义跳转的文件的前后缀 ，视图模式配置 –>
<bean
class=”org.springframework.web.servlet.view.InternalResourceViewResolver”>
<!– 这里的配置我的理解是自动给后面action的方法return的字符串加上前缀和后缀，变成一个 可用的url地址 –>
<property name=”prefix” value=”/WEB-INF/jsp/” />
<property name=”suffix” value=”.jsp” />
</bean>


<!– 配置文件上传，如果没有使用文件上传可以不用配置，当然如果不配，那么配置文件中也不必引入上传组件包 –>
<bean id=”multipartResolver”
class=”org.springframework.web.multipart.commons.CommonsMultipartResolver”>
<!– 默认编码 –>
<property name=”defaultEncoding” value=”utf-8” />
<!– 文件大小最大值 –>
<property name=”maxUploadSize” value=”10485760000” />
<!– 内存中的最大值 –>
<property name=”maxInMemorySize” value=”40960” />
</bean>


</beans>

9.3.2 配置web.xml文件
这里面对spring-mybatis.xml的引入以及配置的spring-mvc的Servlet就是为了完成SSM整合，之前2框架整合不需要在此处进行任何配置。
<?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”>
<display-name>Archetype Created Web Application</display-name>
<!– Spring和mybatis的配置文件 –>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-mybatis.xml</param-value>
</context-param>
<!– 编码过滤器 –>
<filter>
<filter-name>encodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<async-supported>true</async-supported>
<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>
<async-supported>true</async-supported>
</servlet>
<servlet-mapping>
<servlet-name>SpringMVC</servlet-name>
<!– 此处可以可以配置成*.do，对应struts的后缀习惯 –>
<url-pattern>/</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>/index.jsp</welcome-file>
</welcome-file-list>
</web-app>
9.3.3 测试
新建页面:webapp/WEB-INF/jsp/show-user.jsp
<%@ page language=”java” import=”java.util.*” pageEncoding=”utf-8”%>
<!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01 Transitional//EN”>
<html>
<head>
<title>测试</title>
</head>
<body>${user.userName}
</body>
</html>
UserController.java  控制器
package com.cn.hnust.controller;
import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import com.cn.hnust.service.IUserService;
@Controller
@RequestMapping(“/user”)
public class UserController {
@Resource
private IUserService userService;
@RequestMapping(“/showUser”)
public String toIndex(HttpServletRequest request, Model model) {
int userId = Integer.parseInt(request.getParameter(“id”));
model.addAttribute(“user”, userService.getUserById(userId));
return “show-user”;
}
}
部署项目，输入地址：localhost:8080/trav/user/showUser?id=1
Eclipse报错：java.lang.ClassNotFoundException: ContextLoaderListener
错误原因：
进入到tomcat的部署路径.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\下检查了一下，发现工程部署后在WEB-INF文件夹下没有生成lib目录，正常情况下，会生成lib目录并把工程的所有依赖jar包都部署到该目录下。
解决方案：
1.右键点击项目–选择Properties
选择Deployment Assembly,在右边点击Add按钮，在弹出的窗口中选择Java Build Path Entries。
点击Next，选择Maven Dependencies
点击Finish，然后可以看到已经把Maven Dependencies添加到Web应用结构中了
重新部署工程，不再报错了。然后我们再到.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\目录下，发现工程WEB-INF目录下自动生成了lib目录，并且所有的依赖jar包也都已经部署进来。

转载至 ：http://blog.csdn.net/xuliuzhu/article/details/51857546