Druid集连接池，监控于一体整好复合当前项目的需要，项目是ssh结构，之前是用C3p0的，现在换一个连接池也是很简单的，首先spring配置DataSource，配置如下：
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
<!-- 基本属性 url、user、password -->
<property name="url" value="${jdbc_url}" />
<property name="username" value="${jdbc_user}" />
<property name="password" value="${jdbc_password}" />
<!-- 配置初始化大小、最小、最大 -->
<property name="initialSize" value="1" />
<property name="minIdle" value="1" />
<property name="maxActive" value="20" />
<!-- 配置获取连接等待超时的时间 -->
<property name="maxWait" value="60000" />
<!-- 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" />
<!-- 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" />
<property name="validationQuery" value="SELECT 'x'" />
<property name="testWhileIdle" value="true" />
<property name="testOnBorrow" value="false" />
<property name="testOnReturn" value="false" />
<!-- 打开PSCache，并且指定每个连接上PSCache的大小 -->
<property name="poolPreparedStatements" value="true" />
<property name="maxPoolPreparedStatementPerConnectionSize" value="20" />
<!-- 配置监控统计拦截的filters，去掉后监控界面sql无法统计 -->
<property name="filters" value="stat" />
</bean>目前这样的配置已经能够使用连接池，注意不要忘记了jar文件，下载地址：http://code.alibabatech.com/mvn/releases/com/alibaba/druid/
然后是监控的配置：
web.xml
<filter>
<filter-name>DruidWebStatFilter</filter-name>
<filter-class>com.alibaba.druid.support.http.WebStatFilter</filter-class>
<init-param>
<param-name>exclusions</param-name>
<param-value>*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>DruidWebStatFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>filter可以监控webURl 访问
<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>该配置可以访问监控界面
配置好后访问
http://ip：port/projectName/druid/index.html具体和项目集成实例：
一、相关JAR包
由于是基于Maven的项目，找起JAR包自然就方便了许多，我们只需要知道JAR的名字或者其中关键字就可以很轻松的把JAR包以及依赖JAR下载下来，需要多少下多少。
这里给出pom的配置文件。
pom.xml
1 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
2 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
3 <modelVersion>4.0.0</modelVersion>
4 <groupId>SpringMybatis</groupId>
5 <artifactId>SpringMybatis</artifactId>
6 <packaging>war</packaging>
7 <version>0.0.1-SNAPSHOT</version>
8 <name>SpringMybatis Maven Webapp</name>
9 <url>http://maven.apache.org</url>
10 <dependencies>
11 <dependency>
12 <groupId>org.springframework</groupId>
13 <artifactId>spring-core</artifactId>
14 <version>3.2.10.RELEASE</version>
15 </dependency>
16 <dependency>
17 <groupId>org.springframework</groupId>
18 <artifactId>spring-web</artifactId>
19 <version>3.2.10.RELEASE</version>
20 </dependency>
21 <dependency>
22 <groupId>org.springframework</groupId>
23 <artifactId>spring-webmvc</artifactId>
24 <version>3.2.10.RELEASE</version>
25 </dependency>
26 <dependency>
27 <groupId>org.mybatis</groupId>
28 <artifactId>mybatis</artifactId>
29 <version>3.2.8</version>
30 </dependency>
31 <dependency>
32 <groupId>org.mybatis</groupId>
33 <artifactId>mybatis-spring</artifactId>
34 <version>1.1.1</version>
35 </dependency>
36 <dependency>
37 <groupId>mysql</groupId>
38 <artifactId>mysql-connector-java</artifactId>
39 <version>5.0.2</version>
40 </dependency>
41 <dependency>
42 <groupId>junit</groupId>
43 <artifactId>junit</artifactId>
44 <version>4.12</version>
45 <scope>test</scope>
46 </dependency>
47 <dependency>
48 <groupId>com.alibaba</groupId>
49 <artifactId>druid</artifactId>
50 <version>1.0.11</version>
51 </dependency>
52 <dependency>
53 <groupId>log4j</groupId>
54 <artifactId>log4j</artifactId>
55 <version>1.2.17</version>
56 </dependency>
57 </dependencies>
58 <build>
59 <finalName>SpringMybatis</finalName>
60 </build>
61 </project>由于Maven会把JAR包所依赖的JAR包也一起下载下来，这里我们就不需要逐个去写Spring的相关JAR包。
这里用到了阿里巴巴温少的开源项目Druid的数据源，所以额外的多引入了一个Druid的JAR包。
关于JAR的扩展，如果有需要别的可以到：http://search.maven.org/ 去查找，然后复制到这个配置文件即可，Maven会帮我们自动下载添加。
二、相关配置
spring.xml
1 <?xml version="1.0" encoding="UTF-8"?>
2 <beans xmlns="http://www.springframework.org/schema/beans"
3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
4 xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
5 xsi:schemaLocation="http://www.springframework.org/schema/beans
6 http://www.springframework.org/schema/beans/spring-beans.xsd
7 http://www.springframework.org/schema/context
8 http://www.springframework.org/schema/context/spring-context.xsd
