Druid链接池简单入门配置

Druid集链接池，监控于一体整好复合当前项目的须要，项目是ssh结构，以前是用C3p0的，如今换一个链接池也是很简单的，首先spring配置DataSource，配置以下：

<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" />
 
    <!-- 配置获取链接等待超时的时间 -->
    <property name="maxWait" value="60000" />
 
    <!-- 配置间隔多久才进行一次检测，检测须要关闭的空闲链接，单位是毫秒 -->
    <property name="timeBetweenEvictionRunsMillis" value="60000" />
 
    <!-- 配置一个链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，而且指定每一个链接上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没法统计 -->
    <property name="filters" value="stat" /> 
</bean>

目前这样的配置已经可以使用链接池，注意不要忘记了jar文件，下载地址：http://code.alibabatech.com/mvn/releases/com/alibaba/druid/

而后是监控的配置：

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能够监控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>

该配置能够访问监控界面

配置好后访问

http://ip：port/projectName/druid/index.html

具体和项目集成实例：

1、相关JAR包

因为是基于Maven的项目，找起JAR包天然就方便了许多，咱们只须要知道JAR的名字或者其中关键字就能够很轻松的把JAR包以及依赖JAR下载下来，须要多少下多少。

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>

因为Maven会把JAR包所依赖的JAR包也一块儿下载下来，这里咱们就不须要逐个去写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，因此额外的多引入了一个Druid的JAR包。

关于JAR的扩展，若是有须要别的能够到：http://search.maven.org/ 去查找，而后复制到这个配置文件便可，Maven会帮咱们自动下载添加。

 

2、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