9 http://www.springframework.org/schema/aop
10 http://www.springframework.org/schema/aop/spring-aop.xsd
11 http://www.springframework.org/schema/tx
12 http://www.springframework.org/schema/tx/spring-tx.xsd">
13
14 <!-- 自动注入 -->
15 <context:component-scan base-package="lcw/service"/>
16
17
18 </beans>
mybatis-spring.xml
1 <?xml version="1.0" encoding="UTF-8"?>
2 <beans xmlns="http://www.springframework.org/schema/beans"
3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
4 xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
5 xsi:schemaLocation="http://www.springframework.org/schema/beans
6 http://www.springframework.org/schema/beans/spring-beans.xsd
7 http://www.springframework.org/schema/context
8 http://www.springframework.org/schema/context/spring-context.xsd
9 http://www.springframework.org/schema/aop
10 http://www.springframework.org/schema/aop/spring-aop.xsd
11 http://www.springframework.org/schema/tx
12 http://www.springframework.org/schema/tx/spring-tx.xsd">
13
14 <!-- 配置数据源 -->
15 <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
16 <property name="url" value="jdbc:mysql:///test"></property>
17 <property name="username" value="root"></property>
18 <property name="password" value="root"></property>
19 </bean>
20
21
22 <!-- Mybatis文件 -->
23 <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
24 <property name="dataSource" ref="dataSource"></property>
25 <property name="mapperLocations" value="classpath:lcw/mapping/*.xml"></property>
26 </bean>
27
28 <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
29 <property name="basePackage" value="lcw.dao"></property>
30 <property name="sqlSessionFactoryBeanName" value ="sqlSessionFactory"></property>
31 </bean>
32
33
34 <!-- 事务管理器 -->
35 <bean id="transactionManager"
36 class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
37 <property name="dataSource" ref="dataSource"></property>
38 </bean>
39
40 <tx:annotation-driven transaction-manager="transactionManager" />
41
42 </beans>
springmvc.xml
1 <?xml version="1.0" encoding="UTF-8"?>
2 <beans xmlns="http://www.springframework.org/schema/beans"
3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
4 xmlns:context="http://www.springframework.org/schema/context"
5 xmlns:mvc="http://www.springframework.org/schema/mvc"
6 xsi:schemaLocation="
7 http://www.springframework.org/schema/beans
8 http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
9 http://www.springframework.org/schema/context
10 http://www.springframework.org/schema/context/spring-context-3.0.xsd
11 http://www.springframework.org/schema/mvc
12 http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
13 ">
14
15 <!-- 启用spring mvc 注解 -->
16 <context:annotation-config />
17
18 <!-- 设置使用注解的类所在的jar包 -->
19 <context:component-scan base-package="lcw.controller"></context:component-scan>
20
21 <!-- 完成请求和注解POJO的映射 -->
22 <bean
23 class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />
24
25 <!-- 对转向页面的路径解析。prefix：前缀， suffix：后缀 -->
26 <bean
27 class="org.springframework.web.servlet.view.InternalResourceViewResolver"
28 p:prefix="/" p:suffix=".jsp" />
29
30
31 </beans>
log4j.properties
1 #
2 # Copyright 2009-2012 the original author or authors.
3 #
4 # Licensed under the Apache License, Version 2.0 (the "License");
5 # you may not use this file except in compliance with the License.
6 # You may obtain a copy of the License at
7 #
8 # http://www.apache.org/licenses/LICENSE-2.0
9 #
10 # Unless required by applicable law or agreed to in writing, software
11 # distributed under the License is distributed on an "AS IS" BASIS,
12 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 # See the License for the specific language governing permissions and
14 # limitations under the License.
15 #
16
17 ### Global logging configuration
18 log4j.rootLogger=DEBUG, stdout
19
20 ### Uncomment for MyBatis logging
21 log4j.logger.org.apache.ibatis=DEBUG
22
23 ### Console output...
24 log4j.appender.stdout=org.apache.log4j.ConsoleAppender
25 log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
26 log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n
来源：oschina
链接：https://my.oschina.net/u/2429470/blog/618527